pt-social-contributions

Portugal Social Contributions -- Self-Employed Skill v2.0

Verified rates & thresholds (accountant-reviewed)

Reviewed against the cited tax authorities by Mário Jorge da costa Vale on 2026-06-04. Items flagged for further clarification are tracked separately and excluded here. This block is generated from verified skill_facts — edit the facts, not the prose.

Segurança Social

• Trabalhador independente — 21,4% (Código Contributivo Art. 163)
• Empresário em nome individual — 25,2% (Código Contributivo)
• Rendimento relevante — serviços — 70% do bruto (Código Contributivo Art. 162)
• Rendimento relevante — bens — 20% do bruto (Código Contributivo Art. 162)
• Base mínima mensal (IAS) — €522,50 (Portaria n.º 6-B/2025/1, de 6 de janeiro)
• Base máxima mensal (12×IAS) — €6.270,00 (Código Contributivo Art.º 163º, nº 5)
• Primeiros 12 meses — Isento de contribuições (Código Contributivo)
• Emprego concorrente (< 4×IAS) — Isento se rendimento relevante < 4 x IAS/mês (em 2025 4 x 522,50 = €2.090) (Código Contributivo Art.º 157º, nº 1, a))
• Declaração trimestral — Janeiro (out-dez), abril (jan-mar), julho (abr-jun), outubro (jul-set) (Código Contributivo)
• Pagamento mensal — Entre 10 e 20 do mês (Código Contributivo)
• Dedutibilidade fiscal — SIM — dedutíveis do IRS (CIRS)

Section 1 -- Quick reference

Quick reference

Field	Value
Country	Portugal (Portuguese Republic)
Authority	ISS (Instituto da Segurança Social) for contributions; AT (Autoridade Tributária) for tax
Primary legislation	Código Contributivo (Lei n.o 110/2009, art. 139-170)
Supporting legislation	Decreto Regulamentar 1-A/2011; annual updates via Portaria
Self-employed rate	21.4%
Empresário em nome individual rate	25.2%
Relevant income -- services	70% of gross
Relevant income -- goods	20% of gross
Minimum monthly base (IAS, 2025)	EUR 480.43
Maximum monthly base (12x IAS)	EUR 5,765.16
First 12 months	Exempt from contributions
Declaration frequency	Quarterly
Payment frequency	Monthly (between 10th and 20th)
Currency	EUR only
Contributor	Open Accountants
Validated by	Verified by Mário Jorge da costa Vale (CA - 85883) on 2026-06-04
Validation date	Verified by Mário Jorge da costa Vale (CA - 85883) on 2026-06-04

Section 2 -- Required inputs and refusal catalogue

Required inputs

• Required inputs before computing — Before computing, you MUST obtain: 1. Activity type -- trabalhador independente, empresário em nome individual, or profissional liberal? 2. Gross quarterly income (rendimento relevante) -- from the quarterly declaration 3. Year of activity -- first 12 months exempt from contributions 4. Any concurrent employment? -- reduced rate may apply 5. Category of services -- services (prestação de serviços) vs sales of goods (venda de bens)? 6. Does the client have an accountant (contabilidade organizada)? -- affects relevant income calculation. If income type (services vs goods) is unknown, STOP. The relevant income percentage differs.

Refusal catalogue

• R-PT-SOC-1 -- Cross-border EU worker — Trigger: client is a Portuguese resident providing services in another EU state. Message: "Cross-border social insurance requires A1 certificate analysis under EU Regulation 883/2004. Escalate to qualified adviser."
• R-PT-SOC-2 -- Pensioner reduced rates — Trigger: self-employed pensioner asks about reduced contribution rate. Message: "Pensioner contribution rates require confirmation with ISS. Flag for reviewer."

