Commercial Buy-to-Let Mortgages: Rates, Deposits & Lender Guide
Commercial buy-to-let mortgages allow investors to purchase commercial property specifically for rental income. While the concept is similar to residential buy-to-let, the lending criteria, rates, tax treatment, and risk profile are fundamentally different. Having advised hundreds of commercial property investors during my banking career and since founding Commercial Mortgages Broker, I know that understanding these differences is the key to making sound investment decisions. This guide covers everything you need to know about financing commercial investment property.
What Is a Commercial Buy-to-Let Mortgage?
A commercial buy-to-let mortgage is a loan secured against a commercial property that is let to a tenant or tenants for rental income. The property is not occupied by the borrower's own business — it is held purely as an investment. The lender assesses the rental income from the property as the primary source of mortgage repayment.
Commercial buy-to-let mortgages are used to finance:
- Office buildings let to business tenants
- Retail units let to shops, restaurants, or service businesses
- Industrial units and warehouses let to manufacturers, logistics companies, or tradespeople
- Mixed-use properties with both commercial and residential tenants
- Specialist properties such as care homes, nurseries, or medical practices let to operators
- Multi-let estates with multiple units and tenants
The key distinction from an [owner-occupier commercial mortgage](/knowledge-hub/complete-guide-commercial-mortgages-uk) is that the borrower does not trade from the property. The lender's focus is on the security of the rental income stream rather than the borrower's business performance.
How Commercial BTL Differs from Residential BTL
Investors familiar with residential buy-to-let often assume commercial BTL works the same way. There are important differences that affect your strategy and returns.
Lease Structure
Residential tenancies operate on Assured Shorthold Tenancies (ASTs), typically 6 to 12 months. Commercial leases are fundamentally different:
- Term: Commercial leases typically run for 3 to 25 years, with 5 to 10 years being common
- Rent reviews: Built-in rent review mechanisms, usually every 3 or 5 years, with upward-only review clauses in many cases
- Repairing obligations: Tenants often take on full repairing and insuring (FRI) responsibility, meaning the landlord has minimal maintenance costs
- Break clauses: Structured breaks give either party the option to end the lease early at specific points
- Security of tenure: The Landlord and Tenant Act 1954 gives commercial tenants rights to renew their lease at expiry, providing income continuity
This structure means commercial property can offer much more predictable, long-term income than residential, but also less flexibility to change tenants or adjust rents.
Yield Profile
Commercial property typically offers higher gross yields than residential:
- Prime commercial: 5% to 7% gross yield
- Secondary commercial: 7% to 12% gross yield
- Compare with residential BTL: Typically 4% to 6% gross yield in most areas
However, higher yields reflect higher risk. Commercial property is more susceptible to economic cycles, tenant failure, and longer void periods. A vacant commercial unit can take months or years to re-let, while a residential property in a reasonable location can typically be re-let within weeks.
Lending Approach
Residential BTL lenders primarily assess the rental income against the mortgage payment using a stress-tested ICR (interest cover ratio). Commercial BTL lenders assess more holistically:
- DSCR (Debt Service Coverage Ratio): Rental income must typically exceed mortgage payments by 1.25x to 1.50x
- Tenant covenant: The financial strength and stability of the tenant is scrutinised
- Lease terms: Unexpired lease length, break clauses, and rent review provisions are all assessed
- Property quality: Construction, condition, specification, and location are examined in detail
- Exit strategy: How the loan will be repaid at maturity
Regulation
Residential BTL mortgages are regulated by the FCA (since 2017 for portfolio landlords). Commercial BTL mortgages are unregulated, giving lenders greater flexibility in structuring deals but providing borrowers with fewer statutory protections.
Typical Rates for Commercial Buy-to-Let
Commercial BTL mortgage rates are influenced by the same factors as other [commercial mortgage rates](/knowledge-hub/commercial-mortgage-rates-uk), with particular emphasis on tenant quality and lease length.
