Iceland cross-border tax screening

Who this applies to

For 2026 workpapers involving Iceland and another jurisdiction, establish domestic status, classify the income, then apply the actual treaty and collection procedure. Overseas addresses, foreign employers and the absence of an Icelandic subsidiary do not settle those questions. [Income Tax Act 90/2003, Articles 1–3a][law]

Individuals. Article 1(1) includes Icelandic domicile (point 1) and stays longer than 183 days in total in any twelve-month period, counting ordinary holiday absences (point 3). Point 4 separately covers work of more than 183 days aboard Iceland-registered ships and aircraft. Check domicile independently from a rolling-period presence schedule. The tax authority decides residence disputes under Article 1(2), with appeal to the Tax Appeals Board. [Article 1][law]

Residence wording on the authority's English page: the statute's test is "longer than 183 days in total". The authority's English page summarises it as a stay of "six months or longer". The statute prevails: a stay of exactly 183 days does not meet point 3, and a calendar-month count does not replace the day count. Domicile under point 1 is still tested separately. [Article 1][law]; [English guidance][residence]

Former domiciliaries who leave and terminate Icelandic domicile remain within Article 1(1), point 2, unless they prove ordinary residence-equivalent foreign tax liability and fulfilment of those obligations. The period is three years from the next New Year after departure, rather than simply from the departure date. Retain foreign residence certificates, returns, assessments and payment evidence. Treaty residence is a separate question. [Article 1(1), point 2][law]

Entities. Article 2 uses Icelandic registration, constitutional domicile or actual management. Check legal form and separate-taxpayer status, including partnership conditions/elections. Foreign incorporation does not rule out Icelandic actual management. [Article 2][law]

For persons outside Articles 1–2, Article 3 identifies employment, Icelandic-payer remuneration/pensions, services performed in Iceland, PE profit, property, rights, shares and interest categories. Article 3(2) expressly says the activity location does not matter for its remuneration/pension category; Article 3(3) instead concerns services performed in Iceland. [Article 3][law]

Rates, bands and thresholds

These are 2026 national statutory rates before exclusions or relief, not a universal final liability or cash-payment instruction. Establish the legal recipient, source category, collection regime and treaty first.

Category or test	Rule	Official source
Article 3(2) remuneration, board fees and pensions from Icelandic payers	20% of the individual's tax base; pensioners use the Article 66 bands with personal credit instead	[Article 70(2)][law]
Article 3(3) service payments to individuals	20% of the payment, including performers' fees and benefits	[Article 70(3)(a)][law]
Article 3(3) service payments to legal entities	20% of payment for legal entities corresponding to Article 2(1)(1)–(2); 37.6% for other legal entities	[Article 70(3)(b)–(c)][law]
Non-resident PE taxable income	20% for Article 2(1)(1)–(2)-type legal entities; 37.6% for other legal entities	[Article 70(4)(b)–(c)][law]
Article 3(6) rights/royalty income	22% national rate	[Article 70(6)][law]
Legal entity's Article 3(7) share/dividend income	20%, before applicable relief	[Article 70(7)(b)][law]
Legal entity's taxable interest	12%; check Article 3(8) exclusions first	[Article 70(8)(b)][law]
Domestic construction/installation PE duration	Longer than six months; other domestic and treaty tests also require review	[Article 3a(2)][law]
Qualifying company migration payment deferral	Up to five calendar years; annual principal at least one fifth of original deferred sum; 1 November due, final fifteen days later	[Articles 51(5)–(6), 56a][law]
Migration security/report screens	Deferred amount above ISK 50 million, unless the treaty information-access exception applies; collection-assistance test can require security at any amount; report before 1 October	[Article 51(7)][law]
Individual resident-like treatment screen	Qualifying EEA/EFTA/Faroe residence and at least 75% of total annual income from Iceland; further requirements apply	[Article 70a(1)–(2)][law]
Joint filing for EEA/EFTA/Faroe couples	Income from Iceland at least 90% of the couple's combined income, and registered at the same address at year end	[Article 70a(3)][law]
2026 average municipal tax (útsvar)	14.94%; each municipality sets its own rate, and an Article 3 person pays to the municipality where most income was earned	Notice 1521/2025; [Municipal Revenue Act 4/1995, Articles 19–21][municipal]

The dividend and interest guidance identifies 21% and 13% as 2024 exceptions. Do not import them into 2026. [Dividend guidance][dividends]; [Interest guidance][interest]

