Buy-to-let mortgages for contractors

Buy-to-let is often easier for contractors than a residential mortgage, because the loan is assessed mainly on the rent the property earns rather than on your personal income. The main hurdle is the interest coverage stress test — the rent must exceed the mortgage interest by a set margin at a stressed rate. Most lenders also want a minimum personal income, which is where reading your contract correctly still matters.

Why buy-to-let is often easier for contractors

Answer first: because a buy-to-let mortgage is assessed mainly on the rent the property will earn, not on your personal income. The day-rate problem that makes residential applications frustrating — lenders shrinking your income to the profit on a tax return — matters far less here, because the property largely carries the case.

That flips the usual dynamic. A contractor who struggles to get a high-street residential lender to read their income properly can often find buy-to-let comparatively straightforward, because the central question becomes “does the rent cover the mortgage?” rather than “how do we classify this person’s earnings?” Our buy-to-let page covers the product in full.

The interest coverage stress test — the real hurdle

The main test is the interest coverage ratio (ICR). The lender takes the expected rent and checks it exceeds the mortgage interest by a set margin — and it does this at a stressed interest rate, higher than the rate you’re actually paying, to be sure the deal still works if rates rise.

Two things follow from this. First, the rent is the number that determines how much you can borrow — so a property’s rental value matters more than its purchase price. Second, if the rent doesn’t clear the bar, the lender simply lends less, and you make up the difference with a bigger deposit. This is why an otherwise attractive property can fail on the numbers: it isn’t about you at all. The mechanics are explained in the BTL stress test.

Do you still need personal income?

Usually yes — most buy-to-let lenders require a minimum personal income, separate from the rent. It’s typically a threshold to clear rather than a figure they lend a multiple of, so it doesn’t drive your borrowing the way it would on a residential mortgage. But it does mean your income still has to be evidenced and read correctly.

For a contractor, that brings contract-based underwriting back into play — not to set the loan size, but to demonstrate you clear the income threshold. A lender that annualises your gross day rate will see you comfortably above it, where one working from minimised profit might not.

How much deposit do you need?

More than for a residential purchase — commonly around 25% of the property value, though this varies by lender and product. There’s a practical reason beyond risk appetite: a larger deposit means a smaller loan, and a smaller loan is easier to cover with the rent under the stress test. Deposit and ICR interact directly.

So if a property’s rent won’t support the borrowing you wanted, the lever available to you is usually more deposit rather than a different argument about your income. That’s a very different problem from the residential one, and it’s a much more predictable one to solve.

Personal name or limited company?

Many landlords now buy through a limited company (an SPV) rather than in their own name, and there’s a whole product market for it — see limited company / SPV buy-to-let. The structures are taxed differently, and which is better depends on your income, your plans, and how many properties you intend to hold.

This is genuinely a tax decision as much as a mortgage decision, so take it with an accountant rather than choosing on mortgage rates alone. What a broker can tell you is what each structure means for the rates and products available to you — the two halves of the decision need to be made together, not in isolation.

If you already own a home and want to let it out

That’s a different route with a different name: let-to-buy, where you keep and let out your current home while buying a new one to live in. It involves two linked mortgages — a buy-to-let on the property you’re leaving and a residential on the one you’re moving to — and remortgaging the first can often release the deposit for the second.

It’s a common move for contractors relocating for a contract who don’t want to sell, and it’s worth knowing it exists before assuming you have to choose between moving and keeping the property.

The bottom line

Buy-to-let is frequently the easier mortgage for a contractor, because the rent does most of the work in the affordability test rather than your day rate. Focus on the interest coverage stress test — it, not your income, is what caps your borrowing — budget for a larger deposit, and take the personal-versus-company decision with an accountant. To model a purchase and find the lenders that suit your income and structure, speak to an adviser.

Most buy-to-let mortgages are not regulated by the Financial Conduct Authority. The value of property and the income from it can fall as well as rise.