Current Rate Ranges (2026)
| Lender Type | Typical Rate Range | Best For |
|---|---|---|
| High street banks | 5.75% - 7.00% | Strong covenant tenants, long leases, lower LTV |
| Challenger banks | 6.50% - 8.50% | Mid-market properties, moderate LTV |
| Specialist lenders | 7.50% - 10.00% | Shorter leases, higher LTV, complex cases |
What Drives the Rate?
The rate you achieve on a commercial BTL mortgage is primarily driven by:
- LTV ratio: Lower LTV equals lower rate. A deal at 50% LTV can be 1% to 2% cheaper than one at 75% LTV.
- Tenant quality: A FTSE-listed company on a 15-year FRI lease will command a meaningfully better rate than a small independent trader on a 3-year lease.
- Property sector: Industrial and logistics currently attract the best rates due to strong sector demand. Retail and leisure attract premiums due to perceived higher risk.
- Lease length: Properties with short unexpired lease terms (under 3 years) face higher rates as the lender's income certainty is reduced.
- Borrower profile: Experienced investors with strong net worth and clean credit achieve better pricing than first-time commercial investors.
Deposit Requirements
Commercial BTL mortgages require larger deposits than residential BTL:
- Minimum deposit: Typically 25% to 30% (maximum 70% to 75% LTV)
- Optimal deposit: 35% to 40% (60% to 65% LTV) unlocks the best rates and widest lender choice
- Higher LTV options: Some specialist lenders stretch to 80% LTV for exceptional cases, but at premium rates
Deposit by Property Type
The required deposit varies by sector:
| Property Type | Typical Maximum LTV | Minimum Deposit |
|---|---|---|
| Industrial/Warehouse | 75% | 25% |
| Office | 70-75% | 25-30% |
| Retail (strong covenant) | 70% | 30% |
| Retail (secondary) | 60-65% | 35-40% |
| Leisure/Pubs | 60-65% | 35-40% |
| Healthcare | 70% | 30% |
| Multi-let | 65-70% | 30-35% |
Sources of Deposit
Acceptable deposit sources for commercial BTL include:
- Cash savings or liquid investments
- Equity release from other properties
- Remortgage proceeds from existing portfolio
- Retained business profits
- Gift from family members (some lenders restrict this)
- Mezzanine finance or joint venture equity (specialist structures)
Lender Comparison for Commercial BTL
The commercial BTL lending market includes a range of lender types, each suited to different deal profiles.
High Street Banks
**Lloyds**, **NatWest**, **Barclays**, and **HSBC** offer the most competitive rates for prime commercial BTL properties. They prefer:
- Strong national or regional covenant tenants
- Long unexpired lease terms (ideally 5+ years)
- Mainstream property types in established locations
- LTV below 65%
- Experienced investors with substantial net worth
**Typical terms**: Rates from 5.75%, arrangement fees 0.5% to 1.5%, terms up to 25 years.
Challenger Banks
**Aldermore**, **Shawbrook**, **Allica Bank**, **Hampshire Trust**, and **Cambridge & Counties** are highly active in the commercial BTL space. They accept a wider range of deals than high street banks:
- Local and regional tenants accepted
- Shorter lease terms (from 12 months remaining)
- Mixed-quality locations
- Higher LTV (up to 75%)
- Less experienced investors with a clear strategy
**Typical terms**: Rates from 6.50%, arrangement fees 1% to 2%, terms up to 25 years.
Specialist Lenders
**Together**, **Octopus Real Estate**, **UTB**, and **Paragon** handle more complex commercial BTL scenarios:
- Vacant or partially vacant properties
- Non-standard construction
- Portfolio deals with multiple assets
- Borrowers with adverse credit or limited track record
- Properties requiring light refurbishment before letting
**Typical terms**: Rates from 7.50%, arrangement fees 1.5% to 2.5%, terms up to 15-20 years.
Tax Implications of Commercial Buy-to-Let
The tax treatment of commercial investment property differs materially from residential BTL, and in several ways is more favourable.
