If you are receiving the error message ""There is an entry in box [PRO37], box [PRO4] must be absent. Please amend the incorrect entry." 


You may update the Total rent and other income from the property under box 20 and you may please tick box 4 to claim rent-a-room relief. If the total income is less than the threshold you may tick Box 4 and not necessary to update the rest of the boxes. If the total income is more than the threshold you may do either of  

• pay tax on the excess – without taking off any expenses – put your total income in box 20 and the exempt amount of £7,500 (or £3,750) in box 37 – you cannot claim the property income allowance on Rent a Room income 

• work out your profit from letting in the usual way – the amount in box 20 minus any allowable expenses in boxes 24 to 29 – do not put anything in box 37. 


Please refer to the attached HMRC guidance notes for more information.


URL: https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/1144423/SA105_Notes_2023.pdf    



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