Published 2026 monthly employment withholding uses 31.49% through ISK 498,122, 37.99% for the next band through ISK 1,398,450, and 46.29% above it; monthly credit is ISK 72,492. These payroll figures do not determine every non-resident final assessment or payment's municipal tax. Use the income-tax skill alongside Articles 69–70's partial-year and limited-liability rules. [2026 rates][rates]; [Articles 69–70][law]

The base

Payment classification workpaper

Payment	Establish before calculating	Source
Employment/remuneration	Employer, payer, work location, board role, pension status and period. Article 70(1) refers short-stay employment to Article 69(2)'s annualisation; other remuneration and pensions have different rules.	[Articles 3, 69–70][law]
Services/activity	Actual performance and location, recipient legal form and treaty restrictions. Domestic Article 3(3) service-source taxation does not require a PE first.	[Articles 3(3), 70(3)][law]
Rights/royalties	What rights are granted, licence terms and deliverables. The authority includes computer programs, specialised knowledge and overseas-hosted accounting systems. Offshore performance alone does not resolve a rights payment's treatment.	[Article 3(6)][law]; [Royalty guidance][royalties]
Dividends	Recipient, residence, entitlement and distribution decision. Review treaty relief and the separate return-based EEA limited-company refund conditions before asserting zero tax.	[Article 70(7)][law]; [Dividend guidance][dividends]
Interest	Principal, paid/accrued interest, issuer, instrument and recipient. Article 3(8) contains specified public-body and debt exclusions; 12% is not a conclusion that every instrument is taxable.	[Articles 3(8), 70(8)][law]

Article 3(8) excludes interest paid by the Central Bank of Iceland in its own name or on behalf of the Treasury (wording added by Act 53/2014). The authority's English interest page still says Central Bank issues on behalf of the Treasury are not exempt; that page is out of date and the statute prevails. Article 3(8) also excludes interest paid to foreign states, international organisations and tax-exempt public bodies, and interest on the specified registered bank and energy-company bonds. Apply the statute to the particular instrument and keep the registration/exclusion evidence. [Article 3(8)][law]; [Interest guidance][interest]

Keep tax-base calculation, withholding/remittance and final assessment in separate columns. Act 45/1987 expressly covers specified non-resident receipts; Act 94/1996 has a separate capital-income collection scope. Do not substitute an individual's domestic 22% capital-tax headline for all foreign-company payments. [Act 45/1987, Articles 2, 4, 9][withholding]; [Act 94/1996, Articles 1–3][capital-withholding]

Permanent establishments

Article 3a starts with a fixed place through which business is wholly or partly carried on. Its preparatory/support exclusions require consideration of integrated activities across closely connected enterprises. A non-independent agent with contracting authority, or habitually playing the principal role leading to contracts without material change, also requires assessment. Subsidiary ownership alone does not establish the parent's PE. [Article 3a][law]

Prepare premises, project-duration, people and contract-negotiation timelines, then apply Regulation 1165/2016, Articles 2–8 with current Article 3a:

• Fixed place: identify the actual premises, land, site, machinery or equipment, location/permanence and business carried on through it. A branch-registration label alone does not replace the facts.
• Preparatory/auxiliary: test the activity against the enterprise's main business. Combine complementary activities of closely connected enterprises where the anti-fragmentation rule applies; a storage or server label is not an automatic exclusion.
• Construction/installation: the domestic test is longer than six months from project start to completion, including interruptions regardless of cause. Combine commercially/geographically connected contracts and relevant closely connected-enterprise work under Article 5; splitting contracts or subcontracting within the group does not restart the clock.
• Agents: examine the actual negotiating/contracting role, assets/rights/services covered and dependence. Exclusively or almost exclusively acting for closely connected enterprises can defeat the independent-agent exclusion. An overseas signature does not by itself prevent an Icelandic PE.
• Home office: Article 8's domestic exclusion requires all four conditions: ordinary workplace abroad; the employee sets up the home work area without the employer's involvement; no employer access/control of it; and work delivered entirely electronically for the employer's foreign business. Document each one. Failure of a condition removes that exclusion but does not alone prove every other PE condition.

Regulation 1165/2016, Articles 2–8

Then compare the domestic result with the actual treaty's PE article and effective modifications. Treaty protection, residence and eligibility must be established, not inferred from incorporation abroad. If a PE is taxable, prepare its revenue, attributable expenses, asset and head-office transaction schedules under the applicable income-tax/treaty rules, with the transfer-pricing skill for branch dealings. Disputed attribution and treaty-specific project thresholds require their own supported analysis. The regulation reproduction states that the official Gazette prevails where texts differ.

