L · Glossary
Late payment penalty
5% surcharge after 30 days late, plus daily interest at 7.75% (2025).
The late payment penalty for Self Assessment is 5% of unpaid tax 30 days late, another 5% at 6 months, another 5% at 12 months. Plus interest at the official rate (7.75% from August 2024). Time-to-Pay arrangements can avoid penalties if agreed before the deadline.
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