NZ Tax Code Picker (IR330 Helper)

Related: Are you owed a tax refund? A part year, a second job on a secondary code, or the wrong tax code all leave too much PAYE deducted. Work out what IRD owes you.
Quick answer Your main job uses code M (or ME with the independent earner credit); a second job uses a secondary code chosen by your TOTAL income, which is why the second job's code can be SH or ST even on modest wages. Answer the questions and this picks the code.

Picking the wrong box on your IR330 form is one of the easiest ways to end up under-paid each payday or land a surprise tax bill at year end. This tool asks the same questions as the IR330 and works out the exact tax code your employer needs, using the 2026/27 thresholds. Tell it whether this is your main job or a secondary one, then enter your expected annual income (and, for a secondary job, your combined income across all jobs, since that total sets your secondary rate). Add whether you have an active student loan and, for a main job, whether you already receive Working for Families, a main benefit or NZ Super, since these rule out the Independent Earner Tax Credit. You then get your code, from M or ME through to SB, S, SH, ST or SA, with an SL suffix where it applies, a plain-language explanation of why it fits your circumstances, and an annual deductions estimate showing tax, ACC levies, student loan repayments and take-home pay. A mismatch, such as total income below the secondary job's own income, triggers a warning so you can check your figures. Use the result on your IR330 straight away, since leaving the form blank forces your employer onto the 45% no-notification rate. For complex cases, confirm with IRD or a tax adviser.

Updated  Implements IR330 selection logic per IRD 2026/27 thresholds.
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Step 1: Income source

If you have multiple jobs, the highest-paying one uses a primary code (M / ME). All others use secondary codes (S / SH / ST / SA / SB).

Step 2: Income

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Step 3: Student loan

Add SL suffix if yes. Repayment is 12% of every dollar over $24,128 (annual) on your primary job, or 12% of all gross on secondary jobs.

Step 4: Other income / benefits (primary code only)

If you receive any of these, you cannot use the ME code (which includes the IETC). The IETC and these benefits cannot be received at the same time.

Primary tax codes explained

  • M - Main job, no IETC. Use if your annual income is below $24,000 or above $70,000, or if you receive Working for Families, a main benefit, or NZ Super.
  • ME - Main job + Independent Earner Tax Credit ($520/year). Use if your annual income is between $24,001 and $70,000 AND you don't receive WfF, main benefit, or NZ Super.
  • M SL - Main job with student loan deductions (12% over $24,128 annual threshold).
  • ME SL - Main job + IETC + student loan.

Secondary tax codes explained

  • SB - 10.5% - Use if your TOTAL income from all sources is under $15,600.
  • S - 17.5% - Use if total income is $15,601 to $53,500.
  • SH - 30% - Use if total income is $53,501 to $78,100.
  • ST - 33% - Use if total income is $78,101 to $180,000.
  • SA - 39% - Use if total income is over $180,000.
  • Add SL to any of the above for a student loan secondary deduction (e.g. S SL, SH SL).

Other tax codes

  • CAE - Casual agricultural employees (17.5% flat).
  • EDW - Election day workers (17.5% flat).
  • NSW - Non-resident seasonal workers (10.5% flat for RSE workers).
  • WT - Withholding tax for schedular payments (contractor income).
  • STC - Special tax code (only with IRD certificate).

The 45% no-notification trap

If you don't give your employer a completed IR330 form (with your IRD number and tax code), they must deduct PAYE at the no-notification rate of 45% on every dollar. This is higher than even the 39% top marginal rate. Always submit an IR330 on day one of any new job.

Sources

This tool provides general guidance only. If your situation is complex (multiple jobs, partial-year income, schedular payments, special STC), confirm with IRD or a tax adviser before submitting your IR330.

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Frequently asked questions

What is the difference between M and ME tax codes in NZ?

M is the standard primary tax code. ME is M plus the Independent Earner Tax Credit (IETC), which gives you up to $520 per year extra in your take-home pay. ME applies if your annual income is between $24,000 and $70,000 AND you don't receive Working for Families, a main benefit, NZ Super, or an overseas equivalent. The IETC is fully available up to $66,000 income and abates by 13c per dollar above that, phasing out at $70,000.

What happens if I don't provide a tax code?

If you don't provide an IR330 form (or your IRD number) to your employer, they must deduct PAYE at the no-notification rate of 45% on every dollar of your wages. This is the highest possible PAYE rate and will leave you significantly under-paid each pay period. Always complete an IR330 with your correct code as soon as you start a new job.

Which secondary tax code should I use for my second job?

Your secondary tax code depends on your TOTAL expected annual income from all jobs. SB applies if total income is under $15,600. S applies if total is $15,601 to $53,500. SH applies if total is $53,501 to $78,100. ST applies if total is $78,101 to $180,000. SA applies if total is over $180,000. The threshold is your total income, not just the secondary job's income.

Do I need an SL suffix on my tax code?

Yes, if you have an active New Zealand student loan and earn above the repayment threshold ($24,128 for the 2026/27 tax year). Add SL to your primary code (M SL or ME SL) so 12% of every dollar above the threshold is automatically deducted as student loan repayment. For secondary jobs with an SL suffix (S SL, SH SL, etc.), 12% is deducted from EVERY dollar of secondary income because the threshold is already used by your main job.

Can I use the ME code if I receive Working for Families?

No. The Independent Earner Tax Credit (IETC) and Working for Families Tax Credits (WFF) cannot be received at the same time. If you currently receive WFF, use the M code (or M SL with student loan). If you stop receiving WFF, you can switch to ME if you also meet the income criteria. The same exclusion applies to recipients of main benefits and NZ Super.