Corporation Tax
What happens after you submit a CT600
Acceptance receipts, audit entries, and how to prove the filing later.
On acceptance, Hydra stores the processing response and correlation ID on the immutable audit log for that client.
Download or screenshot the acceptance panel for your working papers. Tax due figures remain visible on the return record inside the client workspace.
If HMRC later voids a return because period dates clash with their records, amend the dates and file again as instructed in the rejection letter.