Commercial Yield Maintenance Penalty Calculator

What is Yield Maintenance (Defeasance)?

In Commercial Real Estate, CMBS lenders sell the future interest payments of your loan directly to bond investors. If you sell a building and pay off the loan early, those bond investors are legally robbed of their expected interest. Yield Maintenance is the financial penalty mathematically engineered to make the lender — and the bond investors behind them — completely whole.

Mathematical Foundation

\text{Penalty} = \text{Balance} \times (R_{\text{note}} - R_{\text{treasury}}) \times \left(\frac{\text{Months Remaining}}{12}\right)

R_{\text{note}}

= The original interest rate locked into your commercial mortgage. The lender expected to earn this yield for the full term.

R_{\text{treasury}}

= Today's US Treasury yield matched to the remaining term. The rate the bank can now reinvest your payoff cash at.

\text{Rate Delta}

= The spread between the two rates — this is the annual yield the lender permanently loses by accepting early payoff.

Laws & Principles

The Rate Delta Penalty: If your note rate is 5.5% and treasury rates are 3.5%, the bank loses 2.0% per year on the reinvested balance. You owe them a lump sum at payoff that covers that lost yield for every remaining month.
The 1% Asymmetric Floor: If treasury rates rise above your note rate, the math produces a negative penalty — meaning the bank should theoretically pay YOU to leave early. CMBS contracts universally prohibit this. The penalty automatically floors at exactly 1.00% of the unpaid principal balance.
CMBS vs Portfolio Loans: Portfolio lenders (held on a bank's balance sheet) often use step-down prepayment schedules (5-4-3-2-1%) instead of yield maintenance. Only CMBS and conduit loans generally require true yield maintenance calculations.

Step-by-Step Example Walkthrough

" A developer sells an apartment complex and needs to pay off a $5,000,000 CMBS loan 5 years (60 months) early. Note rate: 5.5%. Current 5-yr Treasury: 3.5%. "

Rate Delta: 5.5% − 3.5% = 2.0% lost yield spread per year.
Lost Annual Cash: 2.0% × $5,000,000 = $100,000/year the bank loses.
Penalty: $5,000,000 × 0.02 × (60 / 12) = $100,000 × 5 = $500,000.
Total Payoff Wire: $5,000,000 (principal) + $500,000 (YM penalty) = $5,500,000.

Final Result: The entire $500,000 penalty can evaporate the equity profit from the sale. Savvy CRE investors model yield maintenance before signing CMBS loans on any asset they may need to sell early.

Quick Answer: How does the Yield Maintenance Calculator work?

Enter your unpaid loan balance, original note rate, current Treasury rate, and months remaining. The calculator applies the rate delta formula to produce the exact prepayment penalty due at payoff, including the mandatory 1% floor if Treasury rates have risen above your note rate — all calculated instantly in your browser.

Yield Maintenance Formula — Step-by-Step

Step 1 — Calculate the Rate Delta

Rate Delta = Note Rate − Treasury Rate

This is the annual yield the lender permanently loses. If negative (Treasury > Note), the 1% floor activates.

Step 2 — Convert Months to Years

Years Remaining = Months Remaining ÷ 12

Step 3 — Calculate Gross Penalty

Penalty = Balance × Rate Delta × Years Remaining

Step 4 — Apply the 1% Floor (if triggered)

Final Penalty = max(Penalty, Balance × 1.0%)

Real-World Scenarios

✗ Rate Delta Penalty — Falling Rate Environment

The most damaging scenario for borrowers

Balance: $10,000,000 | Note Rate: 6.0%
Treasury Rate: 3.0% (rates have fallen)
Months Remaining: 84 (7 years)
Rate Delta: 6.0% − 3.0% = 3.0%
Penalty: $10M × 3.0% × 7 = $2,100,000

→ A $2.1M penalty on a $10M loan is catastrophic. This commonly triggers when developers try to refinance into lower rates.

