// Source citations for the factual claims in this guide (kept out of the // rendered tree: flow-level MDX comments break Next scroll-on-navigation). export const sources = [ "Sources for all rates and thresholds in this guide: - Personal allowance £12,570, basic rate 20% on £37,700 of taxable income (so 40% starts at £50,270 gross), NI annual thresholds £12,570 / £50,270 at 8% then 2%: site/lib/tax/config.ts, 2026/27 figures verified in-repo 2026-06-10 against https://www.gov.uk/guidance/rates-and-thresholds-for-employers-2026-to-2027 and https://www.gov.uk/income-tax-rates - NI per-pay-period thresholds £242/week (£1,048/month) at 8%, 2% above £967/week (£4,189/month): https://www.gov.uk/national-insurance/how-much-you-pay retrieved 2026-06-12 - NI assessed per job ("an employee earning more than £242 per week from one job"): https://www.gov.uk/national-insurance retrieved 2026-06-12 - BR code meaning ("All your income from this job or pension is taxed at the basic rate (usually used if you've got more than one job or pension)"): https://www.gov.uk/tax-codes/what-your-tax-code-means retrieved 2026-06-12 - NI deferral for people with more than one job (£967+/week in one job and £242+/week in the second): https://www.gov.uk/defer-national-insurance retrieved 2026-06-12", ];

Guide · 4 minute read

Do you pay more tax on a second job?

No. There is no second-job tax rate. The second job is taxed at a flat 20% (code BR) because your tax-free allowance already sits with job one. Over the year you pay the same income tax as one job paying the same total, and often less National Insurance.

Where the myth comes from

The myth survives because the second payslip looks brutal. Your first job deducts little or no tax (the allowance soaks it up), then the second job taxes every single pound at 20%. Side by side it feels like the second job is being punished.

It is not. HMRC gives you one personal allowance, £12,570 in 2026/27, and it can only be set against one payroll at a time. By default it goes to your main job, which gets the standard code 1257L. The second job gets code BR, which means basic rate on everything, because your tax-free amount is already being used elsewhere. Add the two payslips together and the total income tax is exactly what one job paying the combined salary would deduct.

You can check what your own codes should be doing with our tax code checker.

National Insurance: the part where two jobs can win

Income tax is assessed on your total income for the year. National Insurance is not. NI is worked out separately for each employment, pay period by pay period. In 2026/27 you pay 8% on earnings between £242 and £967 a week (£1,048 to £4,189 a month) in each job, and 2% above that, and crucially each job gets its own £242 a week of NI-free earnings.

That means two part-time jobs can leave you with a lower NI bill than one full-time job paying the same total, because you get the NI-free band twice. A second job paying under £1,048 a month attracts no employee NI at all.

Worked example: two payslips against one

Meet Sam, who earns £30,000 a year in 2026/27, lives outside Scotland, and has no student loan. Compare one job at £30,000 with two jobs at £18,000 and £12,000.

Job one, £18,000 a year (£1,500 a month), code 1257L:

• Income tax: £12,570 is tax free, so 20% on the remaining £5,430 is £1,086 a year, about £90.50 a month.
• NI: 8% on the slice of each monthly payslip above £1,048, roughly £36 a month, about £434 a year.
• Monthly take-home: about £1,373.

Job two, £12,000 a year (£1,000 a month), code BR:

• Income tax: 20% of everything, £200 a month, £2,400 a year.
• NI: £1,000 a month is below the £1,048 monthly threshold, so nothing.
• Monthly take-home: £800.

Combined: £3,486 income tax, about £434 NI, take-home around £2,173 a month.

One job at £30,000: income tax is identical at £3,486 (20% of £17,430), but NI is 8% of the full £17,430 above the threshold, about £1,394 a year. Take-home is around £2,093 a month.

Same gross pay, same income tax, and the two-job version keeps roughly £960 more per year purely because NI is assessed per employment. You can run your own numbers, including each job separately, through the take-home pay calculator.

When the default codes get it wrong

The 1257L plus BR split is only right when job one pays at least £12,570 and your combined income stays in the basic rate band. Two situations need a fix:

• Job one pays less than £12,570. Part of your allowance sits unused while job two taxes everything at 20%. Call HMRC (or use your personal tax account) and ask them to split the allowance across both jobs; you get the overpaid tax back through your code rather than waiting for a year-end refund.
• Combined income crosses £50,270. BR keeps deducting 20% on income that should be taxed at 40%, which builds up an underpayment. HMRC usually fixes this with a D0 code (everything at 40%) on the second job or an adjusted code on the first, but it is worth checking rather than waiting for a bill.

One more edge case: very high earners with £967 or more a week from one job plus £242 or more from a second can apply to defer NI on the second job, paying 2% instead of 8% on that band, so they do not overpay across employments.

The honest summary: a second job is taxed fairly, the scary-looking payslip is just the allowance sitting elsewhere, and the per-job NI treatment can quietly work in your favour. The only real risk is a stale tax code, and that is a five-minute check.

Common questions

Why is my second job taxed at BR?

BR means every pound from that job is taxed at the basic rate of 20% with no tax-free amount, because your £12,570 personal allowance is already set against your main job's code (1257L). It is the normal, correct default for a second job in the basic rate band.

Will a second job push me into a higher tax bracket?

Only if your combined income crosses the higher rate threshold (£50,270 in 2026/27 outside Scotland), and even then only the income above it is taxed at 40%. The extra job never changes the rate on what you already earn.

Do I pay National Insurance on both jobs?

Each job is assessed separately. You pay 8% on earnings above £242 a week (£1,048 a month) in each employment, so a second job paying below that threshold attracts no employee NI at all, even though you pay NI in your main job.

Can I split my personal allowance between two jobs?

Yes. If your main job pays less than £12,570, ask HMRC (by phone or through your personal tax account) to split the allowance across both employments so none of it sits unused while your second job is taxed at 20%.

Do I need to tell HMRC about a second job?

Not usually for employment. Your new employer's starter checklist tells HMRC this is not your only job, and the BR code follows automatically. You only need Self Assessment if the extra income is self-employed work rather than a payrolled job.

Guidance and education, not regulated financial advice.