🏠 UK Buy to Let Mortgage Guide
Invest in property.
Get the right mortgage.
Buy to Let mortgages are specifically designed for properties you intend to let to tenants. They work very differently from residential mortgages — understanding the key differences is essential.
25%
typical minimum deposit required
ICR
rental coverage ratio — the key affordability test
Not FCA
most BTL mortgages are not FCA regulated
⚠ Most Buy-to-Let Mortgages are not regulated by the Financial Conduct Authority. Always take independent tax advice from a qualified accountant before investing.
Key Differences
BTL mortgages differ
from residential ones.
You cannot use a standard residential mortgage for a property you plan to let. BTL mortgages have their own criteria, structure and lender requirements.
Residential Mortgage
For properties you live in yourself
Affordability based on your personal income
Regulated by the FCA under MCOB rules
Deposits from 5% possible
Capital and interest repayment most common
Buy to Let Mortgage
For properties let to tenants
Affordability driven by rental income, not salary
Most BTL mortgages are not FCA regulated
Minimum 25% deposit typically required
Interest-only repayment is common
Affordability
Rental stress testing:
the key number.
Lenders don't primarily look at your income — they assess whether the expected rental income covers the mortgage interest at a stressed rate. This is called the Interest Coverage Ratio (ICR).
Example property value
£250,000
Annual interest at stress rate (e.g. 5.5%)
£10,312
Required rental coverage (125% ICR)
£12,890 / yr = £1,074 / mo
Rental income must be at least
£1,074 per month
ICR requirements and stress rates vary by lender. Higher-rate taxpayers may face a 145% ICR instead of 125%. This is an illustrative example only — not personalised advice.
Ownership Structure
Personal BTL
vs Ltd Company BTL.
Whether to hold a BTL property in your own name or through a limited company is a significant decision with tax and mortgage implications. Always take independent tax advice from a qualified accountant.
Personal Name
Simpler administration — no company to run
Rental income taxed at personal income tax rate
Mortgage interest relief now limited (Finance Act 2015, Section 24)
Wider lender choice and often lower rates
May suit basic-rate taxpayers and smaller portfolios
Limited Company (SPV)
Rental income taxed at corporation tax rate
Mortgage interest fully deductible against profit
Profits can be retained and reinvested tax-efficiently
Growing lender choice; rates can be slightly higher
Often suits higher-rate taxpayers and larger portfolios
This comparison is informational only. Always take independent tax advice from a qualified accountant before making decisions about property ownership structure.
Lender Criteria
What lenders look for
in a BTL application.
Beyond rental coverage, lenders apply a range of eligibility criteria. Understanding these helps you prepare a strong application.
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Minimum Income
Many lenders require a minimum personal income — typically £25,000 per year — even though affordability is primarily rental-driven.
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Own Your Home
Most BTL lenders require you to already own a residential property, either outright or with a mortgage. First-time buyer BTL is possible but reduces lender choice.
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Credit History
A clean credit history is important. Defaults, CCJs or significant missed payments will affect your options. Check your credit file before applying.
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Portfolio Landlord Rules
If you own 4 or more mortgaged BTL properties, you are a "portfolio landlord". Lenders must assess your whole portfolio, not just the new property. More documentation required.
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Property Type
Standard houses and flats are most straightforward. HMOs, MUFBs and student lets require specialist lenders with different criteria and rental calculations.
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Age Limits
Most lenders cap the maximum age at end of term — typically 70–85 years. Check this when considering your mortgage term length.
Understanding the Costs
The full cost picture
of Buy to Let.
BTL has higher upfront and ongoing costs than residential property. Planning for these is essential to assessing viability.
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Deposit: 25%+ Minimum
Most BTL lenders require at least 25% deposit. Better rates are typically available at 40% or more. LTV is one of the biggest factors in BTL pricing.
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Stamp Duty: 5% Surcharge
Additional property purchases attract a 5% Stamp Duty Land Tax surcharge in England and Northern Ireland (on top of standard rates), as of October 2024. Budget for this.
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Maintenance & Voids
Ongoing maintenance, letting agent fees, insurance and void periods (no tenant) must all be factored into your yield calculation. A healthy cash reserve is essential.
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Tax on Rental Income
Rental income is subject to Income Tax (personal BTL) or Corporation Tax (Ltd BTL). Mortgage interest relief is restricted for personal landlords. Take independent tax advice.
The Process
Your BTL mortgage
journey.
From finding the property to receiving rental income — understanding the full process helps you plan effectively.
Step 1
Viability & Advice
We assess your rental income potential, deposit position and the most suitable ownership structure for your circumstances.
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Step 2
Lender Match
We identify lenders from our comprehensive panel whose rental stress tests and criteria best fit your specific property and situation.
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Step 3
Agreement in Principle
Provides a basis for making an offer. Note: an AIP is not a mortgage offer and is subject to full application and assessment.
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Step 4
Full Application
Valuation instructed. Full application submitted with all rental income evidence and supporting documents.
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Step 5
Offer & Completion
Mortgage offer received. Exchange and completion. Tenancy arranged and rental income begins.
An Agreement in Principle shows how much you may be able to borrow based on the information you provide. It is not a mortgage offer and is subject to full application and credit assessment.
The MakeMyMortgage Difference
BTL is complex.
A specialist broker helps.
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BTL Lender Panel
We offer advice based on a comprehensive panel of lenders representative of the whole of the market — including specialist BTL lenders, portfolio landlord-friendly lenders and HMO specialists.
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Rental Stress Test Expertise
Every lender calculates rental coverage differently. We know which lenders' stress tests are most favourable for your rental income and property type.
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Proactive Document Checks
We thoroughly review all your documents before they reach the lender — catching potential issues early and giving your application the best possible start.
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Regulated, Expert Advice
Providing regulated advice and working for you. Expert mortgage advice on BTL structures, lender selection and portfolio strategy.
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Portfolio Support
Whether you're buying your first BTL or managing an existing portfolio, we understand the additional complexity portfolio landlords face and navigate it for you.
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Broker-Only Rates Available
Some mortgage rates are only available through brokers and not accessible by going direct to lenders.
Get Started Today
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Regulatory Information
Your Rights & Our Status
⚠️ Important Risk Warnings
Your home may be repossessed if you do not keep up repayments on your mortgage. Most Buy-to-Let Mortgages are not regulated by the Financial Conduct Authority.
🏛️ Our Regulatory Status
MakeMyMortgage is an Appointed Representative of PRIMIS Mortgage Network, a trading name of Personal Touch Financial Services Ltd. Personal Touch Financial Services Ltd is authorised and regulated by the Financial Conduct Authority.
💷 Fee Information
We may charge a broker fee for our mortgage advice service. Our fee will be discussed and agreed with you before any work begins. Our typical fee is £299 but this can vary depending on the complexity of your mortgage needs. Our fee will be discussed and agreed with you before any work begins.
📞 Contact Us
MakeMyMortgage · makemymortgage.co.uk · This guide is for information purposes only and does not constitute personal mortgage advice or tax advice. Always take independent tax advice from a qualified accountant. Information was correct at time of publication.
We offer mortgage advice based on a comprehensive panel of lenders representative of the whole of the market. We do not offer advice across all available products from all lenders. Personalised mortgage advice is available on request. The guidance contained within this document is subject to the UK regulatory regime and is therefore primarily targeted at consumers based in the UK.