Prohibitions

• Prohibitions list — NEVER apply 21.4% to gross income directly -- the relevant income percentage (70% for services, 20% for goods) must be applied first. NEVER forget the first 12 months exemption for new self-employed. NEVER ignore the minimum base of EUR 480.43 (IAS) -- even with zero income, this minimum applies after the exemption period. NEVER confuse the self-employed rate (21.4%) with the empresário rate (25.2%). NEVER present quarterly declaration income as the contribution base -- it must be converted to monthly. NEVER forget to clamp at the maximum of 12 x IAS (EUR 5,765.16). NEVER state that contributions are NOT tax-deductible -- they ARE deductible from IRS income. NEVER advise on concurrent employment exemption without verifying the 4 x IAS threshold.

Section 3 -- Relevant income calculation

Legislation: Código Contributivo, art. 162

Without organized accounting (sem contabilidade organizada)

Relevant income percentages without organized accounting

Income type	Relevant income %
Prestação de serviços (services)	70% of gross
Produção e venda de bens (goods)	20% of gross
Mixed (services + goods)	Apply each % to respective category

With organized accounting (com contabilidade organizada)

• Relevant income with organized accounting — Relevant income = actual net profit from accounting records.

Quarterly to monthly conversion

• Quarterly to monthly conversion formula — quarterly_relevant_income = sum of relevant_income for the 3 months in the quarter monthly_relevant_income = quarterly_relevant_income / 3

Section 4 -- Rates, base, and bounds (2025)

Legislation: Código Contributivo, art. 163, 168

Contribution rates

Contribution rates

Category	Rate
Trabalhador independente	21.4%
Empresário em nome individual (with employees)	25.2%

Base bounds

Base bounds

Bound	Amount
Minimum monthly base (IAS)	EUR 480.43
Maximum monthly base (12x IAS)	EUR 5,765.16

• Monthly base clamp formula — monthly_base = clamp(480.43, monthly_relevant_income, 5,765.16)

Section 5 -- Computation steps

Step 5.1 -- Quarterly declaration

Quarterly declaration schedule

Declaration period	Income period covered	Filing deadline
January	Oct--Dec (prior year)	End of January
April	Jan--Mar	End of April
July	Apr--Jun	End of July
October	Jul--Sep	End of October

Step 5.2 -- Calculate monthly relevant income

• Monthly relevant income calculation — IF services_only (sem contabilidade): relevant_income = quarterly_gross x 70% / 3 ELIF goods_only: relevant_income = quarterly_gross x 20% / 3 ELIF mixed: relevant_income = (services_gross x 70% + goods_gross x 20%) / 3 ELIF contabilidade_organizada: relevant_income = quarterly_net_profit / 3

Step 5.3 -- Apply bounds and calculate

• Apply bounds and calculate contribution — monthly_base = max(480.43, min(relevant_income, 5,765.16)) monthly_contribution = monthly_base x 21.4%

Step 5.4 -- Contributions apply for the next quarter

• Contributions apply for next quarter — The quarterly declaration determines contributions for the following 3 months.

Section 6 -- Payment schedule, exemptions, and tax deductibility

Payment schedule

Payment schedule

Obligation	Due date
Monthly contribution payment	Between 10th and 20th of each month
Payment method	Direct debit, ATM, or Segurança Social Direta portal

• Late payment — Late payment: interest at legal rate + potential loss of benefits.

Exemptions

• First 12 months — new self-employed workers are exempt from contributions for the first 12 months of activity.
• Concurrent employment exemption — if the self-employed person also has employment where the employer pays at least the minimum contribution base: If employment income >= IAS: self-employed contributions may be reduced or exempt. If self-employed income >= 4 x IAS (EUR 1,921.72): exemption does NOT apply

Tax deductibility

Tax deductibility

Question	Answer
Are Segurança Social contributions deductible?	YES -- from gross income for IRS purposes
Classification	Category B deductions
When deductible?	In the year they are paid

Section 7 -- Organized accounting and recibos verdes

Self-employed with organized accounting

• Organized accounting net profit rule — Relevant income = actual net profit (not deemed %). If net profit is negative, minimum base still applies. Confirm profit calculation methodology with contabilista. Flag for reviewer.

Recibos verdes (green receipts) income

• Recibos verdes income treatment — This IS self-employed income. Standard 70% relevant income rule applies. All recibos verdes amounts are reported in the quarterly declaration.

