A buy-to-let mortgage is a loan for a property you intend to rent out rather than live in. It works differently from a residential mortgage, and the gap catches out plenty of first-time landlords who assume the two are much the same. They are not.
How lenders judge the deal
With a residential mortgage, the lender looks mainly at your income. With buy-to-let, they look chiefly at the rent the property can command. Most expect the rent to cover the mortgage payment comfortably, often by a margin of a quarter or more, to leave room for void periods and repairs. A weak rental yield can sink an application even from a wealthy borrower.
Bigger deposits, interest-only loans
Buy-to-let usually demands a larger deposit, frequently twenty-five percent of the value or more. Many landlords choose interest-only loans, paying just the interest each month and keeping the monthly cost low, then repaying the capital when they eventually sell. It boosts cash flow but leaves you exposed if prices fall.
- Higher deposit typically a quarter of the purchase price
- Rental stress test rent must clear the payment with margin
- Interest-only option lower monthly cost, capital due later
The costs that erode returns
Tax treatment has tightened in recent years, and landlords can no longer deduct all their mortgage interest from rental income before tax. Add the stamp duty surcharge on additional homes, letting fees, insurance and maintenance, and the headline yield shrinks. Run the figures on the full picture, not just rent minus mortgage.
Is it worth it?
Buy-to-let can still build wealth over the long run, particularly if the property rises in value while tenants cover the loan. But it is a business, not a windfall. Treat it with the seriousness of one, plan for empty months, and keep a cash reserve, and the numbers stand a far better chance of working.