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The tax code is just a series of numbers and letters that tells HMRC how much tax you should be paying.
The numbers in your tax code tell your employer or pension provider how much tax-free income you are entitled to in that tax year.
|L||You’re getting the standard tax-free Personal Allowance. This tax code is the most common one|
|M||10% of your partner’s personal allowance goes to you|
|N||10% of your personal allowance goes to your spouse|
|S||You’re using the Scottish rate of income tax|
|T||Other: your tax code includes other calculations|
|Y||You were born before 6 April 1938, and get a higher personal allowance|
|0T||Your Personal Allowance has been used up or you’ve started a new job|
|BR||You’re getting the basic rate|
|D0||You’re getting the higher rate|
|D1||You’re getting the additional rate|
|NT||You’re not paying tax on this income|
|K||You have income that isn’t being taxed another way and it’s worth more than your tax-free allowance|
If you’re not sure what basic rate, higher rate, etc. means, read more about the UK income tax rates and tax bands here.
The most common one for 2020/21 will be 1250L:
If you take a second job, then you don’t get a personal allowance for this one, so you need to make sure that the job that pays you the most is the one with “L” and not “BR”.
You should contact HMRC as soon as possible — they can sort it out for you.