Partial-year and short-stay employment assessment

Income Tax Act Article 69(2) annualises an eligible part-year resident's tax base by dividing by Icelandic stay days and multiplying by 365, computes annual state income tax and the Article 67 credit, then prorates the result by stay days/365. Article 70(1) applies this method to the Article 3(1) nonresident employment category. It is not the computation for every director, performer, service fee or pension. Preserve the category and day-count workpaper first. [Articles 69–70][law]

Use the actual annual 2026 state bands, not twelve times rounded monthly ceilings: 16.55% through 5,977,470; 23.05% through 16,781,397; 31.35% above that; annual credit 869,898. Municipal tax has its own rate and allocation (the 2026 average is 14.94%; the Article 3 person pays to the municipality where most income was earned); show it separately and deal with any unused credit under the applicable rules. The example below has positive state tax after credit, so it does not resolve an unused-credit branch. 2026 Gazette notice 1521/2025, [Income Tax Act Articles 66–70][law], Municipal Revenue Act 4/1995, Articles 20–23

Reconcile actual withholding as payment against the assessment calculation. Withholding bands or net payslips alone do not prove a final assessment. Treaty exemption, residence, municipality, days, foreign income relevant to an elected regime and credit entitlement remain evidence inputs.

Deadlines and filing

Treaty relief. For the Article 3(3), (6), (7) and (8) payments addressed in the authority's procedure, prepare RSK 5.42, foreign-authority residence/full-tax-liability confirmation and complete recipient/transaction details. Skatturinn confirms approval with a unique certificate number (box 20). The payer needs the confirmed certificate; a treaty table or unapproved application is insufficient. Once approved, the exemption or reduced rate applies from the date Skatturinn received the application; it does not apply to payments made before that date. Until approval, tax is withheld at the domestic rate. [Exemption procedure][exemption]

For tax already withheld above the treaty rate, the refund application is RSK 5.43, made once the withheld tax has been paid over to the Treasury. A non-resident limited company resident in an EEA state that received a dividend from an Icelandic limited company claims a full refund of the withheld tax by filing the return RSK 1.04; the refund follows the company assessment at the end of October of the following year. Preserve that evidence with the residence and treaty analysis. [Dividend guidance][dividends]

Payer controls. For amounts collected under Act 45/1987, Article 20 requires monthly remittance and an itemised statement for the previous month. Its ordinary due date is the first of the following month and final payment date fourteen days later. Check the applicable calendar; do not transfer this deadline to every capital payment. Article 22 addresses responsibility for amounts withheld or required to be withheld. [Articles 20, 22][withholding]

Annual returns are separate. Tax-year 2026 income is reported on the return filed in 2027; a return or assessment issued in 2026 concerns 2025 income. This skill does not set the 2027 return deadlines; use the income-tax and corporate income-tax skills for them. Article 112 also contains a pre-departure settlement rule for specified foreign nationals/stateless persons on time-limited permits. Review those facts before assuming monthly deductions complete departure obligations. [Articles 90, 112][law]

Penalties and interest

Act 45/1987 Article 28 charges 1% per day after the final payment date, capped at 10%, for unpaid amounts under that regime. If unpaid within a month from the due date, late interest runs from the due date under the provision. The authority can waive the surcharge for accepted reasons. These collection rules are not automatically the rules for every annual assessment or capital-income payment. [Article 28][withholding]

Income Tax Act Article 108 sets the return surcharges: up to 15% on estimated bases where no return is filed in time; where a late return arrives before the assessment is completed, 0.5% of the bases per day late, capped at 10%; 25% on omitted or wrongly stated items, reduced to at most 15% if corrected before the assessment. The surcharge is cancelled if the taxpayer shows the failure was not their fault or was caused by events beyond their control. Article 114 charges late interest on tax not paid within a month of its due date, at the rate the Central Bank sets under Act 38/2001, Article 6. No floating interest rate is quoted here; take it from the Central Bank's publication for the actual period. [Articles 108, 114][law]

Cross-border points

Retain the exact treaty, effective dates, recipient residence, income article, entitlement/ownership conditions, PE connection, anti-abuse provisions and relevant MLI changes. Domestic residence, treaty residence and permission to reduce withholding are separate decisions. Find the treaty via the [authority's treaty page][treaties]; this skill sets no corridor-specific exemption.

