Interest-Only Commercial Mortgage: A Complete Guide for UK Businesses (2026)
Pay Only the Interest, Protect Your Cash Flow
Published on 20 June 2026
What Is an Interest Only Commercial Mortgage?
An interest-only commercial mortgage is a secured business loan where monthly payments cover only the interest. No capital is repaid during the term. The full loan balance (the balloon payment) is repaid at the end.
It is not a niche product. Interest-only is widely available from UK high street banks, challenger banks, and specialist commercial lenders. It is a mainstream repayment structure used by businesses and investors across all commercial property types.
The key difference from a capital repayment mortgage: your outstanding balance stays the same throughout the term. You pay less each month. You pay more in total.
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How Does an Interest-Only Commercial Mortgage Work?
The mechanics are straightforward.
Each month you pay: loan amount x annual interest rate ÷ 12.
With an interest only mortgage, that is your only payment, so monthly repayments are usually lower than with a capital repayment mortgage. No capital reduction happens during the term, and at the end of the agreed term, typically 5 to 25 years, you repay the full original loan in one balloon payment.
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A commercial mortgage is typically structured with a shorter loan term (e.g. 5–10 years) than its amortisation period (e.g. 15–25 years). This means monthly payments are calculated as if the loan repaid over the full amortisation period, but the remaining balance falls due as a single "balloon" payment at the end of the term — usually met by refinancing or sale of the property.
This calculator provides indicative figures only and does not constitute financial advice or a loan offer. Actual rates, fees, and lender terms vary. Always confirm terms with a qualified broker or lender before proceeding.
Example Calculation
Example: £600,000 interest-only commercial mortgage at 6.5%
- Monthly payment: £600,000 x 6.5% ÷ 12 = £3,250/month
- Term: 20 years
- Total interest paid: £780,000
- Balloon payment at end of term: £600,000
- Total cost: £1,380,000
Compare that to a capital repayment mortgage on the same terms:
- Monthly payment: approximately £4,474/month
- Total cost: approximately £1,073,760
- No balloon payment
The interest-only option saves £1,224/month. Over 20 years, it costs £306,240 more in total, working the same way as other mortgage comparisons: lower monthly cost now, higher total cost overall.
Interest-Only vs Capital Repayment: Side-by-Side Comparison
Comparison Table
| Interest-Only | Capital Repayment | |
|---|---|---|
| Monthly payment (£600k @ 6.5%, 20yr) | £3,250 | £4,474 |
| Capital outstanding at year 10 | £600,000 | ~£330,000 |
| Capital outstanding at year 20 | £600,000 | £0 |
| Balloon payment required | Yes: £600,000 | No |
| Total interest paid | £780,000 | ~£473,760 |
| Total cost | £1,380,000 | ~£1,073,760 |
| Cash freed monthly | £1,224 | n/a |
Figures are illustrative. Your rate depends on LTV, business strength, and property type.
Current Interest-Only Commercial Mortgage Rates UK (2026)
Interest-only commercial mortgages are priced the same as capital repayment products from the same lender. The repayment structure does not attract a rate premium. Your rate is determined by:
- LTV ratio: lower LTV means a lower rate
- Business financials: profitability, trading history, and interest cover
- Property type: Offices and logistics attract tighter margins than retail or development
- Lender competition: rates vary significantly across the market
Across different commercial mortgage plans, terms differ by rate type, loan length, and lender appetite, and pricing can vary depending on business risk as well as property type.
Indicative Rate Table
Indicative 2026 rates for interest-only commercial mortgages in the UK can start from 5.45% per annum for stronger cases:
| Property Type | Indicative Rate Range |
|---|---|
| Prime offices / logistics | 5.5% to 7.0% |
| Industrial / warehouse | 5.5% to 7.0% |
| Retail (strong tenant) | 6.0% to 7.5% |
| Mixed-use | 6.0% to 7.5% |
| Semi-commercial | 6.0% to 8.0% |
| Development | 7.0% to 9.0%+ |
The Bank of England base rate is currently 3.75% (reduced from 5.25% in early 2025). Lender margins on prime commercial assets have narrowed by 25 to 50 basis points in recent months. This is a favourable environment for commercial borrowers.
