TL;DR
Buy to Let mortgage - key points
A Buy to Let mortgage is used to finance a property bought for rental. The bank assesses not only your financial situation, but also the investment potential, expected rent and whether the rent covers the mortgage payment with enough margin.
A deposit of at least 25% is commonly needed; some lenders consider 20%. The mortgage can often be arranged personally or through an LTD/SPV. The best option depends on your strategy, tax position, exit plan and property type.
Before applying, it is worth checking whether the expected rent passes the rental stress test, whether a personal or LTD/SPV purchase is more suitable and whether the property fits lender criteria. This helps avoid applying to a bank that was never likely to fit the investment. Allow for purchase costs and a reserve for periods without rent, when mortgage payments remain due.
What is a Buy to Let mortgage?
A Buy to Let mortgage in the UK is a mortgage for buying or refinancing a property that will be rented out. Unlike a standard residential mortgage, the lender assesses not only the applicant’s finances, but also the expected rent, rental cover, property type, deposit and investor experience.
This means that mortgage affordability alone is not always enough. The lender may check whether rent is sufficient at a specific stress rate, what deposit you have, whether you already own property, whether your credit history fits criteria and whether you are buying personally or through a special purpose company.
As a broker, we help compare available routes and choose the option that fits your goal: first investment property, portfolio growth, refinancing, LTD/SPV purchase or improving cash flow.
Investor profile
Who is a Buy to Let mortgage for?
First Time Landlord
For people buying their first rental property. Some lenders accept this profile, but may apply extra requirements.
Experienced Landlord
For applicants who already have landlord experience and want to buy another investment property.
Portfolio Landlord
For investors with several properties. The bank may assess the full portfolio, cash flow, commitments and ownership structure.
Ltd / SPV
For clients considering a purchase through a special purpose company. This can affect tax and lending criteria, so it should be discussed with a broker and accountant.
If you are buying your first property in the UK and comparing a home for yourself with a rental investment, the First-Time Buyer guide may also be useful.
Lender criteria
Common Buy to Let mortgage requirements
Criteria vary between banks, but several areas usually need to be checked at the same time. This is why lender selection matters before submitting an application.
Deposit
A deposit of at least 25% is commonly needed; some lenders consider 20%, subject to criteria. A higher deposit can increase product choice and improve terms.
Rental income
The lender usually compares expected rent with interest costs calculated at its chosen stress rate and requires a margin above those costs. The stress rate may differ from the mortgage’s actual interest rate.
Income and credit history
Some lenders require minimum personal income, and credit history still matters.
Investor experience
Some banks prefer clients who already own property or have landlord experience.
Interest only or capital repayment?
With an interest-only mortgage, monthly payments cover interest without reducing the amount borrowed. The capital must be repaid at the end of the mortgage term, so you need a realistic repayment plan; future refinancing is not guaranteed. Capital repayment pays off interest and capital, so payments are higher for the same loan amount, interest rate and term, but the debt reduces over time.
Read about mortgage interestWhat costs should I budget for beyond the deposit?
Allow for mortgage fees, legal work, valuation or survey costs and any purchase tax: Stamp Duty Land Tax (SDLT) in England and Northern Ireland, Land Transaction Tax (LTT) in Wales, or Land and Buildings Transaction Tax (LBTT) in Scotland. Check the buying costs relevant to your transaction.
Also budget for insurance, maintenance, repairs and a reserve for empty periods or unpaid rent. Mortgage payments remain due even when the property produces no rental income.
7 steps
What does the Buy to Let mortgage process look like?
- 1
Consultation and investment goal
We check whether you are buying your first rental property, expanding a portfolio or refinancing an existing BTL.
- 2
Deposit and rent analysis
We review deposit, expected rent, rental cover and basic affordability.
- 3
Agreement in Principle
If the case allows it, we obtain an Agreement in Principle and define a realistic purchase budget.
- 4
Property choice
You can search for a house or flat within the agreed budget and expected rental range.
