“Acceptance and rejection messages when you file online After you file your Employer Annual Return online, you'll get an acceptance or rejection message through the software or service you use. If you've provided HMRC with an email address, you'll also get an email message. These messages are usually issued within a minute of filing, but it can take longer if your return covers a large number of employees. If your return is successful, you'll get the following messages: • Software - '9004: the EOY Return has been processed and passed full validation' • Email - 'The submission for [your PAYE reference] was successfully received on [date]. If this was a test transmission, remember you still need to send your actual Employer Annual Return using the live transmission in order for it to be processed' If your return is rejected, you'll get the following message instead: • Software - your message will highlight the area(s) of your return that have led to its rejection. • Email - 'The submission for reference [your PAYE reference] was received on [date]. Unfortunately it could not be accepted as it failed data checks. To correct this, please use the help provided within the software you used to complete your form and send it again'”