Late Tax Penalties NZ: Filing and UOMI| Humphries Associates

Missing a tax deadline does not necessarily mean you have a major tax problem, but it is something we recommend dealing with quickly.

If you file a tax return late, Inland Revenue may charge a late filing penalty. If you pay tax late, IRD may charge late payment penalties plus use-of-money interest (UOMI). If overdue returns or tax arrears are left unresolved, IRD can also take collection action.

At Humphries Associates, our approach is straightforward: work out exactly what is overdue, get outstanding returns filed, establish how much tax is actually owed, and put a realistic plan in place to bring the account up to date.

The information below reflects Inland Revenue guidance current as at 2 September 2026. Tax rules, interest rates and individual circumstances can change, so this is general information rather than advice for your specific tax position.

Quick answer

If you have made a late tax payment in NZ, acting early will usually give you more options.

For most overdue tax payments, IRD can initially charge:

1% on the day after the payment due date
a further 4% on the amount still outstanding, including penalties, on the seventh day after the payment due date
a further 1% each month for some types of tax that remain unpaid

The monthly 1% late-payment penalty does not currently apply to modern GST debt, income tax including provisional tax, or Working for Families overpayments. Different rules can apply to other obligations, particularly employer-related taxes.

In addition, IRD may charge use-of-money interest. As at 2 September 2026, the underpayment UOMI rate is 8.97% per annum, effective since 16 January 2026. Interest is calculated daily and does not compound.

Filing late is a separate issue. Depending on the return involved, IRD may impose a late filing penalty even if you eventually have little or no tax to pay.

Our main advice is therefore simple: do not wait until you have enough cash to deal with everything before taking action. File what needs to be filed and address the payment problem separately.

An IRD installment arrangement is not the only option. If the overdue amount is provisional or terminal income tax, tax pooling through a provider can allow the tax to be treated as paid on time, removing late payment penalties and replacing IRD’s use-of-money interest with a typically lower interest cost. We explain how this works in Step 5 below.

What this means for a New Zealand business

There are two issues we look at separately when a business has fallen behind with IRD.

1. Is a return overdue?

A business may have an outstanding income tax, GST or employer information return.

If a return remains outstanding, IRD may not know the correct amount of tax you owe. In some situations, IRD can make a default assessment, effectively estimating the amount of tax due.

That estimate may not reflect the real financial position of your business.

IRD recommends filing an overdue return as soon as possible. If the return remains outstanding and IRD does not hear from you, it may begin collecting the default assessment, continue adding applicable penalties and interest, and potentially progress the debt towards legal recovery.

2. Is tax unpaid?

You can have filed every return correctly but still have tax arrears in NZ because you did not have enough cash available on the payment date.

That creates a different problem.

IRD may apply late-payment penalties and UOMI to the amount outstanding. The longer the situation is ignored, the fewer options a business may have.

This is why we generally prefer to get the filing position up to date first. Once the correct tax liability is known, we can look at how the debt can realistically be managed.

How it works step by step

If you realise a return or tax payment is overdue, we would normally work through the problem in this order.

Step 1: Identify every overdue obligation

Start with myIR and establish:

which returns are overdue
which payments are overdue
the tax type involved
the original due dates
penalties already charged
interest already charged
any upcoming tax obligations

Do not look only at the total balance. Understanding how the debt arose matters.

Step 2: File outstanding returns

Where possible, we recommend getting outstanding returns prepared and filed promptly.

IRD specifically advises taxpayers to file overdue returns as soon as possible. You may discover that the final amount owing is different from the amount you expected, or you could even be entitled to a refund.

Step 3: Pay what you reasonably can

If you can clear the debt without compromising essential business obligations, paying it quickly limits further interest.

If you cannot pay the full balance, do not simply ignore it.

Step 4: Contact IRD about an instalment arrangement

IRD allows taxpayers who cannot pay a debt in full to apply for an installment arrangement.

You can generally propose weekly, fortnightly or monthly repayments based on what you can realistically afford. IRD may ask for additional financial information before accepting an arrangement.

An agreed arrangement is considerably different from simply sending IRD random part-payments.

IRD states that making regular payments without an agreed installment arrangement may still leave you exposed to penalties and interest at the full applicable rates.

Step 5: Consider tax pooling as an alternative to an IRD arrangement

An IRD installment arrangement is not the only way to manage late income tax. If the overdue amount is provisional tax or terminal (end-of-year) income tax, tax pooling through an IRD-approved intermediary can often be a cheaper and more flexible option.

Tax pooling works because tax pooling providers hold funds that were deposited with IRD on earlier due dates. You can buy tax that was paid on your original due date and have it transferred to your IRD account. IRD then treats your tax as having been paid on time, so late payment penalties are removed and IRD’s use-of-money interest is replaced by the provider’s interest cost, which is typically lower.

Tax pooling does however have limits. It does not remove late filing penalties, and it is generally not available for GST or PAYE that was simply not paid on the original return. Those debts usually still need to be resolved directly with IRD, often through an installment arrangement.

Tax pooling transactions are generally arranged through your accountant or tax agent. Where income tax is involved, we compare the total cost of tax pooling against an IRD installment arrangement before recommending which route to take, and in some cases a combination of both is the most practical solution.

Step 6: Protect the next tax deadline

Solving old tax debt while creating new debt achieves very little.

We therefore look at upcoming GST, PAYE, provisional tax and terminal tax obligations as part of the same exercise.

The repayment amount needs to be affordable after allowing for current tax obligations.

