Back to Community
1

How to submit CT600 and Company Accounts without government gateway id?

Posted by Tanmoy Dutta 31 Jan 2026 at 09:56
Hi,

I am trying to submit my company's CT600 and Company Account but unable to do so as I don't have a government gateway id. Instead I have a Gov One login credentials.

Any help/guidance would be much appreciated!

Many Thanks
Tanmoy

2 Comments

T
Tim Fouracre Staff 31 Jan 2026 at 10:08
GOV.UK One Login is a newer government authentication system, but unfortunately it doesn't yet support Corporation Tax services. HMRC is planning to transition these services to GOV.UK One Login, but this isn't expected until late 2026 or 2027.

For now, to file your CT600 and Company Accounts, you'll need to create a separate Government Gateway account:

1. Visit

https://www.gov.uk/log-in-register-hmrc-online-services

2. Click "Create sign in details"

3. Select "Organisation" (not Individual)

4. Complete the setup with your company details

You'll need your Company UTR (10-digit Unique Taxpayer Reference) and company registration number (15924442) to enrol for Corporation Tax.

After creating your Government Gateway account, you can connect it to TinyTax to authorise CT600 submissions.

We have a detailed guide here:

https://tinytax.co.uk/guides/government-gateway-setup
T
Tanmoy Dutta 31 Jan 2026 at 10:17
Many thanks for the prompt response!