Calculation Methodology & Legislation
How Your Calculation Works (United Kingdom • 2026-27)
This calculation tool operates strictly in accordance with statutory tax brackets and financial schedules published by HM Revenue & Customs (HMRC) for the 2026-27 fiscal tax year (UK Finance Act 2025/2026).
This tool converts your annual gross pay into standard payroll periods (52 weeks, 260 working days, 1,950 hours for a 37.5 hour week) and applies statutory Income Tax and National Insurance to give accurate gross and net figures across all frequencies.
Core Mathematical FormulaStatutory 2026-27
Net Take-Home = Gross Salary − Income Tax (20%/40%/45%) − National Insurance (8%/2%) − Pension Contribution − Student Loan RepaymentStatutory Allowances & Deductions
Basic Personal Allowance / Exemption
Standard £12,570 Personal Allowance provides 100% tax-free income on foundational earnings before the 20% basic rate applies.
Reliefs & Allowable Deductions
Pension salary sacrifice reduces both Income Tax (20%/40%) and Class 1 National Insurance (8%), maximizing take-home efficiency.
Statutory Authority Verified (2026-27)Audited against published schedules from HM Revenue & Customs (HMRC).