Resident foreign-income relief workpaper

Prepare a separate schedule for each country, income category, taxpayer and year. The applicable treaty controls whether the other country may tax and whether Iceland uses a credit, an exemption or another specified reduction. Do not apply an old treaty or a rate table without its effective-date and entitlement checks. Domestic non-resident exemption applications and an Iceland resident's foreign-tax relief are different procedures. [Income Tax Act, Article 119][law], authority treaty guidance

Build and retain:

1. The gross foreign income, direct expenses, legal source and Icelandic tax base; reconcile the net bank receipt plus foreign withholding to the gross amount. Keep source-currency and ISK conversions, dates and evidence.
2. Treaty version, residence/covered-person evidence, tax covered, income article, foreign taxing right, PE/ownership conditions and anti-abuse analysis. A withholding receipt proves payment, not treaty entitlement to tax it.
3. Foreign assessment/withholding certificates, actual tax paid, refunds or claims, and their match to the same taxpayer, income and period. Separate tax from interest, penalties and unrelated levies before assessing credit eligibility.
4. Icelandic tax computed before relief and the portion attributable to the treaty-eligible foreign income. Allocate expenses and losses before applying the ceiling; gross receipts are not automatically the foreign profit base. Keep the country/category limitation visible instead of pooling excess foreign tax against unrelated Icelandic income.
5. The treaty-specific reduction, supported claim and reconciliation to the filed return/assessment. Track later foreign refunds and changed assessments for any necessary Icelandic correction. Do not treat an unfiled workpaper or an unapproved discretionary request as relief already granted.

The per-country control is supported by Tax Appeals Board decision 520/2012, which rejected the taxpayer's requested unrestricted overall offset. That decision concerns older years and rates; its historical 15% figure is not a 2026 corporate rate.

No treaty. Article 119 permits an application to reduce Icelandic income tax with regard to foreign tax paid on income taxable in Iceland. It does not prescribe an automatic unrestricted refund. The same historical decision upheld limiting relief and rejected a more favourable unrestricted offset. Municipal Revenue Act Article 34 separately permits an application by an individual liable under Article 19, where no applicable municipal double-tax agreement exists and the individual has paid foreign municipal tax to a public body on income also municipally taxable in Iceland. A foreign national income-tax payment alone does not establish that municipal condition. Keep the foreign tax's legal character, public collector, payment and matching income in the evidence file; the authority's discretionary reduction is not automatic municipal credit from an income-tax request. Identify the current legal basis, evidence and authority decision for each actual charge. Municipal Revenue Act, Article 34; [Article 119][law], decision 520/2012

Current UK treaty credit illustration

For Iceland-resident income which the UK may tax under the current Convention, Article 21(1)(a)–(b) credits qualifying UK income tax paid up to Icelandic tax attributable to that income. Article 21(1)(c) separately addresses income taxable only in the UK. Establish which branch applies before using the example. Current Convention/MLI text

Use the 2013 Convention with applicable MLI modifications for 2026. The official publication confirms its current status and effective periods; an older UK treaty PDF remains searchable and uses different article numbering and relief. The authentic Convention and MLI prevail over the synthesised reading aid. Official treaty publication

The example below assumes a single Iceland-resident company, UK-source taxable profit within established UK taxing rights, matched paid UK income tax, no domestic exemption, no other adjustments and a supported proportional Icelandic tax attribution. It does not determine UK liability or extend this mechanism to every treaty.

Resident individual: progressive earned-income credit ceiling

First establish a full-year Iceland-resident adult, the treaty residence/covered-person position, the foreign country's taxing right over the particular earned income, actual qualifying foreign income tax paid and the applicable relief branch. Use the actual treaty, not a generic exemption assumption. The current UK Convention includes both state income tax and municipal income tax as covered Icelandic taxes. Its Article 21(1)(a)–(b) is the paid-tax credit branch; UK-only income under (c) is a different branch. The method below assumes one foreign country/category, a positive state-tax amount after personal credit and supported comparable earned-income bases. UK Convention, Articles 2 and 21

The authority's 2026 return handbook, page 20, reports 2025 income. It demonstrates proportional relief by computing tax on combined domestic/foreign earned income after personal credit, then reducing state tax and municipal tax by the foreign-income share. Its credit-method paragraph limits relief to matched paid foreign tax if that is lower than attributable Icelandic tax. This establishes the stated method; its old-year thresholds, exchange rate and personal credit are not 2026 income-year parameters. [Official handbook, page 20][individual-handbook]

Prepare the following workpaper for the stated positive-tax case:

