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How Is Back Pay Taxed? A Guide For Employees In The Uk

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By Author: Thomas Edward
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Is Back Pay Taxable?

Yes, back pay is subject to income tax and National Insurance (NI) contributions, just like regular wages. The taxation of back pay depends on the period it covers and when it is paid.

How is Back Pay Taxed?

Back pay is usually taxed in the payroll period in which it is paid, rather than being spread across the original pay periods it relates to. This can sometimes lead to higher tax deductions due to temporary movement into a higher tax bracket.

1. Income Tax on Back Pay

Back pay is taxed under the Pay As You Earn (PAYE) system. This means:

The amount is added to your total taxable income in the period you receive it.

Your employer will deduct tax at your usual rate (20%, 40%, or 45%).

If the back pay pushes you into a higher tax bracket for that month, you might pay more tax than expected.

2. National Insurance (NI) Contributions

National Insurance is also deducted from back pay, but unlike income tax, NI is calculated based on the period in which the back pay is received, not when it was earned. This means:

If the lump sum increases ...
... your earnings for the period above NI thresholds, you may pay a higher NI contribution.

NI rates for employees in the 2024/25 tax year are 10% (standard rate) or 2% (above the upper earnings limit).

Impact of Back Pay on Tax Codes

If you receive a large back pay sum, it may temporarily affect your tax code. HMRC may adjust your code to reflect the extra income, ensuring you do not overpay or underpay tax in the long run.

Reclaiming Overpaid Tax on Back Pay

If you have paid too much tax due to back pay, you can:

Wait for HMRC to adjust your tax code automatically.

Request a tax refund by contacting HMRC or using the online tax refund service.

Check your P800 tax calculation at the end of the tax year.

What if Back Pay Covers Multiple Tax Years?

If back pay relates to previous tax years, your employer may spread the tax liability across those years. However, they usually deduct tax based on the current year's tax rules unless an alternative arrangement is made with HMRC.

Final Thoughts

While back pay can be a helpful financial boost, it is essential to understand how it affects your tax and National Insurance. If you are unsure about deductions, speak to your employer's payroll department or consult HMRC. For expert payroll and tax advice, visit Payroll Services Accountants for professional support.

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