Calculations, records or decisions involved

The amount a late tax problem costs depends on whether the issue involves filing, payment, or both.

Late income tax return penalties

As at 2 September 2026, IRD’s late filing penalties for an income tax return depend on net income:

Net income	Late filing penalty
Less than $100,000	$50
$100,000 to $1 million	$250
More than $1 million	$500

IRD may initially charge $50 and adjust the penalty after the late return is filed and the actual net income is known.

Late GST return penalties

The IRD late filing penalty for a GST return depends on the accounting basis being used:

Payments basis: $50
Invoice or hybrid basis: $250

These are filing penalties, so they are separate from penalties or interest that may apply if the GST itself is also unpaid.

A simple late-payment example

Suppose a business has $10,000 of income tax due and does not qualify for a grace period or another concession.

The initial late-payment penalties could work approximately like this:

Day after payment was due

1% of $10,000 = $100

Outstanding amount after the penalty = $10,100.

Seventh day after the due date

4% of $10,100 = $404

The two initial late-payment penalties would therefore total approximately $504.

UOMI would also apply.

At the current 8.97% annual underpayment rate, 30 days of interest on $10,000 alone would be roughly:

$10,000 × 8.97% × 30 ÷ 365 = approximately $73.73

This is only an illustration. IRD calculates interest daily based on the actual amounts and dates on the tax account, so we would always check the account itself before relying on an estimate.

Common mistakes and risks

One of the biggest mistakes we see is a business owner avoiding the problem because they cannot afford to pay the whole amount.

Filing and paying are separate obligations. Delaying the return because you cannot afford the payment can make the situation worse.

Practical checklist

If you have filed or paid tax late, we recommend working through this checklist:

Log into myIR and identify every overdue return and payment.
Check the original filing and payment dates.
Review penalties and interest already applied.
Gather the accounting records needed to complete outstanding returns.
File overdue returns as soon as they can be accurately completed.
Confirm the correct tax liability after filing.
Pay as much of the outstanding balance as is reasonably affordable.
Contact IRD if you cannot pay the balance in full.
Consider an agreed installment arrangement rather than informal part-payments.
Review whether tax pooling may be appropriate for qualifying income or provisional tax situations.
Build upcoming GST, PAYE, provisional tax and terminal tax into your cash-flow forecast.
Put reminders and accounting processes in place so the same problem does not recur.

If it is your first late payment within a two-year period, IRD may provide a grace period before penalties are charged. IRD will tell you if this applies. If the revised deadline is also missed, penalties can be calculated from the original payment date.

We would not assume a grace period applies until IRD has confirmed it.

When to speak with an accountant or business adviser

A payment being a few days late because of an administrative mistake can often be resolved fairly quickly.

We would recommend getting professional advice sooner where:

several returns are overdue
the amount owing is significant
PAYE or employer taxes are involved
IRD has issued a default assessment
you have received debt recovery correspondence
you cannot meet both the old tax debt and upcoming tax payments
your business has an ongoing cash-flow problem
you are considering an instalment arrangement
you want to understand whether tax pooling is available
you are unsure whether IRD’s assessment is correct

At Humphries Associates, our tax return services can help get overdue filing obligations up to date, establish the actual amount owing and work through the available options.

Where the problem is primarily cash flow rather than compliance, we also want to understand why the business did not have enough cash available when the tax fell due. Sometimes the tax debt is the symptom of a wider cash-flow issue that needs to be addressed.

The important thing is to act before the problem becomes harder to solve. IRD itself encourages taxpayers who are struggling to file or pay to make contact and work towards a solution.

Frequently asked questions

What is the short answer for a New Zealand business?

If you file a tax return late, IRD may impose a late filing penalty. If you pay tax late, IRD may charge late-payment penalties and use-of-money interest. The best response is normally to file outstanding returns promptly, establish exactly what you owe and contact IRD early if you cannot pay the balance in full.

What records or information will I need?

We would start with your myIR account, bank statements, accounting software records, invoices, receipts, GST information, payroll records and any correspondence received from IRD. The exact information required depends on which return or tax payment is overdue.

What are the most common mistakes?

The most common mistake is doing nothing because the full tax bill cannot be paid immediately. Other problems include leaving returns unfiled, ignoring IRD correspondence, making informal part-payments without an agreed arrangement and failing to budget for upcoming tax while repaying historical debt.

Can tax pooling help if I have paid income tax late?

Often, yes. For provisional and terminal income tax, an IRD-approved tax pooling provider such as Tax Traders can let you buy tax that was paid to IRD on your original due date. IRD then treats your tax as paid on time, removing late payment penalties, and you pay the provider’s interest cost instead of IRD’s use-of-money interest. For income tax this generally needs to be arranged within 75 days of your terminal tax date. Tax pooling does not remove late filing penalties and is generally not available for unpaid GST or PAYE, so those debts usually still need an IRD installment arrangement.

When should I get professional advice?

We recommend seeking advice when multiple returns are overdue, the debt is material, PAYE is involved, IRD has begun recovery action, or paying the debt will create significant cash-flow pressure. An accountant can help establish the correct liability, bring filing up to date and assess the available repayment or tax-management options.

This article provides general information about New Zealand tax obligations and does not constitute personalised tax, accounting or financial advice. Tax treatment and the options available depend on your circumstances. Rates, thresholds and Inland Revenue policies should be checked at the time advice is required.

Last reviewed against Inland Revenue guidance: 2 September 2026.

What Happens If You File or Pay Tax Late in New Zealand?