GST & provisional tax, handled

GST in plain English (15%)

GST (Goods and Services Tax) is a flat 15% tax added to most goods and services sold in New Zealand. If you're registered, you charge 15% on top of your prices, collect it from customers, and pass it to IRD, less the GST you paid on your own business purchases.

The key idea that calms people down: you are a collector, not the payer. The GST you charge isn't your money. You hold it and hand it on. The GST you pay on business costs (your input tax) is offset against the GST you collect (your output tax), and you pay or claim the difference.

• Output tax: the 15% you add to your sales
• Input tax: the 15% already inside your business purchases
• Net GST: output minus input, paid to (or refunded by) IRD

Some supplies are zero-rated (such as most exports) and a few are exempt (such as residential rent and certain financial services), which changes how GST applies. Get the treatment right and GST is just plumbing. Get it wrong and you either overpay or build up a debt you didn't see coming.

Do you need to register for GST?

Registration becomes compulsory once your turnover crosses $60,000 in any 12-month period, or once you reasonably expect it will. "Turnover" means your total taxable sales, not your profit, so it's easy to hit sooner than you'd think.

You can also register voluntarily below the threshold. That can make sense if you have significant start-up costs to claim back, or if your customers are themselves GST-registered businesses who don't mind the 15%. It's less attractive if you sell mainly to the public, since adding 15% can make you look dearer.

The trap is leaving registration too late. Once you've passed $60,000 you're meant to be registered, and IRD can backdate it, which means you owe the GST on past sales whether or not you charged it. We watch your turnover and register you at the right moment. Our do I need to register for GST guide runs through the decision in full.

Filing GST returns on time

Once registered, you file GST returns on a set frequency, usually monthly, two-monthly, or six-monthly, depending on your turnover and choice. Most small businesses file two-monthly. Each return reports the GST you collected and the GST you paid, and you settle the difference with IRD.

You'll also choose an accounting basis:

• Payments (cash) basis: account for GST when money actually moves. Kinder on cash flow for small businesses.
• Invoice basis: account for GST when you issue or receive an invoice, regardless of payment. Often required above a turnover limit.
• Hybrid: a mix, used less commonly.

We prepare and file your returns from your Xero file or records, reconcile them so the numbers tie back to your bank, and make sure they're lodged on time. Late GST returns attract penalties and use-of-money interest, and a missed refund is money sitting with IRD instead of in your account. Keeping the filing rhythm tidy also makes your year-end far cheaper, because nothing has to be unpicked later.

Provisional tax: why it surprises people

Provisional tax is income tax paid in instalments during the year, rather than in one lump after year-end. You move into it once your residual income tax for a year is more than $5,000. Effectively IRD says: you owed real tax last year, so pay towards this year as you go.

Here's why it stings. In your first strong year you can end up paying the tax on that year's profit and the first provisional instalments for the next year at nearly the same time. Income tax doesn't come out of your invoices automatically, so unless you've been setting money aside, the combined bill lands hard.

It's entirely predictable once someone maps it out for you. The problem is almost never the rules, it's the cash-flow timing and not seeing it coming. That's the part we plan around: we forecast the instalments, line them up against your expected income, and tell you how much to park aside so the dates arrive without drama.

Standard, estimation and AIM options

There's more than one way to calculate provisional tax, and choosing the right one for your business matters.

The standard method is simple but can over- or under-pay if your income shifts. AIM is genuinely useful for newer or variable businesses, because you only pay tax when you've actually made profit that period, which avoids paying on income you haven't earned yet. We work out which method keeps your cash flow smoothest and your interest exposure lowest, and set it up in your software. The provisional tax explained guide goes deeper on each.

Safe-harbour and avoiding use-of-money interest

When you underpay tax during the year, IRD charges use-of-money interest (UOMI) on the shortfall. It's not a penalty exactly, it's interest on tax you should have paid earlier, but at the rates that apply it adds up quickly on a meaningful bill.

The safe-harbour rule is your main protection. In broad terms, if you pay your standard provisional instalments in full and on time, you're generally shielded from UOMI until the final payment date, even if your actual tax turns out higher. That certainty is worth a lot: it turns a moving target into a fixed set of dates you can plan for.

• Pay the standard instalments on time and you're usually inside the safe harbour.
• Estimate too low, or miss an instalment, and interest can apply from earlier in the year.
• Tax pooling is another tool to manage UOMI on a shortfall after the fact.

We make sure you qualify for safe harbour where it helps, schedule the payments, and step in with options like tax pooling if a one-off spike in income would otherwise create interest. See our provisional tax safe harbour guide for the detail.

Fixed-fee pricing

We price GST and provisional tax work as a fixed fee, agreed before we start. After a free review we look at your filing frequency, transaction volume, and whether your records are already in good order, and quote accordingly.

• GST returns prepared and filed on your two-monthly (or chosen) cycle
• Provisional tax planning with a clear payment schedule for the year
• Combined packages bundling GST, provisional tax, and year-end so it's one predictable cost

No hourly surprises, no "it took longer than expected" invoice. If a lighter touch suits you, we'll say so.

Book a free review

Book a free 20-minute review and we'll look at where you sit on GST, whether you need to register, and what your provisional tax is likely to do this year. You'll leave with a clear picture and a fixed-fee quote, with no obligation.

This page is general information, not personalised tax advice. Thresholds and rates change and your situation may differ, so confirm with us or check ird.govt.nz. In plain English: cross $60,000 turnover and GST is compulsory; clear $5,000 of residual tax and provisional tax begins, so we plan both so the bills never blindside you.