- You get one Personal Allowance of £12,570 across all your jobs, so a second job is usually taxed from the first pound at 20% under a BR code.
- Self-employed side income is taxed separately through Self Assessment, but the £1,000 trading allowance can keep small earnings tax-free.
- Having two incomes doesn’t mean paying extra tax overall, it just changes how and when the tax is collected.
Tax on a second job usually works out at 20% from the first pound, because your £12,570 Personal Allowance is already used up by your main job.
There’s no special “second job tax” and no higher rate just for having two roles. HMRC simply adds your incomes together and taxes the total.
If your second job is self-employed, it’s taxed separately through Self Assessment, and the first £1,000 might be tax-free. The figures below are for the 2026/27 tax year.
How is a second job taxed?
A second employed job is taxed at 20% from the very first pound in most cases, because your Personal Allowance is already attached to your main job.
You only get one Personal Allowance of £12,570 per tax year, no matter how many jobs you have. It’s normally set against whichever job pays you the most.
Your main job keeps the standard 1257L code. Your second job gets a different one.
What the BR, D0 and D1 tax codes mean
Your second job’s tax code tells the employer which rate to apply, since there’s no allowance left to give you. Here’s what each one means for 2026/27:
Tax code | Rate applied | When you’ll see it |
BR | 20% on all earnings | Total income stays within the basic rate band |
D0 | 40% on all earnings | Combined income pushes you into the higher rate band |
D1 | 45% on all earnings | Combined income reaches the additional rate band |
If you spot 1257L on both jobs, tell HMRC quickly. That means you’re getting the allowance twice, and a bill will follow once HMRC catches up.
For a fuller breakdown of what each code actually signals, our guide to tax codes explained walks through the detail.
Do I pay National Insurance on both jobs?
National Insurance is worked out separately for each job, not on your combined income.
For 2026/27, you pay Class 1 NI at 8% on earnings between £12,570 and £50,270 in each employment, then 2% above that. If each job pays below the threshold on its own, you might pay no NI at all, even when the two together sit above it.
This is one area where two jobs can actually work in your favour compared to earning the same total from one employer.
How is self-employed side income taxed?
Self-employed side income is taxed through Self Assessment, completely separately from the PAYE tax on your employed wage.
Your employer keeps deducting tax and NI from your salary as normal. Your side earnings get declared once a year, and you pay any tax due directly to HMRC.
That means no tax code juggling for the side income itself, but you are responsible for reporting it.
The £1,000 trading allowance
The trading allowance lets you earn up to £1,000 of gross self-employed income in a tax year without paying tax on it or even telling HMRC.
Go over £1,000 and you’ll need to register for Self Assessment and report the income. At that point you get a choice: deduct the flat £1,000 allowance, or claim your actual business expenses instead. You can’t do both.
If your side hustle has real costs, like stock, software or travel, add them up before deciding. If they beat £1,000, claim the expenses instead of the allowance.
If you’re weighing this up, being employed and self-employed covers how the two statuses sit together, and sole trader tax explains what you’ll actually owe once you’re over the threshold.
What Making Tax Digital means for side income
Making Tax Digital for Income Tax is now in effect. From April 2026, if your combined gross income from self-employment and property is over £50,000, you must keep digital records and send HMRC quarterly updates using compatible software.
That threshold drops to £30,000 from April 2027, so more side hustlers will be pulled in soon.
Your PAYE salary doesn’t count towards the threshold. It’s only your self-employed and property income that decides whether you’re in scope.
Will I pay more tax with two incomes?
Having two incomes doesn’t increase your total tax bill compared with earning the same amount from a single job. The system just splits the collection across two payslips.
HMRC adds everything together to decide your total taxable income and which bands apply. The tax codes are the mechanism for collecting the right amount as you go.
Where people get caught out is timing and coding, not the underlying rules.
When a second job tips you into the higher rate
The catch comes when your combined income crosses £50,270 and your codes haven’t kept up.
