HMRC Letter After PAYE Error: Who Pays the Difference — And What Happens If You Ignore It

Receiving an HMRC letter about a PAYE error is unsettling. Most people immediately ask: “This wasn’t my mistake — so why am I being charged?”

In the UK, PAYE errors are common. What matters is who HMRC holds responsible and what happens if the issue isn’t resolved.

What Is a PAYE Error?

A PAYE error occurs when the wrong tax amount is deducted during the year. This can happen due to:

• Incorrect tax code
• Employer payroll mistakes
• Delayed or missing information

HMRC often identifies these errors after the tax year ends, then issues a letter explaining the difference.

Who Pays the Difference?

Responsibility depends on the cause:

• Employer error: HMRC may pursue the employer in some cases.
• Incorrect tax code used: HMRC may seek repayment from the employee.
• Information not updated: Liability often falls on the individual.

Even when the error wasn’t intentional, HMRC may still request payment if they believe the tax was underpaid.

What Happens If You Ignore an HMRC PAYE Letter?

Ignoring the letter does not make the issue go away. In many cases, HMRC will:

• Issue reminders or updated demands
• Adjust future tax codes to recover the amount
• Add interest or penalties if delays continue

If the balance remains unresolved, the situation can escalate further.

If the issue isn’t resolved, HMRC may escalate the case. Read this before it gets worse: HMRC enforcement explained — when debt collectors, bailiffs, or wage deductions can begin .

Can You Dispute a PAYE Error?

Yes, but timing matters. You should:

• Review the tax year and amounts HMRC refers to
• Check payslips and P60/P45 documents
• Respond promptly if information appears incorrect

Delays often reduce available options and can trigger recovery through tax code changes.

PAYE Error vs Simple Assessment

• PAYE error: underpayment identified after payroll deductions
• Simple Assessment: formal HMRC calculation requesting payment

Both can lead to repayment requests and escalation if ignored.

What to Do Now

1. Read the HMRC letter carefully and confirm the tax year.
2. Check whether the error came from payroll, tax code, or missing updates.
3. Act early — unresolved PAYE issues often escalate quietly.

Disclaimer: This article is for general information only and does not constitute legal or tax advice. Individual circumstances vary.