Asked about New Zealand provisional tax for self-employed individuals.
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This Guide is general tax/accounting reference material for AI-assisted workflows. It has not been reviewed for your personal facts, documents, elections, deadlines, residency, filing status, or local procedures. Do not rely on it to file, pay, amend, or take a tax position without review by a qualified professional in the relevant jurisdiction.
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RIT threshold to trigger provisional tax obligation
$5,000 (must EXCEED — if exactly $5,000, no provisional tax)Income Tax Act 2007 (ITA 2007), Part RC
Standard uplift factor applied to prior year RIT
105%Income Tax Act 2007 (ITA 2007), Part RC
Number of standard instalments (31 March balance date, no EOT)
3 instalmentsIncome Tax Act 2007 (ITA 2007), Part RC
1st provisional tax instalment due date (31 March balance date)
28 AugustIncome Tax Act 2007 (ITA 2007), Part RC
2nd provisional tax instalment due date (31 March balance date)
15 JanuaryIncome Tax Act 2007 (ITA 2007), Part RC
3rd provisional tax instalment due date (31 March balance date)
7 MayIncome Tax Act 2007 (ITA 2007), Part RC
1st provisional tax instalment due date — tax agent EOT (two-instalment regime)
28 OctoberIncome Tax Act 2007 (ITA 2007), Part RC
2nd provisional tax instalment due date — tax agent EOT (two-instalment regime)
7 MayIncome Tax Act 2007 (ITA 2007), Part RC
Number of instalments under tax agent EOT
2 instalments of 50% eachIncome Tax Act 2007 (ITA 2007), Part RC
Terminal tax due date (without EOT)
7 FebruaryTax Administration Act 1994 (TAA 1994)
Terminal tax due date (with EOT)
7 AprilTax Administration Act 1994 (TAA 1994)
UOMI underpayment rate (2025)
~10.91% (2025)Tax Administration Act 1994 (TAA 1994), ss 120A-120Q
UOMI overpayment rate (2025)
~3.41% (2025)Tax Administration Act 1994 (TAA 1994), ss 120A-120Q
Late payment penalty — initial charge
1%Tax Administration Act 1994 (TAA 1994)
Late payment penalty — additional charge if still unpaid after 7 days
4%Tax Administration Act 1994 (TAA 1994)
Late IR3 filing penalty
$250 (may increase)Tax Administration Act 1994 (TAA 1994)
Shortfall penalty — deliberate understatement range
20%–150%Tax Administration Act 1994 (TAA 1994)
AIM method — gross income eligibility ceiling
< $5,000,000Income Tax Act 2007 (ITA 2007), Part RC
First year of earning SE income — provisional tax obligation
No provisional tax obligation in the first yearIncome Tax Act 2007 (ITA 2007), Part RC
Standard balance date (New Zealand)
31 MarchIncome Tax Act 2007 (ITA 2007)
RIT formula
RIT = income_tax_assessed - PAYE_credits - RWT_credits - other_withholdingIncome Tax Act 2007 (ITA 2007), Part RC
Standard uplift provisional tax formula
provisional_tax = prior_year_RIT × 105%; each_instalment = provisional_tax ÷ 3 (standard) or ÷ 2 (EOT)Income Tax Act 2007 (ITA 2007), Part RC
Terminal tax formula
terminal_tax = actual_RIT - provisional_tax_paidIncome Tax Act 2007 (ITA 2007), Part RC
Non-standard balance date (30 September) — 1st instalment due date
28 FebruaryIncome Tax Act 2007 (ITA 2007), Part RC
Non-standard balance date (30 September) — 2nd instalment due date
15 JulyIncome Tax Act 2007 (ITA 2007), Part RC
Non-standard balance date (30 September) — 3rd instalment due date
7 NovemberIncome Tax Act 2007 (ITA 2007), Part RC
Terminal tax due date — first year of self-employment (no EOT)
7 February following year-endTax Administration Act 1994 (TAA 1994)