1. Reconcile domestic and foreign taxable earned-income bases after supported deductions, rather than net foreign bank receipts. Attribute deductions consistently; record currency conversions and any mismatch between the foreign assessment and Icelandic base. Keep separately taxed capital income outside this simplified same-category example.
2. Compute annual state tax on the combined base using the 2026 annual bands and subtract the supported annual personal credit once. Compute municipal tax with the client's own municipality's rate; the example uses 14.94%, the 2026 average set out in notice 1521/2025, as the assumed case rate. Preserve the state/municipal columns.
3. Compute the eligible foreign base divided by the combined comparable base. Allocate the after-personal-credit state tax and municipal tax by that ratio to establish the attributable ceiling for this supported case. Do not instead charge only domestic income, assign all foreign income to the highest marginal band, or subtract full personal credit again after relief.
4. Under the established credit branch, limit the total reduction to the lower of qualifying paid foreign tax and that attributable covered-tax ceiling. Reconcile the state/municipal allocation to the actual assessment; do not deduct the whole foreign tax separately from both charges. Actual Icelandic withholding is a separate payment credit after the tax calculation.
5. Retain the treaty analysis, proof of payment/refunds, income/deduction/currency schedule, allocation and submitted claim/assessment. Later foreign refunds or reassessments need reconsideration. An excess above the ceiling has no automatic Icelandic refund or carryforward established by this method.

[Income Tax Act, Articles 66–67 and 119][law]; 2026 annual notice; [Handbook, page 20][individual-handbook]; UK Convention, Article 21

This does not settle several foreign countries/categories, foreign-source losses, mixed capital income, spouse transfers, unused personal credit, part-year/Article 70a elections or contested attribution/foreign taxing rights. Resolve those inputs under their own law before extending the simple proportional workpaper. For exemption-with-progression, use the treaty's actual exemption clause and computation rather than capping relief at foreign tax paid merely because this credit example does so.

Company/asset migration and deemed realisation

Article 56a addresses a qualifying company's residence or asset move to another EEA state, an EFTA Convention state or the Faroe Islands, where company law permits it. A low-tax destination requires sufficient evidence of genuine business under Article 57a. Article 51(9) also requires the treaty/international-agreement authority to obtain necessary information; prove that condition before invoking this regime. Its reference to Article 51(3)–(9) imports the computation and payment rules below; the opening language does not exempt all unrealised gains. Splits and sole-trader incorporation have their own qualifying conditions under Articles 52 and 56. [Articles 51–56a][law]

Valuation workpaper. Fix the relevant closing date and obtain expert market valuations certified by the company's licensed auditors. List operating assets, shares, intangibles, other assets and eligible liabilities; reconcile market values to tax bases after prior depreciation. Article 51 permits excluding assets retained in Iceland that could belong to the merged company's registered Icelandic PE. Evidence that retained property meets that condition is required. Liabilities must satisfy Article 75; book pension or deferred-income-tax provisions are not automatically allowable liabilities. [Article 51(3)–(4)][law]

For mergers, RSK 4.27 provides two controls: fair-value net assets less tax net assets, and the sum of category differences. Reconcile both to the same base, then apply the company's applicable Article 71 rate. Keep valuation and tax-basis adjustments separate from book equity. The form is dated 31 August 2021 and appears in Skatturinn's 2026 forms list as "Ákvörðun skattstofns við millilandasamruna". Its instructions treat pension and income-tax provisions as liabilities that do not meet Article 75. For an Article 56a move, also file the report in the form the tax authority sets under Article 51(3). RSK 4.27; [2026 forms list][forms]

Assessment and payment. For Article 51's confirmed cross-border merger, the statutory assessment period is within two months of confirmation notified to the company registry, with payment due ten days later. Apply the incorporated rule to the actual Article 56a transaction with professional/authority confirmation of the event and date. Do not substitute the ordinary annual corporate-return deadline. [Article 51(4), Article 56a(2)][law]

Requested deferral. Article 51 permits deferring the due tax principal for up to five calendar years. It bears the Central Bank's published ordinary non-indexed claim interest through payment; the request requires the earlier returns and the relevant current-year part-period return. Annual principal payment after the merger must be at least one fifth of the original deferred amount, due 1 November with a final due date fifteen days later. Ordinary late interest applies if unpaid at the final date. This is interest-bearing collection relief, not cancellation of the taxable gain. [Article 51(5)–(6)][law]

Security and continuing reports. Article 51(7) requires bank security above 50 million, subject to its information-access exception. It separately requires security regardless of amount where the destination lacks the specified collection-assistance agreement. Information access and collection assistance are different treaty checks. Retain the security decision covering principal, interest and costs. The receiving company must provide annual accounts and the required transferred-asset report before 1 October while deferral continues. Missing the report makes the deferred amount due from the next due date; moving assets/rights/obligations outside the qualifying area also ends deferral from the next due date. [Article 51(5)–(9)][law]

