Tax Codes

LettersWhat they mean
LYou’re entitled to the standard tax-free Personal Allowance
MMarriage Allowance: you’ve received a transfer of 10% of your partner’s Personal Allowance
NMarriage Allowance: you’ve transferred 10% of your Personal Allowance to your partner
TYour tax code includes other calculations to work out your Personal Allowance
0TYour Personal Allowance has been used up, or you’ve started a new job and your employer does not have the details they need to give you a tax code
BRAll your income from this job or pension is taxed at the basic rate (usually used if you’ve got more than one job or pension)
D0All your income from this job or pension is taxed at the higher rate (usually used if you’ve got more than one job or pension)
D1All your income from this job or pension is taxed at the additional rate (usually used if you’ve got more than one job or pension)
NTYou’re not paying any tax on this income
SYour income or pension is taxed using the rates in Scotland
S0TYour Personal Allowance has been used up, or you’ve started a new job and your employer does not have the details they need to give you a tax code
SBRAll your income from this job or pension is taxed at the basic rate in Scotland (usually used if you’ve got more than one job or pension)
SD0All your income from this job or pension is taxed at the intermediate rate in Scotland (usually used if you’ve got more than one job or pension)
SD1All your income from this job or pension is taxed at the higher rate in Scotland (usually used if you’ve got more than one job or pension)
SD2All your income from this job or pension is taxed at the top rate in Scotland (usually used if you’ve got more than one job or pension)
CYour income or pension is taxed using the rates in Wales
C0TYour Personal Allowance has been used up, or you’ve started a new job and your employer does not have the details they need to give you a tax code 
CBRAll your income from this job or pension is taxed at the basic rate in Wales (usually used if you’ve got more than one job or pension) 
CD0All your income from this job or pension is taxed at the higher rate in Wales (usually used if you’ve got more than one job or pension) 
CD1All your income from this job or pension is taxed at the additional rate in Wales (usually used if you’ve got more than one job or pension)

If your tax code has ‘W1’ or ‘M1’ at the end

These are emergency tax codes.

source: https://www.gov.uk/tax-codes