L · Glossary
Late filing penalty
£100 instant fine + further penalties if your tax return is late.
The late filing penalty for Self Assessment is £100 even if you owe £0. After 3 months: £10/day for 90 days. After 6 months: greater of £300 or 5% of tax. After 12 months: another £300 or 5%. Total can exceed £1,600 for a return more than a year late.
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