Home / Glossary / Portfolio landlord
What is Portfolio landlord?
Last verified 23 October 2026
A portfolio landlord is a landlord who owns several rental properties rather than one. Mortgage lenders use the term when assessing buy-to-let borrowers with a number of mortgaged properties, and each lender sets its own definition in its criteria.
Why it matters to landlords
For tax, the number of properties does not change the basic structure. HMRC treats all of a person's UK rental income as one UK property business, so receipts and expenses from every property are added together and a loss on one property can be set against profits on another. Overseas property is a separate business. For jointly owned property, your share counts.
Portfolio size matters for Making Tax Digital for Income Tax. Qualifying income is gross property and self-employment income before expenses, so several modest rents can take a landlord over the threshold: more than £50,000 from 6 April 2026, more than £30,000 from 6 April 2027 and more than £20,000 from 6 April 2028, each based on an earlier tax year's return. A bigger portfolio also means more certificates, licences and renewal dates to keep track of.
Example
A landlord owns four flats, each let at £8,000 a year, so gross rents total £32,000. The profit after expenses is much lower, but MTD looks at the £32,000. If the 2025 to 2026 return shows that figure, the landlord must use MTD-compatible software from 6 April 2027.
MTD for landlords: what you must do →