Bank statement debit date range — 1st instalment (28 Aug) identification window
20 August – 5 SeptemberIncome Tax Act 2007 (ITA 2007), Part RC
Bank statement debit date range — 2nd instalment (15 Jan) identification window
8 January – 20 JanuaryIncome Tax Act 2007 (ITA 2007), Part RC
Bank statement debit date range — 3rd instalment (7 May) identification window
1 May – 14 MayIncome Tax Act 2007 (ITA 2007), Part RC
Quick reference field table
| Field | Value |
|---|---|
| Country | New Zealand |
| Tax | Provisional income tax |
| Primary legislation | Income Tax Act 2007 (ITA 2007), Part RC |
| Supporting legislation | Tax Administration Act 1994 (TAA 1994), ss 120A-120Q (UOMI) |
| Authority | Inland Revenue (IR / Te Tari Taake) |
| Portal | myIR (myir.ird.govt.nz) |
| Currency | NZD only |
| Threshold | RIT (residual income tax) must exceed $5,000 to trigger obligation |
| Default method | Standard uplift: prior year RIT x 105%, divided by 3 instalments |
| Alternative methods | Estimation method, AIM (Accounting Income Method) |
| Standard balance date | 31 March |
| Contributor | Open Accountants Community |
| Validated by | Pending -- requires sign-off by NZ Chartered Accountant (CA) |
| Validation date | Pending |
Standard instalment schedule (31 March balance date)
| Instalment | Due date | Amount |
|---|---|---|
| 1st | 28 August | 1/3 of (RIT x 105%) |
| 2nd | 15 January | 1/3 of (RIT x 105%) |
| 3rd | 7 May | 1/3 of (RIT x 105%) |
Conservative defaults
| Ambiguity | Default |
|---|---|
| Method unclear | Use standard uplift (no UOMI risk if paid on time) |
| RIT threshold borderline | If exactly $5,000, no provisional tax (must EXCEED $5,000) |
| Balance date non-standard | Verify instalment dates in IR's provisional tax calendar |
| Tax agent EOT | May change to 2 instalments -- confirm |
| First year of SE income | No provisional tax obligation |
This is the deterministic pre-classifier for bank statement transactions. When a debit matches a pattern below, classify it as a provisional tax payment.
Inland Revenue provisional tax debits
| Pattern | Treatment | Notes |
|---|---|---|
| IRD, INLAND REVENUE, IR PAYMENT | Provisional tax payment | Match with Aug/Jan/May timing |
| PROVISIONAL TAX, PROV TAX | Provisional tax payment | Explicit description |
| MYIR PAYMENT | Provisional tax payment | Online payment via myIR |
| TERMINAL TAX | NOT provisional tax | Year-end balance -- flag separately |
Timing-based identification
| Debit date range | Likely instalment | Confidence |
|---|---|---|
| 20 August -- 5 September | 1st instalment (28 Aug) | High if IR payee |
| 8 January -- 20 January | 2nd instalment (15 Jan) | High |
| 1 May -- 14 May | 3rd instalment (7 May) | High |
| January -- February (following year) | Terminal tax | Flag separately |
Related but NOT provisional tax
| Pattern | Treatment | Notes |
|---|---|---|
| GST, GOODS AND SERVICES TAX | EXCLUDE | GST payment |
| ACC LEVY | EXCLUDE | Accident Compensation levy |
| STUDENT LOAN | EXCLUDE | Student loan repayment |
| KIWISAVER | EXCLUDE | Retirement savings |
| CHILD SUPPORT, IR CHILD | EXCLUDE | Child support via IR |
| PENALTIES AND INTEREST IR | EXCLUDE | Penalty/interest charge |
| TERMINAL TAX | Flag separately | Year-end balance, not provisional |
Example 1 instalment table
| Instalment | Due date | Amount |
|---|---|---|
| 1st | 28 August | $5,250 |
| 2nd | 15 January | $5,250 |
| 3rd | 7 May | $5,250 |
| Total | $15,750 |
Input: Prior year RIT = $15,000. Standard uplift. 31 March balance date.