Fixed rates are available for 2 to 5-year periods. Variable rates track the base rate plus a lender's margin. Most businesses prefer fixed payments for certainty.
Who Is an Interest-Only Commercial Mortgage Right For?
Interest-only suits businesses and investors in specific situations. It is not universally the better choice. Be clear about your reasons before choosing it.
Suitable use cases:
Buy to let and buy to let mortgages for commercial property investors. Rental income covers interest, but adding capital repayment would create a cash flow deficit. The property is held as a long-term asset. Semi commercial mortgages may also apply where the asset is a semi commercial property with both residential and commercial elements. Exit via sale or refinance is planned at term end.
Businesses preserving working capital. The monthly savings stay in the business, funding growth, stock, hiring, or investment alongside other alternative funding options for small businesses. The business has a credible plan to repay capital at term end. It can also suit a borrower buying business premises for their own business, provided the exit is credible.
SPV structures. A Special Purpose Vehicle, often set up as a limited company, holds commercial property. Investors receive rental distributions. The SPV's exit strategy (sale or refinance) is documented from the outset.
Businesses with cyclical income. Seasonal businesses or those with variable cash flow benefit from lower fixed monthly commitments and may also use invoice finance to smooth cash flow.
Development bridging into long-term hold. A developer completes a project, refinances a bridging loan for land or development onto a long-term interest-only commercial mortgage after works complete, and holds for income. Capital is not the priority during the hold period.
This structure can work for business purposes or investment, but it should be matched to the borrower’s intended use of the property.
Less suitable when:
- You have no credible exit strategy for the balloon payment
- Your income is uncertain, and you are relying on property appreciation alone
- You want to build equity progressively in the asset
- You are close to retirement or business exit, and need a clean balance sheet
Repayment Vehicles: What Exit Strategy Do Lenders Require?
This is the most important aspect of an interest only commercial mortgage application. Lenders do not offer interest-only loans without a documented repayment plan, and their eligibility criteria for these cases include a clear, evidenced exit strategy.
A vague intention to sell the property eventually is not sufficient. Lenders require a realistic, evidence-based strategy.
Accepted Exit Strategies
Accepted exit strategies:
Property sale. You plan to sell the commercial property at or before term end and repay the loan from the sale proceeds. Lenders will assess whether the current and projected property value supports this, with the security property value central to their assessment of the exit. Property values must exceed the outstanding loan at the time of sale.
Refinancing.You intend to remortgage at term end onto a new product. Lenders will assess whether your business and the property are likely to qualify for refinancing at that point. They consider your age, the property's remaining lease (if leasehold), and projected LTV.
Some structures are partially amortising rather than fully interest-only, but they still leave a balloon payment due at term end.
Accumulated business profits. You project that retained profits over the mortgage term will fund the balloon payment. Lenders scrutinise this carefully. Projections must be conservative and supported by current trading performance.
Investment maturity proceeds. You hold investments that will mature during the mortgage term. Lenders require evidence of the investment value and maturity date.
Pension or structured financial plan. Less common in commercial finance than residential, but accepted by some lenders with appropriate evidence.
The stronger and more evidenced your exit strategy, the better your terms. Lenders price risk. A clear repayment path reduces perceived risk.
Lending Criteria for Interest-Only Commercial Mortgages
The core underwriting criteria are the same as those of any commercial mortgage. Interest-only does not attract relaxed standards. In some respects, lenders look harder at applications because the balloon payment introduces additional risk.
**Trading history:**Most banks and lenders will usually want at least two years of financial accounts. They need evidence of sustainable profitability and review the business’s financial situation and business plan to judge viability. Accounts must be prepared by a qualified accountant. Tax returns must match.
A strong credit rating improves approval chances and can also help pricing, while businesses with weaker histories may need specialist bad credit business loans.
Interest cover ratio (ICR): Operating profit ÷ annual interest payments. Minimum 1.25x for most lenders. For investment properties, rental income ÷ interest is used, and some lenders assess cover against market rent on the valuation rather than passing rent. Some lenders require 1.30 to 1.40x for interest-only products.
