There is no single buy-to-let mortgage rate to look up. The rate a landlord is quoted is the output of a handful of drivers working together: how much of the purchase price you are borrowing, how long you fix for, whether you borrow in your own name or through a limited company or SPV, what kind of property you are buying, and the arrangement fee bolted onto the product. Understand the drivers and a rate stops being a mystery. You can see why one deal is cheaper than another, and you can work out which lever to pull to improve your own.
This page explains each driver as a range rather than a live number, because specific buy-to-let rates move with swap rates and the Bank of England Bank Rate and date within days. It works through the fee-versus-rate trade-off that costs landlords real money, shows how the rate you are offered feeds back into how much you can borrow, and summarises how the tax treatment of interest changes what a rate actually costs a personal landlord. For the pay-rate and criteria detail specific to company borrowing, see the dedicated buy-to-let limited company mortgage rates guide; this page is the general picture across personal and company borrowing.
What actually sets a buy-to-let mortgage rate
Six factors do most of the work. Learn to read them and you can predict roughly where a deal will price before a broker quotes it.
- Loan-to-value (LTV) band. The biggest lever. Lenders price in tiers, commonly 60%, 65%, 70% and 75%, and each lower band earns a better rate because the lender's exposure is smaller if values fall. Rates rise sharply above 75% and availability thins above 80%.
- Fixed period. A 2-year fix and a 5-year fix are priced from different points on the swap curve, so neither is automatically cheaper. The market at the time decides.
- Borrower type. Borrowing through a limited company or SPV usually prices a little above the equivalent personal product, though the gap has narrowed as more lenders entered the market.
- Property type. Standard single-family lets get the broadest, keenest pricing. HMOs and holiday lets are specialist products and sit higher.
- Borrower profile. Experience, personal income where it is used to top up affordability, credit history and portfolio size all shift the rate and, more importantly, the lender pool.
- The arrangement fee. A low headline rate is frequently bought with a high percentage fee. Rate and fee move together, which is why comparing headline rates alone is a mistake.
Sitting behind all six is the wider rate environment. When the Bank of England Bank Rate and swap rates move, the whole range shifts up or down together, so a rate that looked keen six months ago may look ordinary today. This is precisely why a live rate table on a guide page is a trap: it is stale within a week. The durable knowledge is the drivers, not the number.
Personal name versus limited company or SPV rates
The most common rate question landlords ask is whether a limited company costs more to borrow through than personal ownership. As a rule, yes, but by a modest margin. Company and SPV lending tends to price a little above the equivalent personal buy-to-let product, reflecting the lender's view that corporate borrowing and repossession recovery are marginally more complex. The premium has compressed as mainstream and challenger lenders built SPV ranges, and for many landlords it is now measured in a fraction of a percentage point rather than a wide gulf.
Crucially, the rate premium is only one side of the ledger. For a higher-rate individual landlord, mortgage interest is no longer a deduction; it earns a basic-rate tax credit only, under the Section 24 finance-cost restriction. A limited company, by contrast, deducts finance costs in full against profit. So a company can pay a slightly higher rate and still be cheaper after tax on a geared property. That is a tax decision, not a rate decision, and it is the single biggest reason SPV buy-to-let demand exists. We do not re-argue it here. Work the numbers on the limited company versus personal ownership tax comparison and read how the interest restriction bites in the Section 24 complete guide, then bring the after-tax view back to the rate comparison.
The fee-versus-rate trade-off, and the number most landlords get wrong
Two products can advertise very different headline rates and end up costing almost the same, because one carries a chunky arrangement fee and the other does not. The landlord who chases the lowest rate without adding the fee back in overpays surprisingly often. Here is the mechanic on a worked example. The numbers are round and illustrative; rates change constantly, so verify the current market before you plan around them.