Stamp Duty Land Tax (SDLT)
Commercial properties are subject to non-residential SDLT rates:
- 0% on the first £150,000
- 2% on £150,001 to £250,000
- 5% on amounts above £250,000
Critically, there is no 3% surcharge for additional commercial properties, unlike residential investment purchases. On a £500,000 purchase, commercial SDLT is £14,500 compared to potentially £29,500 for a residential investment property (including the surcharge).
Income Tax and Mortgage Interest Relief
For individual investors, this is where commercial BTL has a significant advantage over residential BTL. The Section 24 restriction on mortgage interest tax relief, which limits residential landlords to a 20% basic rate tax credit, does not apply to commercial property. Commercial landlords can deduct the full mortgage interest as a business expense against rental income, regardless of their personal tax rate.
For a higher-rate taxpayer with a £30,000 annual mortgage interest bill, the tax saving from holding commercial rather than residential property can be substantial.
Capital Gains Tax
CGT on commercial property disposal is charged at 18% (basic rate) or 24% (higher rate) as of 2026. Business Asset Disposal Relief (formerly Entrepreneurs' Relief) may reduce the rate to 10% in certain circumstances, though this is more commonly available to owner-occupiers than pure investors.
Capital Allowances
Commercial property investors can claim capital allowances on qualifying fixtures and fittings within the property, including:
- Heating, ventilation, and air conditioning systems
- Electrical systems
- Water and sanitary installations
- Lifts and escalators
- Security and fire alarm systems
These allowances can significantly reduce your tax liability in the early years of ownership. A specialist capital allowances surveyor can identify qualifying expenditure that investors often overlook.
VAT
Commercial property transactions can be subject to VAT if the seller has opted to tax the property. This adds 20% to the purchase price, though it can be reclaimed if you also opt to tax and charge VAT on your rental income. The VAT implications of commercial property investment are complex and require specialist advice. Read our [tax relief and allowances guide](/knowledge-hub/commercial-mortgage-tax-relief-allowances) for more detail.
SPV vs Personal Name: Which Structure?
Choosing the right ownership structure is a crucial decision for commercial BTL investors.
Personal Name
**Advantages:**
- Simpler to set up and administer
- Lower ongoing compliance costs
- Capital gains tax annual exemption available
- Business Asset Disposal Relief potentially available on disposal
**Disadvantages:**
- Rental income taxed at your marginal rate (up to 45%)
- Full mortgage interest deductibility is already available for commercial property regardless of structure
- Inheritance tax exposure on property value
SPV (Special Purpose Vehicle) / Limited Company
**Advantages:**
- Corporation tax on profits currently at 25% (lower than higher rate income tax)
- Full mortgage interest deductibility (same as personal for commercial)
- Retained profits can be reinvested without personal tax liability
- Potential inheritance tax planning through share transfer
- Separation of personal and investment liabilities
**Disadvantages:**
- Double taxation when extracting profits (corporation tax plus income tax on dividends)
- Higher administration costs (accounts, company tax returns, Companies House filings)
- Some lenders charge slightly higher rates for SPV structures
- Personal guarantees typically still required by lenders
For commercial BTL, the choice between personal and SPV ownership is less clear-cut than for residential BTL, because the full mortgage interest deduction is available in both structures. The decision often comes down to your marginal tax rate, plans for profit extraction, and portfolio growth strategy. Read our [SPV and limited company guide](/knowledge-hub/spv-limited-company-commercial-mortgages) for detailed analysis.
DSCR Requirements Explained
The Debt Service Coverage Ratio is the primary affordability metric for commercial BTL mortgages. Understanding how it works helps you assess what you can borrow.
How DSCR Is Calculated
DSCR = Annual Net Rental Income / Annual Mortgage Payments
For example:
- Annual gross rent: £50,000
- Less management costs and voids allowance (10%): £5,000
- Net rental income: £45,000
- Annual mortgage payments: £30,000
- DSCR = £45,000 / £30,000 = 1.50x
A DSCR of 1.50x means the rental income exceeds the mortgage payments by 50%, giving the lender a comfortable margin.
