Definition
A fixed rate loan is a loan where the interest rate remains constant for the fixed-rate period (often the entire term). Because the rate doesn’t change with the market, fixed-rate debt creates more predictable debt service and reduces interest-rate volatility in your underwriting.
How It Works
With a fixed rate, the interest component of the payment is based on a set annual rate. If the loan is amortizing, the monthly payment is typically level and the split between interest and principal shifts over time. If the loan is interest-only, payments remain level because principal is not paid down during the IO period.
Common structures
- Amortizing fixed-rate: monthly payment includes principal + interest over an amortization schedule.
- Fixed rate with balloon: amortizes over a long schedule but matures sooner, leaving a balance due at maturity.
- Fixed rate with interest-only (IO): fixed interest payments during IO, then amortization begins (or balloon at maturity).
- Step-down / hybrid: fixed for a period, then adjusts (less common in commercial, more in residential hybrids).
Why It Matters
In real estate, debt service is often the largest fixed obligation. A fixed rate loan reduces the risk that rising rates will compress cash flow, weaken DSCR, or force a refinance/sale at a bad time. The tradeoff is that fixed-rate loans can be less flexible to prepay and may come with yield maintenance or defeasance.
Key Underwriting Metrics Affected
- Debt Service: stable payments make cash flow forecasts more reliable.
- DSCR: predictable coverage ratios reduce refinancing and covenant risk.
- Loan sizing: lenders may underwrite to a fixed coupon and a required DSCR.
- Refi risk: lower payment volatility during hold, but maturity still creates refi exposure.
Fixed Rate vs. Floating Rate
Floating-rate loans change with a reference rate (like SOFR) plus a spread, which can increase or decrease debt service over time. Fixed-rate loans are typically chosen for stability; floating-rate loans are often used for bridge/value-add execution where flexibility matters and the hold period may be shorter.
Typical tradeoffs
- Fixed rate: payment certainty, less interest-rate risk; often tighter prepay terms.
- Floating rate: more rate risk; may allow easier prepay; can be paired with rate caps/hedges.
Example
A property finances with a $10,000,000 fixed-rate loan at 6.00% amortizing over 30 years. Even if market rates rise, the loan’s coupon stays at 6.00%, keeping debt service predictable. If the property’s NOI is stable, DSCR remains more stable too.
If the same loan were floating at SOFR + 3.00%, an increase in SOFR would immediately raise the interest rate and reduce cash flow unless the borrower had a rate cap.
Common Pitfalls
- Ignoring prepayment costs: defeasance or yield maintenance can make early payoff expensive.
- Assuming “fixed†means no risk: maturity/refinance risk still exists, especially with a balloon.
- Overlooking IO vs amortization: IO improves cash flow but increases refi risk due to higher remaining balance.
- Not matching debt to business plan: long-term fixed debt may not fit a short bridge/value-add plan.
- Forgetting reserves/covenants: lender escrows, replacement reserves, or DSCR covenants can still constrain cash flow.