Default Rate

The default rate is an elevated interest rate written into a promissory note that activates when the borrower defaults on their payment obligations. It replaces the original contract rate and is designed to compensate the lender for the increased risk, administrative burden, and carrying costs of managing a delinquent loan. Default rates typically run 3 to 10 percentage points above the note rate, though some older or privately originated notes set them even higher. For note investors, the default rate language in the promissory note directly affects the total amount owed by the borrower and the investor's potential recovery — but only if the rate is actually enforceable.

How the Default Rate Works

The default rate provision is found in the promissory note (not the mortgage or deed of trust). It specifies three things: the trigger event, the elevated rate, and when it applies.

Once triggered, accrued interest on the unpaid principal balance is calculated at the default rate rather than the original note rate. On a $100,000 balance, the difference between a 6% contract rate and an 18% default rate is $12,000 per year in additional interest accrual. Over a two- or three-year delinquency, default interest can add tens of thousands of dollars to the total debt.

State-by-State Enforceability

This is where note investors need to pay close attention. Not every state will enforce a default rate, and the rules vary significantly:

• Usury limits — Some states cap the maximum interest rate that can be charged on a residential loan. A default rate that exceeds the state usury ceiling is unenforceable and may expose the lender to penalties.
• Unconscionability challenges — Even in states without hard usury caps, courts may refuse to enforce a default rate they find unconscionable — meaning so excessive that it amounts to a penalty rather than reasonable compensation for additional risk.
• Penalty vs. liquidated damages — Courts in many jurisdictions distinguish between a legitimate estimate of the lender's increased costs (enforceable) and a punitive penalty designed to coerce payment (potentially unenforceable). A default rate of contract + 3% is more likely to survive scrutiny than one that jumps from 5% to 24%.
• Consumer protection statutes — States with strong consumer protection frameworks may impose additional restrictions on default interest for residential mortgage loans, regardless of what the note says.

As a practical matter, most institutional servicers will not apply a default rate without specific instructions from the note holder, and many will flag rates they consider potentially unenforceable in the servicing jurisdiction.

Impact on Note Investing Strategy

The default rate affects note investing at several points in the deal cycle:

During due diligence. When reviewing the collateral file, identify the default rate provision in the promissory note and research whether it is enforceable in the property's state. If the rate is unenforceable, the total amount owed may be significantly lower than what appears on the servicer's records.

When pricing. On a non-performing loan, the total payoff amount includes principal, accrued interest (potentially at the default rate), late fees, and corporate advances. If the default rate is valid and the accrued interest is substantial, the total debt may far exceed the property value — which actually increases the borrower's motivation to negotiate a discounted payoff or loan modification rather than lose the property through foreclosure.

During workout negotiations. Waiving or reducing the default rate interest is one of the most effective tools a note investor has for reaching a consensual resolution. Telling a borrower that you will forgive $30,000 in default interest as part of a modification or settlement makes the deal more palatable to the borrower while costing the investor nothing out of pocket — that interest was never collected and may never have been collectible.

Default Rate vs. Late Fees

These are related but distinct concepts:

Both can accrue simultaneously on a delinquent loan, and both are subject to state-specific enforceability rules. When modeling recovery on an NPL, be conservative about including default rate interest and late fees in your expected recovery — most resolutions, whether through modification, DPO, or foreclosure, will involve forgiving some portion of these charges.