Take a £150,000 interest-only buy-to-let loan and two competing 2-year fixes:
| Product | Pay rate | Arrangement fee | Interest over 2 years | Total cost over the fix |
|---|---|---|---|---|
| A · low rate, fee | 4.5% | £999 | £13,500 | £14,499 |
| B · higher rate, no fee | 5.2% | £0 | £15,600 | £15,600 |
On this loan, Product A (the low rate with the £999 fee) wins by roughly £1,100 over the two years, even though its fee makes it look more expensive at first glance. The reason is loan size. The fee is a fixed cash amount, but the rate saving scales with the balance. At 0.7 percentage points cheaper on £150,000, Product A saves about £2,100 of interest over two years, comfortably more than its £999 fee.
Now shrink the loan. On a £50,000 loan the same 0.7-point rate saving is worth only about £700 over two years, which is less than the £999 fee, so the fee-free Product B wins. The crossover, where the interest saving exactly equals the fee, sits at roughly £71,000 on these figures. Below that, avoid the fee; above it, pay the fee to buy down the rate. This is why the honest answer to "high fee or low fee?" is always "how big is the loan?". Convert every competing offer into one total-cost figure over the fixed period (interest plus arrangement fee plus valuation and legal costs) before you choose. Our buy-to-let mortgage calculator will do the interest side for you.
Why HMO and holiday-let rates sit higher
If you are pricing a house in multiple occupation or a holiday let, expect the rate to sit above a standard single-family let. Both are specialist products served by fewer lenders, and fewer lenders means less competition on price plus more caution baked into the rate.
HMO lending prices for the extra moving parts: mandatory or additional licensing conditions, Article 4 and planning constraints, higher management intensity, and a valuation that on larger HMOs may be done on investment or commercial value rather than bricks-and-mortar. The room-count yield that makes an HMO attractive is real, but the lender charges for the added complexity. The mechanics of HMO lending, and which lenders value on which basis, are covered in the HMO mortgages guide.
Holiday-let lending prices for income that varies by season and for the lender's caution around short-term and Airbnb-style letting. Affordability is assessed on a blended low, mid and high-season figure rather than peak-week takings, which protects you from over-borrowing but also means the lender is lending against a conservative income. The holiday-let mortgages guide walks through the seasonal income basis. Note too that the furnished holiday letting tax regime was abolished from 6 April 2025, so the old tax perks that once justified paying a premium for a holiday let no longer apply; that is a tax change, not a rate change, and it does not affect the loan itself.
In both cases the higher rent these properties generate often more than covers the rate premium. The point is simply to expect the premium and to model the property on its own realistic income, not on a standard buy-to-let rate you saw elsewhere.
How the stress test turns a rate into a borrowing limit
Here is the part landlords most often miss: the rate does not only decide what you pay, it helps decide how much you can borrow. Lenders size the loan using an interest coverage ratio (ICR) against a stress rate set out under the Prudential Regulation Authority's underwriting standards for buy-to-let (SS13/16). The rental income must cover the interest at a stressed rate, not the pay rate, by a set margin. The typical ICR is 125% for a basic-rate individual or a limited-company borrower and 145% for a higher or additional-rate individual, reflecting the Section 24 restriction.
The stress rate is usually around 5.5%, or the product rate plus two percentage points, whichever is higher, for 2-year and variable products. But lenders commonly apply a lower stress rate, often nearer 5% or even the pay rate, to 5-year-plus fixes and to pound-for-pound remortgages that raise no extra borrowing. Because a lower stress rate means the same rent supports a larger loan, a 5-year fix at a slightly higher pay rate can unlock more borrowing than a cheaper 2-year deal. On £1,000 a month of rent stressed at 125% ICR, a 5.5% stress rate supports roughly £174,000 of borrowing, while a 5% stress rate supports roughly £192,000, about £18,000 more on the same rent. If your purchase is constrained by rent rather than deposit, the stress rate matters more than the headline rate. Model your own case with the buy-to-let rental stress test calculator before you fix on a product.
