Thanks for being an early TinyTax user!
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.
Your past submissions remain accessible.
Solo: £40/year (1 company)
Portfolio: £50/year (unlimited companies)
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- Accounts submission → Uses your company number + Companies House auth code (no UTR needed)
- CT600 submission → You'll enter your UTR in the submission popup when you click Submit
If you're filing your CT600, just click Submit and you'll see a field for your UTR along with your Government Gateway credentials.
To enter your UTR:
1. Complete the submission form with your company's financial information
2. Click "Preview & Submit" at the bottom
3. On the preview page, click the green "Submit Corporation Tax" button
4. A popup will appear asking for your UTR and Government Gateway credentials
You haven't reached the preview stage yet. Once you complete the form and click Preview, you'll see the submission buttons.