Typical DSCR Requirements
- Minimum 1.25x: Some lenders accept this for strong deals with long leases and prime tenants
- Standard 1.30x to 1.40x: The most common requirement across the market
- Conservative 1.50x: Required by some lenders for higher-risk sectors or shorter leases
Stress Testing
Most lenders also stress test the DSCR at a notional higher interest rate, typically 2% to 3% above the actual rate or a minimum of 7% to 8%. This ensures the property can service the debt even if rates rise significantly. The stress test is often the binding constraint on how much you can borrow, not the headline DSCR requirement.
Use our [commercial mortgage calculator](/calculators/commercial-mortgage) to model different DSCR scenarios for your investment.
Property Types Suitable for Commercial BTL
Not all commercial properties make good BTL investments. Here is how the main sectors compare from an investor's perspective.
Industrial and Logistics
Currently the most popular commercial BTL sector due to strong occupier demand driven by e-commerce and nearshoring trends. Long leases to strong tenants are common, voids are short, and capital values have been resilient. Lender appetite is excellent.
Offices
A more nuanced sector post-pandemic. Well-located, modern offices with good environmental credentials remain attractive to both tenants and lenders. Secondary offices with short leases and outdated specifications are harder to finance and carry higher void risk.
Retail
Retail investment requires careful selectivity. Convenience retail (supermarkets, pharmacies, essential services) with strong covenants offers stable income. High street retail in secondary locations carries significant risk, with many lenders now cautious about this sub-sector.
Mixed-Use
[Semi-commercial properties](/knowledge-hub/semi-commercial-mortgage-guide) combining commercial and residential income offer diversification within a single asset. The residential element provides income resilience, while the commercial element can boost overall yield.
Specialist Sectors
Care homes, nurseries, medical centres, and similar specialist properties can offer excellent returns for investors who understand the sector. However, they require specialist lending knowledge and operational due diligence that goes beyond standard property investment.
Portfolio Landlord Considerations
Investors building a commercial property portfolio face additional considerations.
Portfolio Lending
Some lenders offer portfolio facilities that provide a single loan against multiple commercial properties. This can simplify administration, reduce total costs, and provide cross-collateralisation benefits. However, portfolio lending also creates concentration risk with a single lender and may include cross-default provisions.
Diversification Strategy
Spread risk across:
- Property types: Mix of industrial, office, and retail reduces sector-specific risk
- Locations: Geographic diversification protects against local economic downturns
- Tenant types: A mix of large corporate and smaller local tenants balances income security with yield
- Lease expiry profiles: Staggered lease expiries avoid concentrated void risk
Scaling Up
As your portfolio grows, consider:
- Moving from individual property loans to portfolio facilities
- Establishing relationships with multiple lenders to maintain negotiating leverage
- Building a professional team (accountant, solicitor, managing agent) who understand commercial property
- Reviewing your ownership structure as the portfolio scales — an SPV may become more beneficial at higher income levels
Read our [portfolio building guide](/knowledge-hub/building-commercial-property-portfolio) for detailed scaling strategies.
Getting Started: Your First Commercial BTL Investment
If you are considering your first commercial buy-to-let investment, here is a practical roadmap:
- Define your investment criteria: Property type, location, budget, target yield, and risk tolerance
- Arrange your deposit: Ensure funds are accessible and the source is documentable
- Get a Decision in Principle: A broker can obtain indicative mortgage terms before you commit to a purchase, giving you certainty on affordability
- Identify properties: Use commercial agents, auction catalogues, and online platforms to find suitable investments
- Analyse the deal: Assess the income, lease terms, tenant quality, and potential risks before making an offer
- Instruct professionals: Solicitor, surveyor, and accountant should all be experienced in commercial property
- Complete the purchase: Work with your broker to progress the mortgage through to completion
At Commercial Mortgages Broker, we guide investors through every step of the commercial BTL process, from initial strategy through to completion. [Contact us](/contact) to discuss your investment plans.
Frequently Asked Questions
Below we answer the most common questions about commercial buy-to-let mortgages.
*Written by Matt Lenzie, Founder of Commercial Mortgages Broker. Ex-Lloyds Bank & Bank of Scotland.*