For a company retaining Icelandic residence but moving assets, Article 56a places the transfer-tax liability on the Icelandic transferor. Incoming mergers also need the Article 51(8) basis rule: a foreign market-value uplift is not automatically an Icelandic step-up without proof of the corresponding foreign tax settlement. Keep the transaction documents, continuing PE records, valuation and basis register, returns, assessment, deferral/security decision, annual reports and payment/interest ledger together. [Articles 51 and 56a][law]

Remaining boundary: ordinary individual departure, transactions outside the qualifying regime, disputed valuations, losses and treaty-specific outcomes need their own supported calculation. This workpaper does not establish universal exit-tax treatment for every person or destination.

For actual or prospective double taxation, prepare a treaty MAP screen with years, adjustments and domestic proceedings. Agreement is not guaranteed. Check the treaty's deadline and preserve domestic remedy deadlines separately. [MAP guidance][map]

Worked examples that recompute

1. Service versus royalty

Assume a reviewer establishes that an Article 2(1)(1)-type non-resident limited company receives ISK 1 million for Iceland-performed services with no relief: national tax under Article 70(3)(b) is ISK 200,000. A separate ISK 1 million payment established as an Article 3(6) royalty gives ISK 220,000 under Article 70(6). The difference is ISK 20,000. This does not establish classification, treaty treatment or a final payment instruction.

name: Iceland service and royalty national tax comparison
inputs:
  service_payment: 1000000
  royalty_payment: 1000000
  service_rate: 0.20
  royalty_rate: 0.22
steps:
  service_tax: service_payment * service_rate
  royalty_tax: royalty_payment * royalty_rate
  difference: royalty_tax - service_tax
expected:
  service_tax: 200000
  royalty_tax: 220000
  difference: 20000

2. Resident-like treatment income ratio

Assume qualifying EEA/EFTA/Faroe residence and ISK 9 million Iceland income plus ISK 3 million other income on the proper Article 70a measurement basis. Iceland's share is 75%, satisfying the “not less than 75%” income test. Check the other conditions and relevant spouse/income evidence; this calculation does not establish domestic or treaty residence. [Article 70a][law]

name: Iceland Article 70a income ratio boundary
inputs:
  iceland_income: 9000000
  other_income: 3000000
  required_share: 0.75
steps:
  total_income: iceland_income + other_income
  iceland_share: iceland_income / total_income
  margin: iceland_share - required_share
expected:
  total_income: 12000000
  iceland_share: 0.75
  margin: 0

3. Late-remittance cap

Assume unpaid Act 45/1987 withholding of ISK 200,000, twelve chargeable late days and no waiver. The 12% uncapped percentage is limited to 10%, producing a ISK 20,000 surcharge. Interest requires separate dates and rate. [Article 28][withholding]

name: Iceland public levy withholding surcharge cap
inputs:
  unpaid: 200000
  late_days: 12
  daily_rate: 0.01
  cap: 0.10
steps:
  uncapped_rate: late_days * daily_rate
  surcharge_rate: min(uncapped_rate, cap)
  surcharge: unpaid * surcharge_rate
expected:
  uncapped_rate: 0.12
  surcharge_rate: 0.10
  surcharge: 20000

4. Qualifying migration, retained PE and deferred principal

Assume the statutory conditions and registered Icelandic PE exclusion are established. An asset moved out has market value 200 million and adjusted tax basis 120 million; another asset with market value 100 million and basis 70 million remains within the qualifying registered Icelandic PE and is excluded. No liability, other gain/loss, loss-relief or valuation adjustment applies. At an established 20% company rate, exit base is 80 million and tax 16 million, not 22 million on both assets. If the authority grants deferral of that whole principal, annual principal must be at least 3.2 million; separately add the applicable interest. [Articles 51(3)–(7), 56a and 71][law]

name: Iceland qualifying company migration with retained registered PE
inputs:
  moved_market_value: 200000000
  moved_adjusted_tax_basis: 120000000
  retained_pe_market_value: 100000000
  retained_pe_adjusted_basis: 70000000
  established_company_rate: 0.20
steps:
  - moved_gain: moved_market_value - moved_adjusted_tax_basis
  - excluded_pe_difference: retained_pe_market_value - retained_pe_adjusted_basis
  - migration_base: moved_gain
  - assessed_tax: migration_base * established_company_rate
  - minimum_annual_principal: assessed_tax / 5
expected:
  moved_gain: 80000000
  excluded_pe_difference: 30000000
  migration_base: 80000000
  assessed_tax: 16000000
  minimum_annual_principal: 3200000

This block establishes neither eligibility for deferral nor the security result. Even below 50 million, missing collection assistance can require security. Annual reports, interest and acceleration conditions still apply.

