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VAT in the UK: A complete guide to registration: thresholds, voluntary registration and exemptions

Many business owners in the UK ask the same question: When do I need to register for VAT, and can I avoid it?

It’s an important issue because failing to register on time could result in having to pay backdated VAT, interest, and financial penalties.

Whether you’re self-employed, running a limited company, or selling products and services online, understanding how VAT works is essential for staying compliant and avoiding costly mistakes.

VAT rules are set by HM Revenue & Customs (HMRC).

Official HMRC guidance:
https://www.gov.uk/register-for-vat

What is the VAT registration threshold in the UK in 2026?

The key figure every UK business owner should know is £90,000.

If your VAT taxable turnover exceeds £90,000 over any rolling 12-month period, you must register for VAT.

This threshold has been in place since 1 April 2024 and remains unchanged for 2026.

The Rolling 12-Month Rule

HMRC does not look at the tax year or calendar year when determining whether you need to register for VAT.

Instead, it uses a rolling 12-month period, meaning you should review your turnover at the end of every month by looking back over the previous 12 months.

If your taxable turnover exceeds £90,000, you must:

  • notify HMRC within 30 days of the end of the month in which you exceeded the threshold
  • apply for VAT registration
  • begin charging VAT from your Effective Date of Registration

Effective Date of Registration (EDR) – When do you start charging VAT?

If you exceed the VAT threshold, HMRC will assign an Effective Date of Registration (EDR).

In most cases, this is:

The first day of the second month after the month in which you exceeded the VAT threshold.

Example

  • VAT threshold exceeded: 12 May
  • End of the month: 31 May
  • Deadline to notify HMRC: 30 June
  • Effective Date of Registration: 1 July

From 1 July, you must charge VAT on applicable sales.

Can you register for VAT voluntarily?

Yes.

You can register for VAT before reaching the £90,000 threshold.

This is known as voluntary VAT registration.

It may be beneficial if you:

  • mainly work with VAT-registered businesses
  • have significant business expenses and want to reclaim VAT on purchases
  • want to improve your company’s professional image

However, becoming VAT registered also means taking on additional responsibilities.

VAT-registered businesses must:

  • maintain VAT records
  • submit VAT Returns
  • comply with Making Tax Digital (MTD) for VAT

HMRC guidance:
https://www.gov.uk/guidance/making-tax-digital-for-vat

Exception from VAT Registration – Can you avoid registering?

In some situations, you may be able to apply for an Exception from VAT Registration.

This may be possible if:

  • exceeding the VAT threshold was only temporary
  • you can demonstrate that your taxable turnover will fall below the deregistration threshold over the following 12 months

The current VAT deregistration threshold is £88,000.

To apply for an exception, you must submit a request to HMRC together with evidence supporting your expected future turnover.

More information:
https://www.gov.uk/register-for-vat/when-to-register

What counts towards VAT taxable turnover?

To monitor your VAT threshold correctly, it’s important to understand which sales count towards your taxable turnover.

These generally include:

  • sales of goods and services subject to 20%, 5% or 0% VAT
  • online sales to UK customers
  • services supplied within the UK

Some transactions are VAT exempt or outside the scope of VAT and therefore do not count towards the £90,000 registration threshold.

For a full list of VAT rates, visit:

https://www.gov.uk/vat-rates

The risks of registering late for VAT

Failing to register for VAT on time can have significant financial consequences.

HMRC may:

  • charge VAT retrospectively from your Effective Date of Registration
  • impose penalties for failing to register
  • charge interest on unpaid VAT

In practice, this could mean paying VAT out of your own pocket if you did not charge it to your customers.

Frequently Asked Questions

What is the standard VAT rate in the UK?

The standard VAT rate is 20%.

Reduced rates of 5% and 0% also apply to certain goods and services.

Is the £90,000 threshold based on profit?

No.

The threshold is based on taxable turnover, meaning your total sales before deducting expenses.

Does every self-employed person need to register for VAT?

No.

VAT registration only becomes mandatory once you exceed the registration threshold, unless you choose to register voluntarily.

How do I register for VAT?

VAT registration is completed online using the HMRC VAT Registration Service:

https://www.gov.uk/register-for-vat

Summary

VAT is one of the most important taxes for businesses operating in the UK.

The key rules to remember are:

  • The VAT registration threshold is £90,000 of taxable turnover.
  • HMRC applies the rolling 12-month rule.
  • You can register voluntarily before reaching the threshold.
  • In certain circumstances, you may qualify for an Exception from VAT Registration.

Regularly monitoring your turnover and understanding your VAT obligations will help you avoid unnecessary tax liabilities, penalties, and unexpected costs while keeping your business fully compliant with HMRC.