Capital Gains Tax rates and allowances
The annual exempt amount and the two rates, one row per tax year, with the source each figure was read from.
Two figures decide most of a Capital Gains Tax bill. The annual exempt amount is the gain you can make in a year before anything is due, and it comes off the total gain before the rate is applied. The rate then depends on your income: the part of a gain that still fits inside your basic rate band is charged at the lower rate and the rest at the higher one.
These are the figures the calculator on this site applies. It reads the same table this page prints, so a year on this page cannot quietly differ from the figure in a report.
The figures go on the capital gains summary pages of a Self Assessment return. The exempt amount is claimed once for the year and is not transferable, and an unused part of it cannot be carried forward.
Every year held
A year outside this table is not guessed at. The calculator refuses it, says so, and charges no exempt amount rather than borrowing one from another year.
The year the rates moved
The rates changed on the day of the Autumn Budget 2024. A disposal made on or before 29 October 2024 takes the old pair and one made on or after 30 October 2024 takes the new pair, so 2024/25 has two of everything and the date of each disposal decides which applies.
Every row here carries the source the figure was read from. A row that carries none is not printed, and a short line says which year was left out instead. That is deliberate. A rate with nothing behind it is the one most likely to be wrong and the hardest for a reader to check.