How We Calculate: UK Salary (Take-Home Pay)
Exact formulas, variables, and assumptions
Formula
Variables
What This Calculator Does
The UK salary calculator converts your gross annual salary into take-home pay by applying HMRC’s income tax bands, National Insurance contributions, student loan repayments, and pension contributions — all using verified 2025/26 tax year rates.
The calculation follows the same logic HMRC uses: start with gross income, determine the Personal Allowance, calculate tax on the taxable portion through progressive bands, add NI contributions, subtract student loan repayments if applicable, and deduct pension contributions.
Income Tax (2025/26)
Income tax is applied to taxable income (gross salary minus Personal Allowance) through progressive bands:
| Band | Taxable Income | Rate |
|---|---|---|
| Personal Allowance | First £12,570 | 0% |
| Basic Rate | £12,571 to £50,270 | 20% |
| Higher Rate | £50,271 to £125,140 | 40% |
| Additional Rate | Over £125,140 | 45% |
Personal Allowance Taper: For income above £100,000, the Personal Allowance is reduced by £1 for every £2 earned. This creates an effective marginal rate of 60% between £100,000 and £125,140 — you lose £1 of allowance (worth 40p in tax) for every £2 earned, on top of the 40% rate.
Scottish Residents: Scotland has its own six-band income tax system with rates from 19% (Starter) to 48% (Top). Toggle the Scottish resident option to apply these bands instead.
National Insurance (Employee Class 1)
NI is calculated on earnings, not taxable income (pension relief does not reduce NI unless using salary sacrifice):
- Primary Threshold to Upper Earnings Limit (£12,570 to £50,270): 8%
- Above Upper Earnings Limit (over £50,270): 2%
Earnings below £12,570 incur no NI.
Student Loan Repayments
Repayments are 9% of income above the plan-specific threshold (6% for postgraduate loans):
| Plan | Threshold (2025/26) | Rate |
|---|---|---|
| Plan 1 (pre-2012 England/Wales) | £26,065 | 9% |
| Plan 2 (post-2012 England/Wales) | £28,470 | 9% |
| Plan 4 (Scotland) | £32,745 | 9% |
| Plan 5 (from 2023) | £25,000 | 9% |
| Postgraduate Loan | £21,000 | 6% |
Pension Contributions
Two modes are available:
Salary Sacrifice: The pension contribution is deducted before tax and NI are calculated. This saves both income tax and NI. A 5% salary sacrifice contribution on a £40,000 salary reduces both tax and NI liability.
Personal Contribution: Deducted from net pay. Your pension provider claims basic rate tax relief (20%) from HMRC automatically. Higher rate taxpayers must claim the additional relief through self-assessment.
Tax Code Parsing
The calculator recognizes common HMRC tax codes:
- 1257L (standard): Uses normal Personal Allowance calculation
- BR/D0/D1: Flat-rate codes — all income taxed at basic/higher/additional rate
- NT: No tax
- K codes (e.g., K475): Negative allowance — adds to taxable income (used when benefits in kind exceed your allowance)
- S prefix: Scottish bands apply
- C prefix: Welsh rates apply (currently identical to England)
Common Misconceptions
The 60% effective rate between £100,000 and £125,140 surprises many people. It is not a separate tax band — it’s the combined effect of the 40% rate plus the Personal Allowance taper. Pension contributions that reduce income below £100,000 can be highly tax-efficient for this reason.
Another misconception: “salary sacrifice costs me money.” For most employees, salary sacrifice pension contributions are strictly better than personal contributions because they save NI (8% or 2%) on top of income tax. The trade-off is a slightly lower gross salary for mortgage and loan applications.
Why This Calculator Exists
HMRC’s own online tools are basic and don’t handle Scottish tax, custom tax codes, or salary sacrifice pensions in a single interface. This calculator combines all of these into one tool with instant results, showing annual, monthly, weekly, and daily take-home figures.
Assumptions
- ✓ Uses 2025/26 tax year rates and thresholds
- ✓ Standard tax code 1257L unless a custom tax code is entered
- ✓ Employee is aged under State Pension age (NI Class 1 applies)
- ✓ Pension contributions are either salary sacrifice (reduces taxable income and NI-able earnings) or personal (post-tax, no NI reduction)
- ✓ Only one student loan plan is active at a time
- ✓ Scottish income tax bands apply when the Scottish resident toggle is selected
- ✓ No additional income sources (dividends, rental income, savings interest)
Limitations
- ⚠ Does not model employer NI contributions (15% above £5,000 for 2025/26)
- ⚠ Does not include tax on benefits in kind (company car, private medical, etc.)
- ⚠ Does not model Marriage Allowance transfer (10% of PA transferable between spouses)
- ⚠ Does not handle multiple concurrent student loan plans
- ⚠ Does not calculate tax relief on pension contributions above the annual allowance (£60,000)
- ⚠ Does not model Child Benefit High Income Charge (clawback above £60,000)
- ⚠ Does not include the dividend allowance (£500 for 2025/26) or savings interest allowance
- ⚠ Tax code parsing handles common codes (numeric+L, K codes, BR, D0, D1, NT) but not all HMRC codes
Try the calculator
Run your own numbers with the UK Salary & Take-Home Calculator.
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