- 5
BTL mortgage selection
We compare lenders, rates, fees, rental stress tests and conditions for a personal purchase or LTD/SPV.
- 6
Full application
We submit the application and coordinate documents, valuation and lender communication.
- 7
Offer and completion
After the Mortgage Offer, the solicitor completes the transaction and you can prepare the property for letting.
If you already own a rental property, a remortgage means replacing its mortgage with one from another lender. It may allow different terms or additional borrowing, subject to eligibility. Switching to another deal with your current lender is a product transfer, and its requirements may differ. For a remortgage, check rental cover, property value, the outstanding balance, fees and any early repayment charge.
Broker support
Do you need an adviser for Buy to Let?
You do not have to use an adviser, but with BTL it is often practical. The market is more specialised, and lenders can take different views on rent, property type, LTD/SPV purchases, first-time landlords and portfolio landlords.
Access to many lenders
We compare mortgage products across more than 100 lenders, subject to each lender’s eligibility criteria.
Investment strategy
We check whether a personal purchase, LTD/SPV, interest only or capital repayment route better fits your plan.
Lower application risk
BTL lenders assess rental income, the property and applicant eligibility. Accurate documents help them assess the application.
Support in English or Polish
We explain the process clearly and support your application. The lender makes the mortgage decision.
Buying personally or through an LTD/SPV?
A Buy to Let mortgage can often be arranged in your own name or through a limited company (Ltd). SPV stands for Special Purpose Vehicle: an entity established for a specific purpose, here property activities. A limited company can therefore be an SPV. The company structure and activities a lender accepts depend on its criteria. Buying through a company is not automatically the best option for everyone.
The difference can affect tax, company running costs, lender choice, interest rates, fees and how profits are taken. Before deciding, it is worth speaking to both a mortgage adviser and an accountant.
Our role is to show which mortgage options are realistically available in your situation and what terms banks may offer for a personal purchase or LTD/SPV.
FAQ
Frequently asked questions
How do banks calculate rental income for Buy to Let?
Rental cover, often expressed as an interest coverage ratio, compares expected rent with mortgage interest costs. In a rental stress test, the lender assesses those costs at a chosen test rate, which may differ from the mortgage’s actual interest rate. The required margin and calculation depend on the lender, product, tax position and purchase structure.
Can I remortgage a Buy to Let property?
Yes. A BTL remortgage replaces your mortgage with one from another lender and may allow different terms or additional borrowing, subject to eligibility. A new deal with your current lender is a product transfer, and its requirements may differ. For a remortgage, check rental cover, property value, the outstanding balance, fees and any early repayment charge.
How is Buy to Let different from a residential mortgage?
A residential mortgage is for a property you live in. Buy to Let is for a property rented to tenants. With BTL, the lender places more weight on rent, rental stress testing, property type and investor profile.
How much deposit do I need for Buy to Let?
A deposit of at least 25% is commonly needed. Some lenders consider 20%, subject to criteria. The exact amount depends on the lender, property type, expected rent, your situation and whether you buy personally or through an LTD/SPV.
Does a Buy to Let mortgage depend on my income?
Yes, but differently from a standard residential mortgage. The bank focuses heavily on rent and rental cover, but may also check personal income, commitments, credit history and investment experience.
Can I buy a rental property through a limited company?
Some lenders offer Buy to Let mortgages to limited companies, often an SPV set up for property activities. The lender will check the company structure and the people behind it, and may require personal guarantees. Compare mortgage costs and company running costs with a personal purchase, and discuss tax consequences with an accountant before choosing the ownership structure.
Interest only or capital repayment - which should I choose?
Interest-only payments cover interest without reducing the capital, which must be repaid at the end of the mortgage term. Capital repayment gradually reduces the debt. The choice depends on your budget, risk tolerance and a realistic repayment plan.
Can a First Time Buyer get a Buy to Let mortgage?
Some banks accept this, while others require you to already own a residential property. It is not one fixed rule across the market, so lender criteria should be checked before applying.