Written by the TaxTune Editorial Team · Reviewed by our qualified accountants · Updated for 2026
The quick answer You must register for VAT once your taxable turnover passes £90,000 in any rolling 12 month period, or if you expect to pass it in the next 30 days. You register online with HMRC, receive a VAT number, then start charging VAT and filing returns through Making Tax Digital software.

How to register, step by step

  1. Check whether you must register. Add up your taxable turnover for the last 12 months on a rolling basis. If it is over £90,000, or you expect to cross it within 30 days, registration is compulsory.
  2. Decide if voluntary registration suits you. Below the threshold you can still register, which lets you reclaim VAT on costs and can look more established to clients.
  3. Register online with HMRC. Provide your business details, turnover and bank details. Most registrations are done through your business tax account.
  4. Choose your scheme. Standard, Flat Rate or cash accounting. The right one depends on your costs and customers.
  5. Start charging and filing. Once your VAT number arrives, charge VAT on your sales, keep digital records, and file returns through compatible software.

Common mistakes

  • Registering late. You must monitor the rolling 12 month figure, not just the tax year. Late registration means paying VAT you never charged.
  • Forgetting the forward look test. If you land a big contract that will tip you over within 30 days, you must register straight away.
  • Picking the wrong scheme. The Flat Rate Scheme suits some businesses and costs others money.

Near the threshold?

Registering at the right moment, on the right scheme, can save you money and stress. TaxTune monitors your turnover, registers you on time, and sets you up so the first return is straightforward.

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Frequently asked questions

When do I have to register for VAT?

Once your taxable turnover passes £90,000 in any rolling 12 month period, or if you expect to pass it in the next 30 days. Registration is then compulsory and must be done promptly.

Can I register for VAT voluntarily?

Yes. Below the £90,000 threshold you can register voluntarily, which lets you reclaim VAT on business costs and can suit businesses selling to other VAT registered firms.

How long does VAT registration take?

Many registrations are processed within a couple of weeks, though it can take longer. You should keep records and prepare to charge VAT from your effective date even before the number arrives.

What happens after I register?

You charge VAT on your sales, keep digital records under Making Tax Digital, and file VAT returns through compatible software, usually every quarter.

What if I register late?

You are still liable for the VAT from the date you should have registered, even if you did not charge it to customers. HMRC can also charge penalties, so monitoring turnover matters.