What is a tax code?

Annabel Barnes • 11 May 2022

What is a tax code?

Do you know your tax code? If not, you're not alone. Many people in the UK don't know what their tax code means or what it does.

HMRC tax codes are used to indicate to employers and pension providers how much tax should be deducted from an employee's wages. There are many different tax codes in the UK, and each one has a different meaning.



If you don’t know what your tax code is you can check it online
here


Every year HMRC will send out a letter to you which contains your tax code. 

There are standard codes for each tax year. Your tax code depends upon your circumstances; it may contain different numbers or letters. 


Emergency tax codes


From 6th April 2022 emergency tax codes are as follows:


  • 1257L W1
  • 1257L M1
  • 1257L X


Why would I need an emergency tax code?


If you start a new job you may be put on an emergency tax code or if you start employment after being self-employed. This will be because your new employer will not have received your P45 and therefore doesn’t know enough information about you. Being on an emergency tax code will mean you pay over the amount of your personal allowance but it will only be a temporary measure.



Regular tax codes


For most people who only have one job or pension their tax code would usually be 1257L.


What do the letters mean in my tax code?


  • L- Standard tax-free personal allowance
  • M - Marriage allowance - you have received 10% of your partner’s personal allowance
  • N - Marriage allowance - you have transferred 10% of your personal allowance to your partner
  • T - Your tax code includes other calculations to work out your Personal Allowance
  • 0T - Your personal allowance has already been used up or you’ve started a new job and your new employer doesn’t have the details they need in order to give you  tax code.
  • BR - All your income is taxed at the Basic rate. This usually means that you have more than one job or pension
  • D0 - All your income and pension is taxed at the higher rate, again this is usually when you have more than one job or pension
  • D1 - All your income is taxed at the additional rate, usually if you have more than one job or pension
  • NT - You don’t pay tax
  • S - Scottish rates - there are various tax codes starting with an S which relate to Scottish rates
  • C - Welsh rates - there are various tax codes starting with a C which relate to Welsh rates
  • K - you have income that is not being taxed and is worth more than your tax-free allowance.


If you need any assistance with tax codes please get in touch



Get in touch
by Annabel Barnes 19 March 2026
Here are five clear signs you’ve outgrown your current bookkeeping setup (and what to do next).
by Annabel Barnes 4 March 2026
Running a charity is about impact; supporting people, funding vital services, and making a real difference in your community. But behind every successful charity is something far less visible (and often far less loved): the finances.
Construction site
by Annabel Barnes 18 February 2026
If you work in construction, you already know it’s not a “simple” business. You’ve got multiple jobs on the go, materials flying in and out, subcontractors, vans, tools, and payments that don’t always land when you expect them to.
Financial report
by Annabel Barnes 4 February 2026
Profit margins are one of the simplest numbers in business and one of the most powerful.
Grant folder on desk
by Annabel Barnes 21 January 2026
From application to reporting, every pound needs to be tracked, justified, and maximised. But with the right systems and a few expert tips, grant management doesn’t have to be a headache.
woman with notebook
by Annabel Barnes 7 January 2026
setting goals is one thing, but achieving them? That’s where the real work begins. And that’s exactly where your bookkeeper comes in.
Beauty Salon
by Annabel Barnes 25 December 2025
For beauty business owners, managing cash flow can feel like a full-time job in itself. With the constant juggle of appointments, product orders, staff schedules, and client payments, it’s easy for finances to slip down the priority list.
holding hands
by Annabel Barnes 11 December 2025
One important thing to know is what expenses you can and can’t claim through your business. Making sure you’re claiming every tax deduction you’re entitled to
lady stressed at computer
by Annabel Barnes 27 November 2025
Between keeping funders happy, supporting your beneficiaries and juggling a mostly voluntary team, finding the time and headspace to pull together your annual accounts can feel like a lot. The good news? With some simple habits and a clear checklist, preparing your charity’s annual accounts doesn’t have to be stressful
Construction tools and calculator
by Annabel Barnes 12 November 2025
Running a construction business comes with unique financial challenges. Between managing multiple projects, tracking materials costs, coordinating subcontractors, and dealing with payment delays, it's easy for the numbers to become overwhelming. Yet, regular financial reporting isn't just about keeping your books tidy,