Say your main job pays £45,000 and your second pays £10,000. A BR code taxes all £10,000 at 20%, but part of it should sit at 40% once you’re over £50,270. HMRC usually corrects this mid-year or at year-end, but you could face an unexpected bill if it doesn’t.
If your codes look wrong, check them in your Personal Tax Account and contact HMRC. You can find HMRC’s own worked examples in the official guidance on having more than one job.
For a wider view of the bands themselves, UK tax brackets for freelancers sets out where each rate kicks in.
When should I register as self-employed or form a company?
You must register as self-employed once your gross side income passes the £1,000 trading allowance in a tax year. The deadline is 5 October following the end of that tax year.
Registering isn’t just an obligation, though. It’s often the point where formalising starts to make financial sense.
Here’s a simple way to think about the options as your side income grows:
- Under £1,000 gross: the trading allowance covers you. No registration, no return.
- Over £1,000 as a sole trader: register for Self Assessment and report your profits each year.
- Growing steadily or earning well: a limited company can be more tax-efficient, though it brings more admin and filing duties.
The right structure depends on how much you’re making, how stable it is, and how much admin you’re willing to take on. Our self assessment service can handle the reporting side while you weigh up whether to incorporate.
How Sleek helps with tax on a second job
Juggling a salary and side income means two sets of rules, two deadlines and two ways of getting taxed. It’s easy to lose track of what you owe and when.
Sleek takes the guesswork out of it. From checking your tax codes to filing your Self Assessment and advising on whether to formalise as a sole trader or company, we keep your second income compliant and tax-efficient.
If your side hustle is growing, a sole trader accountant can make sure you’re structured the right way from the start.
Disclaimer: The preceding information is not legal advice. This content is aimed to provide general guidance. For more formal or legal advice, contact Sleek directly.
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FAQs on tax on a second job
Does my second job get taxed at a higher rate than my first?
No. There’s no special higher rate for second jobs. It only looks that way because your Personal Allowance is used by your main job, so your second job is taxed from the first pound. A BR code applies 20%, but your total tax across both jobs is the same as earning the combined amount from one employer.
Can I split my Personal Allowance between two jobs?
Yes. If both jobs pay less than £12,570, you can ask HMRC to split your £12,570 allowance across them so you don’t overpay. This works best when both incomes are steady. Contact HMRC to arrange it, otherwise your second job will default to a BR code and tax all its earnings at 20%.
Do I need to file a Self Assessment just for a second employed job?
No. If both jobs are PAYE employment, HMRC reconciles your tax automatically through the tax code system. You’d only need Self Assessment if you also have self-employed income, your total income exceeds £150,000, or another triggering reason applies, such as untaxed income HMRC can’t collect through your code.
How much can I earn from a side hustle before paying tax?
You can earn up to £1,000 of gross self-employed income in a tax year tax-free under the trading allowance. Below that, you usually don’t need to register or report it. Above £1,000, you must register for Self Assessment by 5 October after the tax year ends and declare the income, choosing either the allowance or your actual expenses.
Will I overpay National Insurance with two jobs?
You might. NI is calculated per job at 8% between £12,570 and £50,270, so if both jobs pay above the threshold you could pay more than someone earning the same total from one job. The good news is you can claim a refund from HMRC for overpaid NI after the tax year ends.
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What happens if HMRC gives me the wrong tax code?
You’ll either overpay or underpay during the year. If 1257L wrongly appears on both jobs, you’ll underpay and owe HMRC later. If a BR code applies but your total income is below £12,570, you’ll overpay. Check your codes in your Personal Tax Account and contact HMRC to correct them, or claim any refund at year-end.
Is a limited company more tax-efficient for side income?
It can be, but not always. A company can offer tax advantages once profits are steady and reasonably high, mainly through how you draw money as salary and dividends. It also brings more admin, filing duties and costs. For smaller or irregular side income, staying a sole trader is usually simpler and cheaper.
