£12.71 vs £15 an Hour: The Monthly Pay Difference
Compare £12.71 and £15 an hour at 37.5 paid hours a week, including annual salary, monthly take-home and contract checks.
Direct answer: At 37.5 hours a week, moving from £12.71 to £15 an hour adds about £268 a month after Income Tax and National Insurance.
Assumptions: England, Wales or Northern Ireland; 37.5 paid hours a week for 52 weeks; standard 1257L tax code; 2026/27 rates; no pension or student loan.
The calculated comparison
| Scenario | Gross salary | Income Tax | National Insurance | Other deduction | Take-home a month |
|---|---|---|---|---|---|
| £12.71/hour | £24,785 | £2,443 | £977 | None | £1,780 |
| £15/hour | £29,250 | £3,336 | £1,334 | None | £2,048 |
An hourly rate only becomes meaningful with paid hours
The same hourly rate can produce very different annual pay depending on contracted hours, unpaid breaks and how many weeks are paid. This comparison holds the working pattern constant so the change in the table comes from the rate rather than from a different schedule.
The annual salary uses paid hours across a full year. If a role is term-time, seasonal, zero-hours or regularly interrupted by unpaid leave, multiply the rate by the hours you genuinely expect to be paid instead of treating the full-year figure as guaranteed income.
Check the whole package, not just the headline pay
Employers sometimes quote a higher rate for a role with fewer benefits or less predictable work. Compare the employment status, holiday arrangement, sick pay, pension, overtime policy and guaranteed minimum hours alongside the rate.
- Confirm whether breaks are paid and whether preparation or closing time counts as work.
- Check the minimum guaranteed hours rather than relying on a typical rota.
- Ask whether overtime attracts the normal rate or an enhanced rate.
- Find out whether holiday pay is paid when leave is taken or rolled into the rate.
- Compare travel time and commuting costs if the roles are in different locations.
Why take-home does not rise in a straight line
Income Tax and National Insurance apply through thresholds and bands. As annual gross pay increases, part of the extra earnings may enter a different band. The monthly figures in the table run both annual salaries through the same tax engine instead of subtracting one flat percentage.
Pension and student-loan deductions are not included in the standard comparison. Add them in the calculator if either role uses a different pension scheme or if the higher annual pay changes a loan repayment.
What can change your actual payslip
Use the expected rota, not the advertised maximum, for a cautious budget. If hours vary, calculate a low, normal and busy month. That shows whether the higher rate actually improves dependable income and how much of the apparent gain depends on overtime being available.
Run the numbers for your own situation
Official references: Figures use the 2026/27 Income Tax rates, employee National Insurance rates. Figures are estimates; payslip timing and individual circumstances can change the result.