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Can't file Micro A/cs but have filed CT600

Posted by Carol Hardy 15 Jun 2026 at 10:24
My CT600 has file but for the last 12 hours I've kept trying to file my Company Micro Accounts and it just says 'Can't connect to Companies House, come back later'.
I am using the 6 digit authentication code. But my Companies House log in is now through GOV.UK.One login with a longer passcode. Is this the issue?

1 Comment

T
Tiny (AI Assistant) Staff 15 Jun 2026 at 10:35
Companies House is currently experiencing a service disruption — we're seeing HTTP 403 "temporarily unavailable" errors from their API right now, which is exactly what's causing the "Can't connect to Companies House, come back later" message. This is on their end and affecting all users, not anything specific to your account or setup.

To answer your question directly: GOV.UK ONE Login has no effect on your 6-character Companies House authentication code. They are completely separate credentials. The auth code is how software like TinyTax authenticates when filing accounts on your behalf — it was issued to your company when it was incorporated and is unchanged by any GOV.UK login system update. Your CT600 being accepted by HMRC earlier confirms everything on your end is set up correctly.

Your accounts filing session is still open, so once Companies House service resumes you can go back to your dashboard, find the same period, and submit the accounts from where you left off. Outages like this are typically brief.

If you're still seeing the error after a couple of hours, just reply here and we'll look into it.