GST and provisional tax bills on the main street

There’s a particular kind of stress that comes from a tax bill arriving in the wrong month. The café had a cracking December, the GST on all those sales is due — and January turned out to be quiet. Or the beach shop did well all summer, and the provisional tax instalment lands in May when the street’s empty.

The tax itself isn’t the problem. The timing is.

How do GST and provisional tax hit main-street cash flow?

GST. Business.govt.nz says GST is charged at 15% and you must register once you expect to earn more than $60,000 in 12 months. You collect it on every sale and pay it to Inland Revenue on your filing dates. Inland Revenue lets businesses file monthly, 2-monthly or — if sales are under $500,000 a year — 6-monthly. The bigger your peak season, the bigger the GST payment that follows it.

Provisional tax. Inland Revenue says you’ll have to pay provisional tax if you had more than $5,000 of residual income tax in your last return. For a 31 March balance date using the standard or estimation option, instalments fall on:

Instalment	Due date
First	28 August
Second	15 January
Third	7 May

For a summer-heavy business, May and August often fall in the quiet season. For a ski-town business, January can be the quiet one.

What happens if I pay late?

Inland Revenue charges a late payment penalty the day after the due date and a further penalty a week later, and interest can apply too. It notes that if it’s your first late payment in a two-year period, it may give you a grace period before charging penalties. Ignoring a tax bill only makes it larger.

What are the options when a tax bill lands in a quiet month?

1. Set it aside as you go. The best defence. Many owners move a percentage of every week’s takings into a separate tax account.

2. An instalment arrangement with Inland Revenue. Inland Revenue says making regular agreed payments under an instalment arrangement reduces the penalties you pay — but that without a formal arrangement, you might still be charged penalties and interest at the full rate even if you’re paying regularly. Arrangements can be requested through myIR.

3. Short-term business funding. For a trading business with a clear seasonal pattern, an unsecured facility — typically $5,000 to $500,000 — can pay the bill on time, with repayments from the following months’ takings. It keeps your record with Inland Revenue clean and your supplier relationships unaffected.

4. Property-secured funding. If tax arrears have built up over time, a property-secured business loan ($20,000 to $5,000,000) can sometimes clear them on a longer term. IRD debt is considered case by case.

Option	Suits
Setting aside weekly	Every business, every year
IRD instalment arrangement	Smaller amounts you can clear steadily
Short-term funding	Seasonal businesses with a predictable recovery
Property-secured loan	Larger or older arrears, with a longer runway

Not sure which fits? Start an enquiry and a person will talk through the options with you. There’s no credit check to ask.

See your tax months before they arrive

Our cash gap estimator places your GST payments and your three provisional tax instalments into your own seasonal pattern, so you can see which months run short — weeks or months before they do. If a gap appears, you have time to plan.

An illustrative example

Illustrative only. A gift shop files GST 2-monthly and is a provisional taxpayer with a March balance date. Its December–January GST payment and the 15 January provisional instalment both land in a quiet stretch of the year.

The owner now moves a set share of every week’s takings into a tax account. In a year when December disappointed, they arranged a small facility to pay both on time and cleared it by April — avoiding penalties and keeping their tax record clean.

How much should you set aside each week?

Your accountant can give you a precise figure, but the method is simple:

1. GST. If you’re registered, a portion of every GST-inclusive sale belongs to Inland Revenue. Take your weekly takings, work out the GST portion, subtract the GST on your weekly purchases, and move the difference into a tax account.
2. Income tax. Ask your accountant for an estimate of this year’s tax based on your profit so far, divide it across the weeks until each instalment, and add that to the weekly transfer.
3. Review quarterly. If trade is running ahead or behind, adjust. Setting aside too little in a good year is how year-two tax shocks happen.

A separate account at the same bank, with an automatic weekly transfer, removes the temptation to use the money for something else. Our guide to first-year main-street costs covers the other lumps worth adding to the same account.

Don’t forget ACC

ACC levies are another annual lump. ACC sends its invoice after you’ve filed a tax return, and businesses can pay in full or spread it over three, six or ten monthly instalments by direct debit. ACC notes that from 1 April 2026, instalment interest applies to all instalment plans. Add the levy to your tax account plan so it doesn’t arrive as a surprise.

Ready to take the sting out of tax time?

If a GST or provisional tax bill is about to land in a quiet month, start your 60-second enquiry. Asking doesn’t touch your credit file, your details stay with one team rather than being sent around, and a person will ring to talk it through. Please tell us accurately what’s due, when, and anything you already owe — it helps us find the right option first time.