Last updated: 11 February 2026
UK tax codes: at a glance
- What do I need to know? In the UK, HMRC uses tax codes to determine how much Income Tax you owe.
- What does it mean for me? If your tax code is wrong, you could pay more Income Tax than you need to.
- Why does it matter? You are responsible for making sure you have the right tax code, even though employers for PAYE staff often act on your behalf.
Tax codes determine how much you owe to HMRC. Get the wrong UK tax code on your payslip, and you could end up with less income than you should each month. If you understand how tax codes work, you can catch and correct any errors to ensure you’re paying the right amount.
In this guide, updated for the 2025/26 tax year, we break down tax codes, explain what they mean for your finances, and show you how to correct issues quickly.
Tax codes explained
Tax codes are made up of a combination of numbers and letters. Tax law is notoriously complex, but thankfully UK tax codes are relatively easy to understand once you know how they work.
For example, the tax code 1257L might look confusing at first glance. But if you place a 0 at the end, you get £12,570 – the tax-free income allowance for the year. The letter ‘L’ means you’re entitled to the tax-free Personal Allowance.
As a result, the tax code 1257L is one of the most common codes you’ll see on UK payslips.
What are the most recent changes to UK tax codes?
HMRC hasn’t changed the Personal Allowance and will keep it the same until at least 06 April 2031. Although a freeze in the tax threshold may sound positive, it can mean you pay more tax if your salary and earnings increase to account for inflation.
The Personal Allowance is £12,570.
When should I check my tax codes?
HMRC issues tax codes. But checking you’ve been assigned correctly is your responsibility in the UK. This means when your circumstances change, it’s a good idea to make sure you’re paying the correct amount of Income Tax.
There are a number of occasions when you might consider checking your tax code, such as:
Starting a new position
If you start a new job, your tax code may change. You’re usually required to give your new employer your P45 from your last position, or fill in a new starter checklist to notify HMRC of your new job. HMRC will issue a tax code to you based on this information.
Earning income outside your salary
If you receive income that isn’t paid through PAYE (such as freelance income, rental income, or interest) your taxes can become more complex. HMRC may adjust your tax code if it receives information about this income.
Receiving new employment benefits
Certain employers offer incentives beyond salary increases to attract the best talent. In some cases, the employment benefits can change how HMRC treats your tax affairs.
For example, Paul receives a promotion at work which makes him eligible for a company car. Even though Paul doesn't own the car, its taxable value may be included in his tax code because HMRC treats some benefits as taxable income.
This means Paul’s tax code could change even if his salary increase didn’t reduce his Personal Allowance.
Recent retirement
For most UK taxpayers, the PAYE system means that their employer handles their Income Tax payments before they receive their salary. But when you stop working, the way you fund your retirement and pay taxes is often left to you, unless you hire someone else like a financial adviser or your pension provider takes care of your income for you.
In general, HMRC treats your pension as taxable income when you withdraw it, unless you intend to make use of the pension tax-free lump sum. So, it might be sensible to check your tax codes are right when you start taking money from your pension to ensure you’re not paying the incorrect amount of Income Tax.
Owning more than one pension
Over the course of a modern career, it’s normal to work for a handful of different companies. Since 2015, the UK government has mandated that employers automatically enrol their staff into pension schemes if they earned £10,000 a year or more. This means that it’s highly likely that several different pension pots will exist in your name.
Drawing income from multiple sources can automatically make your taxes more complex. For example, it can lead you to have multiple tax codes at once. Checking that you’re paying the right amount is essential for your peace of mind, especially as you enter your golden years.
How can I check my tax code is correct?
If you’re employed as a PAYE employee, your payslip should reference your tax code. The exact location will vary depending on the design of your payslip. But it should be clearly visible. You can also check your tax code on the HMRC website or by downloading the app.
What do tax codes cover?
Certain work benefits, like company cars, can affect how your income is calculated, and may reduce your tax-free Personal Allowance.
Other benefits, such as bonuses, can also influence your tax code and the amount you pay.
If you’re unsure about how your benefits impact your tax code, it’s a good idea to speak with your HR department.
HMRC considers pensions as income, so tax codes apply when you withdraw money for your retirement savings.
How do you pay tax if you’re employed?
If you’re employed under PAYE like most of the UK workforce, your employer will automatically deduct tax from your wages. Tax codes show your allowances and exemptions, so understanding them can help clarify your tax situation.
For example, if you earn a salary of over £125,140 per year, your tax code is either 0T, S0T, or C0T. This means you’re not entitled to any tax-free Personal Allowance.
High earners often use salary sacrifice schemes to increase their pension savings and reduce taxable income.
What are all the tax codes in the UK?
