Unable to Save: Session Data Missing — How to Fix | TinyTax Support

Unable to Save: Session Data Missing — How to Fix

What This Error Means

The message "Unable to save: session data missing" appears when TinyTax cannot find an active filing session linked to the current form. The filing session is a short-lived identifier that connects your form to the right company and period — without it, the draft saver cannot store your progress.

Common Causes

CauseWhy it happens
Navigated directly to the form URLTinyTax sets up the filing session when you start from the dashboard — skipping this step means no session is created
PHP session expired mid-formLeaving the form open for a long time (typically over an hour) can cause the server session to time out
Multiple tabsOpening the same filing in two browser tabs can cause session conflicts

How to Fix It

  1. Go to your Dashboard at https://tinytax.co.uk/dashboard
  2. Find your company and click File (or Continue Filing if the button shows)
  3. This restarts the filing flow and creates a fresh session
  4. Fill in your figures and save as normal
ℹ Your figures are not lost. If you had previously saved a draft, TinyTax will reload your saved data automatically when you return to the filing form from the dashboard.

If you had not yet saved any figures, you will need to re-enter them — but this is uncommon because the draft saver runs automatically as you type, as long as a valid session is present.

If the Problem Persists

If you return from the dashboard and still see the error:

  1. Log out of TinyTax and log back in
  2. Start the filing again from the dashboard
  3. Avoid opening the filing form in more than one tab at a time
If the error continues after that, please contact hello@tinytax.co.uk with your company name and the period you are trying to file for.

Common Questions

I filled in all my figures — will I lose them?

If the draft auto-saver ran at any point before the error appeared, your figures are saved and will reload when you return from the dashboard. If the session was never established (e.g., you navigated directly to the form URL from a bookmark), you may need to re-enter them.

Can I bookmark the form URL to return to it later?

The form URL works, but always start a new session via the dashboard to ensure everything is linked correctly. Bookmarking the form directly can bypass the session setup step.

Was this guide helpful?