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File with Company House with mistakes

I filed with Company house but discovered a mistake afterwards (Used Free agent). Can i use Tinytax to file a correction and CT600?

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T
Tim Fouracre Staff 31 Jan 2026 at 16:00
Thanks for getting in touch.

Companies House Accounts: Unfortunately, amended accounts can only be filed by the original filing software. Since your accounts were filed through FreeAgent, any corrections would need to go through them. This is a Companies House restriction rather than a TinyTax limitation.

CT600 (Corporation Tax): Good news here - you can absolutely use TinyTax to file an amended CT600, even though your original was filed elsewhere. When you start a new filing for that period in TinyTax and try to submit, HMRC will flag that they already have a return. You can then proceed to file an amendment which will replace your original submission.

Here's our guide on the process:

https://tinytax.co.uk/support/filing-an-amended-ct600

The guide covers the different methods for filing an amendment and what to expect.