Two Jobs Tax Calculator
Working two jobs is increasingly common in the UK — whether you are supplementing your main income, building a side business, or transitioning between careers. Our two jobs tax calculator shows exactly how income from a second job is taxed, why the rate is often higher than your first job, and what your combined take-home pay will be across both roles in 2026/27.
Two Jobs Tax Calculator
See how having two jobs affects your tax. Your second job won't have the personal allowance, so you'll pay more — find out exactly how much.
How Tax Works on a Second Job
The key principle is that everyone has a single Personal Allowance of £12,570 — not one per job. Your main employer applies the full Personal Allowance through your tax code (usually 1257L), meaning income up to £12,570 is tax-free. Your second employer receives a BR or D0 tax code from HMRC, meaning the second job income is taxed from the first pound with no allowance applied.
If your main job pays £25,000 and your second job pays £8,000, the second job income is taxed entirely at 20% — even though your combined income is only £33,000 and you have not used your full basic rate band. This can feel unfair, but it is simply because your allowance has already been allocated to your first job. Any over or underpayment is reconciled at year-end through a P800 notice or self-assessment.
National Insurance on Two Jobs
Unlike income tax, National Insurance does not aggregate earnings across employers. Each employer calculates NI independently on the earnings from that job. If your second job earns less than the Primary Threshold of £12,570, you pay no NI on those earnings at all — even if your combined income is well above the threshold. This is a genuine NI saving that applies automatically, with no action required on your part.
Self-Assessment Requirement
If you have two PAYE jobs, HMRC usually handles the tax through your tax codes without requiring self-assessment. However, if your combined income exceeds £100,000, you must complete a self-assessment return. You should also register if your second job is self-employed (freelance, contractor, sole trader) — any net profit above £1,000 per year requires a self-assessment return. Our Income Tax Calculator can model your total tax liability across both income sources.
Frequently Asked Questions
Not necessarily. If your main job income is below £50,270, your second job income is taxed at 20% (basic rate) on the BR code. The 40% rate only applies if your combined income from both jobs exceeds £50,270. In that case, HMRC may adjust your codes to collect the right amount across the year.
Yes — you can ask HMRC to split the Personal Allowance between employers if you expect both jobs to provide ongoing income. This avoids over-withholding on the second job but requires HMRC to issue a T code or adjusted codes to both employers. Contact HMRC to arrange this.
Yes. When you start a second job, you should inform your new employer and HMRC. Your new employer will apply a BR code until HMRC issues the correct code. Failing to inform HMRC can lead to incorrect deductions that take time to unwind.
Auto-enrolment applies to each qualifying job separately. If your second job earnings are above £10,000 per year, your employer must auto-enrol you and contribute at least 3%. You can opt out, but this means forgoing employer contributions. Consider whether the employer contribution from a second job makes it worth staying enrolled.
Self-employment income above £1,000 per year must be declared via self-assessment. You pay income tax on profits at the same marginal rates as employment income, and Class 4 NI at 6% on profits between £12,570 and £50,270. Class 2 NI of £3.65 per week builds State Pension entitlement. See our National Insurance Calculator for self-employed NI estimates.
Enter Job 1 and Job 2 annual salaries separately. Job 1 receives the full personal allowance; Job 2 uses either a BR code (20% on all income) or D0 (40%) because the allowance is already used. The calculator uses the marginal approach: it calculates tax on Job 1 alone, then on both combined, and the difference is attributed to Job 2. National Insurance is calculated per employment independently — if Job 2 pays less than the Primary Threshold (£12,570), you pay no NI on it. Results show Total Tax and NI across both jobs, the specific tax on Job 2, and combined take-home. Use this to decide whether a second income is financially worthwhile, or whether a different arrangement — such as a sole trade — might be more tax-efficient.
Important Information
This calculator is provided for general information and planning purposes only. It does not constitute financial or tax advice and should not be relied upon as such. Figures are indicative estimates based on simplified, publicly available criteria and stated assumptions. Actual results depend on your full circumstances. See our Disclaimer for further information.