Specialist calculators and decoders to help you understand and optimise your UK tax.
Check if you and your spouse are eligible for Marriage Allowance and calculate your £252/year saving.
Enter your HMRC tax code and see exactly what it means — your tax-free allowance, region, and whether it looks correct.
Calculate your NI contributions for 2025/26 — employee, self-employed Class 2 & 4, and employer NI with band breakdowns.
See how much tax you'll pay on dividends. Your salary determines which band your dividends fall into — basic, higher or additional.
Calculate CGT on shares, crypto and property. See your £3,000 annual exemption and basic/higher rate split.
Calculate repayments for Plan 1, 2, 4, 5 and Postgraduate loans. See thresholds, monthly deductions and payoff estimates.
Model the true cost of pension contributions via salary sacrifice, net pay or relief at source — including NI savings and employer match.