HMRC taxes your rental profit, not your rent. That means every allowable expense you claim comes straight off your tax bill - a £1,000 expense saves a basic-rate taxpayer £200, and a higher-rate taxpayer £400. Yet we regularly see landlords doing one of two things: under-claiming and paying more tax than they need to, or over-claiming and risking an HMRC challenge. This guide sets out exactly what you can and can't claim, where the tricky lines fall, and what records HMRC exp