Hundred SummersTake-home pay calculator: the statutory arithmetic, including the traps
Income tax on the real bands (rUK or Scottish), National Insurance, and your student loan plan, from an annual salary or an hourly rate, plus the number payslips never show: your true marginal rate, which quietly hits 62% between £100,000 and £125,140. The same functions the Hundred Summers engine charges in every projected year. Your figures never leave your browser.
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Worked example
Computed when this page was built by the same engine that runs the calculator above, so the figures below and the live tool can never disagree. Change any input above to see your own.
| Inputs | |
|---|---|
| Salary | £45,000 |
| Scottish taxpayer | No |
| Student loan | None |
| Results | |
|---|---|
| Income tax | £6,486 |
| National Insurance | £2,594 |
| Take-home a year | £35,920 |
| A month | £2,993 |
| Marginal rate on the next £1 | 28% |
| Effective rate | 20.2% |
The next question
What's left over each month? →Household budget calculator
Or answer it with everything else: the full Hundred Summers plan connects your pay, pensions, savings, property, tax and spending year by year, and stress-tests them across 500 simulated market histories.
Read the guides
- The 60% tax trap: earning between £100,000 and £125,140 →Why every pound between £100,000 and £125,140 is effectively taxed at 60% (62% with NI), how the personal allowance taper creates it, and why pension contributions in this zone get the best relief in the UK tax system.
- Bonuses: why so much disappears, and the move that keeps it →A bonus is taxed as the top slice of the year's pay, so it lands at your highest rate plus NI (42% gone for a higher-rate earner, more in the 60% zone), and a bonus sacrificed into a pension is the best-relieved contribution most employees ever make.
What sets your take-home
Three deductions do the work: income tax above the £12,570 personal allowance (Scotland has its own bands), employee National Insurance at 8% between £12,570 and £50,270 and 2% beyond, and a student loan that behaves like a 9% tax above your plan's threshold. The interesting number is the marginal rate, what your next pound keeps, because that's what a pay rise, bonus or pension contribution is really priced at.
Pension contributions are the lever: by salary sacrifice they cut every line above at once. The full Hundred Summers plan runs this arithmetic for every year of your life, not just this one.