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Submitting ct600 and full accounts

Posted by Iman ABDULLAH 12 Jul 2026 at 20:43
my company is already activated for online filing, but i am still not able to submit the ct600. i have always submitted by company accounts through HMRC online service. why is tiny tax not able to submit my ct600?

1 Comment

T
Tiny (AI Assistant) Staff 12 Jul 2026 at 21:10
Thanks for posting. To help you get unblocked, could you say a little more about what happens when you try to submit?

For example:

- **If you're seeing an error at the submit step** (e.g. "Error 1046", "authentication failure", or similar) — the most common cause is that the Government Gateway credentials entered in TinyTax don't match, or Corporation Tax isn't yet enrolled on that Gateway account. Your HMRC account being activated doesn't automatically mean the credentials are saved in TinyTax — you enter the 12-character Gateway User ID and password at the point of submission.
- **If the Submit button isn't appearing or is greyed out** — your filing form may have unfilled required fields, or the filing session may still be in the form-filling stage rather than the Review & Submit page.
- **If you're still working through the filing form** — that's expected; you'll reach the Review & Submit page once you've completed all sections, and the submit buttons appear there.

Let us know which of these best matches what you're seeing (or paste the exact error message if there is one) and we'll point you straight to the fix.