GST De-registration Calculator NZ 2026

This calculator works out the GST you'll owe on the final return when you cancel your GST registration, so you know the cash impact before you apply to de-register. Under the GST Act 1985, any business assets you keep are treated as sold to yourself at market value, and you must pay output tax on that deemed supply. Start by selecting why you're de-registering (turnover has dropped below $60,000, you've stopped trading, a restructure, or another reason) and entering your current annual turnover, so the tool can flag whether you're eligible. Then enter the open market value of assets you're retaining, GST inclusive, across vehicles, equipment and tools, inventory, office furniture and technology, land and buildings, and any other assets, plus your GST accounting basis and outstanding debtors if you're on the payments or hybrid basis. The calculator returns an eligibility check, a line by line table showing each asset's market value and the GST charged at 3/23, and the total output tax you must include in your final return, along with next steps for notifying Inland Revenue and paying what's owed. Use it before you apply to cancel your registration, particularly if you're keeping vehicles, equipment or property, since the deemed supply can be a larger bill than expected. Figures are indicative only; get a market valuation for distinctive assets and confirm your position with IRD or an accountant.

Updated  Implements section 5(3) of the GST Act 1985 (deemed supply on cancellation of registration).
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Eligibility check

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Assets to be retained at de-registration (market values, GST inclusive)

Enter the open market value of each asset category that you will keep after de-registration. Use depreciated book value if it reasonably reflects market value.

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Land may be subject to compulsory zero-rating in some circumstances. If transferring to another GST-registered party, see the Zero-Rated Supply Checker.
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Outstanding amounts at de-registration

Payments basis users have GST owing on outstanding debtors at de-registration. Invoice basis users have already paid the GST on debtors when the invoices were issued.
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Only included in the final return calculation if you are on the payments or hybrid basis. Invoice basis users have already accounted for this GST.

Why de-registration triggers GST

When you originally bought business assets, you claimed back the GST as input tax. The de-registration rules ensure that you can't keep those assets for personal use without effectively paying back the GST. The mechanism is a "deemed supply": the GST Act treats you as having sold the assets to yourself at market value on the date of de-registration. You pay output tax on this deemed sale in your final return.

When you can de-register

  • Turnover below $60,000: If your taxable supplies dropped below the registration threshold and will stay there, you can voluntarily de-register.
  • Ceased taxable activity: You MUST de-register within 21 days if you've stopped taxable activity and won't restart within 12 months.
  • Sold business: The sale of the business as a going concern is typically zero-rated, but you still need to de-register after the sale.

Calculating the final return

Three components go in your final return:

  1. Normal sales and purchases for the final taxable period up to the de-registration date.
  2. Deemed supply on retained assets at open market value × 3/23.
  3. Outstanding debtors if you were on the payments basis (pay GST as though invoices had been paid).

Sources

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Frequently asked questions

When can I de-register from GST in NZ?

You can apply to cancel your GST registration if your turnover has dropped (and is expected to remain) below the $60,000 threshold, you have stopped your taxable activity, or you sold or closed your business. You MUST cancel your registration within 21 days if you stop your taxable activity and don't intend to start a new one within 12 months. If your turnover stays above $60,000 you cannot de-register.

Do I owe GST when I de-register?

Yes. The GST Act treats any business assets you keep at de-registration as if you sold them to yourself at open market value. You must pay GST output tax on this 'deemed supply' in your final GST return. This includes vehicles, equipment, inventory, and even land or buildings used in the business. The rule prevents you from claiming GST on a business asset purchase and then keeping it for private use after de-registering.

How is the deemed supply value calculated?

The deemed supply is calculated at open market value (the price the asset would fetch if sold to an independent third party at the de-registration date), and the output tax is 3/23 of that market value. You can value at depreciated book value if it reasonably approximates market value, but for distinctive assets (vehicles, real estate) get a market valuation. Assets with no business use at de-registration (you've already disposed of them or written them off) are not part of the deemed supply.

What happens if I miss the 21-day de-registration window?

You remain GST-registered and must keep filing returns. You may have to pay GST on any payments you collect for past taxable activities even if you're no longer trading. IRD can also back-date your de-registration to the actual date you ceased taxable activity, which may trigger interest and penalties on the deemed supply tax that should have been paid then. Best practice: notify IRD via myIR within 21 days of stopping your taxable activity.