Commercial Mortgage Calculator: Estimate Your Payment

A commercial mortgage calculator estimates principal and interest from the loan amount, interest rate, and amortization period. For example, a $1,000,000 loan at 7.00% amortized over 25 years produces an estimated monthly principal-and-interest payment of about $7,068. That figure does not show whether the property qualifies or whether a balloon balance will be due at maturity.

Use a commercial mortgage calculator to test assumptions, then evaluate the property’s income, equity requirement, loan structure, and total financing cost before treating the result as a financing plan.

What to enter in a commercial mortgage calculator

To calculate a commercial mortgage payment, enter the loan amount, interest rate, and amortization period. Add the loan term, down payment, fees, and any interest-only period if the calculator supports them.

Loan amount and down payment

The loan amount is the principal borrowed, not necessarily the property’s purchase price. If a property costs $1,250,000 and you contribute $250,000, the initial loan amount is $1,000,000 before financed fees or other capital sources.

Your down payment is the equity gap between the property value or purchase price and the loan amount. A larger down payment reduces the balance and monthly payment, but ties up more cash in the property.

Interest rate

The interest rate determines how much interest accrues on the unpaid balance. A higher rate increases the payment and usually increases total interest over the amortization period.

Do not treat one rate as a universal commercial mortgage rate. Pricing depends on property type, location, occupancy, cash flow, sponsor strength, leverage, recourse, loan size, lender, market conditions, and whether the rate is fixed or floating.

Amortization period and loan term

The amortization period is the schedule used to calculate each principal-and-interest payment. A 25-year amortization spreads repayment over 300 monthly payments. The loan term is how long the financing remains outstanding before maturity, which may be five, seven, or 10 years even when the payment uses a longer amortization.

A longer amortization lowers the required monthly payment but leaves more principal outstanding. A shorter amortization increases monthly cash-flow requirements while reducing principal faster.

Payment frequency, interest-only periods, and fees

Most basic estimates assume monthly payments. A term sheet may specify a different payment convention, an initial interest-only period, or a floating rate that changes over time.

Include origination fees, points, or financed closing costs only if they will be added to the loan balance. If you pay them separately, show them outside the payment calculation and include them when comparing total cash required and total financing cost.

The basic payment formula

For a fully amortizing loan, the monthly principal-and-interest payment uses the loan amount, monthly interest rate, and number of monthly payments:

Payment = loan amount × monthly rate × (1 + monthly rate)^{number of payments} ÷ ((1 + monthly rate)^{number of payments} − 1)

The calculator then separates each payment into interest and principal. Early payments contain a larger interest portion because the outstanding balance is highest at the beginning.

Commercial mortgage payment scenarios: rate, amortization, and down payment

The table compares hypothetical principal-and-interest payments on a $1,000,000 loan. It compares monthly cash flow only. Total interest and the balance due at maturity require an additional assumption about how long the loan remains outstanding, such as a 10-year term.

These figures are mathematical estimates, not quotes. The 7.00% and 25-year example costs about $625 more per month than the 6.00% and 25-year example. Extending the 7.00% amortization from 20 to 30 years lowers the payment by about $1,100 per month, but slows principal reduction and increases total interest if the loan remains outstanding for the full schedule.

For perspective, the 7.00% and 25-year example produces about $2.12 million in scheduled payments and about $1.12 million in scheduled interest over the full 25-year amortization. With a 10-year maturity, however, the borrower would have made about $848,000 in payments and still owe about $786,000. A shorter amortization raises the monthly payment but reduces both the scheduled lifetime interest and the balance remaining at the same maturity date.

Down payment changes the loan amount before the rate or amortization is applied. On a $1,250,000 property, a 20% down payment creates a $1,000,000 loan. A 30% down payment creates an $875,000 loan, reducing the estimated payment by 12.5% under the same assumptions.

Once you have an estimate, compare it with current commercial loan offers and their stated rate assumptions, fixed periods, amortization, loan purpose, and qualification conditions. Indicative pricing is not a commitment.

Worked example: a $1 million commercial mortgage

Consider a hypothetical $1,000,000 commercial mortgage at a fixed 7.00% interest rate, calculated on a 25-year amortization schedule with a 10-year maturity. The example uses monthly principal-and-interest payments and excludes fees, taxes, insurance, reserves, and other property expenses.

The answer to “What is the payment on a $1,000,000 commercial loan?” is about $7,068 per month under these assumptions. A different rate, amortization, payment structure, or loan amount produces a different result.

After 10 years, the borrower has made about $848,000 in scheduled payments. Approximately $214,000 of principal has been repaid, leaving a balance of about $786,000. If the loan matures at year 10, that remaining amount is the approximate balloon balance that must be paid, refinanced, or otherwise resolved.

Term, amortization, maturity, and balloon payment are not the same

A commercial loan term is the period until maturity. Amortization is the repayment schedule used to calculate periodic payments. Maturity is the date the remaining balance becomes due, while a balloon payment is that unpaid balance when the amortization schedule extends beyond maturity.

A 10-year term with a 25-year amortization gives you payments calculated as though the debt will be repaid over 25 years. At maturity, the remaining principal may need to be refinanced, repaid from a sale, or replaced with another capital source.

How a commercial mortgage balloon payment is calculated

A commercial mortgage balloon payment is the principal balance remaining after scheduled payments through maturity. The calculator determines the payment using the full amortization period, then applies each payment to interest and principal until maturity.

Stress-test the balance under a higher future interest rate, lower property value, slower NOI growth, and delayed sale or refinance. A loan that works at acquisition may require additional equity at maturity if the property no longer supports the same leverage or debt service.

