Buy-to-Let Mortgages: A Guide for UK Landlords

A buy-to-let mortgage UK lenders offer is a specialist loan designed for purchasing property to rent out, rather than to live in. Unlike a standard mortgage, it’s assessed primarily on the property’s expected rental income rather than your personal salary, with most lenders requiring a deposit of at least 25% and rental income covering 125% to 145% of the mortgage interest at a stressed rate. FairBridge Finance helps landlords and property investors across the UK access buy-to-let mortgages through a whole-of-market lending panel, structuring the right deal around your portfolio and goals.

Key Takeaways

• What it is: A mortgage specifically for rental property, assessed on rental income potential rather than personal income alone.
• Deposit: Most lenders require at least 25% of the property’s value, though some products are available with lower deposits at higher rates.
• Rental coverage: Lenders typically want rental income to cover 125% to 145% of the mortgage interest, calculated at a stressed rate rather than your actual rate.
• Interest-only is common: Many landlords choose interest-only buy-to-let mortgages to maximise monthly cash flow, repaying the capital when the property is sold or refinanced.
• Personal name vs limited company: A growing number of landlords now buy through a limited company (SPV), which changed how mortgage interest is treated for tax purposes.
• Rates run higher than standard mortgages: Buy-to-let products carry a premium because lenders view rental property as higher risk than owner-occupied homes.
• Regulation matters: Most buy-to-let mortgages are not regulated by the Financial Conduct Authority (FCA), which is part of why working with a knowledgeable broker adds real value.

How Does a Buy-to-Let Mortgage Actually Work?

The core difference between a buy-to-let mortgage and any other home loan comes down to what the lender is actually assessing. With most mortgages, the lender wants to know: can you personally afford this from your income? With a buy-to-let mortgage, the question shifts to: will this property generate enough rental income to cover the borrowing?

This changes the entire application process. Rather than focusing heavily on payslips and personal outgoings, lenders will typically want to see:

• The property’s expected monthly rental income, usually confirmed by a letting agent or surveyor’s assessment
• A rental coverage ratio (ICR) showing the rent covers the mortgage interest by a defined margin, commonly 125% to 145%, calculated at a “stressed” interest rate higher than your actual rate, so the numbers still work if rates rise
• Your wider financial position, including whether you already hold other properties, and your experience as a landlord

Most buy-to-let mortgages are interest-only, meaning your monthly payment only covers the interest, with the capital balance repaid later, typically when the property is sold or the mortgage is refinanced. This keeps monthly costs lower and cash flow stronger, but it does mean a clear plan for repaying the capital eventually is essential.

How Much Deposit Do You Need?

Deposit requirements for buy-to-let mortgages are noticeably higher than for a standard residential purchase. Most lenders ask for at least 25% of the property’s value, and some products, particularly for non-standard properties or first-time landlords, may require even more. A smaller number of specialist products are available with deposits closer to 15% to 20%, though these typically come with higher rates to reflect the additional risk.

The size of your deposit doesn’t just affect whether you qualify, it directly affects your rate. Moving from a higher loan-to-value (LTV) band down to a lower one, for example from 75% LTV to 60% LTV, can meaningfully reduce your interest rate, which adds up to a significant saving over the life of the mortgage.

What Do Buy-to-Let Mortgage Rates Look Like Right Now?

Buy-to-let rates have settled into a more stable pattern after several volatile years, though they continue to sit above equivalent residential mortgage rates, reflecting the higher risk lenders attach to rental property. Fixed-rate products remain the most popular choice, with two-year fixes typically priced slightly below five-year deals, though the gap has narrowed. Tracker and variable-rate options are also available for landlords who prefer flexibility over rate certainty.

Several factors influence the rate you’ll be offered:

• Loan-to-value (LTV): A larger deposit generally unlocks better pricing
• Property type: Standard houses tend to attract the most competitive rates, while HMOs, flats above commercial premises, and non-standard construction usually carry a premium
• Portfolio size: Landlords with four or more mortgaged properties fall under different underwriting rules, sometimes referred to as portfolio landlord criteria
• Personal name vs limited company (SPV): Limited company buy-to-let mortgages are becoming increasingly common and typically carry a small rate premium compared to personal-name equivalents

Because pricing and criteria shift regularly across the market, this is exactly the kind of decision where a broker with whole-of-market access can save both time and money compared to approaching a single lender directly.

