Tax codes. They’re frustrating. They’re confusing. And to most people, they can seem like a downright bore.
What does my tax code mean? Am I paying the right amount of tax? Why has HMRC changed my tax code? Could I be paying too much or too little?
Your tax code tells your employer or pension provider how much Income Tax should be deducted from your earnings. While tax codes can look like a random combination of numbers and letters, each part provides information about your tax-free allowance and your personal circumstances.
That’s why we’ve created this simple guide to common UK tax codes and what they mean, helping individuals and employers understand some of the codes they are most likely to come across.
How do tax codes work?
A tax code is made up of numbers and letters.
The numbers usually represent how much tax-free income you are entitled to receive, while the letters refer to your personal circumstances and how your tax should be calculated.
For example:
1257L
- 1257 represents the standard Personal Allowance of £12,570
- L means you are entitled to the standard tax-free allowance
Most employees will receive a tax code from HMRC, which is then provided to their employer so the correct amount of tax can be deducted from their salary.
Common UK tax codes explained
L Tax Codes
The most common tax code. If tax codes were ice cream flavours, this here is your classic vanilla.
L tax codes refer to people who are entitled to the standard Personal Allowance.
For the 2026/27 tax year, the standard Personal Allowance remains £12,570, meaning the most common tax code is still:
1257L
The numerical code before the “L” represents your tax-free allowance divided by 10.
For example:
£12,570 ÷ 10 = 1257
The L tax code generally applies to people who:
- Have one main job or pension
- Are entitled to the standard Personal Allowance
- Do not have adjustments affecting their tax-free allowance
Based in Scotland? You may see an S instead of an L code because Scottish Income Tax rates apply.
BR, D0 and D1 Tax Codes
These codes are less comparable to an ice cream flavour and more like the toppings or boujee waffle cone that comes with your scoop of choice.
These tax codes are commonly used when someone has more than one source of income.
For example:
- You have a second job alongside your main employment
- You receive income from multiple employers
- You have a pension alongside employment income
Typically, HMRC applies your Personal Allowance against your main source of income. Other income sources may then be taxed without any tax-free allowance.
The codes mean:
BR – all income is taxed at the basic rate
D0 – all income is taxed at the higher rate
D1 – all income is taxed at the additional rate
It is important that HMRC has accurate information about your different income sources to ensure the correct tax deductions are made.
No one wants an unexpected tax bill further down the line.
This is one of the reasons many business owners choose to work with an accountant for creatives to keep their finances organised.
T Tax Codes
Ice cream flavour: Venetian café-style affogato.
This is the tax code you may come across if you have a higher income and your tax situation requires adjustments.
T tax codes are used when HMRC needs to make changes to your Personal Allowance.
This could happen if, for example:
- Your income is high enough that your Personal Allowance is reduced
- You receive taxable benefits
- HMRC needs to make another adjustment
Once your income reaches £125,140, your Personal Allowance is reduced to £0. At this point, you may receive a 0T tax code, meaning no Personal Allowance is included.
Tax calculations become more complex at this stage, which is why many higher earners and business owners seek professional advice.
K Tax Codes
What ice cream flavour is it? Pistachio. If you’re eating it, you’re probably doing quite well. Yet no one really enjoys the experience.
K tax codes are used when the value of your untaxed income or benefits is greater than your Personal Allowance.
This often happens when someone receives taxable benefits, such as:
- A company car
- Private medical insurance
- Other taxable employee benefits
For example, if your taxable benefits are worth £15,000 and your Personal Allowance is £12,570, the excess amount needs to be collected through your tax code.
Rather than giving you tax-free income, a K code increases the amount of tax collected from your salary.
If your business provides employee benefits, it is important to make sure payroll records are accurate and up to date.
Our payroll services can help businesses manage employee payments, deductions and reporting requirements.
What does 1257L mean?
The 1257L tax code is the most common tax code in the UK.
It usually means:
- You receive the standard Personal Allowance
- You have one main source of employment income
- HMRC has no adjustments to make
If you have seen 1257L on your payslip, it usually means your tax situation is straightforward.
However, your tax code can change if your circumstances change.
What is an emergency tax code?
Emergency tax codes are temporary tax codes used when HMRC does not yet have enough information about your circumstances.
You might receive an emergency tax code if:
- You start a new job
- You receive your first pension payment
- You have not provided your employer with the correct information
Emergency tax codes often include:
- W1
- M1
- X
If you believe you are on the wrong tax code, it is worth checking your details with HMRC.
Why has my tax code changed?
There are several reasons why HMRC may change your tax code, including:
- Starting a new job
- Receiving a company benefit
- Changes to your salary
- Receiving pension income
- Paying back previously underpaid tax
- Changes to your Personal Allowance
If your tax code changes unexpectedly, check your HMRC Personal Tax Account first to understand why.
How to change an incorrect tax code
If you believe you have the wrong tax code, it is important to contact HMRC as soon as possible.
You can contact HMRC through their website, making sure you have your tax reference and National Insurance number available.
Alternatively, contact our team of accountants for creatives for advice on your personal or business finances.
We can also help your business stay organised with everything from payroll services to wider accounting support for small businesses.
