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Interpreting your tax code

Source: HM Revenue & Customs | | 26/06/2018

The letters in an employee’s tax code signify their entitlement (or not) to the annual tax free personal allowance. The tax codes are updated annually and help employer’s work out how much tax to deduct from an employee’s pay packet. 

The basic personal allowance for the tax year starting 6 April 2018 is £11,850 and the tax code for an employee entitled to the standard tax-free Personal allowance 1185L. This is the most common tax code and is used for most people with one job and no untaxed income, unpaid tax or taxable benefits (for example a company car).

There are many other numbers and letters that can appear in your tax code. For example, there are letters that show where an employee is claiming the marriage allowance (M) or where their income or pension is taxed using the Scottish rates (S). The basic rate limit for 2018-19 is £34,500 except for those defined as Scottish taxpayers who have a lower basic rate limit as well as an intermediate rate. If the numbers are changed this usually means your personal allowance has been reduced.

There are also emergency tax codes (W1 or M1) which can be used if a new employee doesn’t have a P45. These codes mean that an employee’s tax calculation is based only on what they are paid in the current pay period.

If your tax code has a 'K' at the beginning this means that deductions due for company benefits, state pension or tax owed from previous years are greater than your personal allowance. However, the tax deduction for each pay period can’t be more than half your pre-tax pay or pension.

It is important to check your tax code to ensure the correct information is being used. If you have any queries we can help or you can check with your employer or HMRC.



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