HMRC have announced that from 1 November 2017 they will no longer be accepting forms CT600 where the attached accounts or tax computations are not in iXBRL format.

The use of the iXBRL format has been mandatory since 2011, so it is surprising that HMRC are still receiving a significant number of returns in the wrong format.

If the return is filed with attachments in the wrong format, the taxpayer will be asked to refile the CT600 and if this is not done by the deadline penalties will apply.

Other attachments (e.g. “white space” notes) should still be filed in pdf format.

Penalties: corporation tax

Penalties:late filing

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