Buying in Your Own Name or Through a Limited Company?

This has become one of the most common questions landlords ask, and the right answer depends heavily on individual circumstances. Buying through a limited company, often referred to as an SPV (Special Purpose Vehicle), allows mortgage interest to be treated as a business expense, which can be more tax-efficient for higher-rate taxpayers since mortgage interest relief for individually owned rental property has been restricted to the basic rate.

That said, limited company ownership isn’t automatically the better choice for everyone. Corporation tax rates, the cost of extracting profits from the company, and the slightly higher mortgage rates typically attached to SPV products all need to be weighed against your personal tax position and how large your portfolio is likely to grow. This is a decision worth making alongside both a mortgage broker and an accountant, rather than in isolation.

What’s Changed for Landlords Recently

The buy-to-let landscape has shifted meaningfully in the past year, and it’s worth understanding the current picture before applying:

• The Renters’ Rights Act introduced significant changes for landlords in England, including the removal of Section 21 “no-fault” evictions and a move to periodic tenancies rather than fixed terms, alongside a limit of one rent increase per year to the market rate.
• EPC requirements are tightening. Landlords are increasingly factoring energy efficiency upgrades into their investment planning, since minimum EPC standards for rental property are becoming stricter over the coming years.
• Portfolio landlord rules continue to apply extra scrutiny for those with four or more mortgaged properties, affecting how affordability is assessed.

None of this makes buy-to-let unworkable, but it does mean the numbers need to be checked more carefully than they might have been a few years ago, and it’s part of why working with a broker who understands the current landscape matters more than ever.

Getting the Right Buy-to-Let Mortgage

A buy-to-let mortgage isn’t a one-size-fits-all product. The right structure for a first-time landlord buying a single property looks very different from the right structure for an experienced investor growing a four-property portfolio through a limited company. Rental coverage ratios, stress-testing rules, and lender appetite all vary considerably across the market, and a product that looks competitive on rate can still fall through on affordability if the numbers aren’t checked properly upfront.

FairBridge Finance works with landlords and property investors across the UK to find buy-to-let mortgages structured around their actual circumstances, whether that’s a first rental purchase, a portfolio remortgage, or a limited company acquisition. Drawing on a whole-of-market lending panel rather than a single bank’s product range, the team helps landlords navigate rental coverage requirements, ownership structure decisions, and current market conditions with clear, straightforward guidance from application through to completion.

Frequently Asked Questions

Q: How much deposit do I need for a buy-to-let mortgage?

Most buy-to-let mortgages require a 25% deposit. Some specialist lenders may accept deposits from 15%, but these products usually come with higher interest rates and stricter lending criteria.

Q: How is a buy-to-let mortgage assessed differently from a standard mortgage?

Buy-to-let mortgages are primarily assessed on the property’s expected rental income rather than the applicant’s salary. Lenders also use a rental coverage ratio (ICR) to check affordability.

Q: Are buy-to-let mortgages interest-only?

Yes, many buy-to-let mortgages are available on an interest-only basis. This reduces monthly payments, with the loan balance typically repaid when the property is sold or refinanced. Repayment mortgages are also available.

Q: Is it better to buy through a limited company or in my own name?

It depends on your tax situation and investment goals. Buying through a limited company can offer tax advantages for some landlords, while purchasing personally may suit others. A mortgage broker and accountant can help determine the best option.

Q: Can first-time landlords get a buy-to-let mortgage?

Yes, first-time landlords can get a buy-to-let mortgage. However, lenders often apply stricter affordability criteria, and some may not offer buy-to-let products to first-time buyers.

Q: What is a rental coverage ratio (ICR)?

A rental coverage ratio (ICR) measures whether the property’s rental income is enough to cover the mortgage interest. Most lenders require rental income to be 125% to 145% of the stressed interest payment.

Q: Is FairBridge Finance FCA authorised?

Yes. FairBridge Finance Ltd (FRN: 1051868) is an appointed representative of White Rose Finance Group Limited (FRN: 630772), which is authorised and regulated by the Financial Conduct Authority (FCA).

FairBridge Finance Ltd is a credit broker, not a lender. Your property may be at risk if you cannot keep up repayments. Most buy-to-let mortgages are not regulated by the Financial Conduct Authority.