How Does a Rate Increase Affect DSCR?

How Does a Rate Increase Change DSCR?

DSCR divides cash flow available for debt service by total debt service. A rate increase leaves the numerator unchanged, at least at first, and raises the denominator as floating rate loans reprice, so coverage falls. For an amortizing loan the payment rises by less than the rate change alone suggests, because principal is part of the payment.

Interest-only lines of credit feel the full change in interest expense. Amortizing term loans feel a smaller percentage change in the total payment. Either way, the borrowers to watch are those whose debt service coverage ratio was already near the bank’s policy minimum.

When Do Borrowers Feel the Increase?

It depends on how the loan is priced. Prime-based and daily SOFR loans reprice quickly, on the adjustment dates in the note. Term SOFR loans reprice at their next reset date, and fixed rate loans only when they reprice or mature. An interest rate swap protects the hedged amount for the swap’s term.

Commercial real estate loans add a second exposure at maturity. If market rates are above the original note rate, refinancing raises debt service, and higher rates can also push cap rates up and values down, which raises loan-to-value and can shrink refinance proceeds.

What Does a Rate Increase Do to DSCR? A Worked Example

Take a $2,000,000 floating rate term loan with 20-year amortization, priced at 7.25%, and a borrower with $260,000 of cash flow available for debt service. Annual debt service is about $189,700, for a DSCR of 1.37x. A quarter-point increase barely moves it; a 200 basis point increase brings it to 1.18x.

In this example, coverage would fall to 1.20x at a rate of about 9.05%, roughly 180 basis points higher, and to 1.00x at about 11.74%. That distance to the policy minimum is the number worth knowing for every floating rate borrower.

How Should Lenders Stress Test DSCR for Rate Increases?

Rerun coverage at current rates, then under a defined shock, for example 200 to 300 basis points on floating rate and maturing debt, and note the rate at which coverage falls to the policy minimum. Pair it with a cash flow sensitivity, because falling cash flow while rates rise is the scenario that breaks loans.

For borrowers with guarantors and related entities, run the same test on global cash flow, since personal floating rate debt reprices too. A single 25 basis point move rarely changes a credit decision on its own; the cumulative move, and what the borrower’s cash flow does alongside it, is what matters. This Week in Credit Risk tracks the Fed’s moves as they happen.

From Stress Test to Credit Conversation

The math is the easy part. The skill is knowing which borrowers to call first, what to ask them, and which structure gives them room: a swap or rate cap, a longer amortization or a principal paydown, with added collateral or guarantor support where coverage cannot be restored.

Those conversations rest on sound sizing and stress testing. CRE Loan Underwriting covers sizing and stress testing loans and projecting forward performance on realistic property files, and C&I Loan Underwriting teaches projecting repayment for operating businesses. A dedicated CRE Proforma, DSCR & Stress Testing learning path is coming soon.

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