Second Job Tax Calculator 2026/27: Work Out Your Take-Home

You’ve picked up weekend shifts, a few evenings in a bar or a part-time contract alongside your day job, and your first payslip from it shows a fifth of your pay gone in tax. It’s easy to assume you’re being penalised for working harder. Usually you aren’t. The tax system is simply collecting at a flat rate on the second job because your tax-free allowance has already been used by the first.

The 2nd job tax calculator above shows what is really happening. Below, we explain how to read the results, what each tax code does, how National Insurance works with two employers, and what to do if your codes are taking too much.

How to Use the Second Job Tax Calculator

1. Enter your yearly pay for each job before any deductions. If you’re paid hourly, multiply your hourly rate by your expected hours for the year.
2. Choose where you live. Scotland has its own Income Tax bands, so results differ from the rest of the UK.
3. Pick the tax code on your second job’s payslip. It’s usually printed near your name or pay date. Choose “Split allowance” if HMRC has moved part of your allowance to that job.
4. Add your student loan plan if you have one, then press Calculate.

The results table shows the Income Tax, National Insurance and student loan taken by each employer, and your take-home pay. The blue box underneath compares what your codes collect with the tax you should pay on your combined income. If there’s a gap, you’ll see whether you’re likely to get a refund or owe money.

The calculator is built for two employed jobs paid through PAYE. It doesn’t cover self-employed side income, benefits, pension contributions or the Marriage Allowance. If any of those apply, treat the figures as a starting point.

Do You Get Taxed More on a Second Job?

No, not overall. Income Tax is charged on your total income for the tax year, using one Personal Allowance and one set of bands. Earning £38,000 from two jobs costs you the same Income Tax as earning £38,000 from one. You can check this in the calculator: with £30,000 and £8,000 the total is £5,086 either way.

What feels like “more tax” comes from how it’s collected. Your main employer gives you the full £12,570 allowance, so the first slice of that pay is tax-free. Your second employer can’t give you another allowance, so GOV.UK explains that a code such as BR taxes all the income from that job at the basic rate. Every pound on the second payslip is taxed from the start, which looks harsh but is usually correct.

The real risk is the code being wrong for your situation. If your combined pay pushes you into the higher rate, BR collects too little. If your main job pays under £12,570, BR collects too much. The next sections explain how to tell which applies to you.

Second Job Tax Codes: BR, D0, D1 and 0T

The code on your second payslip decides how much is taken each payday. Most second-job codes skip the usual allowance and bands and apply a single rate to everything you earn there. HMRC’s PAYE manual describes each one:

One point causes a lot of confusion. A flat-rate code taxes all of the second job’s pay at one rate, even when only part of it really falls in that band. So if your combined income crosses £50,270 partway through the second job, neither BR nor D0 is exactly right: BR will collect too little and D0 too much. HMRC usually balances this out later through your tax code or a calculation after the year ends, but it’s worth knowing which way you’re likely to be out.

2nd Job Tax Calculator Examples for 2026/27

These three examples show how much tax on a second job you can expect in common situations. Each was run through the tax calculator for a 2nd job above and checked by hand. They assume England, Wales or Northern Ireland, no student loan and a standard 1257L code on the main job.

So, how much do you get taxed on a second job? The second job tax rate on your payslip is usually 20%, but your fair share depends on your combined income. Type your own figures into the second job tax calculator to see which of these three patterns matches you.

National Insurance When You Have Two Jobs

National Insurance doesn’t follow the same rules as Income Tax on second job pay. Instead of one allowance across all your pay, each job is looked at on its own. As the Low Incomes Tax Reform Group puts it, “for National Insurance there is a separate limit for each job.” For 2026/27, employees pay 8% on earnings between £242 and £967 a week and 2% above that, in each job separately.

That can work in your favour. In the calculator’s default example, a £9,000 second job works out at about £173 a week, below the £242 threshold, so no National Insurance is taken from it. The same £39,000 earned in a single job would cost about £720 more in National Insurance for the year. The exception is jobs with connected employers, which may be treated as one.