Loan-to-value (LTV): Most interest-only commercial mortgages are available up to 70 to 75% LTV. Some specialist lenders go to 80%. Stronger ICR and exit strategy support higher LTV requests.
Deposit: Deposit requirements vary depending on the lender and risk involved, but UK lenders typically expect at least 25%, with 25% to 40% common for interest-only cases and a larger deposit usually improving loan terms. In some situations, short-term residential bridging finance for owner-occupied property can also play a role in raising deposit capital or managing timing between sales and purchases.
LTV and Deposit Table
| LTV | Deposit | Availability |
|---|---|---|
| 60% LTV | 40% deposit | Most lenders, best rates |
| 70% LTV | 30% deposit | Most lenders, standard rates |
| 75% LTV | 25% deposit | Most lenders, slightly higher rates |
| 80% LTV | 20% deposit | Specialist lenders only |
| 90% LTV | 10% deposit | Specialist sectors such as Medical, Prof Services |
Personal guarantees: Lenders require personal guarantees from directors or shareholders with 20%+ ownership. Your personal assets back the loan.
Loan terms for commercial mortgages typically range from 3 to 30 years.
Property type and condition: The property must be in appropriate commercial use. Environmental reports may be required. Specialist or unusual property types attract stricter criteria.
Exit strategy assessment: Lenders underwrite the exit strategy as a separate factor. A strong exit plan can compensate for a weaker financial profile, and vice versa.
The Real Risks: How to Manage Them
Key Risks
Interest-only commercial mortgages carry genuine risks. Understand them before committing.
Risk 1: Property values fall. If your property drops in value below the outstanding loan, you face negative equity. You cannot sell without a loss. You cannot refinance without bringing extra capital. Manage this by stress-testing your exit at property values 20 to 30% below current.
Risk 2: Refinancing becomes unavailable. Credit conditions tighten periodically. If you plan to refinance at term end, plan for the scenario where you cannot. What is your alternative exit? Having two exit options is prudent.
Risk 3: Business profits fall short. If your exit relies on accumulated profits, your business must perform. Conservative assumptions are essential. Model the exit based on flat revenue, not growth.
Risk 4: Higher total cost. You pay more in interest over the full term. This is a certainty, not a risk. Factor it into your investment analysis. The question is whether the monthly cash flow benefit justifies the higher lifetime cost for your specific situation.
How to manage risk:
- Document two credible exit strategies, not one
- Stress-test the exit at conservative property values
- Build reserve capital where possible during the mortgage term
- Make lump-sum capital overpayments in strong trading years (check for early repayment charge restrictions)
- Review your exit strategy annually; do not wait until year 18 to discover a problem
The Application Process
Step-by-Step Process
Getting an interest-only commercial mortgage follows the same stages as any commercial mortgage. The exit strategy documentation adds one additional element.
1. Prepare your documents. 2 to 3 years' accounts, tax returns, management accounts, and cash flow projections. Plus written evidence of your exit strategy: a property valuation, investment statement, or detailed profit projections. For a Decision in Principle, most lenders will also ask for basic property details on the security property, including tenure, lease terms, lease length, tenant profile, and estimated value where available before formal valuation.
2. Find the right lender. Not all lenders offer interest-only to all borrowers. Some restrict it to investment properties only. Some require minimum loan sizes. Using a commercial mortgage broker or platform like FundingSearch identifies lenders with a current appetite for your profile. A commercial mortgage calculator can help compare likely borrowing costs before you submit a full application, while small business factoring solutions can be used alongside borrowing to support day-to-day cash flow.
3. Formal application and valuation. The lender commissions an independent RICS valuation. You pay for this. Before proceeding, also factor in the other costs involved in the transaction so the deal stays affordable. A valuation is required during the application process for a commercial property purchase or refinance. The report determines maximum lending based on LTV. The lender underwrites your application in full.
4. Mortgage offer. On approval, a formal offer sets out the loan amount, interest rate, term, repayment structure, and any conditions. Review this carefully. Check early repayment charges and overpayment allowances before accepting.
5. Legal completion. Your solicitor handles conveyancing. Funds are released on completion.
Timeline: 8 to 12 weeks from application to completion for a clean transaction.