Does the payment fit the property? Use LTV, NOI, DSCR, and debt yield

A payment estimate answers how much scheduled debt service the assumed loan creates. It does not answer how much the property can support. Commercial underwriting also considers property income, operating expenses, existing obligations, leverage, tenancy, condition, sponsor experience, and the proposed exit.

Loan-to-value and down payment

Loan-to-value, or LTV, is calculated as:

LTV = loan amount ÷ property value

A $1,000,000 loan on a $1,250,000 property has an 80% LTV. The implied equity contribution is 20%, before closing costs and reserves. You do not have to put exactly 20% down on every commercial loan. Required equity varies by asset class, property performance, sponsor profile, lender, loan purpose, and structure.

Caplli’s commercial real estate loan information describes maximum LTV of 70% to 80% depending on asset class, with strong DSCR typically at 1.20x or higher. Those are product-specific indicators, not universal approval rules. Commercial real estate financing may cover stabilized acquisitions and refinances, value-add strategies, and owner-occupied or investor properties, subject to lender requirements.

Net operating income and DSCR

Net operating income, or NOI, is property income after operating expenses but before debt service, income taxes, depreciation, and owner-level costs. Debt-service coverage ratio, or DSCR, compares NOI with annual debt service:

DSCR = NOI ÷ annual debt service

If a property produces $120,000 of NOI and estimated annual debt service is $84,812, DSCR is about 1.42x. If NOI is $100,000, DSCR is about 1.18x. The same payment can fit one property and fail another because the income supporting the debt is different.

Debt yield and borrowing capacity

Debt yield measures NOI against the loan amount:

Debt yield = NOI ÷ loan amount

With $120,000 of NOI and a $1,000,000 loan, debt yield is 12%. Unlike DSCR, debt yield does not use the interest rate or amortization. It gives a lender a quick view of property income relative to the amount borrowed.

To estimate how much commercial real estate you can afford, start with sustainable NOI, account for existing debt obligations, choose a conservative DSCR target, and solve for the annual debt service the property can support. Then test that debt service against different rates, amortizations, LTVs, reserves, and balloon balances.

Principal and interest versus interest-only payments

A principal-and-interest payment reduces the loan balance over time. An interest-only payment covers only interest during the interest-only period, so the payment is lower but principal generally remains unchanged.

For a $1,000,000 loan at 7.00%, a simple monthly interest-only estimate is about $5,833. A 25-year principal-and-interest payment under the same rate is about $7,068. The $1,235 monthly difference improves short-term cash flow, but does not reduce the balance during the interest-only period.

Interest-only financing can fit a value-add or bridge plan when renovations, lease-up, or another defined event is expected to improve the property and support a refinance or sale. It creates more exit dependence for a long-term owner. Principal amortization generally provides stronger balance reduction, though it requires more monthly cash flow.

The payment is not the full cost of commercial financing

A commercial mortgage payment estimate usually covers scheduled principal and interest. It may not include origination fees, points, appraisal costs, environmental reports, legal fees, lender charges, inspection costs, reserves, taxes, insurance, maintenance, or capital expenditures.

Loan documents can also include prepayment penalties, defeasance or yield-maintenance provisions, extension fees, minimum interest, rate floors, interest-rate caps, recourse requirements, and covenants. These terms can change the economic result even when two loans show the same monthly payment.

Compare financing using four views:

• Cash required at closing: down payment, fees, reserves, and other equity.
• Monthly and annual debt service: including scheduled principal reduction.
• Total cost: interest, points, lender fees, financing costs, and expected extension or exit costs.
• Risk at maturity: remaining balance, rate-reset exposure, prepayment terms, and the strength of the refinance or sale plan.

Current commercial mortgage rates are not one fixed number. A calculator should compare stated assumptions, not identify a guaranteed rate. For broader documentation and underwriting context, review the commercial mortgage process.

What to prepare before requesting commercial mortgage terms

A lender or finance advisor can evaluate a deal more efficiently when the property, borrower, requested structure, and repayment story are clear. Prepare:

• Property address, asset type, occupancy, purchase price, or current value.
• Requested loan amount, purpose, timing, and whether the request is for acquisition, refinance, construction, or value-add work.
• Rent roll, trailing 12-month operating statement, current income, and major expense details.
• Existing loan balance, interest rate, maturity date, payment, and prepayment terms.
• Borrower entity, ownership structure, guarantors, liquidity, credit profile, and asset-class experience.
• Recent business and personal tax returns, financial statements, and a property or project summary.
• Preferred rate type, amortization, term, recourse position, interest-only period, and expected exit.

Caplli’s application describes prequalification before lender review and a soft credit check at that stage, so the initial check does not affect the credit score. It asks for basic property and deal details, the requested loan and purpose, sponsor information, ownership and experience, recent tax returns, and a T-12 when available.

Caplli also states that a $500 credit review and due diligence fee is refunded in full if it cannot obtain terms. Lender pricing, final conditions, and closing costs should be evaluated as part of the transaction.

Choose the next step based on what your estimate shows

Use the calculator while testing purchase price, equity, rate, amortization, and cash-flow assumptions. If the property appears to support the debt, stress-test its DSCR, LTV, total cost, and maturity balance before requesting terms.

For a stabilized acquisition, refinance, or value-add commercial property, compare the financing path with the property’s income and business plan. When your assumptions and documents are ready, Caplli can use one application to pursue prequalification and match the deal with appropriate lending partners.

Caplli is a commercial finance broker and capital advisor, not a direct lender. If you are ready to discuss a specific property or financing request, submit an application for commercial financing prequalification and use the resulting terms, not a calculator estimate alone, to make the final comparison.