5. Resident company foreign-tax-credit ceiling

Assume Icelandic taxable profit of 4 million from domestic operations and 1 million attributable to an established UK PE, all within an ordinary 20% Icelandic computation. Qualifying UK income tax actually paid is an assumed 250,000. Icelandic tax before relief is 1 million, attributable UK tax ceiling 200,000, credit 200,000, remaining Icelandic tax 800,000. The 50,000 excess does not erase tax on domestic income; no carryforward or cash-refund right is established. If the supported UK tax paid were instead 100,000, credit would be 100,000 and remaining Icelandic tax 900,000. [Article 71][law], UK Convention Article 21(1)

name: Iceland resident company UK credit bounded by matched foreign income
inputs:
  domestic_taxable_profit: 4000000
  uk_taxable_profit_under_iceland_rules: 1000000
  established_iceland_company_rate: 0.20
  qualifying_uk_tax_paid: 250000
  alternative_lower_uk_tax: 100000
steps:
  - total_taxable_profit: domestic_taxable_profit + uk_taxable_profit_under_iceland_rules
  - iceland_tax_before_relief: total_taxable_profit * established_iceland_company_rate
  - attributable_uk_ceiling: iceland_tax_before_relief * uk_taxable_profit_under_iceland_rules / total_taxable_profit
  - credit: min(qualifying_uk_tax_paid, attributable_uk_ceiling)
  - remaining_iceland_tax: iceland_tax_before_relief - credit
  - uncredited_excess: qualifying_uk_tax_paid - credit
  - alternative_credit: min(alternative_lower_uk_tax, attributable_uk_ceiling)
  - alternative_remaining_tax: iceland_tax_before_relief - alternative_credit
expected:
  iceland_tax_before_relief: 1000000
  attributable_uk_ceiling: 200000
  credit: 200000
  remaining_iceland_tax: 800000
  uncredited_excess: 50000
  alternative_credit: 100000
  alternative_remaining_tax: 900000

6. Eligible short-stay employment, annualised state tax

Assume an adult in the Article 70(1) employment category, 100 supported stay days in 2026, taxable income after allowed deductions of 2 million, no treaty exemption or other adjustment, and an established applicable municipal rate of 14.94%. Annualised state-tax base is 7.3 million. State tax before annual credit is 1,294,114.45, annual state tax after credit 424,216.45, and prorated state tax 116,223.68. Municipal tax on the stated period base is 298,800, giving 415,023.68 before actual payment credits. The 14.94% is the 2026 average municipal rate; use the rate of the municipality where the person earned most income (Municipal Revenue Act Article 20). [Articles 66–70][law], Gazette notice 1521/2025

name: Iceland qualifying short-stay employment annualisation, positive state tax
inputs:
  period_taxable_income: 2000000
  established_stay_days: 100
  first_annual_ceiling: 5977470
  second_annual_ceiling: 16781397
  annual_credit: 869898
  established_municipal_rate: 0.1494
steps:
  - annualised_base: period_taxable_income * 365 / established_stay_days
  - state_band_one: min(annualised_base, first_annual_ceiling) * 0.1655
  - state_band_two: max(0, min(annualised_base, second_annual_ceiling) - first_annual_ceiling) * 0.2305
  - state_band_three: max(0, annualised_base - second_annual_ceiling) * 0.3135
  - annual_state_before_credit: state_band_one + state_band_two + state_band_three
  - annual_state_after_credit: max(0, annual_state_before_credit - annual_credit)
  - period_state_tax: annual_state_after_credit * established_stay_days / 365
  - municipal_tax: period_taxable_income * established_municipal_rate
  - period_tax_before_payments: period_state_tax + municipal_tax
expected:
  annualised_base: 7300000
  annual_state_before_credit: 1294114.45
  annual_state_after_credit: 424216.45
  period_state_tax: 116223.68
  municipal_tax: 298800
  period_tax_before_payments: 415023.68

7. Full-year individual: progressive tax, proportional ceiling and paid-tax cap

Assume a full-year adult treaty resident of Iceland has 12 million domestic and 8 million UK taxable earned income, after all permitted deductions. The UK income is proved taxable in the UK under the current treaty, the Article 21(1)(a)–(b) credit branch applies, qualifying UK income tax paid is an invented 3 million, full annual personal credit is supported, and the established municipal rate is 14.94% throughout. There is no capital income, spouse transfer, other country, loss, unused-credit issue or other adjustment.