Section 8 -- Edge case registry

EC1 -- First year of activity

Situation: Client opened activity in March 2025. Resolution: Exempt from contributions until February 2026 (12 months). First quarterly declaration due in April 2026. Contributions begin from the month following the first declaration.

EC2 -- Services income below minimum

Situation: Client provides services with quarterly gross EUR 1,000. Resolution: Relevant income = EUR 1,000 x 70% / 3 = EUR 233.33/month. Below minimum. Monthly contribution = EUR 480.43 x 21.4% = EUR 102.81.

EC3 -- Very high income

Situation: Client earns EUR 30,000/quarter from services. Resolution: Relevant income = EUR 7,000/month. Capped at EUR 5,765.16. Monthly contribution = EUR 5,765.16 x 21.4% = EUR 1,233.74.

EC4 -- Mixed services and goods

Situation: Client earns EUR 6,000 from services and EUR 15,000 from goods in the quarter. Resolution: Relevant income = (EUR 6,000 x 70% + EUR 15,000 x 20%) / 3 = EUR 2,400/month. Contribution = EUR 2,400 x 21.4% = EUR 513.60.

EC5 -- Concurrent employment, exemption applies

Situation: Client employed at EUR 1,200/month, self-employed quarterly services EUR 2,000. Resolution: Self-employed relevant income = EUR 466.67/month (below 4 x IAS). Employment exemption applies. Contributions = EUR 0.

Section 9 -- Reviewer escalation protocol

When a situation requires reviewer judgement:

REVIEWER FLAG
Tier: T2
Client: [name]
Situation: [description]
Issue: [what is ambiguous]
Options: [possible treatments]
Recommended: [most likely correct treatment and why]
Action Required: Qualified contabilista certificado must confirm before advising client.

When a situation is outside skill scope:

ESCALATION REQUIRED
Tier: T3
Client: [name]
Situation: [description]
Issue: [outside skill scope]
Action Required: Do not advise. Refer to qualified contabilista. Document gap.

Section 10 -- Test suite

Test 1 -- Standard services, mid-range

Input: Quarterly gross services EUR 9,000, no employment, established. Expected output: Relevant income = EUR 2,100/month. Contribution = EUR 449.40/month. Annual: EUR 5,392.80.

Test 2 -- Minimum base applies

Input: Quarterly gross services EUR 1,500. Expected output: Relevant income = EUR 350/month. Below minimum. Base = EUR 480.43. Contribution = EUR 102.81/month.

Test 3 -- Maximum base applies

Input: Quarterly gross services EUR 30,000. Expected output: Relevant income = EUR 7,000/month. Capped at EUR 5,765.16. Contribution = EUR 1,233.74/month.

Test 4 -- First year exempt

Input: Activity opened 4 months ago, quarterly gross EUR 12,000. Expected output: Exempt (within first 12 months). Contributions = EUR 0.

Test 5 -- Goods-only income

Input: Quarterly gross goods sales EUR 20,000, no employment. Expected output: Relevant income = EUR 1,333.33/month. Contribution = EUR 285.33/month.

Test 6 -- Concurrent employment, exemption applies

Input: Employment salary EUR 1,500/month, self-employed quarterly services EUR 2,000. Expected output: Self-employed relevant income = EUR 466.67/month (below 4 x IAS). Exemption applies. Contributions = EUR 0.

Test 7 -- Empresário em nome individual

Input: Sole proprietor with employees, quarterly services EUR 15,000. Expected output: Rate = 25.2%. Relevant income = EUR 3,500/month. Contribution = EUR 882.00/month.

Disclaimer

This skill and its outputs are provided for informational and computational purposes only and do not constitute tax, legal, or financial advice. Open Accountants and its contributors accept no liability for any errors, omissions, or outcomes arising from the use of this skill. All outputs must be reviewed and signed off by a qualified professional (such as a CPA, EA, tax attorney, or equivalent licensed practitioner in your jurisdiction) before filing or acting upon.

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