As it says on the tin, buy-to-let refers to buying a home with the purpose of letting it out to tenants. If you need to borrow to fund the purchase, you’ll have to take a specialist buy-to-let mortgage which requires a bigger deposit. And, as well as affordability, the lender will look at the rental income of the property versus the interest payable on the mortgage. There are several costs to think about as a buy-to-let landlord beyond the property price, ranging from repairs and maintenance to tax on rental income.