Commercial mortgage calculator

Buying business property is a major financial consideration. Use our commercial mortgage calculator to find out what the financing will cost before you take the plunge.

Page written by Chris Godfrey. Last reviewed on March 6, 2026. Next review due April 6, 2027.

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This calculator is intended for illustration purposes only and exact payment terms should be agreed with a lender before taking out a loan.

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Interest only repayment amount

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Total amount payable

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Total interest charged

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What is a commercial mortgage calculator?

A commercial mortgage calculator is a digital tool to estimate potential mortgage costs. Whether you’re looking to buy or refinance a business property, our commercial mortgage calculator helps you estimate your monthly mortgage payments based on factors such as the loan amount, interest rate, and loan term. Additionally, you can also factor in other costs such as property taxes and insurance to get a more accurate estimate of your total payments.

How do I use a commercial mortgage calculator?

To use our commercial mortgage loan calculator, simply input the loan amount, the interest rate, and the repayment term. The calculator will then generate your results, which will show you how much you’ll need to pay each month, the average monthly interest and the total amount you’ll pay over the life of the mortgage.

What effects the monthly payment amount on a commercial mortgage?

Many factors can affect the monthly payments for a commercial mortgage. These are some of the most important ones:

Loan amount: The amount of the loan will affect the monthly payment. The bigger the loan, the higher the monthly payment.
Interest rate: The interest rate is the cost of borrowing money, and it can significantly impact the monthly payment. Low interest rates generate lower monthly payments. High interest rates create higher monthly payments.
Loan term: The length of the loan term, or the duration of the loan, will affect the monthly payment. Because a longer loan term means the debt is spread across more years, you’ll pay a smaller sum per month.
Amortisation schedule: The amortisation schedule is the breakdown of the principal and interest payments over the life of the loan. Many commercial mortgages only repay interest for the first few years of the term, with repayments of principal coming later. This is known as a long amortisation schedule, and it results in lower monthly payments but over a longer period. In contrast, a shorter amortisation schedule pays the principal back sooner, which results in higher monthly payments.

It isn’t just about the mortgage. As well as adjusting for the variables above, you’ll need to take the following additional costs into account when calculating loan affordability:

Property taxes: Property taxes are a significant expense for commercial properties. The higher the taxes, the higher the monthly payment.
Insurance costs: If you’re taking out a mortgage to buy the property, the lender will demand that you insure the premises against loss by fire, flood and other risks. Depending on the type of property you buy and where it is located will determine the monthly cost of the insurance policy.
Other expenses: Routine and emergency expenses such as maintenance costs, repairs, and management fees can also affect your total monthly payment.

How is the value of a commercial mortgage determined?

The value of a commercial mortgage is determined according to the loan terms and the property being financed. Key considerations include:

Loan amount: This is the principal amount requested by the borrower. It is influenced by the property’s value, typically determined through an on-site appraisal.
Loan-to-value (LTV) ratio: Lenders assess the ratio of the loan amount to the appraised value of the property. Most commercial lenders will only lend up to 70% of the appraised value of the property. If you can provide a larger deposit to achieve a lower LTV you may gain better terms.
Property income: For income-generating properties, lenders evaluate the property’s net operating income (NOI) to ensure it can cover the mortgage payments.
Loan term and amortization: The repayment schedule affects monthly payments and the total cost of the loan.

Ultimately, the loan value represents the lender’s estimation of risk and return on the mortgage.

What affects the interest rate on commercial mortgages?

As well as macro factors such as the performance of the UK economy and the Bank of England base rate, lenders consider other factors when determining the interest rate you’ll pay. Key metrics include:

Credit score: A strong personal credit score, +700, can lead to lower interest rates.
Property condition: Properties in good condition are usually associated with lower interest rates.
Loan term: Longer-term loans often have higher interest rates but come with lower monthly payments.
Lender: Different lenders will have different risk appetites and lending criteria. This impacts the interest rates they offer.
Market conditions: Interest rates can change based on economic conditions and market demand.
Property type: The type of property being financed can affect the interest rate.
Business strength: The financial strength of the borrower’s business can also impact the interest rate.
Tenant and lease: For investment properties, the length and quality of the tenant and lease can affect the interest rate.

How can a commercial mortgage calculator help me with my eligibility?

Lenders need to see that you have the financial capacity to make the monthly mortgage payments. Affordability is an important metric to be eligible for a loan.

A commercial mortgage calculator helps estimate loan affordability. It reveals potential monthly payments that can be compared to your business income and current expenses. Essentially, if you know what you can afford to pay each month, a mortgage calculator will show you what you can borrow for that money, and it will prevent you from asking for a loan that is too large for your financial capacity. Applying for a loan where you repayment feasibility is high can increase your chances of approval.

What type of commercial mortgage can I get?

There’s more than one way to finance a business property transaction:

Commercial mortgage: The most common type of business property loan. Use a commercial mortgage to buy or refinance existing business premises.
Development finance: Get a business loan to cover the costs of building new or refurbishing or enlarging an existing commercial property.
Bridging finance: Instead of using valuable working capital, bridging finance is a short term loan to help you bridge the gap between selling your current business property and buying another.
Commercial investment mortgage: A commercial investment mortgage is a loan designed for buying or refinancing a commercial property for investment purposes – for example if you want to rent it out to other businesses or individuals.
Semi-commercial mortgage: A semi-commercial mortgage, or mixed-use mortgage, is a loan for purchasing or remortgaging a property that’s considered mixed-use. This means the property combines both residential and commercial usage, such as a retail unit with a residential flat above. You might want to buy this type of property if you’re an investor looking to generate income from residential and commercial tenants.
Owner-occupied commercial mortgage: An owner-occupied commercial mortgage is a type of commercial mortgage that’s used to buy or refinance a property intended to be the applicant’s business premises. This could be a shop, office, warehouse, etc.

How Swoop can help

Interest rates and terms and conditions for commercial property finance and other business loans can vary significantly, so it is important to shop around for the best deal. This is where Swoop can really help. Contact us to discuss your borrowing needs, get help with your application and to compare high-quality business property loans from a choice of lenders. Buy, build, invest, without putting strain on cash flow. Register with Swoop today.