HMRC Issues New Tax Codes to Recover Old Unpaid Debts

HMRC Issues New Tax Codes to Recover Old Unpaid Debts
Charlotte Baroukh

Charlotte Baroukh

Tax Expert @ Pie

3 min read

Updated: 29 Dec 2025

3 min read

Updated: 29 Dec 2025

HM Revenue and Customs (HMRC) has begun implementing new tax codes for individuals with outstanding tax debts, in a move designed to recover unpaid amounts through adjustments to employees’ pay. The changes, which came into effect in the latest tax year, target old debts that remain unsettled.


This development is part of HMRC’s ongoing efforts to manage tax collection and address historical debt efficiently. Understanding the impact of these changes is essential for taxpayers who may see alterations to their net pay and for employers responsible for payroll compliance.

Overview of Recent HMRC Changes

HMRC has adjusted tax codes for certain individuals, allowing for the collection of unpaid tax debts via the Pay As You Earn (PAYE) system. Taxpayers affected may notice a change on their payslips, reflecting deductions that go towards settling outstanding amounts.


According to official guidance, this approach applies to tax debts from previous years that have not yet been repaid. The tax authority periodically reviews taxpayer records to identify outstanding balances.


By amending tax codes, HMRC can incrementally recover these debts over the course of the tax year, minimising the risk of large one-off payments.

Background on Tax Debt Collection

Historically, HMRC has relied on a range of mechanisms to recover unpaid taxes, including direct demands and formal repayment plans. The adjustment of tax codes for debt recovery is not unprecedented but has become more streamlined in recent years, as part of efforts to improve collection rates and reduce administrative burdens.


This method of using tax codes as a tool for debt collection ensures a structured and predictable process for both HMRC and affected individuals. The policy is particularly aimed at preventing the accumulation of long-term arrears, thereby protecting public revenue.

How Unpaid Debts Are Recovered

When a tax debt is identified, HMRC may issue a new tax code instructing employers to increase deductions from employees’ wages. The amount collected is then passed directly to HMRC.


The incremental deductions spread the burden across the tax year, rather than requiring immediate lump-sum repayment. Individuals will usually be notified by HMRC in advance of any changes to their tax code.


Detailed explanations are typically provided in correspondence, and taxpayers are encouraged to review their code notices carefully to ensure they understand the changes.

Implications for Affected Taxpayers

For those subject to the new tax codes, monthly pay may be slightly reduced until the debt is cleared. The precise impact depends on the individual’s salary and the amount owed.


HMRC provides detailed breakdowns in code notices, enabling taxpayers to track how much is being repaid each month. Employers are required to implement the new codes promptly and ensure systems are updated.


Failure to apply the correct code may result in further liabilities or penalties for both employers and employees.

Official Reactions and Guidance

The approach has received attention from financial advisers and payroll specialists, who emphasise the importance of checking tax code notifications regularly. HMRC’s official advice is for all taxpayers to review their online accounts or written communications at the start of each tax year.


Chancellor Jeremy Hunt has previously commented on the government’s commitment to reducing tax debt and enhancing collection efficiency, stating, ‘Robust debt management is vital for the integrity of the tax system.’

Final Summary

HMRC’s decision to recover old unpaid tax debts through new tax code adjustments marks a significant step in managing historic liabilities. The policy aims to simplify the repayment process and provide predictability for both employees and employers.


Affected taxpayers should monitor their payslips for changes, review any official correspondence carefully, and contact HMRC with any concerns. By remaining attentive to these updates, individuals can avoid unexpected deductions or penalties.


For those managing multiple tax codes or seeking clarity on their tax position, tools such as the Pie app may prove helpful for staying organised.

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