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We introduced paid subscriptions in November 2025, and you've enjoyed free access since then. From now on, you'll need a subscription to file new returns.
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**Confirmation Statement (CS01) or Annual Accounts — Companies House authentication code**
This is a 6-character alphanumeric code that Companies House posted to your company's registered office address when the company was first registered. You enter it in TinyTax when submitting accounts or a confirmation statement.
If you don't have it:
1. Go to gov.uk/file-your-company-annual-accounts
2. Click "Request an authentication code"
3. Enter your company number and confirm your registered office address
4. A new code arrives by post within 5 working days
**CT600 to HMRC — Government Gateway User ID**
If you're filing your Corporation Tax return, the code you need is your 12-digit Government Gateway User ID plus your password. Log in at gov.uk/log-in-register-hmrc-online-services to find it.
For more detail on both codes, see:
- Companies House auth code: https://tinytax.co.uk/support/companies-house-auth-codes
- Government Gateway setup: https://tinytax.co.uk/support/government-gateway-setup
Let me know if you're stuck on a particular step and I'll help from there.