Chatham Defeasance Calculator

What is a Chatham Defeasance Calculator?

A chatham defeasance calculator is an essential financial tool used by commercial real estate investors and borrowers to estimate the costs associated with the defeasance process. Unlike a simple prepayment penalty, defeasance involves the substitution of collateral. Instead of paying off the loan with cash, the borrower purchases a portfolio of US Treasury securities that generate sufficient cash flow to cover all remaining debt service payments and the final balloon payment of the original loan.

Property owners typically use a chatham defeasance calculator when they want to sell a property or refinance a loan that is locked into a Commercial Mortgage-Backed Security (CMBS) pool. Because these loans are securitized, investors expect a guaranteed stream of income. Defeasance ensures that the bondholders continue to receive their payments even after the real estate collateral is released.

Using a chatham defeasance calculator helps developers and asset managers understand the “premium” they must pay over the current loan balance. This premium is heavily influenced by the spread between the original loan’s interest rate and current US Treasury yields.

Chatham Defeasance Calculator Formula and Mathematical Explanation

The calculation behind a chatham defeasance calculator is more complex than a standard loan payoff. It is fundamentally a Present Value (PV) calculation of a series of future cash flows. The goal is to determine how much it costs today to buy Treasuries that replicate the loan’s payment schedule.

The core logic follows this sequence:

Determine the Monthly Debt Service (P&I) based on the original loan terms.
Calculate the remaining number of payments until the maturity or call date.
Determine the final balloon payment (principal balance) due at maturity.
Discount all these future cash flows back to the present using the current yield on Treasury securities.
Add legal, accounting, and servicer fees.

Table 1: Defeasance Variables and Typical Ranges
Variable	Meaning	Unit	Typical Range
Loan Balance	Current outstanding debt principal	USD ($)	$1M – $500M+
Loan Rate	Annual interest rate of the mortgage	Percentage (%)	3.5% – 7.5%
Treasury Yield	Current yield for matching maturity	Percentage (%)	2.5% – 5.5%
Transaction Fees	Third-party costs (Legal, CPA, Servicer)	USD ($)	$40k – $75k

Practical Examples (Real-World Use Cases)

Example 1: Refinancing in a Low-Rate Environment

Imagine a borrower with a $10,000,000 loan at a 5% interest rate with 48 months remaining. If current Treasury yields are at 3%, the chatham defeasance calculator would show a significant premium. This is because the borrower must buy more expensive Treasuries (paying only 3%) to generate enough cash to cover a 5% debt obligation. The resulting cost might be $10.8 million, representing an $800,000 premium plus fees.

Example 2: Selling Property Near Maturity

If a borrower has a $2,000,000 loan at 4.5% with only 12 months left, and Treasury yields are 4.25%, the premium would be relatively small. The chatham defeasance calculator would likely show a cost very close to the principal balance, as the “spread” and time remaining are both minimal. In this case, defeasance might cost $2,010,000 plus fees, making it a viable path to sale.

How to Use This Chatham Defeasance Calculator

Following these steps will ensure you get the most accurate estimate from our chatham defeasance calculator:

Step 1: Enter your current outstanding loan balance. You can find this on your most recent mortgage statement.
Step 2: Input the interest rate exactly as stated in your loan agreement.
Step 3: Calculate the number of months between today and your loan’s maturity date or “Open Window” date.
Step 4: Check current Treasury yields. For a 3-year term remaining, look at the 3-year Treasury Note yield.
Step 5: Review the results! The “Defeasance Premium” is the extra cost above your principal that you will pay to exit the loan.

Key Factors That Affect Chatham Defeasance Results

Several financial levers determine the output of the chatham defeasance calculator:

Interest Rate Spread: The difference between your loan rate and the Treasury rate is the primary driver. If Treasury rates are lower than your loan rate, you pay a premium.
Time Remaining: More time until maturity means more interest payments that must be replaced by Treasuries, increasing the cost.
Principal Amount: Larger loans naturally lead to higher absolute defeasance costs and premiums.
Market Volatility: Treasury yields change daily. A 10 basis point shift can change a $20M defeasance cost by thousands of dollars.
Fixed vs. Amortizing: If your loan is interest-only (IO), the security requirements are different than an amortizing loan.
Third-Party Fees: Defeasance requires a “successor borrower” and specialized legal counsel, adding fixed costs regardless of loan size.

Frequently Asked Questions (FAQ)

1. Is defeasance the same as a prepayment penalty?

No. A prepayment penalty is a fee paid to the lender. Defeasance is the purchase of alternative collateral (Treasuries) to replace the real estate.

2. Why does the chatham defeasance calculator show a higher cost when rates drop?

When Treasury rates drop, it becomes more expensive to buy the bonds needed to generate the same amount of interest to pay your loan.

3. Can I do a defeasance on any commercial loan?

No, it is primarily required for CMBS (securitized) loans. Standard bank loans usually use Yield Maintenance or fixed percentage penalties.

4. How long does the process take?

Generally, 30 to 45 days from the time you engage a defeasance consultant to the closing of the transaction.

5. Are transaction fees included in the premium?

Usually, no. The chatham defeasance calculator separates the “Security Cost” from the “Transaction Fees” (legal, accounting, etc.).

6. Can I benefit if Treasury rates are higher than my loan rate?

Technically yes, this is “positive arbitrage,” but most CMBS documents stipulate that the cost cannot be less than 100% of the principal balance.

7. What are the tax implications?

Defeasance costs are generally deductible as a business expense, but you should always consult a tax professional regarding your specific situation.

8. What is a “Successor Borrower”?

In defeasance, a new entity (the successor borrower) takes over the loan and the Treasury collateral, releasing the original borrower from the obligation.

Related Tools and Internal Resources

Yield Maintenance Estimator – Compare defeasance vs. yield maintenance costs.
Commercial Loan Amortization Tool – Calculate your monthly debt service and principal paydown.
CMBS Market Rate Tracker – See current spreads for new CMBS originations.
US Treasury Yield Curve – Real-time Treasury data for more accurate calculator inputs.
DSCR Calculator – Ensure your property meets lender requirements during refinance.
LTV Calculator – Determine your equity position before initiating defeasance.