VAT Threshold UK: HMRC’s New Campaign Explained

HMRC has recently begun contacting businesses whose reported income exceeds the £90,000 VAT threshold. At first glance, these letters can be worrying, particularly as they suggest that VAT registration may be required but do not provide a clear way to discuss the position.

The important point, however, is that these letters are based on total income rather than taxable turnover. For VAT Threshold UK, this distinction is crucial. Many businesses receiving these letters will not actually need to register — but they do need to understand why.

If you want a broader, practical overview of UK VAT beyond the threshold rules, see our guide “VAT UK 2026: A Professional Guide for Businesses Operating with the United Kingdom”.

VAT Threshold UK: Why Total Income Is Not the Right Measure

One of the most common misunderstandings around VAT is assuming that all income counts towards the registration threshold. In reality, VAT rules are more specific.

Total income simply reflects everything a business earns. Taxable turnover, by contrast, only includes income that is subject to VAT (even if the rate is 0%). This means that certain types of income — particularly exempt income — are excluded entirely from the calculation.

As a result, it is entirely possible for a business to have income above £90,000 and still fall outside the scope of VAT registration. This is why HMRC’s letters can sometimes be misleading if taken at face value.

VAT Threshold UK: Understanding What Is VATable

To assess whether registration is required, businesses need to look closely at the nature of their income rather than the total figure.

Most straightforward trading income will count. If you are selling goods or providing services that are subject to VAT, those amounts form part of your taxable turnover. This includes not only standard-rated income but also zero-rated supplies, which still count even though VAT is charged at 0%.

Where it becomes less obvious is with more complex or indirect income streams.

A good example is commission or service-based income, which is often standard-rated and therefore included in the threshold calculation. Many businesses underestimate how quickly these smaller income streams can accumulate.

VAT Threshold UK: Reverse Charge Transactions Explained

One area that is frequently overlooked — and increasingly relevant — is the treatment of overseas suppliers.

If your business purchases services from outside the UK, such as software subscriptions, marketing services, or consultancy, the reverse charge mechanism may apply. In simple terms, this means you account for VAT as if you had supplied the service yourself.

From a cash perspective, this often has no immediate impact, as the VAT is both declared and reclaimed. However, from a VAT Threshold UK perspective, the value of these services can still be relevant when assessing your taxable turnover.

This is particularly important for modern businesses that rely heavily on international providers. It is easy to overlook these costs because no VAT invoice is received in the usual way, yet they can still influence whether the registration threshold is exceeded.

VAT Threshold UK: Income That Does Not Count

Not all income is relevant for VAT purposes, and this is where many businesses gain reassurance after reviewing their position.

Exempt income — such as certain financial services, insurance-related income, or specific types of education and healthcare — does not count towards the VAT threshold. If a business only makes exempt supplies, it generally cannot register for VAT at all.

There are also categories of income that fall completely outside the scope of VAT, such as some grants or genuine reimbursements. These should also be excluded when assessing whether the threshold has been exceeded.

Understanding these distinctions is essential, particularly for businesses with varied income streams.

VAT Threshold UK: The Importance of the Rolling 12-Month Test

Another key point that is often misunderstood is how the threshold is measured.

The £90,000 limit is not based on your accounting year or tax year. Instead, it is calculated on a rolling 12-month basis. This means that at the end of each month, you should look back over the previous 12 months and total your taxable turnover.

If that figure exceeds £90,000 at any point, the requirement to register arises immediately.

In practice, this means businesses cannot rely on year-end reviews alone. A gradual increase in turnover during the year can trigger a registration obligation earlier than expected, particularly if it is not being monitored regularly.

VAT Threshold UK: What to Do If You Receive an HMRC Letter

Receiving a letter from HMRC should be seen as a prompt to review your position rather than an automatic indication that something is wrong.

The first step is to break down your income and identify which elements are taxable, exempt, or outside the scope of VAT. From there, you can calculate your taxable turnover over the last 12 months and determine whether it exceeds the threshold.

It is also important to consider less obvious areas, such as reverse charge transactions, which may not be immediately visible in your headline figures.

In many cases, the conclusion will be that no registration is required. But having that conclusion supported by a clear review is key.

VAT Threshold UK: Final Thoughts

HMRC’s campaign highlights an important reality: VAT compliance is not just about how much your business earns, but how that income is treated.

For some businesses, these letters will have no practical impact. For others, they may reveal that a registration obligation has already arisen.

Either way, taking the time to understand your VAT position — particularly around areas like reverse charge transactions and mixed income — is essential.

If you are unsure, a short review now can prevent more complex issues later.