CT600 Not Showing on HMRC Website | TinyTax Support

CT600 Not Showing on HMRC Website

Filed your CT600 through TinyTax but can't see it on HMRC's website? Don't worry — this is almost always a timing issue, not a problem with your filing.

Why Your CT600 Isn't Showing Yet

HMRC's Corporation Tax Online service (known as CATO) can take 3–5 working days to display new submissions. This delay is completely normal and applies to all software-filed returns, not just TinyTax.

Your filing was successful if:

  • TinyTax showed Accepted by HMRC after submission
  • You received a confirmation email with an HMRC document reference number
  • Your TinyTax dashboard shows a green tick for the CT600
ℹ The confirmation email from TinyTax with your HMRC document reference is proof that your return was accepted. You don't need to see it on HMRC's website to confirm it went through.

Where to Check on HMRC's Website

Make sure you're looking in the right place:

  1. Log in to your HMRC Business Tax Account (not your personal Self Assessment account)
  2. Go to Services > Corporation Tax
  3. Select View your returns
⚠ A common mistake is checking your personal HMRC account instead of your business account. CT600 returns only appear under the business/company login.

What If It's Been More Than 5 Working Days?

If your submission still isn't visible after 5 working days:

  1. Check your TinyTax dashboard — confirm the status shows as accepted
  2. Check your email — look for the HMRC acceptance confirmation with your document reference
  3. Call HMRC — Corporation Tax helpline: 0300 200 3410 (Monday–Friday, 8am–6pm). Have your company UTR ready

Common Questions

I can see it on TinyTax but not on HMRC — is there a problem?

No. If TinyTax shows it as accepted, HMRC has received and processed your return. The delay in their online view is a known HMRC system lag.

Will I be penalised for a late return if HMRC hasn't shown it yet?

No. The submission date recorded by HMRC is when they received it (shown in your confirmation email), not when it appears in their online service.

I filed accounts to Companies House too — where do I check those?

Companies House submissions appear on the public filing history within 24–48 hours:

`https://find-and-update.company-information.service.gov.uk/company/YOUR-COMPANY-NUMBER/filing-history`

⚠ Companies House WebFiling only shows submissions made through their own system. Filings submitted via third-party software like TinyTax appear on the public filing history page above, not in WebFiling.

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