SAM121010 | Returns: individuals returns: acknowledging returns: individuals
From HM Revenue & Customs · Self Assessment Manual
Issue of Receipts
Receipts are not issued as a matter of course, except in the case of returns filed by Internet which automatically receive an electronic acknowledgement. If you receive a written request to acknowledge the receipt of a return, or the taxpayer, or agent, encloses a stamped, self addressed acknowledgement with the return, you should advise that it is not HMRC policy to issue receipts.
There are two main reasons why HMRC does not acknowledge returns
The acknowledgement of the physical receipt of the return is of very limited value if, in subsequently processing the return, you discover that it is unsatisfactory
The taxpayer is advised of the details arising from the return either in a Tax Calculation or a Statement of Account