✓ 1% Floor Triggered — Rising Rate Environment

The asymmetric floor protects the lender against negative math

Balance: $5,000,000 | Note Rate: 3.5%
Treasury Rate: 5.5% (rates have risen)
Months Remaining: 60 (5 years)
Rate Delta: 3.5% − 5.5% = −2.0% (negative!)
Floor Applied: $5M × 1.0% = $50,000

→ Without the floor, the math would suggest a −$500,000 "benefit" to the borrower. The contract overrides this; the minimum penalty is always $50,000.

Yield Maintenance Penalty — Rate Delta Reference ($5M | 60 Months)

Note Rate	Treasury Rate	Rate Delta	YM Penalty
6.5%	3.5%	3.0%	$750,000
5.5%	3.5%	2.0%	$500,000
5.0%	4.0%	1.0%	$250,000
4.5%	4.5%	0.0%	$50,000 (Floor)
3.5%	5.5%	−2.0%	$50,000 (Floor)

*Assumes $5M balance, 60 months remaining. 1% floor = $50,000 minimum.

Pro Tips & Borrower Pitfalls

Do This

✓Model yield maintenance before signing a CMBS loan. If your business plan involves a refinance or sale within the first 5 years, a CMBS loan at a slightly lower rate can cost far more than a portfolio loan at a higher rate with a simple step-down prepay schedule.
✓Negotiate an open period into longer CMBS loans. Many CMBS loans include a final 3–6 month "open window" before maturity where no prepayment penalty applies. Timing your sale to this window eliminates the penalty entirely.

Avoid This

✗Do not confuse yield maintenance with step-down prepayment. Step-down schedules (e.g., 5-4-3-2-1%) are fixed percentages of the balance regardless of rates. Yield maintenance is dynamic — it tracks the rate environment, making it far more dangerous in a falling-rate market.
✗Never assume the penalty is small early in the loan term. The penalty is highest in years 1–3 when the balance is large AND the most time remains. A $10M loan with 9 years remaining and a 3% rate delta carries a $2.7M penalty — larger than many deals' equity.

Frequently Asked Questions

What is the difference between yield maintenance and defeasance?

Both achieve the same goal — making the lender whole — but via different mechanisms. Yield Maintenance is a cash penalty paid directly to the servicer at payoff. Defeasance is more complex: the borrower purchases a portfolio of US Treasury or government-backed securities structured to perfectly replicate the exact payment stream of the original loan, and substitutes those securities in place of the loan collateral. Defeasance often requires 60–90 days and specialized legal counsel, but in certain market conditions can produce a lower total cost than cash yield maintenance.

Which Treasury rate do I use to calculate yield maintenance?

Use the US Treasury instrument whose remaining term most closely matches the remaining term of your loan. If you have 54 months (4.5 years) remaining, you would typically use the 5-Year Treasury yield from the most recent Treasury auction or current market quote. Your CMBS loan document's prepayment provision section will specify the exact benchmark and methodology — always defer to the contract language over any simplified formula.

Can I negotiate yield maintenance out of a CMBS loan?

Generally no — but you can negotiate at the term sheet stage. CMBS loans are securitized, meaning the loan terms are locked into a trust that cannot be individually renegotiated post-closing. Before signing, you can request: (1) a shorter lock-out period, (2) an open-window period at end of term, or (3) opt for a portfolio/bridge loan instead of CMBS, which typically offers step-down prepays rather than rate-dependent yield maintenance. Once the loan is securitized, prepay terms are immutable.

Is yield maintenance tax deductible?

The IRS generally treats yield maintenance penalties paid in connection with a real estate sale as a capital expenditure — deductible as part of the cost basis of the sold property rather than as ordinary interest expense. This means the penalty reduces your taxable capital gain from the property sale rather than providing an immediate ordinary income deduction. Tax treatment varies by entity structure and the specific facts of the transaction; consult a CPA experienced in commercial real estate for your specific situation.