Buy-to-let mortgage rates price above equivalent residential deals, and they move with swap markets rather than the base rate alone. The headline rate is only half the picture, because the rental coverage test decides what a lender will actually advance. Mortgage One is a whole of market mortgage adviser arranging buy-to-let mortgages for landlords borrowing personally and through limited companies.

To see how current buy-to-let pricing translates into a workable loan on a specific property, call 01202 155992 or contact Mortgage One.

Where buy-to-let fixed rates sit against the base rate

Buy-to-let fixed rates track sterling swap rates, not the Bank of England base rate directly, which is why they move in weeks when base rate has not changed at all. The chart below plots average two-year and five-year fixed pricing at 75% loan-to-value against the base rate itself.

The chart below shows average buy-to-let fixed rates at 75% loan-to-value against the Bank of England base rate, with the market-implied path ahead.

Updated 29 July 2026

The spread between base rate and buy-to-let fixed pricing is the number that matters. When that gap widens, lenders are pricing in funding cost or risk rather than reacting to the Bank of England. When it narrows, competition is doing the work. Watching the gap rather than the headline tells a landlord whether a repricing wave is genuine market movement or a lender chasing volume in a particular loan-to-value band.

Buy-to-let averages also lag residential averages on the way down. Lenders reprice their residential range first, then follow on buy-to-let once the swap move has held. That lag is why a landlord who reads a residential rate cut as an immediate buy-to-let cut is usually a few weeks early. Where base rate itself is heading next is set out in our interest rate projection.

Why buy-to-let rates price above residential mortgages

Buy-to-let interest rates carry a margin over comparable residential pricing because the loan is not owner-occupied, the income is rental rather than salaried, and most lending is unregulated. Void periods, tenant risk and a slower route to recovering security all feed into the premium lenders charge on landlord borrowing.

The premium is not fixed. It compresses when lenders are competing for landlord business and widens when they are managing volumes or capital. Product fees do a lot of the work here, because a buy-to-let lender can advertise a keen headline rate and recover the margin through a percentage-based fee rather than a flat one.

That is the practical difference between buy-to-let and residential pricing. On a residential deal the flat fee is broadly neutral across loan sizes. On buy-to-let, a fee charged as a percentage of the loan scales with the borrowing, so the same product can be sharp on a small loan and expensive on a large one. The criteria sitting behind that pricing are covered in our buy-to-let mortgage guide.

The four inputs behind any buy-to-let rate you are quoted

Four inputs set typical buy-to-let mortgage rates: the loan-to-value band, the product fee structure, the fixed term chosen, and the ownership route. Loan-to-value bands usually step at 60%, 65%, 70% and 75%, and crossing a band by a few thousand pounds of borrowing can move the rate more than shopping between lenders.

●      Loan-to-value band. Pricing improves in steps, not smoothly. A deposit that lands just inside the next band down is worth more than the same money spread thinly across a higher band.

●      Product fee structure. A percentage fee, a flat fee and a fee-free option on the same product line produce three different total costs over the fixed term.

●      Fixed term. Two-year and five-year products price from different swap curves, so the cheaper term changes as the curve shifts.

●      Ownership route. Personal-name and limited company products sit in different ranges, on different fee scales.

Property type sits alongside those four inputs and can move the range entirely. HMO mortgages and holiday let lending are priced from a narrower lender panel, and the loan-to-value ceilings are usually lower than on a standard single let.

Average buy-to-let mortgage rate figures published in the trade press blend all of this together, which is why the number you read rarely matches the number you are offered. The tiles beneath the chart give the market averages. Your own quote is decided by which side of each of those inputs your case falls on.

How does the rental stress test cap what you can borrow?

The rental stress test, or interest coverage ratio, checks that rent covers the mortgage interest at a stressed rate well above the pay rate. Most lenders require 125% cover for basic-rate taxpayers and 145% for higher-rate taxpayers, tested at around 5.5%, and that calculation usually caps the loan before the headline rate does.

This is the part landlords most often get wrong when comparing rates. A sharper rate on a two-year fix can produce a smaller loan than a slightly higher five-year fix, because many lenders apply a reduced stress rate, sometimes close to the pay rate itself, on five-year products. The cheaper rate and the bigger loan are frequently on different products.

Top-slicing changes the answer again. Where a lender allows surplus personal income to bridge a shortfall between the rent and the coverage requirement, a case that fails on rent alone can still complete. Not every lender offers it, and those that do apply their own limits. The buy-to-let rental stress test calculator lets you test the rent required at a given stressed rate before you commit to a product.

If your rental figure sits close to a lender’s coverage requirement and you want to know which products still support the loan you need, call 01202 155992 or contact Mortgage One.

Should landlords take a two-year or five-year fixed rate?

Compare buy-to-let mortgage rates across both terms on total cost and loan size, not headline pricing. A five-year fix often unlocks a lower stress rate and therefore a larger loan, while a two-year fix keeps you free to reprice sooner. Early repayment charges usually run heavier in the early years of a five-year deal.

The decision is usually driven by the plan for the property rather than by the rate curve. A landlord intending to sell inside three years, move the property into a company structure, or carry out works that will lift the valuation has a reason to keep the exit open. A landlord holding for income over a decade is buying payment certainty and a wider loan, and the early repayment charge matters less. Timing a switch around a deal-end date is covered in our guide to buy-to-let remortgaging in 2026.

