Working fewer days: how much take-home pay would you lose?
Compare five-, four- and three-day pay with a worked UK example. Understand pro-rata salary, compressed hours, deductions and commuting savings.
Quick answer
For equal-length days and proportionately reduced paid hours, multiply full-time salary by new days ÷ full-time days, then calculate deductions on the new salary. A 20% cut in gross pay need not be a 20% cut in take-home pay. Compressed hours over fewer days are different: the same paid hours may keep the same salary.
Start with the proposed contract, not the number of days alone. This guide compares reduced hours with proportionately reduced pay. The worked table uses the site’s 2026/27 employment tax calculation and is not a personalised payroll quote.
1. Establish the actual salary offered
A £50,000 full-time equivalent over five equal days becomes £40,000 at four days, or £30,000 at three, if pay scales directly with hours. For uneven days, use contracted weekly hours instead: full-time salary × new paid hours ÷ full-time paid hours.
Check whether an advertised number is the full-time equivalent or the actual part-time salary. Four compressed days with the same total paid hours are not the same proposal as four shorter days with 80% pay. Unpaid breaks can also make hours different from time spent at work.
2. Compare net pay after recalculating deductions
The table below starts at £50,000 and recalculates Income Tax and employee National Insurance for each annual salary. It assumes England, Wales or Northern Ireland, one employment for the full year, standard allowance and NI, and no pension, student loan or other income.
Monthly figures are annual estimates divided by 12. Scotland uses different Income Tax bands. PAYE rounding, irregular pay and your tax code can make a payslip differ. Use the take-home calculator with your own deductions before comparing offers.
| Days per week | Annual gross | Net per month | Monthly net reduction |
|---|---|---|---|
| 5 | £50,000.00 | £3,293.30 | £0.00 |
| 4 | £40,000.00 | £2,693.30 | £600.00 |
| 3 | £30,000.00 | £2,093.30 | £1,200.00 |
3. Account for pension and other deductions
A workplace pension can reduce the cash figure and affect the difference between schedules. Contributions might apply to qualifying earnings, full salary or another pensionable-pay definition. Employer payments and salary sacrifice are separate considerations; ask for the actual arrangements.
Student loan deductions and income-related support can also change when earnings change. Compare the whole household position where relevant, including a partner’s income, childcare and benefits. The table does not calculate these effects.
4. Compare costs you really avoid
Use the change in take-home pay as a starting point, then subtract work costs that genuinely disappear. If commuting costs fall by an illustrative £80 a month, a £600 net monthly pay reduction becomes a £520 gap before other changes. The £80 is an example, not an assumed saving for every worker.
Check whether a season ticket or childcare place remains payable on the day off. Fixed monthly costs might not fall proportionately. A compressed schedule may reduce journeys while keeping the same hours, but longer days may change childcare needs.
- Confirm actual annual salary and paid weekly hours.
- Recalculate tax, NI, pension and loan deductions.
- Compare only commuting and childcare costs you can avoid.
- Check holiday, benefits and pension terms in the proposed contract.
- Consider whether workload expectations fall with paid hours.
5. Compare hourly value as well as the monthly gap
At £50,000 over 37.5 hours and 52 paid weeks, the gross hourly equivalent is £25.64. At £40,000 over 30 hours with the same paid weeks, it remains £25.64. The monthly amount falls, but the hourly equivalent is unchanged in this proportional example.
A compressed schedule at the same salary and hours also keeps that hourly equivalent. If workload or unpaid time stays unchanged after a pay cut, the effective rate for all time spent working can instead fall. Use the salary-to-hourly calculator with the hours you intend to compare.
Sources and worked-example method
Checked 12 October 2026. Examples are explicitly illustrative unless marked as dated provider prices. Confirm your supplier, contract or scheme terms before acting.
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