Postcode or area Example: M14, SW11, LS6, B1, or full postcode. Property purchase price Use purchase price or current property value. £ Monthly rent Expected or actual rent before costs. £ Purchase costs SDLT, legal fees, broker fees, surveys, and acquisition costs. £ Refurbishment budget Initial works needed before letting. £ Annual running costs Repairs, compliance, insurance, accountancy, and other non-finance costs. £ Annual service charge / ground rent Use 0 for freehold houses with no service charge. £ Management fee Percentage of annual rent paid to agent. % Expected void days per year Days with no rent between tenancies. days Monthly mortgage payment Optional. Used for cash-flow after finance, not net yield. £ Local benchmark gross yield Optional comparison target for this postcode or area. % Include purchase/refurb costs in yield base? Yes gives an all-in capital basis. Yes — all-in cost basis No — property price only