Tax code warning as Chancellor hikes late filing charges

HMRC is urging both workers and retirees to double-check their tax codes at the start of the tax year to avoid potential issues.

In recent emails to taxpayers, HMRC outlined four key reasons why a tax code might be incorrect.

  • These include:

  • Changing jobs

  • Pay adjustments

  • Alterations to workplace benefits, such as changes to a company car

  • Pension updates

An incorrect tax code can result in either overpaying or underpaying tax.

While overpayment reduces monthly income, it can eventually lead to a welcome refund from HMRC.

Underpayment, on the other hand, can be far more problematic—particularly if a significant amount is owed.

How to check your tax code

Start by locating your tax code on your payslip, P60, or pension advice slip if you're retired.

You can then use the Government’s income tax checker tool to verify whether your code is accurate.

Self-employed individuals should contact HMRC directly, as the self-assessment system isn’t compatible with the checker tool.

Understanding tax codes

Tax codes provide insight into how your income is taxed. Key indicators in the code include:

L – for employees entitled to the standard personal allowance

S – for individuals with a main residence in Scotland

BR/SBR – used for secondary income sources, such as additional jobs or pensions

M – for those whose spouse or civil partner has transferred part of their personal allowance

Chancellor increases penalties for late tax returns

Chancellor Rachel Reeves has announced an increase in penalties for late tax return submissions, aiming to raise over £1 billion in additional revenue for the Treasury.

Late filings will now incur a 3% charge on tax owed if submitted 15 days late—up from 2%. This rises to 10% after 31 days, a significant jump from the previous 4%. In 2024, over one million people missed the self-assessment deadline, HMRC reports.

Keeping your tax paperwork accurate and submitted on time is essential.

Though the process can be complex and time-consuming, collaborating with a financial adviser and accounting professionals can help you stay on track and avoid costly mistakes.

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