A couple going through mortgage paperwork at home

How do buy-to-let mortgages work?

A buy-to-let mortgage is secured on a property you let to tenants.

The lender looks at the expected rent against the mortgage payment as well as your own finances. As an individual landlord you get tax relief on the interest at 20%, and buying an additional home carries a higher rate of property tax.

The adviser for this subject: Mike Chan

Interest-only or repayment

Interest-only
The monthly payment covers the interest and the whole amount borrowed is owed at the end of the term. MoneyHelper notes that interest-only is still offered on buy-to-let. You need a way to repay the capital, such as selling the property.
Repayment
Each payment includes capital, so the monthly cost is higher than interest-only on the same loan, the balance falls, and the loan is cleared at the end of the term if every payment is made.

How lenders test the rent

Lenders compare the rent the property is expected to earn with the mortgage payment, calculated at a rate the lender sets for the test. Each lender uses its own figures, and some take your personal income into account as well.

The deposit, the property type and whether you already own let property also affect what a lender will offer.

Tax relief on mortgage interest

  1. 1

    No deduction for interest

    Since 6 April 2020 an individual landlord cannot deduct mortgage interest or other finance costs from residential rental income.

  2. 2

    A 20% tax reduction

    You get a reduction in your tax bill at the basic rate of 20%, worked out on the lowest of your finance costs, your property profits and your adjusted total income.

  3. 3

    What counts as a finance cost

    Mortgage interest, interest on loans to buy furnishings, and fees for taking out or repaying a mortgage. Capital repayments get no relief.

  4. 4

    Unused relief carries forward

    Where the reduction is limited by your property profits, the excess finance costs carry forward to later years.

A company that lets property pays corporation tax and deducts its interest under the loan relationship rules, so this restriction does not apply to it. When do I pay capital gains tax on property?

Property tax on an additional home

England and Northern Ireland
Stamp Duty Land Tax at 5% on top of the standard rates where the purchase means you own more than one residential property. On a £250,000 purchase that is £15,000, against £2,500 at the standard rates.
Scotland
Land and Buildings Transaction Tax plus the Additional Dwelling Supplement of 8% of the whole price, for purchases of £40,000 or more, since 5 December 2024.
Wales
Land Transaction Tax at the higher residential rates, from 5% on the first £180,000 up to 17% above £1.5m, since 11 December 2024.
Replacing your main home
Each nation has rules for buyers replacing their main residence, with a 36-month window in England, Northern Ireland and Scotland. Check them before you commit to the purchase.

An individual landlord cannot deduct mortgage interest from the rent. The relief is a tax reduction at the basic rate of 20%.

Related questions

Is a buy-to-let mortgage regulated by the FCA?

A buy-to-let mortgage taken out for business purposes is outside FCA mortgage regulation, and the FCA's guidance treats you as borrowing for business purposes if you already own let property. Some first-time landlords take out a consumer buy-to-let mortgage, which has its own separate set of rules.

Can I let my current home and buy another?

You need your lender's consent to let, or a buy-to-let mortgage on the home you are leaving. Buying the new home while keeping the old one can bring the higher rates of property tax.

Should I buy through a limited company?

A company deducts interest under corporation tax rules, and taking money out of it is taxed again as salary or dividends. Lenders treat company borrowing differently too. Take tax advice on your own figures before you decide.

Does capital gains tax apply when I sell?

Yes, on a property that was never your home. Capital gains tax sets out the rates and the annual exempt amount.

Do I pay income tax on the rent?

Yes, on your rental profit at your own rate of income tax, with the 20% reduction for finance costs set against the bill.

Where this fits

Bring the expected rent, the price and any other property you own, and we can look at lenders' criteria for your purchase.

Talk to an adviser

Your first call is with an Account Manager and is at no cost to you. Tell us what is on your mind: a pension you have lost track of, a fixed rate ending, a will you keep meaning to write.