The lowest monthly payment is not automatically the best commercial mortgage. The right structure should support the property’s income, the business’s cash flow and a credible plan for clearing the debt.
Choose the repayment method around the whole commercial case
On capital repayment, each scheduled payment normally covers interest and reduces the loan balance. On interest-only, scheduled payments normally cover interest while the original capital remains due, so the lender will want a credible way to repay it. Some lenders may consider a split structure. Availability, pricing and acceptable exit plans vary by lender and case.
Repayment structure is only part of the flexibility question. Check how commercial mortgage overpayments and early repayment charges may affect the cost of reducing or repaying the loan early.
The main commercial mortgage repayment routes
Commercial lending is assessed case by case. These descriptions explain the mechanics, not a promise that a particular lender will offer every option.
Repayment
Regular payments include interest and a capital contribution. If the agreed schedule is maintained, the balance should reduce over the term.
- Higher scheduled payments than interest-only on the same assumptions
- Less capital left for the end of the term
- Can build equity without relying entirely on a future sale or refinance
Interest-only
Regular payments cover interest, but do not normally reduce the original capital. The outstanding balance must be cleared through an accepted repayment route.
- Lower scheduled monthly payment on like-for-like assumptions
- More cash may remain in the business during the term
- Greater reliance on a credible and monitored exit plan
Part-and-part
One portion is repayment and another is interest-only. It can reduce some capital while retaining more cash flow than full repayment, where a lender permits it.
- A balance remains at the end of the term
- The split and exit still need lender approval
- Useful only when the numbers and purpose justify the compromise
How interest-only and repayment affect the decision
Compare the effect on cash flow, capital and risk rather than looking at the first monthly figure in isolation.
What the structure can change on a £500,000 loan
Assume a £500,000 commercial mortgage, a 7% annual interest rate and a 15-year term. The figures below demonstrate the mechanics only. They exclude fees, rate changes, payment timing differences and lender-specific calculations.
Interest-only illustration
Approximate interest over 15 years: £525,000. Capital still due at the end: £500,000.
Capital repayment illustration
Approximate interest over 15 years: £308,945. Scheduled capital at the end: £0, if every payment is made as modelled.
The interest-only route releases roughly £1,577 more monthly cash flow in this illustration, but it also leaves £500,000 to repay. A sound decision tests what that cash will achieve, how the exit will work and what happens if values, rates or trading performance move against the plan.
Different commercial cases create different priorities
The property type does not decide the structure on its own. The lender will also examine income, experience, deposit or equity, term and the reason for borrowing.
Owner-occupied premises
A business may prefer repayment to reduce secured debt over time. Interest-only may improve short-term cash flow, but the lender still needs confidence in trading affordability and the end-of-term plan.
Commercial investment property
The rent, lease strength, void assumptions and interest cover can influence the available structure. Repayment can reduce leverage; interest-only can preserve cash for reserves or further investment.
Refinance or capital raising
The right route depends on the present balance, valuation, equity, purpose of funds and future plan. A refinance should not simply postpone a capital problem without evidence that the next exit is workable.
A repayment strategy should still make sense under pressure
“We will refinance later” is not enough on its own. A useful plan explains why the property and borrower should remain financeable, or how another source of capital will become available.
Name the exit
Sale, refinance, retained profits, a business sale or another evidenced source of capital.
Test the timing
Allow for marketing, legal work, lease events, works, planning issues and lender processing.
Stress the assumptions
Consider lower values, higher rates, weaker rent, a trading downturn or a slower sale.
Review it regularly
Do not wait until the final months of the term to discover that the original route no longer works.
Evidence that helps a broker compare the structures
Count Ready can give a more useful first view when the enquiry includes the numbers behind both affordability and the proposed exit.
For a plain-English explanation of repayment and interest-only commercial mortgages, see the official Northern Ireland Business Info guidance.
Questions worth asking about the proposed structure
A lower payment can be attractive, but the conditions and end-of-term position determine whether it is genuinely suitable.
About the monthly commitment
- Is the payment fixed, variable or linked to a reference rate?
- How would the case perform if the rate or income changed?
- Are overpayments permitted, and do limits or charges apply?
About the remaining capital
- What balance is expected at the end of each fixed or loan term?
- Which exit has the lender assessed?
- What conditions could make a future refinance or sale harder?
About flexibility
- Can the loan move from interest-only to repayment?
- Would that require a new affordability assessment or product?
- Could a part-and-part structure achieve a better balance?
About total cost
- How much interest is payable under realistic assumptions?
- What arrangement, valuation, legal and exit costs apply?
- Does preserving cash justify carrying more debt for longer?
Repayment structures shown by current commercial mortgage guidance
These public-sector and lender sources illustrate the mechanics and show why structure, rate type and exit evidence must be checked for the individual case.
