Buy-to-Let Mortgages: What Landlords Need to Know

Buy-to-let mortgages are a specialist area of the mortgage market with their own rules, criteria, and considerations. Whether you're purchasing your first investment property or expanding a portfolio, understanding how buy-to-let lending works is essential.

How Buy-to-Let Mortgages Differ from Residential Mortgages

Unlike residential mortgages, buy-to-let lending is primarily assessed on the rental income the property is expected to generate rather than solely on the borrower's personal income. Lenders typically require the expected monthly rent to cover a percentage of the mortgage repayment — usually between 125% and 145% — to ensure sufficient rental coverage.

Deposit Requirements

Buy-to-let mortgages generally require a larger deposit than residential mortgages. Most lenders will want a minimum of 25% of the property's value, though some specialist products are available with a lower deposit. A larger deposit usually means access to better interest rates.

Personal vs Limited Company Buy-to-Let

Many landlords now consider purchasing investment properties through a limited company (often called a Special Purpose Vehicle or SPV) rather than in their personal name. This can offer tax efficiencies, particularly for higher rate taxpayers. However, limited company mortgages can carry higher interest rates, and the right approach depends on individual circumstances. Independent tax advice should be sought alongside mortgage advice.

Portfolio Landlords

Landlords with four or more mortgaged buy-to-let properties are classified as portfolio landlords by most lenders. This triggers a more detailed underwriting process, with lenders reviewing the performance of the entire portfolio rather than just the individual property. Working with a broker experienced in portfolio lending can be particularly valuable.

Buy-to-let mortgages are not regulated by the Financial Conduct Authority unless the property is, or is intended to be, occupied by the borrower or their immediate family. Your property may be repossessed if you do not keep up repayments on your mortgage.