Your net salary breakdown is computed using the latest official HMRC tax rules for the 2026/2027 financial year. First, standard workplace salary sacrifice pension allocations are factored out of your gross earnings. The remaining figure is evaluated against the frozen £12,570 Personal Allowance. Earnings above this amount are processed through the core tax brackets (20% Basic, 40% Higher, and 45% Additional), alongside updated National Insurance thresholds.
Earning above £100,000 activates a hidden marginal taxation model. For every £2 earned above £100,000, your tax-free Personal Allowance drops by £1. This tapering creates a 60% effective marginal tax zone between £100,000 and £125,140. High earners can use our pension contribution input tool to plan salary sacrifices that drop their taxable income back to £100,000, successfully preserving their personal allowance.