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UK Taxpayers Urged to Check Tax Codes After Bank Errors

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  Published in Business and Finance on Friday, January 9th 2026 at 6:08 GMT by The Independent

Friday, January 9th, 2026 - Millions of UK taxpayers are being urged by HM Revenue & Customs (HMRC) to review their tax affairs following the discovery of data reporting errors originating from several major banks and building societies. The issue potentially impacts individuals with savings accounts, Individual Savings Accounts (ISAs), or those who receive dividend income, with an estimated 2.1 million people potentially affected.

The root of the problem lies in inaccuracies within the information submitted by financial institutions - including prominent names like Lloyds, Barclays, Halifax, NatWest, and HSBC - to HMRC regarding interest earned on savings and dividends paid. These errors can lead to incorrect tax codes being assigned to individuals, ultimately resulting in either overpayment or underpayment of income tax. HMRC has confirmed they were alerted to the issue and are actively working with the banks to rectify the mistakes.

Understanding Tax Codes and Their Importance

Tax codes are crucial components of the UK tax system, designed to automatically calculate the correct amount of income tax deducted from wages and pensions throughout the year. A correctly assigned tax code takes into account personal allowances, any benefits received, and other factors that influence an individual's tax liability. When a tax code is inaccurate, it throws this calculation off balance, potentially leading to financial discrepancies for taxpayers.

"The implications of an incorrect tax code can be significant," explains Sarah Jenkins, a tax consultant at AccountWise. "If your tax code understates your allowances, you'll likely pay too much tax throughout the year and may be entitled to a refund. Conversely, an overstated allowance could mean you haven't paid enough tax, leaving you with a bill to settle."

What You Need to Do - and the Deadline

HMRC is strongly advising all taxpayers to proactively check their tax codes. Several avenues are available to do so:

• Payslips: Your tax code is typically printed directly on your payslip.
• P60: This end-of-year tax summary, provided by your employer, also displays your tax code.
• HMRC Online Account: The most convenient method is to sign in to your personal tax account on the HMRC website ([ https://www.gov.uk/personal-tax-account ]). This provides a detailed overview of your tax record, including your current tax code and any adjustments made.

If, upon review, you suspect your tax code is incorrect, HMRC urges you to contact them immediately. The deadline to report these potential errors is January 31st, 2026. While HMRC states they are working with banks to resolve the issue, they emphasize the importance of individual verification. The sooner taxpayers report discrepancies, the quicker HMRC can investigate and implement corrections.

Potential Outcomes and Refunds

Those who discover they have been incorrectly taxed can expect one of two outcomes. Individuals who have overpaid tax will be due a refund. HMRC states they will process these refunds as quickly as possible once the error is verified. Conversely, those who have underpaid tax will receive a notification requiring them to settle the outstanding balance. HMRC typically offers flexible payment options to assist taxpayers in managing any additional tax liability.

Beyond the Banks: A Wider Trend?

This incident raises questions about the accuracy of data reporting from financial institutions to HMRC. While the current issue involves savings interest and dividends, experts suggest it highlights a broader need for improved data security and validation procedures within the financial sector. "We're seeing an increasing reliance on automated data transfer between institutions and HMRC," notes David Miller, a financial technology analyst. "This creates a potential vulnerability if the data isn't properly verified at the source. This case should serve as a wake-up call for better data governance across the board."

An HMRC spokesperson reiterated their commitment to resolving the issue: "We are working with banks and building societies to fix these errors and ensure everyone pays the right amount of tax. If you think your tax code is wrong, you should contact us as soon as possible so we can investigate."