How FundingSearch Helps You Find the Right Lender
How FundingSearch Works
FundingSearch connects UK businesses with commercial mortgage lenders matched to their profile, with cases assessed differently from residential mortgages; this can matter even more where support spans commercial property, semi-commercial, and residential property-linked mixed-use assets, and high street lenders may be more restrictive on interest-only structures.
For interest-only applications, this matters more than usual. Lenders have different appetites for repayment structures, property types, LTV levels, and exit strategies. Approaching the wrong lender wastes 4 to 6 weeks and a valuation fee.
FundingSearch works differently:
- You submit your requirements once
- Your profile reaches multiple relevant lenders simultaneously
- Lenders compete, so you receive the best available terms
- Brokers guide you through exit strategy documentation, with access to a specialist team and dedicated team for more complex cases and larger loans
- Transparent fees throughout, with no hidden costs; any broker fee depends on the case and adviser arrangement
FAQ's - Interest Only Commercial Mortgages
Yes, in many cases. Commercial mortgage lending to limited companies is not FCA-regulated, so lenders have more discretion than on residential products. High street banks will typically decline applications with recent County Court Judgements (CCJs), defaults, or missed payments. Specialist and challenger lenders will consider adverse credit, particularly where the credit event is older than 3 years, has been satisfied, or is clearly explained. The strength of your exit strategy and trading performance carries significant weight. A CCJ from 5 years ago with a clean record since is very different to a default from last year. Work with a broker who knows which specialist lenders currently accept adverse credit profiles; approaching the wrong lender wastes time and leaves a footprint.
Yes. Mortgage interest on a commercial property is generally deductible as a business expense, reducing your taxable profit and therefore your corporation tax liability. Critically, only the interest element qualifies; capital repayments do not. This is one reason interest-only commercial mortgages can be more tax-efficient than capital repayment equivalents for some businesses, because 100% of the monthly payment is deductible rather than just the interest portion of a blended repayment. The rules differ depending on whether the property is held personally, through a limited company, or through a pension structure such as a SSAS or SIPP. Always verify the specific position with your accountant before proceeding.
Yes, though options are more limited than for limited companies. Most high street lenders prefer limited company structures. Sole traders can access commercial mortgages through specialist lenders, but expect stricter LTV requirements (typically 65% maximum), a requirement for at least 3 years' self-assessment tax returns, and a personal guarantee as standard. Partnerships require all partners to provide guarantees and financial statements. The key issue for lenders is the enforceability of security and continuity of income if the business changes hands or structure. If you are trading as a sole trader but the business is established and profitable, specialist brokers can find appropriate lenders.
You cannot simply ask your existing lender to roll the term forward without reassessment. At term end, the balloon payment is contractually due. Your options are: remortgage to a new interest-only product with the same or a different lender (the most common outcome); switch to a capital repayment mortgage for the remaining loan amount; or repay from your exit vehicle. If you want to extend, approach lenders 6 to 9 months before the term end. You will need to demonstrate a revised and credible exit strategy for the new term. Lenders will also reassess your age (some have maximum ages at term end, typically 70 to 75), the property's condition and value, and your current trading position. Do not leave this until the final months.
Yes, but the unexpired lease term is critical. Most lenders require the lease to extend at least 25 to 30 years beyond the mortgage term. On a 20-year mortgage, you typically need a minimum of 45 to 50 years remaining on the lease at completion. Short leasehold interests significantly restrict lender appetite and may make interest-only unavailable entirely. Ground rent review clauses, service charge obligations, and landlord consent requirements are also assessed. If you are buying a short leasehold commercial property, check the lease terms before incurring valuation and legal fees, as these will directly affect whether a mortgage is achievable and on what terms.
It can. Commercial mortgage lending is less age-restrictive than residential, but many lenders still apply maximum age limits, typically at the point of application or at term end. Common limits are 70 to 75 at term end. A 60-year-old borrower seeking a 20-year interest-only mortgage may find lender options narrowing. The exit strategy becomes especially important for older borrowers; lenders want confidence that the balloon will be repaid without reliance on the borrower continuing to trade. Buying through an SPV (Special Purpose Vehicle) or holding property within a pension structure (SSAS) can sidestep age-related restrictions in some cases. Specialist lenders are more flexible than high street banks on this point.
