When Do You Need to Register for VAT?

The compulsory registration threshold

A UK business must normally register for VAT when its VAT-taxable turnover for the previous rolling 12 months exceeds £90,000. This is a rolling test, not a test based only on the tax year, calendar year or company year.

Check the total at the end of every month. If the rolling taxable turnover goes above the threshold, the business normally has 30 days from the end of that month to tell HMRC, and the effective registration date is usually the first day of the second month after the month the threshold was exceeded. For example, exceeding it in July normally gives an effective date of 1 September.

The next-30-days test

A separate forward-looking rule can apply if the business expects taxable turnover to exceed £90,000 in the next 30 days alone. A large new contract or order can therefore trigger registration without waiting for the historic rolling total.

What counts as taxable turnover

Taxable turnover generally includes supplies that would be standard-rated, reduced-rated or zero-rated if the business were registered. Exempt income and income outside the scope of VAT are treated differently. Zero-rated sales can still count toward the registration threshold.

The classification of income can be technical. Businesses near the threshold should confirm which sales count rather than relying on a software category name.

Voluntary registration

A business can register before it is required to. Voluntary registration can help where customers are VAT-registered and can reclaim VAT, or where the business has significant input VAT on costs. It may be commercially less attractive where customers cannot reclaim VAT and the business cannot increase prices.

Registration also creates record-keeping, invoicing, return and payment responsibilities, including Making Tax Digital for VAT for most registered businesses.

What changes after registration

• Apply VAT correctly from the effective registration date.
• Issue valid VAT invoices and display the VAT number.
• Keep the required digital VAT records.
• Submit VAT returns and pay amounts due on time.
• Reclaim input VAT only where the rules and evidence allow it.
• Review contracts and prices so the VAT cost is understood.

Common mistakes

• Checking turnover only once a year.
• Monitoring profit instead of taxable sales.
• Excluding zero-rated sales from the threshold without checking.
• Charging VAT before registration or mishandling the effective date.
• Registering voluntarily without reviewing customer pricing.
• Waiting for the accountant to notice the threshold after it has been crossed.

Monthly VAT threshold check

1. Calculate VAT-taxable turnover for the latest rolling 12 months.
2. Identify expected large sales in the next 30 days.
3. Check the VAT liability of unusual income.
4. Review pricing and customer impact.
5. Make sure your system can produce digital VAT records.
6. Register or seek advice promptly when a test is met.