We’ve listed the various tax codes below and assigned general categories to help explain when they usually apply.
These categories serve as a guide and may not cover the specifics of your financial situation. If you’re unsure whether your tax code is correct, consider speaking to a Financial Adviser for personalised guidance.
| Tax code | Meaning | Category |
| L | Entitles you to the standard tax-free Personal Allowance. | Personal Allowance |
| 0T | You don’t qualify for the Personal Allowance. This is typically because you earn over £125,140 per year, or your employer doesn’t have enough information to assign you another code. | Personal Allowance |
| T | Your tax affairs need to be reviewed by HMRC because they’re complicated. Your Personal Allowance is determined by the numbers that come before the letter (provided it doesn’t follow a 0). | Personal Allowance |
| BR | Applied to payslips where you’re not eligible for the Personal Allowance. This is because this income is considered a second job. With this tax code, you’ll pay the basic rate of tax (20%) on the whole sum. It can also apply to some pensions. | Second jobs/pensions |
| D0 | Similar to the tax code above, all income is taxed at the higher rate of 40% (known as the intermediate rate if you live in Scotland, which is 21%). It usually applies to second jobs and some pensions. | Second jobs/pensions |
| D1 | A variation on the D0, SD0 and CD0 codes, this income is taxed at the additional rate of tax at 45% (41% for Scottish residents). The code usually applies to second jobs or pensions. | Second jobs/pensions |
| K | If your tax code has a ‘K’ at the beginning, it means you owe tax from a previous year and need to make up the difference. | Negative balance |
| M or N | You can transfer up to 10% of your Personal Allowance to a spouse or civil partner. The person that receives this is marked with an ‘M’, whereas the person that donated their allowance to their partner is noted with an ‘N’. | Marriage and civil partnerships |
| NT | No tax is due on this income. | Full exemption |
| W1, M1, or X | A set of (usually) temporary tax codes that apply when you’ve started a new job, or your circumstances have changed significantly. HMRC will use emergency tax codes until they can work out how much you owe. | Emergency tax |
| S or C | You’re based in either Scotland (S) or Wales (C). If neither letter is at the start of your tax code, you’re based in England or Northern Ireland. | Location |
Tax codes at a glance: key points
There are two key points to note based on the tax codes listed above:
1. Second jobs
If you have more than one job, HMRC needs to know your main source of income – typically the one that pays more. Your second job will generally be taxed on the full amount earned, though the rate will vary depending on your circumstances.
2. Pensions
You can withdraw your pension either in stages or as a lump sum. Since pensions are treated as taxable income in retirement, withdrawing funds in a tax-efficient way is important. For example, you may be able to take a 25% tax-free lump sum, but further withdrawals will be taxed based on your Income Tax bracket.
How do I know if I'm on the right tax code?
If you’re working as a PAYE employee your payslip, P60, or P45 documents are the quickest ways to check your tax codes. If you have a private pension, you’ll get a P60 statement every year.
You can also look up your pension advice slip to check your tax code if you’re retired.
What to do if your tax code is wrong
If you believe your tax code is incorrect, contact HMRC. Tax codes are ultimately the taxpayer’s responsibility, even if they’re assigned incorrectly by an employer. Acting quickly will help ensure you’re paying the correct amount of tax.
HMRC offers some online services where you can update your circumstances. For confidential support, you’ll need to call or write to them.
You can call HMRC on 0300 200 3300, Monday to Friday, from 8am to 6pm (closed on bank holidays and weekends).
Emergency tax codes explained
When your circumstances change, such as starting a new job, HMRC might take some time to update your tax code. During this time, an emergency tax code will be applied temporarily to make sure enough tax is taken from your pay until they confirm the correct code.
Ask HMRC for a rebate if you've overpaid. If you don’t claim your refund online within 21 days, HMRC sends you a cheque in the post. To avoid delays, make sure HMRC has your current address. There are times when HMRC may automatically refund you, but it’s usually a good idea to check if you’re unsure.
Frequently asked questions about UK tax codes
What is the most common UK tax code in 2026?
The most common tax code in the UK is 1257L. This means you’re entitled to the standard Personal Allowance of £12,570. The income you earn before that amount is exempt from Income Tax.
Why do tax codes change mid-year?
You can change tax codes for a range of reasons, from starting a new job to retiring from the workforce. If your income changes, it’s usually sensible to check your tax codes are correct as they’re your responsibility, even if you’re employed full time.
Decoding UK tax codes
Getting your tax code right is essential if you want to safeguard your finances. Although tax law can be confusing, understanding the combination of letters and numbers that make up tax codes means you can quickly respond to costly errors.
By checking whether you have the right UK tax code, you can focus on your long-term financial goals, like earning more from your savings.
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