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HMRC have told me I owe tax for 2024/2025 but they've based their calculation on the wrong allowance

disgruntled1234 · 2025-07-16 10:08:03

Good morning all, I'm looking for some advice on a message I've received from HMRC this morning claiming I owe £121.80 for tax year 2024/25. Their calculation shows that I had a personal tax allowance of £12,570, but in fact my tax code for last tax year (and the tax year before) was 1317L so I argued to the lady I spoke…