Why has my tax code changed?

“How do I know if my tax code is correct?”

Your tax code is used by your employer to calculate how much tax needs to be deducted from your pay. HMRC tells your employer which code to use to collect the right amount of tax from you. You can check your income tax online to see what your tax code is, how your tax code has been worked out and how much tax you have paid and are likely to pay in the coming months.

“What does my tax code actually mean?”

Your tax code represents how much tax free income you have for that tax year, for example the standard tax code for the 2018/19 tax year is 1185L and this means you have a tax free income of £11,850.

“What does the letter in my tax code mean?”

The letter in your tax code represents your situation and how that affects your tax free income, for example:

  • L = You’re entitled to the standard tax free allowance.
  • M & N = Marriage Allowance, this means you have either transferred or received personal allowance to or from your partner.
  • 0T = Your personal allowance has been used up or you’ve started a new job and your employer doesn’t have all of your starter details.

To see the full list on the HMRC website please click here.

“Why is there a W1/M1 at the end of my tax code?”

The W1/M1 means that the tax code is non-cumulative; in these cases tax will be calculated purely based on the taxable pay for that pay period. Each pay day is treated as if it is the first week or month of the tax year. All previous pay and tax are ignored.

There are a few reasons you may have been put on this type of code, for example:

  • Started a new job
  • Getting Company benefits or state pension
  • Becoming employed after being self employed

These tax codes are generally temporary and you or your employer can update this.

“How do I change my tax code?”

 You can use the HMRC online services to tell HMRC about any missing or incorrect information. They will then update this by sending you and your employer a P6 tax coding notice. If you can’t use the online services you can call HMRC on 0300 200 3300 and they will help guide you through and get your tax code updated.

If you would like to discuss this further then please get in touch on 0116 242 3400.

Polly Dennis, Payroll Assistant 

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