Why HMRC VAT registration letters aren’t always a cause for concern

HMRC has recently launched a targeted campaign reviewing businesses whose total income reported on tax returns exceeds the UK VAT registration threshold of £90,000. As part of this initiative, HMRC is issuing letters suggesting that affected businesses may need to register for VAT.

Notably, these letters do not include contact details for HMRC, leaving many businesses uncertain about how – or whether – they need to respond.

While receiving a letter like this can be unsettling, it is important to understand what HMRC is actually reviewing and what action, if any, is required.

Total income vs taxable turnover

A key point that many businesses overlook is that HMRC’s letters are based on total income, not taxable turnover for VAT purposes. This distinction is critical.

Total income can include:

• Exempt income
• Income outside the scope of VAT
• One off receipts

VAT registration, however, is based only on taxable turnover – that is, income subject to VAT at the standard, reduced or zero rate.

As a result, many businesses receiving these letters may not need to take any action at all.

When there is nothing to worry about

For many businesses, HMRC’s letter can safely be treated as informational rather than actionable. In particular:

• If all your income is exempt from VAT, you cannot register for VAT, even if your turnover exceeds £90,000.
• Examples of exempt income include many financial, insurance, education and healthcare services.
• In these circumstances, there is no VAT registration requirement, and the letter can generally be disregarded.

That said, it is still sensible to obtain advice re VAT treatment of your income and retain evidence supporting your VAT treatment in case HMRC raises further questions.

When you do need to review your position carefully

For businesses making taxable or mixed supplies, HMRC’s campaign should act as a prompt to review your VAT position in detail. You should assess:

• Whether your taxable turnover alone exceeds the VAT registration threshold.
• Whether your taxable turnover has exceeded £90,000 (£85,000 before that) in any rolling 12 month period, not just your accounting year.
• Whether you may have crossed the threshold in a previous period, creating a historic obligation to register.

If your taxable turnover has exceeded the threshold, VAT registration is mandatory, and you are required to register immediately. Delays can lead to backdated VAT liabilities, interest and potential penalties.

If your income is all zero-rated, you can request HMRC for exemption from VAT registration.

Businesses can be caught out

This type of HMRC campaign highlights a common compliance risk: businesses often monitor total income annually but fail to carry out rolling 12-month VAT checks.

Additional complications can arise where:

• New income streams are introduced without reviewing VAT treatment.
• A previously exempt business begins making taxable supplies.
• Mixed supplies are incorrectly treated as fully exempt or outside scope.
• Zero-rated income is mistakenly assumed to be exempt.

Over time, these issues can result in VAT registration obligations being missed entirely.

Voluntary VAT registration

Even when a business’ turnover is below the VAT threshold, voluntary VAT registration can provide valuable advantages, such as enhancing credibility with clients, particularly when working with other VAT‑registered businesses, and enabling the business to reclaim VAT on eligible expenses. However, it also introduces important obligations, including charging VAT on VAT‑able sales, submitting VAT returns, and managing the additional administrative workload that comes with compliance. For these reasons, the decision to register voluntarily should be assessed on a case‑by‑case basis, taking into account the specific circumstances and needs of the business.

Key actions for businesses

This HMRC campaign serves as a timely reminder to:

• Understand the VAT treatment of every income stream, not just headline turnover.
• Clearly distinguish between taxable, exempt and outside the scope supplies.
• Monitor taxable turnover monthly on a rolling 12‑month basis.
• Review historic periods to identify whether a VAT registration obligation may already exist.
• Review whether voluntary VAT registration can be beneficial for the business or not

Taking proactive steps now can help avoid costly corrections later.

We’re here to help

If you have received an HMRC VAT registration letter or would like support reviewing your VAT position, Azets’ VAT specialists can help you assess your obligations, confirm the correct VAT treatment of your income, and guide you through any required next steps. Get in touch via the form below to discuss your circumstances.