How NetSlip calculates UK take-home pay
A transparent explanation of the assumptions behind NetSlip salary figures. Our salary guides are planning estimates, calculated from published UK tax and National Insurance rules rather than copied from third-party salary tables.
2026/27 baseline assumptions
£12,570
Reduced by £1 for every £2 of adjusted net income above £100,000.
20% / 40% / 45%
Basic, higher and additional Income Tax rates.
8% / 2%
Standard Class 1 employee rates across the main and upper bands.
19%–48%
Separate Scottish non-savings Income Tax bands are used where selected.
What a standard salary-guide figure includes
For a standard employee example, NetSlip starts with annual gross employment income, applies the relevant Personal Allowance and Income Tax bands, then calculates employee Class 1 National Insurance. The resulting annual take-home figure is gross pay minus estimated Income Tax and employee NI.
Monthly and weekly figures are annualised planning figures. Actual payroll can differ slightly because PAYE is operated by pay period, tax code, cumulative basis and payroll rounding.
What is not assumed unless you choose it
Headline salary-guide figures do not silently assume pension contributions, student-loan repayments, benefits in kind, bonuses, salary sacrifice, a second job or a non-standard tax code. Those circumstances can materially change take-home pay, so NetSlip provides separate calculators and guides for them.
Official sources and verification
Rates are checked against HMRC/GOV.UK material for the relevant tax year. For 2026/27 this includes the published Income Tax rates and allowances, Scottish bands and Class 1 National Insurance thresholds and rates.
Primary sources: GOV.UK Income Tax rates · GOV.UK National Insurance · HMRC 2026/27 rates and thresholds.
Last methodology review: 7 September 2026. We re-check the model when a new tax year or relevant fiscal change takes effect.
Use the figures properly
NetSlip is designed for comparison and planning, not as a substitute for an employer's payroll calculation or personalised tax advice. If your tax code, pension method, student loan, benefits or employment pattern is unusual, use the relevant NetSlip calculator and compare the result with your payslip or HMRC information.