Working Two Jobs in the UK? Will You Have to Pay More Tax?

Taking on a second job can be a good way to increase your income, but it may also raise questions about tax. In the UK, Income Tax is calculated based on your total taxable income for the tax year, rather than treating each job as a completely separate source of income. This means that having more than one job does not automatically mean you will pay more tax.

It is important to remember that the standard Personal Allowance is £12,570 for the 2026/27 tax year. You receive this allowance once per person, not separately for each job. HMRC usually applies it to your main employment, while your second job may have a different tax code. For example, the BR tax code means that all income from that employment is taxed at the basic rate of 20%.

This is why you may notice a change in your take-home pay after starting a second job. If HMRC assigns an incorrect tax code or does not have up-to-date information about your income, you may temporarily pay too much or too little tax. You can check your employers, estimated income and tax codes through your Personal Tax Account or the HMRC app.

If you work for two or more employers, it is important to make sure your Personal Allowance is allocated correctly and all your income is taken into account. After the end of the tax year, HMRC may review the amount of tax you have paid and issue a P800 tax calculation if you have overpaid or underpaid. Capital Accountants can help you understand your tax codes, review your calculations and avoid unexpected tax bills.