SBA 504 loan rates work differently from every other SBA program — and that difference is exactly why manufacturers use the 504 for real estate and equipment. Instead of floating over the prime rate like a 7(a), the SBA portion of a 504 loan carries a fixed rate set by the bond market. Here's how the rate is actually determined, what's included in it, and how to think about timing.
The 504 Structure: Three Pieces, Two Rates
- 50% — a first-lien loan from a bank, at a rate you negotiate with that bank (fixed or variable)
- 40% — a second-lien SBA debenture issued through a Certified Development Company (CDC), at a fixed rate set at funding
- 10% — your down payment (15% for startups or special-purpose properties)
When people talk about 'the SBA 504 rate,' they mean the debenture piece. That 40% is funded by bonds sold to investors each month, so its rate is locked for the full 10, 20, or 25-year term the day the debenture prices — it never floats.
How the Debenture Rate Is Calculated
The effective 504 rate has three components: the base debenture rate, which prices at a spread over the U.S. Treasury yield of matching maturity (the 10-year Treasury for 20- and 25-year debentures); ongoing program fees, including the CDC servicing fee and SBA guarantee fee, which are amortized into the monthly payment; and the note rate math that converts semi-annual bond pricing into your monthly effective rate. The practical takeaway: when Treasury yields fall, next month's 504 debentures get cheaper — the rate follows the bond market, not the Fed's prime rate directly.
Why 504 Rates Usually Beat Conventional Commercial Mortgages
- Below-market fixed rate: debentures price near Treasury yields because investors treat them as government-backed paper
- 20-25 year fixed terms: conventional commercial mortgages typically reprice or balloon in 5-10 years; the 504 debenture never does
- 90% financing: putting 10% down instead of 25-30% keeps working capital in the business — where programs like MARC can then leverage it further
- Blended cost: even if the bank's first-lien rate matches a conventional mortgage, the fixed SBA debenture on 40% of the project pulls the blended rate down
Timing and Locking Your Rate
Debentures price once per month, and your rate is set at the pricing that follows your funding — not at application. In a falling-rate environment that lag works in your favor; in a rising one, moving your project to closing quickly matters. Note that you can't meaningfully 'shop' the debenture rate between CDCs — it's the same bond pricing nationally. What you can shop is the bank first-lien rate on the other 50%, and that's where having a broker run the bank side competitively pays for itself (our fee is paid by the lender, not you).
504 vs. 7(a) for a Manufacturing Facility
A 7(a) loan can also buy real estate, and it's simpler — one loan, one lender. But 7(a) rates float over prime, and 25-year fixed pricing is rare. For a long-hold facility, the 504's fixed debenture usually wins on total cost; see our full SBA 7(a) vs 504 comparison for manufacturers. And if the facility purchase is part of a bigger growth plan, the 504 pairs cleanly with a MARC working capital facility.
Planning a facility purchase or expansion? Get current 504 pricing for your project.
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