HMRC letter

An HMRC letter should never be ignored. Some letters are routine, such as tax-code notices or requests for extra information. Others may relate to overdue tax, a late return, VAT queries, PAYE records, a Corporation Tax review, undeclared income or a formal compliance check.

The right response depends on what the letter says, the tax involved and the deadline given. Acting quickly can reduce stress, protect your appeal rights and help prevent a small issue becoming a larger tax, penalty or debt-collection problem.

For UK company directors, sole traders, landlords, freelancers and growing businesses, the most important first step is simple: slow down, check whether the letter is genuine, identify the issue and gather the correct records before responding.

First: check whether the HMRC letter is genuine

Fraudsters often copy HMRC wording to create convincing letters, emails, text messages and calls. Before you provide information or make a payment, check the letter carefully.

• Look for the tax reference, date, subject line and department named in the letter.
• Check whether the letter matches a genuine HMRC contact campaign listed by GOV.UK.
• Be cautious if the letter pressures you to pay immediately to unusual bank details.
• Do not use contact details blindly if the letter looks suspicious.
• Do not share bank details, passwords or Government Gateway security codes in response to suspicious contact.
• Use your HMRC online account or known official HMRC contact route to verify the issue where appropriate.

If the letter is genuine, the next step is to understand whether it is asking for information, requesting payment, notifying you of a penalty, correcting a tax position, or opening a compliance check.

Common types of HMRC letters

HMRC letters vary, but many fall into a few broad categories:

What to do when you receive an HMRC letter

1. Read the letter carefully

Identify the tax involved, the period covered, the reference number, the deadline and exactly what HMRC is asking you to do. Do not assume all HMRC letters mean you owe money. Some are information requests, coding notices, repayment checks or compliance-review letters.

2. Check the deadline

Many HMRC letters include a specific response date. Missing a deadline can reduce your options, increase penalties or lead to escalation. If you need more time, it is usually better to contact HMRC or ask your accountant to help before the deadline passes.

3. Do not guess the answer

If HMRC asks for figures, documents or an explanation, guessing can make the situation worse. Check the accounting records, tax returns, bank statements, invoices, payroll reports or VAT records before responding.

4. Gather the right documents

The documents you need will depend on the letter. Common examples include:

• Tax returns and submitted calculations.
• Company accounts and Corporation Tax computations.
• VAT returns and Making Tax Digital records.
• Payroll reports, FPS submissions and PAYE account records.
• Sales invoices, purchase invoices and receipts.
• Bank statements and payment confirmations.
• Dividend paperwork, director loan records and expense claims.
• Previous correspondence with HMRC.

5. Decide whether you need professional help

You may be able to respond yourself if the letter is simple and you understand the issue. Professional support is recommended where the letter involves a compliance check, a large tax bill, multiple years, missing records, VAT errors, PAYE discrepancies, a penalty appeal, or possible undeclared income.

What if the letter says you owe tax?

First, check whether the amount is correct. Match the letter to your tax account, submitted returns and payment records. Errors can happen where payments are allocated to the wrong reference, a return has not been processed, or HMRC is using estimated figures.

If the debt is correct but you cannot pay in full, do not ignore the letter. HMRC may be willing to consider a payment plan in suitable cases, but they will usually expect clear information about affordability, cash flow and future tax payments.

Businesses should review:

• What tax is owed and for which period.
• Whether the return behind the debt is correct.
• Whether any payments have been misallocated.
• Whether interest or penalties have been added.
• Whether future VAT, PAYE or Corporation Tax deadlines are also approaching.
• How much can realistically be paid immediately and monthly.

What if the letter is a compliance check?

A compliance check does not automatically mean you have done something wrong. It means HMRC is checking whether the right amount of tax has been paid, whether the correct allowances and reliefs have been claimed, or whether records support the submitted position.

If you receive a compliance-check letter:

• Read the scope carefully: which tax, period and issue is being checked?
• Do not send more information than is reasonably needed without reviewing the request.
• Keep copies of all documents provided to HMRC.
• Check whether your accountant or tax adviser should correspond with HMRC on your behalf.
• Respond accurately and on time.
• Review whether the check affects other tax periods or filings.

For businesses, compliance checks can involve Corporation Tax, VAT, PAYE, bookkeeping records, expenses, director transactions, payroll deductions or cross-border issues. A structured response can help reduce unnecessary back-and-forth and keep the review focused.

What if the letter is about Self Assessment?

Self Assessment letters may relate to missing tax returns, late filing penalties, payments on account, undeclared income, property income, capital gains, dividend income, tax code adjustments or repayment checks.

Check the relevant Self Assessment tax return and compare it with bank records, invoices, payslips, P60s, P45s, dividend vouchers, rental statements and any other income evidence. If HMRC has estimated income incorrectly, you may need to provide a clear explanation and supporting documents.

What if the letter is about VAT?

VAT letters can be time-sensitive. They may relate to VAT registration, late VAT returns, repayment claims, input tax evidence, output tax errors, Making Tax Digital records or inconsistencies between VAT returns and other information.

Before replying, reconcile sales, purchases, bank receipts, VAT return boxes and accounting software records. If an error is found, you may need to correct it through the right VAT error-correction method rather than simply changing the next return without explanation.

What if the letter is about PAYE or payroll?

PAYE letters may refer to missing submissions, late payments, employee tax codes, payroll discrepancies, Real Time Information submissions, employer deductions, benefits or construction industry issues.

Check your payroll reports, FPS and EPS submissions, employee payment dates, PAYE reference, HMRC account balance and payment allocation. Payroll issues can quickly affect employees, directors and HMRC debt records, so it is worth resolving them early.

What if the letter is about Corporation Tax?

Corporation Tax letters may query the CT600, company accounts, payment allocation, losses, associated companies, relief claims, director transactions or tax computation. Directors should not treat these letters as routine administration if HMRC is asking for a correction, disclosure or explanation.

Review the company accounts, Corporation Tax computation, CT600, payment history, associated company position, dividend records, director loan balances and any reliefs claimed. If the company is unsure whether the return is correct, professional advice should be taken before responding.

When should you contact an accountant?

You should consider asking an accountant for help if:

• The letter mentions a compliance check, enquiry or investigation.
• HMRC says tax is owed and you disagree with the amount.
• You have missing or incomplete records.
• The issue relates to VAT, PAYE, Corporation Tax or several tax years.
• The letter mentions penalties, interest or possible further action.
• You need help preparing a payment proposal.
• You are a non-UK resident director with UK company obligations.
• You are unsure whether the letter is genuine.

How Accusolve Accountants can help

Accusolve Accountants supports UK taxpayers, small businesses, company directors, startups and non-UK resident business owners with practical accounting, tax and compliance support. We are AAT AML supervised and can help you understand what an HMRC letter means before you respond.

Our support can include:

• Reviewing the HMRC letter and identifying the issue.
• Checking tax returns, accounts, VAT returns, payroll records and payment history.
• Helping gather documents and prepare a clear response.
• Reviewing whether the tax amount, penalty or deadline appears correct.
• Supporting Self Assessment, Corporation Tax, VAT and PAYE queries.
• Helping with bookkeeping clean-up where records are incomplete.
• Advising on next steps if you cannot pay HMRC on time.

If you have received an HMRC letter and are unsure what to do, early action is usually better than waiting. A clear review can help you respond properly, protect your position and reduce the risk of avoidable penalties or escalation.