- Northern Ireland Business Info: repaying a commercial mortgage — public-sector guidance distinguishing capital-and-interest repayment from interest-only and explaining the need to evidence repayment of the remaining capital.
- NatWest fixed-rate commercial mortgage factsheet — a product-specific example of capital-and-interest and straight-line repayment profiles, with the loan term as the date by which the borrowing must be repaid.
- HMRC international financial glossary — defines a bullet loan as principal falling due at the end of the loan period and a balloon repayment as a very large, potentially back-loaded payment.
- Yorkshire Building Society commercial mortgage rates — current product examples showing that repayment structures, interest-only periods and pricing vary by property and product.
- Yorkshire Building Society commercial product table — a dated product example showing both interest-only and repayment routes across different commercial cases; availability and pricing can change.
- NatWest commercial mortgages explained — an explanation of fixed and variable commercial rates and how rate changes can affect repayments. Rate type is a separate decision from whether capital reduces.
Important limitation
The mortgage offer, facility agreement and lender assessment control the permitted repayment profile, required capital-repayment strategy, interest calculation, review conditions and final balance. Product guides change and one lender’s policy is not a market-wide rule. Obtain a written illustration for the proposed loan, rate, term and structure before deciding.
Source status: The nibusinessinfo.co.uk page and HMRC glossary provide general public-sector explanations; the NatWest and YBS pages and documents are lender-specific examples. The YBS printable product table is labelled for intermediary use only. Rate type and repayment profile are separate decisions, and none of these references replaces the mortgage offer, facility agreement or lender assessment for your case.
Last reviewed: 23 July 2026. All six references were rechecked on this date. The NatWest factsheet destination was confirmed from NatWest’s live commercial mortgage page because direct browser opening of the PDF remained blocked.
Ask Count Ready to compare the repayment routes for your case
Complete the applicant, contact, employment, income, credit, transaction, property, timing and protection questions shown in the form. In the “Please tell us more” box, add the loan required, deposit or equity, preferred term, repayment, interest-only or part-and-part preference, relevant business or rental income and the proposed exit for any interest-only balance. We will review the outline and explain which lender routes may be worth considering. Use the form for outline details only; the note below explains what not to send and how documents should be shared.
Commercial mortgage repayment questions
Clear answers to common questions about interest-only, repayment and part-and-part commercial mortgages.
What is the difference between interest-only and repayment commercial mortgages?
With a repayment commercial mortgage, scheduled payments include interest and a contribution towards the capital, so the balance should reduce over time. With interest-only, scheduled payments normally cover interest while the capital remains due and must be cleared through an accepted repayment route.
Are interest-only commercial mortgages available in the UK?
Yes, some UK commercial mortgage lenders consider interest-only borrowing. Availability depends on the property, purpose, loan-to-value, income cover, borrower and strength of the proposed exit. It should not be assumed that every lender or case will qualify.
Is an interest-only commercial mortgage cheaper?
The scheduled monthly payment is normally lower than capital repayment on the same loan, rate and term assumptions. However, the capital does not reduce through those payments, so interest may be charged on a larger balance for longer. Compare total cost, fees and end-of-term risk, not only the monthly figure.
What repayment plan may a lender accept for interest-only borrowing?
Possible routes can include selling the property, refinancing, retained business profits, a planned business sale or other evidenced capital. Each lender has its own policy. The plan must be realistic for the property, borrower and term, and some routes may not be accepted.
Can an owner-occupied business use interest-only?
Potentially. A lender will consider trading affordability, deposit or equity, management experience, property risk and how the capital will be repaid. Lower monthly payments may support cash flow, but they also leave more debt to clear later.
Can a commercial investment mortgage be on repayment?
Yes. A repayment structure can reduce the balance and build equity over time, provided the rent and wider borrower position support the higher scheduled payment. The lender will assess the lease, tenant, property, income cover and other case risks.
Can I use part interest-only and part repayment?
Some lenders may consider a part-and-part structure, where one portion reduces and another remains interest-only. The split must fit lender criteria, affordability and the exit plan for the interest-only balance.
Can I switch repayment structure later?
Possibly, but do not assume the change will be automatic. It may require lender approval, a new affordability assessment, a product change or a remortgage, and charges could apply. Check the proposed flexibility before accepting the original terms.
Does a capital repayment commercial mortgage always clear the balance by maturity?
Only if the agreed payments fully amortise the loan over the legal term and are maintained. Some capital-reducing arrangements may still leave a final balloon or bullet payment. Check the loan term, repayment or amortisation period, scheduled maturity balance and facility agreement before accepting the structure.
Useful guides for your next decision
Use these pages to test the repayment structure against loan size, term, pricing and the evidence a lender may request.
This page provides general information, not a mortgage offer, tax advice or a guarantee that a lender will accept a particular repayment structure. Commercial mortgage availability and regulation depend on the borrower, property and purpose. Terms are subject to lender assessment.