For landlords with one to a few properties
Landlords

For landlords letting one or more homes in the UK
Rental income and expenses
Log your rent and your letting costs for each property through the tax year. The workbook adds up each property, sorts your costs by category, keeps mortgage interest and other finance costs apart from your expenses, and sets your income against the £1,000 property allowance.
£9Excel (.xlsx) and Google Sheets

For landlords with one or more let properties
Property portfolio overview
See every property you let on one page: what it's worth, what you owe, your equity and loan to value, the rent, the monthly costs, the cash left over and the gross yield. A second sheet keeps each property's safety and renewal dates, works out when the gas check, the electrics and the EPC are next due, and turns a date amber when it's within 60 days.
£9Excel (.xlsx) and Google Sheets

For landlords keeping their own deposit and inspection records
Deposit and inspection log
Keep one row for each tenancy deposit: when you got it, which scheme protects it, when you gave your tenants the required information, and when and how much you gave back. The log works out the date it had to be protected by, the deposit cap for the rent, and flags anything that looks late or over the cap. A second sheet records each inspection: check-in, mid-tenancy and check-out.
FreeExcel (.xlsx) and Google Sheets