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HMRC internal manual

Self Assessment Manual

Returns: filing paper returns: 31 October deadline: receipt of returns by security guards

Should any office be open to the public (including goods entrance), please note that non-HMRC security guards are not permitted to take receipt of any SA returns. Security guards will have been instructed to tell those people attempting to leave paper returns to leave them in the letterbox (if one is provided), file online or post the return.