Buy-to-let is having one of its most consequential years. The Renters Rights Act brings the biggest change to tenancy law in a generation on 1 May 2026. The SDLT surcharge on additional properties now sits at 5%. EPC requirements are tightening. And yet — for landlords who navigate these changes well — the improving rate environment is creating genuine opportunities.
How are buy-to-let mortgages assessed in 2026?
Buy-to-let mortgages are primarily assessed on the rental income the property generates, not your personal income. Lenders apply a rental coverage ratio: the annual rent must exceed the annual mortgage payment at a stressed interest rate by a defined margin.
Current stress rate requirements (March 2026):
- Five-year fix or longer: stressed at 4.5-5.5%, ICR of 125-145%
- Two-year fix: stressed at 6.5-8.15%, ICR of 125-145%
- Tracker or variable: pay rate + 2% (minimum 5.5%), ICR of 125-145%
Higher and additional-rate taxpayers owning in personal name typically face a 145% ICR requirement. Limited company borrowers and basic-rate taxpayers typically face 125%. The practical implication: a five-year fix allows landlords to borrow 25-35% more for the same rental income than a two-year fix — because the lower stress rate significantly improves the coverage calculation.
The Renters Rights Act — 1 May 2026
This is the most significant change to UK private rental law in decades. From 1 May 2026:
- Section 21 no-fault evictions are abolished. Landlords can no longer ask tenants to leave without a legal reason. Possession requires a Section 8 notice citing a specific valid ground.
- Fixed-term ASTs end. All new tenancies become Assured Periodic Tenancies — rolling until the tenant leaves or the landlord proves a valid Section 8 ground.
- Rent increases are limited to once per year with a minimum two months notice.
- Advance rent is capped at one month.
- If you need to sell: four months Section 8 notice required, with no notice allowed in the first 12 months of a tenancy.
For landlords, this means longer and less predictable possession timelines if a tenancy goes wrong. Lenders are factoring this into risk assessments. If you are planning to expand your portfolio, beginning the process now gives you cleaner options under the transitional regime.
What deposit do you need for a buy-to-let?
The minimum deposit for a buy-to-let mortgage is typically 25%, though some lenders consider 20% for strong borrowers and low-risk properties. Best rates are available at 40% LTV or below.
The BTL SDLT surcharge increased from 3% to 5% in October 2024 and applies to all additional residential property purchases. On a £300,000 purchase, the 5% surcharge adds £15,000 to upfront costs compared to a primary residence. Factor this into your initial yield and return calculations.
Limited company vs personal name — the 2026 picture
Since Section 24 removed mortgage interest relief for individual landlords, the tax case for holding properties in a limited company SPV has strengthened. Inside a company, mortgage interest is fully deductible against rental income before corporation tax (25%). In personal name, higher-rate taxpayers receive only a 20% tax credit against gross interest.
The premium on limited company BTL mortgages (typically 0.2-0.4% above personal name) has narrowed as more lenders compete in this market. Combined with the tax difference, limited company ownership is increasingly the right structure for higher-rate taxpayer landlords building or growing a portfolio.
Always take both mortgage and tax advice before deciding — the two disciplines interact. Find out more about buy-to-let mortgages here.
EPC requirements — plan now
The government has legislated minimum EPC Band C requirements for rental properties in England:
- New tenancies from 2028: EPC Band C minimum
- All existing tenancies from 2030: EPC Band C minimum
- Maximum landlord spend before exemption: £10,000 per property
Critically, the EPC methodology is being overhauled in 2026 to weight actual fabric efficiency over fuel type — meaning some properties may gain or lose a band even without physical changes. F and G-rated properties are already difficult to mortgage with some lenders. Build your upgrade plan now — EPC works can take months to commission and complete, and contractors in high-demand areas are already booking several months ahead.
Portfolio landlords
If you own four or more mortgaged buy-to-let properties, you are a portfolio landlord under PRA rules. Lenders must assess your entire portfolio when considering any new application. The combination of rising property values and falling interest rates means many portfolios that were tightly stressed in 2023 now have meaningful headroom. A portfolio review may reveal more borrowing capacity than you expect. Speak to us free of charge.
Most Buy to Let mortgages are not regulated by the Financial Conduct Authority. YOUR HOME MAY BE REPOSSESSED IF YOU DO NOT KEEP UP REPAYMENTS ON YOUR MORTGAGE.
BTL Mortgages Are Not Regulated by the FCA
This is a crucial point: most buy-to-let mortgages fall outside Financial Conduct Authority regulation. This means they are more flexible than residential mortgages in some ways — and riskier in others. Lenders set their own terms, and there is less legal protection for borrowers.
Income Requirements and Affordability
Lenders assess BTL affordability differently from residential mortgages. They typically require the rental income to cover 125–145% of the mortgage payment. This is called the “interest cover ratio.”
For example, if your mortgage costs £1,000/month and the lender requires 125% cover, your rental income must be at least £1,250/month. In 2026, lenders are stricter about affordability than they were pre-2022. Many require 145% cover.
The Renters Rights Act 2026
As of 1 May 2026, the Renters Rights Act fundamentally changes England’s private rental market. Section 21 evictions are abolished — landlords can no longer evict tenants simply because their fixed term ends. You can only evict for non-payment, anti-social behaviour, breach of terms, or needing the property for yourself (with 6 months’ notice).
This means longer, more secure tenancies but less flexibility for landlords. If you are buying a BTL property expecting quick turnaround between tenants, the landscape has changed.
Tax on BTL Income
Rental income is taxable. BTL expenses you can deduct include mortgage interest, letting agent fees, repairs, insurance, council tax, utilities, and depreciation. Many landlords underestimate their tax liability. A £20,000 annual rental profit might be subject to 20%–40% tax.
Building a Successful Portfolio
Most successful BTL investors do not buy just one property. Building a portfolio allows you to spread risk, achieve economies of scale, and refinance equity into new purchases. However, after 4–5 BTL properties, some lenders become reluctant to lend further.
Why Professional Guidance Matters
BTL investing is complex, with tax, regulatory, and affordability considerations far beyond a standard residential mortgage. Vsure advisers understand BTL lending criteria and can help you structure your purchase for long-term success. Contact us for a free consultation on your BTL plans.
Important: This article is for information purposes only and does not constitute regulated financial advice. YOUR HOME MAY BE REPOSSESSED IF YOU DO NOT KEEP UP REPAYMENTS ON YOUR MORTGAGE. VSure Financial Ltd is an appointed representative of The Openwork Partnership, a trading style of Openwork Limited which is authorised and regulated by the Financial Conduct Authority. Approved by The Openwork Partnership on 01/02/2025. Speak to an adviser for advice tailored to your circumstances.
