Yes. In the UK, you can usually have more than one job at the same time. The main exceptions are if your contract limits outside work, your hours create a working time issue, or there is a conflict of interest with your employer.
Can you legally have two jobs at the same time in the UK?
Yes, in most cases you can. There is no general law saying you may only have one employer. Many people combine a full-time role with part-time work, evening shifts, weekend work or seasonal work.
What matters is whether anything specific restricts you. That could be a clause in your employment contract, rules in a regulated role, or practical limits around hours and rest. If you are employed, the first place to check is your contract and staff handbook.
Your contract may require permission before taking other paid work.
Your employer may restrict outside work that competes with their business.
Some roles have rules around confidentiality, conflicts of interest or exclusivity.
Your total working time still needs to be manageable in practice.
Can my employer stop me having a second job?
Sometimes, yes. Your employer cannot create a blanket rule without any basis, but they may be able to restrict second jobs through your contract. This is usually about conflict of interest, performance, fatigue, confidentiality or availability.
For example, a second job might be an issue if it is for a direct competitor, affects your attendance, or means you are too tired to do your main job safely. If your contract says you must ask for consent before taking other work, that clause matters.
If there is no restriction in your contract, that does not automatically mean every second job is risk-free. Problems can still arise if your outside work affects your performance or breaches duties you already owe to your employer.
How does tax work if you have more than one job?
You still get one Personal Allowance across your income overall, not one per job. For 2026/27, the standard Personal Allowance is £12,570. Usually, HMRC gives that allowance to your main job and taxes your other job separately.
In practice, your main job often uses the standard tax code if your tax affairs are straightforward. Your second job may use a code that taxes all or most of that pay without a separate allowance. That is why a second job can look heavily taxed on the payslip even when the total tax across the year is broadly right.
Income Tax is based on your total taxable income across all jobs. For 2026/27, the basic rate applies to taxable income up to £37,700 above your allowance, the higher rate then applies up to £125,140, and the additional rate applies above that.
Personal Allowance: £12,570
Basic rate: 20%
Higher rate: 40%
Additional rate: 45%
Personal Allowance starts tapering once income is over £100,000
This means your second job does not have a special tax rate just because it is a second job. It is simply added to your other taxable income. The rate you pay depends on your total income for the tax year.
Why is my second job taxed so much?
Usually because your Personal Allowance is already being used elsewhere, or because HMRC has given the second job a temporary or emergency tax code. A second payslip can therefore show more tax than you expected.
That does not always mean you are overpaying for the year overall. PAYE works job by job during the year, based on the information HMRC and your employer have at that point. If the code is wrong, you may pay too much or too little until it is corrected.
If you have recently started another job, changed hours or left one employer, tax codes can take time to catch up. This is one reason people with more than one job sometimes end up due a refund or owing extra tax later.
Do you pay National Insurance on both jobs?
Yes, potentially. National Insurance is usually worked out separately for each employment, rather than on your combined pay across all jobs. That is different from Income Tax and often catches people out.
For employees in 2026/27, the main Class 1 employee National Insurance rate is 8% on earnings between £12,570 and £50,270, and 2% on earnings above £50,270. Because each job is assessed separately for NI, you might pay less or more NI than you expected compared with earning the same total amount from one job.
A simple example helps. If you split your work between two lower-paid jobs, one or both jobs may sit below the NI threshold, so NI may be lower than if the same total pay came from one employer. But the exact result depends on the pay level and pay frequency in each job.
How do student loan repayments work if you have two jobs?
Student loan deductions can happen separately in each job through PAYE. That means each employer looks at your pay with them, not your combined income across all jobs, when deciding whether to deduct.
For 2026/27, annual thresholds are £26,900 for Plan 1, £29,385 for Plan 2, £33,795 for Plan 4, £25,000 for Plan 5 and £21,000 for Postgraduate loans. The repayment rate is 9% above the threshold for Plans 1, 2, 4 and 5, and 6% above the threshold for Postgraduate loans.
Because deductions are job by job, two part-time jobs can produce a different result from one job with the same total annual pay. You could have no deductions in either job if each sits below the relevant threshold, even if your combined income is higher. The opposite can also happen in some situations during the year, depending on payroll timing and job changes.
What happens to my pension if I have more than one job?
You may be assessed for workplace pension enrolment separately by each employer. One job might enrol you while another does not, depending on your age and earnings in that employment.
If you are enrolled in more than one workplace pension, contributions can be taken from more than one payslip. That changes your take-home pay. The tax effect also depends on whether the pension uses relief at source, net pay or salary sacrifice.
This is another reason two jobs with the same total salary as one larger job may not produce exactly the same monthly take-home pay.
Do working time rules stop you having two jobs?
Not necessarily, but they can matter. Working time rules are about your total hours and rest, not just each job in isolation. If your combined schedule is too heavy, that can create a compliance or safety issue.
This matters more in jobs involving driving, healthcare, machinery, night work or anything safety-critical. Even where the rules allow the hours, employers may still be concerned about fatigue and performance.
What should you check before taking a second job?
Check the practical and payroll points first. Most problems with second jobs are about contracts, tax codes and deductions rather than whether the job itself is allowed.
Your employment contract and any permission requirement
Whether the work creates a conflict of interest
How many hours you would work in total
Which job should use your Personal Allowance
Whether the new job has the right starter information
Any student loan deductions
Whether you will be auto-enrolled into a pension
Will having two jobs always increase your take-home pay?
Yes, earning more usually means taking home more, but not in a simple one-for-one way. Extra income can be taxed at 20%, 40% or 45% depending on your total taxable income, and it can also increase NI, pension contributions and student loan deductions.
That is why the best way to judge a second job is to look at net pay, not just the extra gross salary or hourly rate. Two offers with similar headline pay can produce different monthly take-home amounts once deductions are applied.
What is the bottom line if you have more than one job?
You can usually have more than one job at once in the UK. The key point is that tax, NI, pension and student loan deductions may be calculated differently across separate employments, so your payslips can look unusual even when the year-end position is broadly correct.
If you want to understand the real impact, compare your combined take-home pay rather than relying on gross figures. That is especially useful if one job is part-time, your tax code has changed, or you are close to a tax or student loan threshold.