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05

VAT: when you have to register

VAT registration isn't optional once you cross the line, and the line moves with you every month.

Part 5 of 6 · Last checked (2026/27 tax year)

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The £90,000 threshold: two tests

  • Looking back: your VAT-taxable turnover for any rolling 12 months goes over £90,000. Check at the end of every month, not just at your year end.
  • Looking forward: you expect turnover in the next 30 days alone to go over £90,000.

You have 30 days to register

Under the looking-back test, register within 30 days of the end of the month you went over. Under the looking-forward test, register by the end of that 30-day period.

Registering late

If you register late, HMRC will backdate your registration. You owe VAT on sales from the date you should have registered, even if you never charged it to your customers, and you may face a penalty too.

Registering voluntarily

ProsCons
Reclaim VAT on your costsPrices rise by 20% for customers who can't reclaim VAT
Can look more established to bigger clientsMore admin and filing deadlines

Digital records and quarterly returns

Once registered, you must keep digital VAT records and file returns with compatible software under Making Tax Digital. Most businesses file every quarter.

Quick answers

What is the VAT registration threshold?

£90,000 of VAT-taxable turnover. You must register if turnover for any rolling 12 months goes over it, or if you expect turnover in the next 30 days alone to go over it.

How long do I have to register for VAT?

Under the looking-back test, within 30 days of the end of the month you went over. Under the looking-forward test, by the end of that 30-day period.

What happens if I register for VAT late?

HMRC backdates the registration. You owe VAT on sales from the date you should have registered, even if you never charged it, and you may face a penalty.

Should I register for VAT voluntarily?

It lets you reclaim VAT on costs and can look more established, but prices rise by 20% for customers who cannot reclaim VAT and there is more admin.

Video transcript

Read what's said in the part 5 video

Part five: VAT. When do you have to register?

One: the test. You must register if your VAT-taxable turnover goes over £90,000 in any rolling twelve months, not just your tax year. Or if you expect to go over it in the next thirty days alone.

Two: the deadline. Register within thirty days of the end of the month you went over. Register late, and you'll owe VAT on sales since you should have registered, and maybe a penalty.

Three: under the threshold, it's your choice. Registering lets you reclaim VAT on costs, but you'll usually add 20% to your prices, which matters if you sell to the public.

Four: once registered, charge VAT, keep digital records and file returns with compatible software, usually every quarter.

This is general information, not advice. Follow for part six: where limited liability stops.

General information only. Hello Newco covers companies registered in England and Wales. It is not legal, tax or financial advice, so please don't rely on it for your own decisions: check GOV.UK or speak to a qualified adviser. To the extent the law allows, we accept no liability for anything done or not done on the strength of it. Our video voiceovers and visuals are made with AI. Figures checked November 2026 (2026/27 tax year).

Next: part 6

Where limited liability stops