P60 Tax Code Errors Explained (2025 Guide & Fast Fixes)
If your P60 shows a tax code you weren’t expecting, you’re not alone. In 2024–2025, HMRC reported that 1 in 4 PAYE taxpayers ended up on an incorrect tax code at least once during the tax year. A wrong tax code can lead to overpaid tax, underpaid tax, or an unexpected message from HMRC later.