(Calculation: $15,000 x 105% = $15,750. Each instalment = $15,750 / 3 = $5,250.)
Input: Prior year RIT = $4,800.
Output: RIT does not exceed $5,000. No provisional tax required. Client pays terminal tax only.
Input: Prior year RIT = $25,000. Estimated current year RIT = $12,000.
Output: Standard uplift would require $26,250. Estimation method: pay $12,000 / 3 = $4,000 per instalment. Warning: if actual RIT > $12,000, UOMI applies from instalment dates.
Example 4 instalment table
| Instalment | Due date | Amount |
|---|---|---|
| 1st | 28 October | $26,250 |
| 2nd | 7 May | $26,250 |
Input: Prior year RIT = $50,000. Tax agent with EOT.
(Calculation: $50,000 x 105% = $52,500. Two instalments of $26,250.)
Input line: 28.08.2025 ; IRD PROVISIONAL TAX ; DEBIT ; -5,250.00 ; NZD
Classification: Provisional tax, 1st instalment 2025/26. Tax payment -- not a deductible expense.
UOMI rate table
| Rate type | Rate (verify annually) |
|---|---|
| Underpayment rate | ~10.91% (2025) |
| Overpayment rate | ~3.41% (2025) |
UOMI exposure by method
| Method | UOMI exposure |
|---|---|
| Standard uplift (paid on time) | None -- safe harbour |
| Estimation | UOMI from each instalment date if estimate < actual |
| AIM (correct and on time) | None |
Late payment penalties
| Offence | Penalty |
|---|---|
| Late payment | 1% initial + 4% if still unpaid after 7 days |
| Late IR3 filing | $250 (may increase) |
| Shortfall from deliberate understatement | 20-150% |
Method selection guidance table
| Situation | Recommended method | Rationale |
|---|---|---|
| Income stable or growing | Standard uplift | Safe harbour, no UOMI risk |
| Income dropping significantly | Estimation | Lower cash outflow, but UOMI risk |
| Irregular/seasonal income | AIM | Pay as you earn, no UOMI |
| First year of business | No provisional tax | Exempt; voluntary payments accepted |
Flag estimation method for reviewer whenever recommended.
No provisional tax obligation. Terminal tax due 7 February following year-end. May voluntarily pay to avoid large lump sum.
Standard uplift = $31,500 but expected RIT = $10,000. Use estimation method ($10,000/3 per instalment). UOMI risk if actual exceeds estimate.
RIT = total tax minus PAYE credits. If RIT > $5,000, provisional tax on RIT amount.
Instalment dates shift. 30 September balance date: instalments 28 February, 15 July, 7 November.
No provisional tax. Must EXCEED $5,000.
First-year freelancer may make voluntary payments. UOMI overpayment interest may apply.
The 7 May instalment falls AFTER the 31 March year-end. This is correct by design.
Before delivering output, verify:
Input: Prior year RIT = $15,000. 31 March balance date. Expected: $15,750 total. 3 x $5,250. Dates: 28 Aug, 15 Jan, 7 May.
Input: Prior year RIT = $4,800. Expected: No provisional tax.
Input: Prior year RIT = $25,000. Estimated current = $12,000. Expected: $4,000 per instalment. UOMI warning.
Input: Prior year RIT = $50,000. Expected: $52,500 total. 2 x $26,250. Dates: 28 Oct, 7 May.
Input: New freelancer, no prior RIT. Expected: No provisional tax. Terminal tax by 7 Feb.
Input: Prior year RIT = $5,000. Expected: No provisional tax (must exceed $5,000).
Input: PAYE salary $60,000. SE $20,000. RIT = $6,000. Expected: Provisional tax on $6,000 RIT. Uplift: $6,300 / 3 = $2,100.
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 New Zealand Chartered Accountant or equivalent licensed practitioner) before filing or acting upon.
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Other New Zealand computations in the OpenAccountants Tax Library.
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