Buy-to-let mortgages kept simple.

A buy-to-let mortgage is borrowing secured on a property you intend to rent out, rather than live in yourself. You can use one to buy a rental property or replace a mortgage on a property you already let. Lenders look closely at the expected rent as well as the property and your circumstances.

Yes, some lenders accept first-time landlords. You do not always need to own another rental, but some lenders expect you to own your home already. Your deposit, income, credit history and the property all affect the options. Tell your adviser if this would also be your first property purchase.

A deposit of around 25% is common, but it is not a rule for every lender. Some mortgages accept less, while other properties or applications need more. The lender’s rental assessment can also limit the loan amount. A bigger deposit may give you more choice, but leave room in your budget for purchase costs and running the property.

You must get your mortgage lender’s permission before renting out a mortgaged home. Depending on your plans, it may offer consent to let, or you may need a buy-to-let mortgage. If you are also buying a new home, a let-to-buy arrangement can involve two mortgages. Your adviser can explain how the borrowing and completion dates fit together.

The lender checks whether the expected rent covers the mortgage interest by a set margin. This is called the interest coverage ratio, or ICR. It may use a higher test interest rate than the rate you would initially pay. The calculation varies with the lender, mortgage and ownership structure. Personal income and other commitments may also be assessed.

With interest-only, your scheduled payments cover interest but do not reduce the loan. You need an acceptable plan to repay the capital at the end. With repayment, you pay interest and part of the loan each month. For the same rate and term, repayment payments are higher because they also reduce the balance. Your adviser will explain both options against your plans.

Yes, some lenders offer mortgages to limited companies. Many expect a company set up specifically to hold and let property, often called a special purpose vehicle (SPV). Directors may have to give personal guarantees, so a company mortgage does not necessarily remove personal liability. Your adviser can explain the mortgage terms. Get independent tax and legal advice before choosing the ownership structure.

Lenders can assess the mortgages, rent and borrowing across your portfolio, not just the property you are buying or refinancing. Shared houses classed as houses in multiple occupation (HMOs), and blocks containing several flats, can need specialist products. Tell your adviser about the layout, tenants and any licence requirements early so they can check suitable lenders.

Some lenders allow extra borrowing against a rental property, for example towards another purchase or improvements. It depends on the property value, existing debt, rental assessment and the purpose of the money. Compare any early repayment charges and fees before switching. Borrowing more increases your debt and the interest you pay; equity is not money you can automatically withdraw.

Mortgage costs can include a product fee, broker fee, valuation and legal work, plus early repayment charges if you are leaving an existing deal. Buying a property can also involve property transaction tax, which varies across the UK. Allow separately for insurance, repairs, letting costs and periods without rent. Your adviser will explain mortgage costs; a solicitor or tax adviser can cover the wider tax position.

The mortgage terms decide what you can overpay without a charge. Selling or clearing the balance during an early repayment charge period can trigger a charge, even if the sale is unexpected. When that period ends, an exit or administration fee may still apply. If you plan to sell, refinance or pay down the loan, discuss that before choosing a product.

Most buy-to-let mortgages taken out as a business investment are not regulated by the Financial Conduct Authority. Consumer buy-to-let mortgages, such as some cases involving an inherited property or a former home, have a separate regulatory framework. The rules depend on the circumstances, not just the product name. Your adviser will explain which applies to your mortgage.