Last updated: 16 October 2026
Does a year with 53 Mondays mean 53 times the tax?
No. The 2026/27 tax year runs from Monday 6 April 2026 to Monday 5 April 2027, so it contains 53 Mondays. Employers who pay staff weekly on a Monday will make 53 payments in the year, and some pensioners notice an extra payment date. But tax is worked out on income for the tax year, and the PAYE system has special rules to stop allowances being given twice.
How week 53 works in payroll
Tax codes give an allowance spread over 52 weeks. When there is a 53rd pay day, payroll software runs that payment on a “week 53” basis. The employee gets one week’s allowance (1/52 of the annual amount) for that payment only, not on a cumulative basis. This means:
- the extra payment is taxed using just one week’s allowance
- the employee may end up paying slightly less tax than due for the year
- HMRC may collect the difference later through a P800 calculation or a tax code adjustment
Which pay frequencies are affected?
| Pay frequency | When it happens in 2026/27 |
| Weekly, paid on Mondays | Week 53 payment on 5 April 2027 |
| Two-weekly | Week 54 if a pay day falls on the final day |
| Four-weekly | Week 56 in some years |
| Monthly | Not affected |
If your pay day is any other day of the week, you will usually have 52 pay days in 2026/27, unless bank holidays move pay dates.
The State Pension
The State Pension is paid every four weeks, with the pay day depending on your National Insurance number. Pensioners are taxed on the State Pension that accrues for the tax year, not on the number of payments that happen to fall in it. The full new State Pension is £241.30 a week in 2026/27, about £12,548 for the year. An extra payment date falling in the tax year does not mean you are taxed on an extra four weeks.
What employers should check
- Confirm your payroll software supports week 53.
2. Check pension scheme contributions for the extra pay period.
3. Check auto-enrolment and minimum wage calculations, which are worked out per pay period.
4. Tell employees in advance that the extra payment may be taxed differently.
Example
Jake is paid £500 every Monday and has a 1257L tax code. For weeks 1 to 52 his tax is worked out cumulatively. His 53rd payment of £500 on 5 April 2027 gets a one-week allowance of about £242, so roughly £258 is taxed at 20%, about £52. Over the year he earns £26,500 with 53 weeks of allowances, so HMRC may ask for a small amount back.
Frequently asked questions
Does week 53 affect National Insurance?
NIC is worked out per pay period, so the week 53 payment uses the weekly thresholds.
Will I get an extra week’s pay?
Your annual salary does not change, but if you are paid weekly you may get 53 pay days.
Is week 53 a problem for salaried staff paid weekly?
Some employers divide the annual salary by 53 to avoid overpaying.
When is the next 53-Monday tax year?
Years where 6 April falls on a Monday, or on a Sunday in a leap year.
Related: what RTI is, paying tax on the State Pension and tax code 647L or 747L.
Talk to Accotax
Want this handled for you? Our team at Accotax can help with payroll and pension tax queries. See our payroll services service, or contact us for a free, no-obligation quote.
This page is general guidance based on HMRC rules for the 2026/27 tax year, checked against gov.uk on 16 October 2026. It is not personal advice, so speak to an accountant about your own situation.