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Fixed, variable and tracker: choosing a rate type
Buy-to-let rates come as fixes and as variables. A fixed rate locks the pay rate for a set term, most often 2 or 5 years, and gives certainty for cash-flow planning, which is why the majority of landlords fix to protect rental margin. Variable products include trackers, which move with the Bank of England Bank Rate by a set margin, and discounted or lender variable rates. At outset a variable is often cheaper than a fix, but it exposes your margin to rate rises, and through the stress test a variable is assessed at the higher stress rate.
The choice between a 2-year and a 5-year fix comes down to two things: your view on where rates go next, and how much you need to borrow. A 5-year fix buys certainty and, as above, often a lower stress rate and higher borrowing, at the cost of a longer early-repayment-charge window. A 2-year fix keeps you flexible to remortgage or restructure sooner, which suits a landlord planning to refinance, incorporate or sell within a couple of years, but leaves you re-pricing into an unknown market. Match the fix length to how long you expect to hold the property and to your financing plan for it.
The tax overlay: what the rate really costs you
A headline rate does not equal the real cost of your borrowing, because tax sits on top of it, and it sits differently depending on how you own. For a limited company, the position is simple: finance costs are deductible in full against profit, so the rate you pay is close to the rate you feel. For an individual landlord it is not, because of the Section 24 finance-cost restriction.
Under Section 24, an individual no longer deducts mortgage interest from rental profit. Instead you receive a basic-rate (20%) tax credit on the interest, set out in HMRC's Property Income Manual (PIM2054). For a basic-rate taxpayer this roughly matches old-style relief. For a higher or additional-rate individual it does not: relief is capped at 20% while the income is taxed at 40% or 45%, so the effective cost of the interest is higher than the pay rate suggests, and the marginal tax position can even push a landlord into a higher band. That is the whole reason the after-tax cost of a slightly higher company rate can beat a lower personal rate on a geared property. For the working, see the guide to mortgage interest deductibility for landlords in 2026 and the Section 24 complete guide. The rate comparison is only complete once the tax overlay is on it.
Consumer buy-to-let: a different, regulated market
One important boundary. Everything above is about business-purpose buy-to-let, where you are buying or refinancing an investment property let to an arm's-length tenant. A consumer buy-to-let, where the borrower or a person related to the borrower occupies or will occupy the property, is a regulated mortgage contract under the regulatory perimeter (see the FCA's PERG 4.10A on the business-versus-consumer distinction). It is priced and conducted under a different, regulated framework, with its own affordability and conduct rules.
That regulated market is not what this page covers, and it is not something we introduce. If your situation is a family member living in the property, an accidental let of a former home, or any case where an occupier is connected to you, treat it as a regulated contract and speak to an FCA-authorised mortgage adviser. Our introductions are for business-purpose landlord finance only, made as a simple introduction rather than advice, and we do not arrange, negotiate or recommend any specific product or lender.
Getting an accurate read on today's rate
Because pricing moves weekly with swap rates and the Bank Rate, the only reliable read on the rate you would actually get is a live one, based on your LTV, property type, borrower structure and rent. Lender websites and comparison sites give a rough band; a specialist broker with live decision-in-principle data gives the real figure, plus the criteria that decide whether a given lender will accept your case at all. Sector-level trend context is published by UK Finance, and the rules that shape lender pricing and affordability sit in the PRA's SS13/16 and the FCA perimeter above.
On our side, the useful work happens before the rate: getting the ownership structure right so the rate you eventually pay costs you as little as possible after tax. Any introduction we make to a business-finance broker is a bare introduction for a business purpose, made under the financial-promotion rules in FSMA 2000 section 21, not advice on a specific mortgage. If you want the general picture of how buy-to-let mortgages work end to end, start with the buy-to-let mortgages guide, and to see which lenders serve which cases, the buy-to-let mortgage lenders guide.