Can I carry back Gift Aid donations to the previous tax year?

Full answer

Gift Aid carry back is a little-known Self Assessment election that lets you treat a donation made in the current tax year as if it had been made in the previous tax year instead, for tax relief purposes. This is useful in two common situations: first, if you had significantly higher income (and therefore a bigger higher or additional rate tax saving available) in the previous tax year than you expect to have in the current one, carrying the donation back lets you claim relief against the year with the larger benefit. Second, if you want to claim tax relief sooner rather than waiting for next year's tax return, carrying back a donation made shortly after the tax year end (but before you file your return) into the just-finished tax year brings the tax saving forward. To use it, you must make the election on your Self Assessment tax return for the earlier year, and the donation must be made before you actually submit that return -- so if you are filing your 2025/26 return in, say, June 2026, a donation made in April or May 2026 (technically within the 2026/27 tax year) can still be carried back and treated as a 2025/26 donation, provided you had not yet filed. You must also have paid enough Income Tax or Capital Gains Tax in the year you are carrying back to (the earlier year) to cover the amount the charity reclaims through Gift Aid, since HMRC will otherwise ask you to make up the shortfall. Basic rate relief is claimed automatically by the charity regardless of which year you allocate the donation to; carry back specifically affects when you receive any additional higher or additional rate relief through your own tax return.

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