This is for a small UK employer setting up payroll or thinking of changing the pay date. It compares the common frequencies, shows how one salary looks on each, and covers the rules that limit your choice: the written statement, minimum wage pay reference periods and the extra payday some years bring. The US version of this question is in our biweekly vs semimonthly post.
Is there a rule on how often you must pay?
GOV.UK sets no single required frequency. It requires that the written statement of employment particulars, given on the first day of employment, says how much and how often the employee will be paid. Once agreed, the frequency is part of the contract.
- Minimum wage: pay is checked over each pay reference period, which matches how often the worker is paid and can be up to one calendar month, never longer.
- Real Time Information: you send an FPS to HMRC on or before each payday, so more paydays means more submissions.
- Paying HMRC is separate: monthly by the 22nd, or quarterly if you usually pay less than £1,500 a month, whatever your payday frequency.
Weekly, four-weekly and monthly compared
| Weekly | Four-weekly | Monthly | |
|---|---|---|---|
| Paydays a year | 52 (53 in some years) | 13 (14 in some years) | 12 |
| Gross pay each payday | £500.00 | £2,000.00 | £2,166.67 |
| NI primary threshold for the period | £242 a week | £968 (4 × weekly) | £1,048 a month |
| Employee NI each payday (8%) | £20.64 | £82.56 | £89.49 |
| Employee NI for the year | £1,073.28 | £1,073.28 | £1,073.88 |
| FPS submissions a year | 52 | 13 | 12 |
Thresholds from HMRC's 2026 to 2027 employer rates page; four-weekly NI by CWG2's method (divide by 4, use the weekly table, multiply by 4). NI figures are our arithmetic on category A, before income tax. The small yearly difference comes from rounding in the period thresholds.
Income tax works the same way: each pay period gets its share of the tax-free allowance, £242 a week or £1,048 a month on a 1257L code, so the yearly total ends up close whichever frequency you use.
What 4 weekly pay means for staff
Four-weekly pay is a payday every 28 days, always on the same weekday. Thirteen paydays a year means one calendar month has two. Employees on salary get the same annual pay, split into 13 equal amounts instead of 12, so each payslip is smaller than a monthly one would be.
It suits employers whose rota or timesheets run in weeks, because each pay period holds exactly four whole weeks. Staff who budget by calendar month, with rent and bills due monthly, often find monthly pay easier, so ask before you choose.
Week 53 and the extra payday in 2026/27
Tax weeks run in 7-day blocks from 6 April, and the day or two left at the end of the tax year is treated as tax week 53. In 2026/27 the year starts on Monday 6 April 2026 and ends on Monday 5 April 2027, so a weekly payroll paid on Mondays has 53 paydays.
| Pay frequency | Usual paydays | Extra payday | Tax week number on the FPS |
|---|---|---|---|
| Weekly | 52 | 53rd | 53 |
| Fortnightly | 26 | 27th | 54 |
| Four-weekly | 13 | 14th | 56 |
| Monthly | 12 | None | Not applicable |
HMRC's guide says to treat the extra payday as a week 1 payment for employees on week 1 codes, and gives the tables to use for cumulative codes. Monthly payrolls never have one.
Changing pay frequency
Because the frequency is in the written statement, agree any change with your staff and confirm it in writing. HMRC's CWG2 explains how to handle the first payment after the change: moving to a shorter interval, work out NI on the new earnings period from the first payment; moving to a longer one, work out PAYE with the monthly table on the first payment after the change. Payroll software handles this if you set the change date correctly.
Where PayDocs fits
PayDocs makes payslips for weekly, fortnightly, four-weekly and monthly pay from your payroll figures, with the pay period and year-to-date totals on each. PayDocs works out PAYE income tax, National Insurance and supported deductions for 2026/27 pay dates. It doesn't send FPS submissions to HMRC. Previewing is free; a PDF is £3.99 per payslip once checkout opens.
This is general information about UK rules for the 2026/27 tax year, as published on 8 October 2026. It is not tax or legal advice.
Questions
Is there a rule on how often you must pay?
GOV.UK sets no single frequency. The written statement, given on the first day, must say how often the employee is paid, and minimum wage pay reference periods can't be longer than one calendar month.
What does 4 weekly pay mean?
A payday every 28 days, on the same weekday. That gives 13 paydays a year instead of 12, so one calendar month has two paydays and each payslip is a 13th of the annual salary.
Do you pay more tax on weekly or monthly pay?
Not over a year. Tax and National Insurance thresholds are set per pay period, so on £26,000 employee NI comes to about £1,073 a year whether you pay weekly, four-weekly or monthly.
What is week 53?
The extra payday a weekly payroll gets when 53 paydays fall in one tax year. In 2026/27 that happens for weekly payrolls paid on Mondays, because the tax year starts and ends on a Monday.
Can I change my employees' pay frequency?
Yes, by agreement, because the pay frequency is part of the written statement. Confirm it in writing and follow HMRC's CWG2 rules for the first payment after the change.
Sources
- GOV.UK: Employment contracts, written statement of employment particulars
- GOV.UK: Calculating the minimum wage, pay reference periods
- GOV.UK: Rates and thresholds for employers 2026 to 2027
- HMRC: CWG2 (2026 to 2027), Employer further guide to PAYE and National Insurance contributions
- GOV.UK: Running payroll, paying HMRC
- GOV.UK: Running payroll, reporting to HMRC
Sources checked 8 October 2026. This article explains how pay documents work; it is not tax or legal advice.