Because National Insurance is worked out each pay period, irregular pay can change the result. A month with extra overtime may tip the second job over the threshold even if the yearly total suggests otherwise.

Student loans work the same way

GOV.UK confirms that student loan repayments are only taken from jobs where your pay is over the threshold for your plan, not on your combined income. If your second job pays below the threshold, nothing is deducted there.

Splitting Your Personal Allowance

GOV.UK says you only get one Personal Allowance each tax year, and it’s usually given to the job that pays you most. That’s fine when your main job pays more than £12,570. But if neither job uses the full allowance on its own, as in Leah’s example above, some of it goes to waste each payday.

The fix is to ask HMRC to split your allowance, so part of it goes on each job’s code. GOV.UK’s advice is to contact HMRC to check whether your allowance can be split. LITRG adds a sensible warning: only do it if the pay from each job is predictable and stable, and review it whenever your hours change.

1. Check your current codes in your personal tax account or the HMRC app.
2. Work out roughly how much each job will pay this tax year.
3. Contact HMRC’s Income Tax helpline and ask for your allowance to be divided between the jobs.
4. Check your next payslips to confirm both employers are using the new codes.

Paying Too Much Tax on a Second Job? How to Fix It

If the second job tax calculator shows your codes collecting too much, you have two options. You can contact HMRC during the year to have your codes corrected, which stops the overpayment straight away. Or you can wait: GOV.UK explains that after the tax year ends, HMRC checks your total tax and usually sends a P800 tax calculation showing whether you’re due a refund or owe tax.

Watch out for the opposite problem too. LITRG notes that if HMRC doesn’t know about all your jobs, you might be given the allowance more than once, which leaves you underpaying. Always tell HMRC when you start a second job, and keep your payslips and P60s from both employers so you can check the figures. If you’ve lost one, here’s how to get your P60.

If you already file a Self Assessment return for other income, both jobs go on it, and any difference is settled there. Our guide to filing your first Self Assessment return explains the process.

Second Job vs Self-Employed Side Income

Everything above applies to a second job where an employer pays you through PAYE. If your extra income comes from freelancing, deliveries, selling online or similar work for yourself, the rules change. No employer deducts tax, so it’s your job to report it. GOV.UK says you may need to pay tax on self-employed income through Self Assessment if it’s more than £1,000.

If your side income is self-employed, our guide on reducing your tax bill as a self-employed person is the better starting point. For help with your first return, see our first tax return service.

FAQs

Is a second job always taxed at 20%?

Not always. Code BR takes 20%, but D0 takes 40% and D1 takes 45%, and Scotland uses its own codes. What you actually owe depends on your combined income for the year.

Do you get taxed more on a second job?

No. Your total Income Tax is the same as if you earned the combined amount from one job. The second job just gets no tax-free allowance, because your main job is already using it.

Is there a free tax calculator for a 2nd job?

Yes. The calculator at the top of this page is free, uses 2026/27 rates and shows tax, National Insurance and student loan for each job, plus whether your codes collect too much or too little.

Can I split my Personal Allowance between two jobs?

Possibly. Contact HMRC to check whether your allowance can be split. It works best when the pay from each job is steady and predictable.

Do I pay National Insurance on both jobs?

National Insurance is worked out separately for each job. If a job pays less than £242 a week in 2026/27, no employee National Insurance is due on it.

Does a second job affect my student loan?

Repayments are worked out per job, not on your combined pay. Nothing is deducted from a job that pays below your plan’s threshold.

Does the calculator work for Scotland?

Yes. Choose Scotland and it applies the 2026/27 Scottish bands and Scottish codes such as SBR and SD0. National Insurance and student loan rules are the same across the UK.

Final Verdict: Second Job Tax Calculator

A second job isn’t taxed more harshly than a first. It’s taxed differently, with a flat-rate code instead of an allowance. Most of the time that works out right, but it can go wrong if your main job pays under £12,570 or your combined pay crosses into the higher rate. Use the second job tax calculator to compare what your codes collect with what you really owe, then contact HMRC early if the numbers don’t match.