Accrued Interest

Accrued interest is interest that has accumulated on a mortgage note but has not yet been collected from the borrower. Interest on a mortgage accrues daily based on the unpaid principal balance (UPB) and the note's interest rate. On a performing loan, accrued interest is simply the interest that builds up between monthly payments — it is collected when the next payment arrives. On a non-performing loan, accrued interest can accumulate for months or years without any payment, growing the total amount owed far beyond the original principal balance.

How Interest Accrues

Most residential mortgage notes use simple interest calculated on the outstanding principal balance. The daily accrual formula is:

For example, a note with a $50,000 UPB at 6% interest accrues approximately $8.22 per day, or roughly $250 per month. On a performing loan, this interest is collected as part of each monthly payment through the amortization schedule. The borrower's payment covers the accrued interest first, with the remainder applied to principal reduction.

Accrued Interest on Non-Performing Loans

When a borrower stops paying, interest continues to accrue according to the terms of the promissory note. A loan that has been non-performing for five years at 6% interest will have accumulated roughly 30% of the UPB in unpaid interest alone — on top of the principal balance, late fees, and any corporate advances made by the servicer.

This creates a gap between the contractual balance (what the borrower technically owes) and the economic value of the note (what an investor can realistically recover). The contractual balance includes all accrued interest; the economic value does not.

Why You Should Not Bid on Accrued Interest

One of the most common mistakes newer note investors make is getting excited about the total amount receivable — the UPB plus all accumulated arrears, late fees, and accrued interest. On a loan that has been non-performing for a decade, that number can look enormous.

Bid on UPB, not on arrears. Here is why:

• Borrowers rarely pay the full contractual balance. A successful loan modification typically involves forgiving or deferring a substantial portion of accrued interest to create an affordable payment.
• Foreclosure recovery is based on property value, not on what the borrower owes. If the property is worth $60,000 and the contractual balance is $120,000, you recover based on the $60,000.
• Discounted payoffs are negotiated based on what the borrower can access — not on the full amount owed.

Treat accrued interest as potential upside. If you recover some of it through a workout, that improves your return. But do not build your investment thesis around collecting it.

Accrued Interest at Foreclosure Sale

When a property goes to foreclosure auction, the note holder's credit bid or upset price typically includes the outstanding loan balance, accrued interest, legal fees, and other costs. If a third-party bidder at the sale pays more than this amount, the accrued interest is recoverable from the surplus proceeds in order of lien position. If no third-party bid exceeds the credit bid, the note holder acquires the property and the accrued interest is effectively written off as part of the conversion from a paper asset to a real estate asset.

Accrued Interest in Loan Modifications

When structuring a loan modification for a non-performing borrower, the note investor must decide what to do with the accrued interest balance. Common approaches include:

• Forgiveness — waiving the accrued interest entirely to reduce the borrower's total obligation and create an affordable fresh start
• Deferral — moving accrued interest into a non-interest-bearing deferred balance due at maturity, sale, or refinance
• Capitalization — adding accrued interest to the principal balance, which increases the loan amount but may make payments unaffordable
• Partial forgiveness — forgiving a portion and deferring or capitalizing the remainder

The right approach depends on the borrower's ability to pay, the property value relative to the total debt, and your resolution strategy. The goal is to create a modified payment the borrower can sustain while still achieving a profitable return on your investment.