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CMBS calculators

By , Director, Capital Markets, Janover Capital LLC · Published

Nine free calculators for CMBS borrowers: how much you can borrow, what it costs to defease or pay yield maintenance, whether a refinance covers your balance, and what happens in special servicing. Treasury yields are read live from the U.S. Treasury; CMBS rates come from SEC loan filings for loans originated through October 19, 2026.

Getting a CMBS loan

  • CMBS loan calculator

    How much you can borrow: the debt service coverage, loan-to-value and debt yield limits, prefilled by property type from loans securitized this year, with the payment.

  • Compare loan offers

    Up to three CMBS, bank or life company offers on one page: payments, fees, the prepayment cost in your sale year and the all-in annual cost.

Living with a CMBS loan

  • Defeasance calculator

    The cost of the Treasury portfolio that replaces every payment and the balloon, priced on the live Treasury curve, with the other costs of a defeasance listed.

  • Yield maintenance calculator

    The prepayment premium under the formula in a 2026 CMBS prospectus: the interest differential over the interpolated Treasury, with the 1% minimum.

  • CMBS assumption calculator

    Assume the seller's loan or finance new: cash at closing, payments and total cost over the remaining term, and the assumption fee that breaks even.

  • CMBS refinance calculator

    The maturity gap: the new loan your income and value support at today's rate, against the balance due, and what it would take to close it.

When a CMBS loan is in trouble

  • Servicer clock

    Missed a payment or the balloon? Every contractual event the servicing agreement has already triggered, and the next one, day by day.

  • Special servicing fee calculator

    What the special servicer earns on your loan: the monthly fee, the workout fee and the liquidation fee, for each way the file can end.

  • Appraisal reduction calculator

    The appraisal reduction amount from a new appraisal, and how far it cuts the interest advanced to bondholders.

Live U.S. Treasury yields, as of October 30, 2026

1 mo
4.06%
2 mo
4.16%
3 mo
4.16%
4 mo
4.18%
6 mo
4.25%
1 yr
4.36%
2 yr
4.56%
3 yr
4.65%
5 yr
4.71%
7 yr
4.80%
10 yr
4.94%
20 yr
5.34%
30 yr
5.31%

Source: U.S. Department of the Treasury, Daily Treasury Par Yield Curve Rates, read at build and refreshed in your browser from this site's live feed. Par yields, percent.

Every tool shows its formula, a worked example and its primary sources: SEC filings for CMBS terms and loan data, the U.S. Treasury for yields. To run the special servicing tools from an AI assistant, connect it to the free cmbs.loan MCP server.

Questions people ask

Are these CMBS calculators free?

Yes, with no sign-up. The loan sizing and defeasance calculators can also be embedded on your own site with a credit link; the embed code is on each page.

Where do the rates come from?

Treasury yields come from the U.S. Department of the Treasury's daily par yield curve, read when the page was built and refreshed in your browser. Recent CMBS note rates and underwriting medians come from the asset-level data every CMBS trust files with the SEC. No rate on these pages is typed in by hand.

Are the results a quote?

No. They are estimates from your inputs and the formulas shown. Lenders set their own limits, loan documents govern prepayment and assumption terms, and a servicer's payoff statement is the final word on what you owe.

Want real numbers on your loan?

Janover Capital LLC is a commercial mortgage advisor, not a lender. Send the deal, and a person at Janover Capital will reply with how lenders are likely to size and price it.

Get a CMBS quote