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Home›New Zealand›Self-Employed Tax Calculator

Self-Employed Tax Calculator New Zealand 2025/26

Income tax, ACC levies, provisional tax, and deductions for sole traders and contractors. No PAYE — plan your tax obligations accurately.

NZ self-employment: no PAYE deducted at source — income tax, ACC levies, and provisional tax are all your responsibility.
$
Total income from self-employment before any deductions
$
All deductible business costs (not personal expenses)
Work levy rate: $0.06 per $100 of liable earnings
GST registration is mandatory if annual revenue exceeds $60,000.
—
Estimates only. Consult a tax professional or IRD for your filing obligations.

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How to Use This Calculator

Tab "💼 Tax Summary"

Enter your gross revenue (total self-employment income before any deductions) and total business expenses. Select your industry to apply the correct ACC work levy rate. Tick the GST toggle if you are registered. The calculator shows taxable income, income tax, ACC levies (earner's and work), total tax liability, and effective tax rate.

Tab "📅 Provisional Tax"

Choose your provisional tax method — Standard, Estimation, or Ratio. Provisional tax applies if your residual income tax (RIT) exceeds $5,000. You can use the RIT calculated in the Tax Summary tab, or enter your own figure. The calculator shows whether provisional tax is required and the three instalment amounts with payment dates (28 Aug, 15 Jan, 7 May for the standard method).

Tab "🧾 Deductions"

Tick the deductible expense categories that apply to you and enter the annual amounts. The calculator shows your total additional deductions, the tax saving those deductions generate, and your revised tax liability after deductions.

The Formulas

Taxable income:
Taxable income = Gross revenue − Business expenses

NZ income tax (2025/26 brackets):
$0 – $14,000: 10.5%
$14,001 – $48,000: 17.5%
$48,001 – $70,000: 30%
$70,001 – $180,000: 33%
$180,001+: 39%
No tax-free threshold.

ACC earner's levy:
Earner's levy = (Liable earnings ÷ 100) × $1.60
Liable earnings capped at $152,790

ACC work levy (self-employed):
Work levy = (Liable earnings ÷ 100) × industry rate
Rates range from $0.06 (office) to $5.00 (forestry) per $100

Provisional tax — standard method:
Total provisional tax = Prior year RIT × 1.05
Each instalment ≈ Total ÷ 3
Payment dates: 28 Aug, 15 Jan, 7 May

Provisional tax threshold:
Required if residual income tax (RIT) > $5,000

Effective tax rate:
Effective rate = Income tax ÷ Taxable income × 100

All rates sourced from Inland Revenue (IRD) and ACC for the 2025/26 tax year (1 April 2025 – 31 March 2026).

Example: Freelance Designer, $95K Revenue

Sarah — Freelance Graphic Designer, GST registered

Sarah earns $95,000 gross revenue as a sole trader. She has $25,000 in deductible business expenses (software, equipment, home office, accounting). Her industry: Creative/Media.

Gross revenue$95,000
Business expenses$25,000
Taxable income$70,000
Income tax$14,020
ACC earner's levy ($1.60/$100)$1,120
ACC work levy (Creative, $0.10/$100)$70
Total tax + ACC$15,210
Effective income tax rate20.0%
After-tax take-home$54,790

Sarah's RIT (~$14,020) exceeds the $5,000 provisional tax threshold. Under the standard method with a prior-year RIT of $13,000, her provisional tax = $13,650 (105% of $13,000), paid as three instalments of ~$4,550 each on 28 Aug, 15 Jan, and 7 May.

NZ Self-Employment Tax Key Facts

ItemDetail
Tax filingIR3 return due 7 July (or extended with tax agent)
Tax brackets10.5% / 17.5% / 30% / 33% / 39% — no tax-free threshold
ACC earner's levy$1.60 per $100 of liable earnings, cap $152,790
ACC work levyIndustry-based, $0.06–$5.00 per $100 of liable earnings
Provisional tax thresholdRIT > $5,000
Provisional methodsStandard (105%), Estimation, Ratio
Standard method dates28 Aug, 15 Jan, 7 May
Terminal tax due7 February (or 7 April with tax agent)
GST threshold$60,000 annual turnover — compulsory registration
KiwiSaverVoluntary for self-employed (no employer contribution), government contribution still available
Schedular paymentsSome contractors have tax withheld at source (WT code) — check your contract

Frequently Asked Questions

Yes. If you are self-employed (a sole trader or contractor without schedular payments), you must file an IR3 (Individual income tax return) with Inland Revenue each year. The IR3 is due 7 July following the end of the tax year (31 March), or a later date if you use a registered tax agent. You report your total income, deductible expenses, and net profit. Most people file online via myIR.
In NZ tax terms, both sole traders and most contractors are self-employed individuals who file an IR3 and pay provisional tax. The key difference is how they are engaged: a sole trader typically runs their own business selling goods or services, while a contractor provides services under a contract for services to clients. Some contractors receive schedular payments (with tax withheld at source by the payer using a WT tax code), which reduces or eliminates their provisional tax obligation. If you are unsure whether you are an employee or contractor, use IRD's "Are you an employee or contractor?" tool on ird.govt.nz.
KiwiSaver is voluntary for self-employed people. You can contribute any amount directly to your KiwiSaver provider. There is no employer contribution (unlike employees who get at least 3% from their employer), but the government still contributes up to $521.43 per year if you contribute at least $1,042.86. KiwiSaver contributions are made from after-tax income — they do not reduce your taxable income. However, increasing retirement savings reduces your short-term cash flow tax obligations are still based on gross profit.
If you use the estimation method and underestimate your provisional tax, IRD may charge use-of-money interest (UOMI) on the underpayment — currently around 8.35% per annum. However, the standard method (paying 105% of prior year RIT) provides safe harbour from UOMI, even if your actual tax turns out to be higher. If your income has increased significantly from the prior year, consider the estimation method to avoid a large terminal tax bill in February.
Yes. Self-employed people pay both the ACC earner's levy ($1.60 per $100 of liable earnings) and the ACC work levy (an industry-based rate per $100 of liable earnings). Both are invoiced by ACC annually, based on your income as reported to IRD. Liable earnings are capped at $152,790. As a self-employed person, your ACC cover under the Work Account is more limited than an employee's — you receive weekly compensation based on 80% of your liable earnings if you have an accident at work, but only if you have been self-employed for more than 12 months.

Related Calculators

📋 Income Tax Calculator
NZ income tax rates and PAYE for employees 2025/26.
🧾 GST Calculator
Add or remove 15% GST. Check the $60K registration threshold.
🛡 ACC Levy Calculator
Calculate earner's and work levies for 2025/26.
💰 Budget Calculator
Plan your personal budget and savings goals.
🔢 Tax Code Calculator
Find the right NZ tax code for your income situation.

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