How do I know HMRC have officially received my return?
On successful receipt of your tax return HMRC sends back a message which will appear on the confirmation screen:
This response contains an official reference called an IRmark. This is the official response that confirms receipt of your tax return and is proof of filing.
untied will send you an email with a PDF copy of your return which contains this response at the top. You can also download this using the download icon at the top of the screen, or via the web app.
You will also get an email directly from HMRC confirming receipt of your return and approximately 72 hours after submission your return will appear in your HMRC online account/government gateway showing the headline figures.