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Week 53 payments may result in an underpayment or overpayment of tax for the year. This is due to HMRC guidelines specifying that a Week 53 payroll must be calculated on a Week1/Month1 basis. Thus giving an additional personal allowance to protect the level of take home pay the employee receives.

The yearly tax allowance is calculated on a 52 week year. i.e. The Tax Code 1150L gives the employee a tax allowance of £11,505 for the 2017/18 tax year spread over 52 weeks, giving a free pay of £221.34 per week. For a week 53 calculation, the employee is given an additional free pay allowance of £221.34, therefore increasing the yearly allowance to £11,731.02. The difference is what HMRC will be requesting.

An overpayment will occur if within the 52 week year, an employee has not reached the £11,505.

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