Two Jobs Tax Explained: How PAYE Works With Multiple Employers in the UK

How Income Tax Works With Two Jobs

The most important thing to understand is that your total income tax bill is based on your combined earnings from all jobs. Having two jobs does not mean you pay more income tax overall.

Your personal allowance of £12,570 applies once across all your employment. It is not doubled or split automatically. In most cases, HMRC assigns your full personal allowance to your primary job (the one earning the most) and your second job is taxed from the first pound.

During the year, PAYE deductions on each payslip are estimates. Your primary employer uses tax code 1257L (which includes your personal allowance), while your second employer typically uses a BR code (basic rate, 20% on everything). This means you may temporarily overpay or underpay tax month to month, but HMRC corrects the total after the tax year ends.

See the current income tax rates on GOV.UK.

Understanding Tax Codes for Two Jobs

Your tax code tells your employer how much tax-free pay to give you. When you have two jobs, HMRC assigns different codes to each one. Here are the most common scenarios:

You can check and update your tax codes through the GOV.UK tax codes guide.

Why National Insurance Is Different

Unlike income tax, National Insurance is calculated separately for each job. Each employer treats your earnings independently. This means the NI threshold (£12,570 in 2025/26) applies separately to each employment.

This can actually work in your favour if your earnings are split in certain ways, because each job gets its own NI-free threshold. Here is a comparison:

In this example, two £30k jobs actually result in lower NI because each job gets its own £12,570 threshold before NI kicks in. With one £60k job, you only get the threshold once and also pay the 2% upper rate on earnings above £50,270.

See the current NI rates on GOV.UK.

Worked Example: Two Jobs vs One Job

Let's compare someone earning £50,000 from one job versus £30,000 + £20,000 from two jobs in the 2025/26 tax year:

In this case, having two jobs actually saves £206 per year because of the NI threshold reset. The income tax is identical — only the NI calculation differs. Use our Two Jobs Calculator to run your own numbers.

How to Check Your Tax Codes Are Correct

Incorrect tax codes are the main reason people with two jobs overpay tax during the year. Here is how to check:

1. Log into your Personal Tax Account at GOV.UK
2. Check each employment — make sure both jobs appear and the tax codes match what is on your payslips
3. Verify your personal allowance — confirm it is allocated to the right job (usually your highest-paying one)
4. Contact HMRC if codes look wrong — you can update them online or call 0300 200 3300

Getting your tax codes right means you pay the correct amount each month and avoid waiting for a refund after the tax year ends.

What Is a P800?

A P800 is HMRC's end-of-year tax calculation. After the tax year ends on 5 April, HMRC checks whether you paid the right amount of tax across all your employments. If you overpaid, they send you a P800 and you receive a refund. If you underpaid, they adjust your tax code for the following year to collect the difference.

P800s are very common for people with two jobs because PAYE deductions during the year are based on estimates. You can usually claim your refund online and receive it within 5 working days.

Learn more about tax overpayments and underpayments on GOV.UK.