On the 20-million combined base, 2026 state tax before personal credit is 4,488,608.499; after the 869,898 credit it is 3,618,710.499. Municipal tax is 2,988,000, so tax before foreign relief is 6,606,710.499. The foreign-income share is 40%, giving an attributable ceiling of 2,642,684.1996. The 3-million paid foreign tax is capped at that amount; Icelandic tax after relief is 3,964,026.2994, before withholding/payment credits and the accepted filing rounding. The uncredited excess is 357,315.8004. If qualifying paid UK tax were instead 1.5 million, the credit would be 1.5 million and remaining Icelandic tax 5,106,710.499. Neither result is computed by removing the foreign income before applying the bands or using its highest marginal rate. Keep unrounded workpaper figures and reconcile the authority's final rounding/allocation before filing. 2026 annual notice; [Handbook, page 20][individual-handbook]; UK Convention, Articles 2 and 21

name: Iceland full year individual UK credit uses progressive after credit proportional ceiling
inputs:
  domestic_taxable_earned_income: 12000000
  uk_taxable_earned_income: 8000000
  first_annual_ceiling: 5977470
  second_annual_ceiling: 16781397
  supported_annual_personal_credit: 869898
  supported_municipal_rate: 0.1494
  qualifying_uk_income_tax_paid: 3000000
  alternative_lower_paid_uk_tax: 1500000
steps:
  - combined_taxable_base: domestic_taxable_earned_income + uk_taxable_earned_income
  - first_state_band_tax: min(combined_taxable_base, first_annual_ceiling) * 0.1655
  - second_state_band_tax: max(0, min(combined_taxable_base, second_annual_ceiling) - first_annual_ceiling) * 0.2305
  - third_state_band_tax: max(0, combined_taxable_base - second_annual_ceiling) * 0.3135
  - state_tax_before_personal_credit: first_state_band_tax + second_state_band_tax + third_state_band_tax
  - state_tax_after_personal_credit: state_tax_before_personal_credit - supported_annual_personal_credit
  - municipal_tax: combined_taxable_base * supported_municipal_rate
  - tax_before_foreign_relief: state_tax_after_personal_credit + municipal_tax
  - foreign_income_ratio: uk_taxable_earned_income / combined_taxable_base
  - attributable_state_tax: state_tax_after_personal_credit * foreign_income_ratio
  - attributable_municipal_tax: municipal_tax * foreign_income_ratio
  - attributable_ceiling: attributable_state_tax + attributable_municipal_tax
  - credit: min(qualifying_uk_income_tax_paid, attributable_ceiling)
  - remaining_iceland_tax: tax_before_foreign_relief - credit
  - uncredited_excess: qualifying_uk_income_tax_paid - credit
  - lower_paid_tax_credit: min(alternative_lower_paid_uk_tax, attributable_ceiling)
  - lower_paid_case_remaining_tax: tax_before_foreign_relief - lower_paid_tax_credit
expected:
  combined_taxable_base: 20000000
  state_tax_before_personal_credit: 4488608.499
  state_tax_after_personal_credit: 3618710.499
  municipal_tax: 2988000
  tax_before_foreign_relief: 6606710.499
  foreign_income_ratio: 0.4
  attributable_state_tax: 1447484.1996
  attributable_municipal_tax: 1195200
  attributable_ceiling: 2642684.1996
  credit: 2642684.1996
  remaining_iceland_tax: 3964026.2994
  uncredited_excess: 357315.8004
  lower_paid_tax_credit: 1500000
  lower_paid_case_remaining_tax: 5106710.499

Ask the client first

• What are the individual's domicile, rolling presence/absence dates, departure and foreign-tax evidence, or the entity's registration, legal form and actual management?
• What does each contract supply, where is performance, what rights are granted and who is entitled to payment?
• What premises, projects, people, agents, connected enterprises and contract-negotiation activities exist in Iceland?
• What treaty, year, residence certificates, exemption approvals, returns and refund claims apply?
• What gross amounts, withholding, remittances, foreign assessments and payments reconcile to the accounts?
• Is there a move, asset transfer, foreign adjustment, dispute or approaching payment/appeal deadline?

Contributed by Michael Cutajar.