Self Assessment Penalties at a Glance

Here is a quick reference for Self Assessment penalties.

Late Filing

| Delay | Penalty | |-------|---------| | 1 day | £100 | | 3 months | £10/day (max £900) | | 6 months | Greater of £300 or 5% of tax due | | 12 months | Greater of £300 or 5% of tax due |

Late Payment

| Delay | Penalty | |-------|---------| | 30 days | 5% of unpaid tax | | 6 months | Additional 5% | | 12 months | Additional 5% |

Plus interest from the due date at the Bank of England base rate + 2.5%.

Inaccuracies

| Type | Penalty range | |------|-------------| | Careless | 0–30% of extra tax | | Deliberate | 20–70% of extra tax | | Deliberate and concealed | 30–100% of extra tax |

How to Avoid Them

File early. Pay on time. Keep accurate records. Use Accounted to stay on top of your obligations throughout the year.

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