When VAT isn’t what it seems: reverse charge, registration traps, and why you might already be liable

It started, as many VAT issues do, with a perfectly reasonable question.

A UK-based digital agency had just received an invoice from a Spanish supplier. It looked simple enough — design services delivered remotely, no VAT applied. The agency’s finance director got in touch:

“Should they have charged us VAT? Or are they doing something wrong?”. The answer: no VAT should have been charged. But the issue wasn’t with the supplier. It was with the recipient.

They had just breached the UK VAT registration threshold — not because of their sales, but because of services they had purchased from abroad. And that’s where the story begins.

The misunderstood rule: reverse charge inclusion
Under UK VAT law, when a UK business — even one that is not VAT registered — receives services from a non-UK supplier, it must treat those services as if it had supplied them itself.

This is known as the reverse charge inclusion rule. It ensures that services received from abroad are treated consistently with those sourced domestically, preventing any unintended VAT distortions.

If the service would have been taxable had it been supplied by a UK business, then the value of that imported service counts towards the £90,000 VAT registration threshold. Let’s break that down with a practical example.

Example: how Pinco Pallino Ltd exceeded the threshold
Imagine Pinco Pallino Ltd, a small unregistered UK company, purchases €50,000 worth of digital services from an Italian supplier.

The services are business-to-business and, if supplied by a UK company, would be standard-rated for VAT.

Pinco also makes £48,000 in domestic consultancy sales.

Although the company has never charged VAT, its taxable turnover for VAT purposes is:

£43,000 (GBP equivalent of the €50,000 in EU services), plus £48,000 (UK consultancy revenue)
= £91,000 total taxable turnover

This places Pinco above the UK VAT registration threshold, meaning it is required by law to register for VAT.

This rule is particularly relevant to businesses purchasing services such as web design, advertising, SEO, hosting, and consultancy from overseas suppliers.

The VAT threshold: what counts
The VAT registration threshold, currently set at £90,000, is assessed on a rolling 12-month basis. Many assume it applies per calendar year or tax year, but HMRC looks at every rolling 12-month period. This means the threshold can be exceeded at any point in the year, triggering the requirement to register from the following month.

Taxable turnover includes:

UK sales that are standard-rated, reduced-rated or zero-rated,
reverse charge services received from non-UK suppliers (if they would be taxable in the UK),
and relevant supplies made within the UK under domestic VAT rules.

Businesses must actively monitor these figures to remain compliant, particularly where the reverse charge is in play.

Domestic reverse charge: a different obligation
The reverse charge also applies within the UK in certain sectors. If you operate in construction (under CIS), wholesale telecoms, or trade in certain goods like mobile phones or emissions allowances, you may be required to issue or receive reverse charge invoices.

For example, in construction, subcontractors must not charge VAT when invoicing contractors, provided the supply qualifies. Instead, the invoice should clearly state:

“Reverse charge: customer to account for VAT to HMRC.” Incorrect invoicing or omission of the required wording can lead to administrative issues, delayed payments, or disallowed input VAT.

The role of proper compliance
The complexities of VAT registration and reverse charge compliance are not always immediately apparent, especially in fast-growing or internationally connected businesses.

At Vectigalis Tax, we work closely with clients to review their operations and ensure that VAT is applied and reported correctly — whether you’re approaching the threshold or already registered. Our advisory services include:

assessing whether VAT registration is required (including reverse charge inclusion),
preparing or reviewing VAT returns involving domestic and cross-border transactions,
correcting past omissions through voluntary disclosures to HMRC,
and advising on correct invoicing practices in line with UK and international VAT rules.

Staying on the right side of VAT rules
Reverse charge mechanisms are designed to ensure a level playing field between domestic and cross-border services. However, they also carry reporting and registration obligations that can affect businesses earlier than expected — particularly those with overseas suppliers.

If you’re working with non-UK contractors or suppliers and haven’t reviewed your VAT exposure recently, it may be worth conducting a threshold assessment. This allows businesses to plan, register if needed, and ensure that records and invoicing remain fully compliant.

For tailored advice or to book a VAT review, contact angelo@vectigalistax.co.uk or visit www.vectigalistax.co.uk. We’re here to support your business as it grows across borders.