Not directly. Standard commercial mortgages, including interest-only products, take 8 to 12 weeks to complete. Auction purchases require completion within 28 days of the hammer falling. The standard approach is a two-stage structure: purchase at auction using a bridging loan (which can be completed in 5 to 14 days), then refinance onto a long-term interest-only commercial mortgage once the property is secured and any works are completed. This is a well-established route. The bridging loan is more expensive, but it is short-term. Factor bridge arrangement fees, interest, and exit fees into the overall acquisition cost when assessing the deal.
Yes. Both a Small Self-Administered Scheme (SSAS) and a Self-Invested Personal Pension (SIPP) can purchase commercial property and take out a commercial mortgage to fund part of the acquisition. The maximum borrowing is 50% of the pension fund's net asset value. So a SSAS with £1 million in assets could borrow up to £500,000. Rental income from the property goes back into the pension fund tax-free. The mortgage is held in the name of the pension scheme trustees, not the individual. Interest-only is commonly used within pension property purchases to maximise the income flowing back into the fund. This is a powerful tax planning structure, but it requires specialist pension trustees and legal advice.
The mortgage is secured against the property, not the business. If you sell the business but retain ownership of the property, the mortgage continues on its existing terms. The new business tenant must demonstrate sufficient income to support the interest cover ratio if the lender's covenants require it. If you sell both the business and the property, the mortgage is repaid from the sale proceeds at completion. Early repayment charges apply if you are within a fixed-rate period. If you sell the business to a buyer who also wants to acquire the property, the mortgage may be transferred (novated) to the new owner, subject to lender consent and a full reassessment of the buyer's financial position.
It is significantly harder. Lenders assess income cover as a core part of underwriting. A vacant property generates no rental income and (if it is not owner-occupied) no trading income either. Without an income source to service the interest, most mainstream lenders will decline. Specialist lenders will consider vacant commercial properties where the exit strategy is strong, the property is in good condition and a marketable location, and there is a credible plan to either let or sell within a defined timeframe. Development or refurbishment finance may be more appropriate if the property requires work before it can be occupied or let. Once tenanted, refinancing onto a standard interest-only commercial mortgage becomes straightforward.
Most mainstream commercial lenders start at £100,000 to £150,000. Some specialist lenders have higher minimums of £500,000 or above. There is no standard minimum; it varies by lender.
Most high street lenders require 2 to 3 years' trading history. Newer businesses face restricted options. Specialist lenders will consider shorter trading histories where there is a strong exit strategy, additional security, or a director with a proven track record in the same sector. Investment mortgages are calculated on the profile of the tenant(s)
A bridging loan is short-term (typically 12 to 24 months), interest-only by default, and used to bridge a gap, typically while longer-term finance is arranged or a property is sold. A commercial interest-only mortgage is a long-term product (5 to 25 years) with a planned exit at term end. Both are interest-only in structure. They serve completely different purposes and are underwritten very differently.
Yes, in most cases. Switching to capital repayment is typically straightforward, requiring a repayment schedule recalculation and lender approval. Switching the other way (from capital repayment to interest-only) requires a full reassessment of your exit strategy and financial position. Not all lenders allow it.
Yes. Refinancing an existing commercial property onto an interest-only mortgage is a common way to release capital tied up in the asset. If your property is worth £1,000,000 and you have an outstanding mortgage of £300,000, refinancing to 70% LTV releases up to £400,000 in cash (£700,000 new loan minus £300,000 repayment). That released capital can fund business growth, acquisition of another property, or working capital. The new loan is underwritten on the same basis as any interest-only commercial mortgage: ICR, exit strategy, LTV, and trading history. This approach is sometimes called a commercial remortgage with equity release.
Yes. Semi-commercial (mixed-use) properties, such as a retail unit with residential flats above, can be financed on an interest-only basis. The commercial and residential elements are assessed separately. Some lenders have dedicated semi-commercial interest-only products.