Why do I owe IRD money? The usual reasons, and how to read myIR

An IRD balance you weren’t expecting is unsettling. Before you decide how to deal with it, it’s worth understanding where it came from. Sometimes the answer is simple and fixable. Sometimes it points to something that will happen again unless you change how tax is managed.

What are the most common reasons businesses owe IRD?

Cause	What happened	Typical fix
Provisional tax too low	Instalments based on a weaker year, profit jumped	Pay terminal tax; review method
Second-year terminal tax	Year one’s tax arrives as year two’s instalments start	Plan cash; consider funding or pooling
GST timing	Invoiced sales, unpaid by customers, still attracted GST	Collect faster; consider payments basis
Missed payment	A due date slipped past	Pay now; set up reminders
Reassessment	IRD or your accountant amended a return	Check it; pay or query
Default assessment	A return wasn’t filed and IRD estimated	File the actual return
Misallocated payment	Paid to the wrong tax type or period	Ask IRD to transfer it
Penalties and interest	An older balance has grown	Clear the core tax to stop growth
SBC loan default	A Small Business Cashflow loan term ended unpaid	See SBC loan default

How do you read your myIR statement?

Log into myIR and look at your account for each tax type. For each period, check:

1. The original tax assessed. Does it match the return you or your accountant filed?
2. Payments credited. Are all your payments there, against the right period?
3. Penalties. When were they added, and at what stage?
4. Interest. How much use-of-money interest has accrued?
5. Notices. Read any overdue notices or messages. Since 2026, two automated overdue notices can count toward credit reporting for companies (see overdue notices).

If something doesn’t add up, ask your accountant to reconcile it before you pay or argue.

Why can provisional tax leave you owing?

Provisional tax is a prediction. Under the standard method, it’s last year’s residual income tax plus 5% (business.govt.nz). If this year is much better, the instalments won’t cover it, and the difference is due as terminal tax. In the second year of trading, there’s often no provisional tax for year one at all, so the full year-one bill arrives just as year-two instalments start. Read provisional tax for the methods and dates.

Why can GST leave you owing even when cash is tight?

On the invoice basis, GST is generally payable for the period you invoice in, even if the customer hasn’t paid. A big invoice paid late can mean GST due before the money arrives. See GST debt.

Worked out why, and now need to clear it? See whether funding fits. No credit check to enquire.

Why does the balance keep growing?

Because penalties and interest don’t wait. For most taxes, a 1% penalty applies the day after the due date and 4% on day seven; PAYE and other employer deductions attract 10% each month (IRD). Use-of-money interest is charged daily. Across New Zealand, penalties and interest made up about a third of overdue tax debt at the end of 2025. See late payment penalties.

What if you think IRD is wrong?

Raise it quickly and in writing, with your accountant’s help. Ask IRD to explain the assessment, check payments have been allocated correctly, and, if a return has been estimated, file the real one. Don’t let a query run past a due date without paying the amount that’s clearly owed; penalties and interest continue on whatever turns out to be correct.

What should you do once you understand the balance?

Choose a route while you still have choices:

• Pay it if you can, and fix the cause.
• Set up an instalment arrangement for a manageable balance.
• Clear it with a loan if it’s large, growing fast or includes PAYE.
• Use our options checker for a ranked plan.

An illustrative example

Illustrative only. Not a real client and not an offer.

A Napier builder was puzzled by a $41,000 IRD balance when he believed he was up to date. His accountant found three things: a provisional instalment paid to the GST account by mistake, a GST period with a large invoice unpaid by the client, and penalties on both. IRD transferred the misallocated payment, which cut the balance to $26,000. He cleared the rest with a short cash-flow loan and moved to monthly GST filing.

How do you stop a surprise next year?

Most IRD surprises come from not seeing the number early enough. A few habits fix that:

• Ask your accountant for a mid-year tax estimate, especially if trading is well up or down on last year.
• Move tax money out of the trading account as you earn it, so the balance is there when the bill comes.
• Check myIR monthly, not just at return time, and make sure notifications reach a director.
• Put every due date in the calendar. Our due-date timeline covers GST, PAYE, provisional and terminal tax.
• Reconcile payments after each one, so misallocations are caught in days, not months.

None of this is complicated, but together they turn tax from a series of shocks into a predictable cost.

Get help clearing what you owe

Once you know why you owe IRD, let us help you clear it. An enquiry doesn’t involve a credit check, your details aren’t distributed to a crowd of lenders, and a real person will call you. The more accurately you describe the balance and how it arose, the better we can match the solution to the problem.