What will filing late actually cost?
Companies House penalties are automatic — no appeals for "I forgot". Enter your dates and see the damage, then never pay it.
Your dates
Companies House penalty
38 days late
£375
| Up to 1 month late | £150 |
| 1 to 3 months late | £375 |
| 3 to 6 months late | £750 |
| More than 6 months late | £1,500 |
And HMRC adds its own
A late CT600 has a separate, parallel penalty ladder — and after three late returns in a row the flat penalties rise to £500 each.
- 1 day late£100
- 3 months lateanother £100
- 6 months late10% of the unpaid tax, estimated
- 12 months lateanother 10%
The fix costs less than any band: a WrenTax dormant filing is £29, and the watch is free.
Check your real deadlinesCorporation tax calculator