Landlord Sums.comFree calculators for UK landlords
Free · No sign-up · Updated 1 October 2026

The sums every UK landlord needs

Stamp duty, tax, company ownership, short lets, rent increases and compliance. Plain answers with your own numbers, kept up to date with the rules.

Buy Before you buy

Rental YieldGross and net yield, and the return on the cash you put in.Stamp DutyStamp duty on a buy-to-let, second home or main home, with the 5% surcharge.Short LetsShort let against a normal tenancy, after fees, cleaning, bills and tax.HMORoom-by-room letting against a single let, after bills, licence and tax.

Tax Tax on your rentals

Section 24What your rental keeps after Section 24 and the April 2027 tax rise.Ltd CompanyPersonal ownership against a limited company, including the cost of moving.

Manage Running a let

BudgetWhat to set aside each month, and your break-even rent.Rent IncreaseThe earliest legal date for a rent rise under the Renters' Rights Act.ComplianceWhat you need before move-in, what renews, and what's changing.

Spreadsheet For your whole portfolio

Guides The rules, explained

GuideLandlord tax changes from April 2027Rental profit taxed at 22%, 42% and 47%, and what to do before April.GuideThe Renters' Rights Act: what landlords need to knowWhat changed on 1 May 2026, and the dates still to come.GuideHow to register on the landlord databaseWhen your region opens, the £65 fee, and what you'll need.