Experimental. this calculator is still under development. Figures, tax estimates, and comparisons may be incomplete or change without notice. Do not rely on them for investment decisions.
UK gilts are loans to the government. Conventional gilts pay a fixed coupon, usually twice a year, and repay £100 of face value on the redemption date. Choose a gilt and a quantity, then calculate to see the cashflow schedule and how income tax bands can affect coupon income and annualised returns.
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The gilt list is sourced from the Debt Management Office Gilts in Issue report (D1A) . Market clean prices are refreshed from a public gilt price table and stored for the calculator. Redeemed gilts are removed after their redemption date.
Coupon interest counts as savings income in the UK tax year it is paid. Personal Savings Allowance is currently £1,000 for basic-rate taxpayers, £500 for higher-rate taxpayers, and £0 for additional-rate taxpayers, applied separately in each tax year. Amounts above that allowance are taxed at the band rate shown. The gain or loss versus the £100 redemption price is shown separately and treated as free of Capital Gains Tax for gilts. Summary annualised return rates show the range across those tax bands.
If you enter an optional bank interest rate, the calculator compounds the same purchase cash at that AER until the gilt redemption date. All bank growth is treated as taxable savings interest, while only gilt coupons are taxed as interest — the capital move to £100 is kept outside income tax in the comparison.