HMRC tax loss notification letters: guidance for businesses

A tax loss notification letter is a serious HMRC communication. Businesses should read the letter carefully, identify the transactions and periods concerned, preserve all relevant documents and consider whether specialist support is required.

This page provides educational guidance on common record and evidence issues arising from HMRC tax loss notifications, including VAT records, supplier and customer checks, transport evidence, payment records and business correspondence.

The purpose is not to encourage confrontation with HMRC. The purpose is to help businesses understand HMRC’s concerns, organise evidence and respond clearly and responsibly.

• Purchase and sales invoices.
• Bank payments and payment trails.
• Supplier and customer checks.
• Companies House, VAT number and director checks where relevant.
• Transport, delivery and export evidence.
• Written explanations of commercial purpose and transaction flow.

What a tax loss notification letter may indicate
Why records and evidence matter
VAT fraud and due diligence issues
Supplier and customer checks
How to respond constructively
When specialist support may be required

What a Tax Loss Notification Letter May Indicate

A tax loss notification letter may indicate that HMRC has identified concerns about a business’s tax position, trading activities or the information available to them. Receiving a letter does not necessarily mean wrongdoing has occurred, but it may suggest that HMRC expects further explanation, supporting evidence or clarification regarding specific transactions or tax treatments.

Why Records and Evidence Matter

Accurate records and supporting evidence play a vital role when responding to HMRC enquiries. Businesses should be able to demonstrate how transactions were conducted, how tax treatments were determined and why decisions were made. Well-maintained records can help support explanations and reduce uncertainty during any review process.

VAT Fraud and Due Diligence Issues

Some tax loss notification letters may arise where HMRC believes transactions could be connected to VAT fraud risks or supply chain concerns. In such cases, businesses may be expected to demonstrate the due diligence procedures they have undertaken and provide evidence showing how commercial risks were assessed and managed.

How to Respond Constructively

Businesses should carefully review any correspondence received, understand the issues being raised and respond within any stated deadlines. Providing clear explanations, relevant records and supporting evidence can help HMRC understand the circumstances and may assist in resolving concerns more efficiently.

When Specialist Support May Be Required

Where significant sums are involved, technical issues arise or allegations of VAT fraud are being considered, businesses may benefit from obtaining specialist support. Professional advice can help clarify HMRC’s concerns, review available evidence and assist with preparing a comprehensive response.