Where the two-year and five-year averages sit close together, the five-year usually wins on the stress test alone. Where the two-year is materially cheaper, the question becomes whether the extra borrowing capacity is needed at all. If the loan required sits comfortably inside the coverage test either way, the shorter term buys optionality at no cost to loan size. Our comparison of current two-year and five-year fixed deals covers the same trade-off on the residential side.

Interest-only pricing and the true cost of a buy-to-let

Most buy-to-let lending is arranged interest-only, so the rate applies to the full balance for the whole term with no capital repaid. That keeps the monthly cost down and helps the coverage calculation, but the balance is unchanged at the end of the term and needs a credible repayment route.

Buy-to-let interest only mortgage rates are not usually priced differently from capital repayment on the same product. The difference is the payment, not the pricing. Where interest-only changes the rate conversation is through loan size, because the coverage test runs off the interest cost alone, so an interest-only case can clear a stress test that the same loan on repayment would fail.

The true cost of the borrowing is the rate, plus the fee, plus what happens at the end. A landlord on interest-only for twenty years pays the rate on the whole balance the entire time and still owes it in full. That is a deliberate choice on a portfolio built for yield and refinancing, and a poor one where there is no exit plan beyond hoping values rise.

Portfolio and limited company buy-to-let rate differences

Buy-to-let portfolio mortgage rates and limited company pricing usually sit slightly above mainstream personal-name products, though the gap has narrowed as more lenders entered the specialist market. Once you hold four or more mortgaged rentals, lenders assess the whole book, and the constraint shifts from the rate on offer to which lenders will look at the case.

Limited company products carry their own fee scales and often a slightly wider margin, but the coverage test is frequently more workable because mortgage interest is a deductible business cost rather than a restricted personal one. The comparison that matters is not the two rates side by side, it is the loan each route supports once tax treatment and coverage are applied. The limited company buy-to-let guide sets out the structure and criteria differences, and the tax position should be confirmed with a qualified accountant.

Portfolio landlords face a further layer. Lenders test aggregate coverage across every mortgaged property, not just the one being financed, so a weaker asset elsewhere in the book can restrict the rate and loan available on a strong one. The portfolio landlord guide covers how those assessments work and what documentation lenders expect.

For a free initial consultation on which lender’s pricing and coverage test fits your property and ownership structure, call 01202 155992 or contact Mortgage One.

Back to Buy-to-Let Mortgages

The information provided in this article is for general guidance only and does not constitute personal or regulated financial advice. If you’d like to understand what these moves could mean for you, speak to Mortgage One. We can explain your options and timings based on your specific circumstances.

FAQs

1. What is the current interest rate for a buy-to-let mortgage?

There is no single figure. The tiles beneath the chart on this page show the current average two-year and five-year fixed buy-to-let rates at 75% loan-to-value alongside the Bank of England base rate. An individual quote is set by the loan-to-value band, the fee structure, the fixed term and whether the property is held personally or through a company.

2. Are buy-to-let mortgage rates coming down?

Buy-to-let pricing follows sterling swap rates, so it falls when markets price in lower rates ahead and rises when they do not. The chart shows the recent direction and the market-implied path, but no direction can be promised. The practical response is to reserve a rate when one works and use a lender’s switch-down option if pricing improves before completion.

3. Why are buy-to-let rates higher than residential rates?

Lenders price landlord borrowing as a higher-risk proposition. The property is not owner-occupied, the income depends on tenants rather than salary, void periods interrupt payment, and most of the lending sits outside the regulated residential regime. That risk margin is reflected in both the rate and the fee structure.

4. Does a larger deposit reduce the buy-to-let rate?

It usually does, but in steps rather than smoothly. Pricing improves as you cross into a lower loan-to-value band, commonly at 75%, 70%, 65% and 60%. A deposit that takes you just inside the next band down is worth considerably more than the same money added inside a band you have already cleared.

5. Is the product fee more important than the headline rate?

On buy-to-let it often is. Many landlord products carry a fee charged as a percentage of the loan rather than a flat amount, so the fee scales with the borrowing. On a larger loan, a percentage fee can outweigh a keener rate over a two-year term. The comparison has to be run on total cost across the fixed period, on your actual loan size.

6. Do limited company buy-to-let rates differ from personal-name rates?

Limited company products have historically priced slightly above personal-name equivalents, though the gap has narrowed as more lenders entered the market. The more significant difference is usually the coverage test, which can be more workable through a company. Tax treatment depends on your circumstances, so speak to a qualified accountant before choosing a structure.

7. How far ahead can I reserve a buy-to-let rate?

Most lenders allow a new rate to be reserved up to around six months before the current deal ends. Many also allow a switch down if pricing falls before completion, which means reserving early rarely carries a cost. Leaving it late risks the deal lapsing onto the lender’s standard variable rate.

8. Does a broker make a difference on buy-to-let rates?

It changes which products are on the table. Buy-to-let lending is spread across specialist lenders and building societies that do not deal direct, and the loan a case supports varies more by coverage test than by headline rate. As a whole of market mortgage broker, Mortgage One can test the same case across different stress rates, fee structures and ownership routes before an application is submitted.