Reverse Salary Calculator
Work backwards from your target take-home pay. Enter what you want to see in your bank account each month — we'll find the gross salary you need after income tax, NI, student loan and pension, for both England/Wales/NI and Scotland.
Required Gross Salary
£36,777
per year
Your Take-Home Pay
£29,999
per year
Effective Tax Rate
18.4%
of gross income
| Item | Annual | Monthly | Weekly |
|---|---|---|---|
| Gross Salary | £36,777 | £3,065 | £707 |
| Income Tax | £4,841 | £403 | £93 |
| National Insurance | £1,937 | £161 | £37 |
| Total Deductions | £6,778 | £565 | £130 |
| Take-Home Pay | £29,999 | £2,500 | £577 |
Why reverse tax is non-linear
Personal Allowance changes the ratio
The first £12,570 is tax-free. If your target take-home is £1,500/month (£18k/year), most of the gross sits inside the allowance — you need barely more gross than net. At higher targets, more earnings fall into taxed bands.
Progressive bands steepen the curve
Basic rate costs 28% (20% tax + 8% NI), higher rate costs 42% (40% tax + 2% NI), additional rate costs 47%. Each £100 of extra take-home costs progressively more gross as you climb bands.
The £100k trap spike
Between £100,000 and £125,140, your personal allowance is withdrawn at £1 for every £2 earned — creating an effective 62% marginal rate. The gross cost per £100 of take-home jumps dramatically through this zone.
Student loans and pension add layers
Student loan (9% Plan 1/2/4/5 or 6% postgrad over the threshold) and pension contributions (typically 5% via auto-enrolment) each layer on top. The more deductions you have, the more gross you need for the same net.
Frequently asked questions
How does a reverse salary calculator work?
A reverse salary calculator works backwards from your target take-home pay. Instead of entering a gross salary and seeing the net, you enter your desired monthly, annual or weekly take-home amount and the calculator finds the gross salary needed after income tax, National Insurance, student loan repayments and pension contributions.
What gross salary do I need to take home £3,000 a month?
To take home £3,000 per month (approximately £36,000 net per year) in England, Wales or Northern Ireland, you need a gross salary of roughly £47,000–£49,000 depending on pension contributions and student loan plan. The exact figure varies with your student loan plan, pension percentage and whether you are on Scottish rates.
How much does £100 of take-home pay cost in gross terms?
In the basic-rate band (20% income tax + 8% NI), £100 of additional take-home pay costs about £139 in gross salary. In the higher-rate band (40% + 2% NI), it costs about £172 per £100. At the £100k–£125,140 personal allowance taper zone, the effective marginal rate hits 62%.
Does the reverse salary calculator work for self-employed people?
The reverse salary calculator targets PAYE employees and shows Class 1 employee NI. Self-employed workers pay Class 2 and Class 4 NI at different rates and thresholds. For self-employed calculations, use our Self-Employment Tax Calculator instead.
Does the calculator handle the £100,000 tax trap?
Yes. The calculator correctly applies personal allowance tapering between £100,000 and £125,140, giving an effective 62% marginal rate in this band. If your target take-home falls in this range, the gross salary needed will reflect the steep marginal cost.