UK Marginal Tax Rate & Household Tax Calculator
Model your real marginal tax rate across all statutory bands. Discover how the £100,000 personal allowance taper, £100k childcare cliff edge, and High Income Child Benefit Charge (HICBC) impact your take-home pay, with single or dual-earner couple optimization.
Standard Tax Assessment (Current Baseline)
Household & Income Parameters
InputsCapped at £60k annual allowance, ensuring cash earnings stay above National Living Wage floor (£24,785/yr).
Children & Dependents (HICBC & Free Childcare Cliff) ▸
Tax Assessment Overview
Enter your gross salary to calculate your exact take-home pay, view tax sliced by bracket, and see if the £100,000 allowance taper or childcare cliff applies to you.
Childcare & Family Benefits (Optional / As Applicable) ▸
Statutory Childcare Act cliff: If either parent's Adjusted Net Income exceeds £100,000, 100% of funded nursery hours and Tax-Free Childcare are lost.
HMRC clawback: Assessed on the lead earner between £60,000 and £80,000 at 1% per £200 over £60,000 (ITEPA 2003 s 681B).
Tax Optimization & Scenario Analysis
Wealth Allocation & Take-Home Visualizer
Shows how salary sacrifice reallocates cash in hand to pension wealth and restores family benefits.
Model Salary Sacrifice
InteractiveTotal sacrifice (current £0 + additional +£0 = £0) capped at £60k allowance.
Household Financial Impact
BaselineClear comparison of usable cash flow vs. retirement wealth accumulation
▶View Full Statutory Tax Bands & NI Audit TrailStatutory PAYE Slices
Scenario Comparison Matrix
Current Baseline vs. Optimized PlanFrequently Asked Questions & Statutory Authority
Common Questions & Calculations
Schema.org FAQWhat is the UK 60% tax trap?▼
Under Section 35 of the Income Tax Act 2007, an individual’s tax-free Personal Allowance (£12,570) is reduced by £1 for every £2 of Adjusted Net Income exceeding £100,000. Because £2 of earnings loses £1 of allowance, you pay 40% higher rate tax on that £1, effectively adding 20% tax on top of your 40% bracket. This produces a 60% effective marginal tax rate between £100,000 and £125,140 (plus 2% National Insurance).
How does pension salary sacrifice eliminate the 60% marginal rate?▼
Contributing into a registered pension scheme lowers your statutory Adjusted Net Income (ANI) under ITA 2007 s 58. If your gross salary is £115,000 and you sacrifice £15,000 into your pension, your ANI drops to £100,000. Your full £12,570 personal allowance is completely restored, saving £9,000 in income tax while creating £15,000 in retirement wealth.
What is the £100,000 free childcare cliff edge?▼
Under the Childcare Payments Act 2014, eligibility for 15/30 hours funded nursery places and Tax-Free Childcare ceases completely if either parent earns £1 over £100,000 Adjusted Net Income. Unlike income tax, there is no taper—a parent earning £100,001 loses the full £2,000/year Tax-Free Childcare subsidy plus thousands in free nursery hours.
What happens to National Insurance and the tax trap once you reach State Pension age?▼
Under Section 6(1) of the Social Security Contributions and Benefits Act 1992 (SSCBA 1992), employees who reach UK State Pension age are completely exempt from paying primary Class 1 National Insurance contributions. Within the £100,000 to £125,140 Personal Allowance taper, your marginal rate drops from 62% to a pure 60% (40% income tax plus 20% loss of allowance, with 0% NIC). State Pension age is currently 66, rising to 67 between 2026 and 2028 under the Pensions Act 2014.
⚖️ Statutory Authority & Primary Legislation
Legal BaselineGoverns the Personal Allowance taper. Every £2 of Adjusted Net Income above £100,000 withdraws £1 of allowance, creating the 60% effective income tax bracket.
Defines Adjusted Net Income (ANI), allowing grossed-up pension contributions (RAS) and Gift Aid donations to legally reduce taxable income back below £100,000.
Establishes the strict £100,000 single-earner income cap for 30 hours funded nursery places and Tax-Free Childcare accounts.
Exempts workers who have reached State Pension age from paying Class 1 Employee NIC, eliminating the 2% NI component in the marginal rate.