The quick read: It depends on the program piece. The Federal Open Market Committee's statement of September 16, 2026 says the Committee decided "to raise the target range for the federal funds rate by 1/4 percentage point to 3-3/4 to 4 percent," effective September 17, 2026 under the Fed's implementation note. The bank prime loan rate on FRED went from 6.75% on September 16 to 7.00% on September 17, and SBA's terms page says 7(a) maximums "are pegged to the prime rate or an optional peg rate," so variable 7(a) loans priced off prime pick up the quarter point at their next adjustment. A 504 debenture that has already sold does not move: SBA's 2026 funding schedule set the September debenture pricing date at 09/10/26, six days before the decision. A closed fixed 7(a) loan does not move either, and the 504 first-lien portion follows whatever its own note says.
How did each SBA program piece's rate basis move in September 2026?
Prime, the base most variable 7(a) loans use, rose a quarter point with the Fed in September 2026, while the 10-year Treasury yield that SBA says the 504 debenture is pegged to rose 0.29 points between September 15 and September 30 on the market's own schedule. The table reads every level from FRED with its observation date.
| Attribute | 7(a) variable | 7(a) fixed | 504 CDC debenture portion | 504 first-lien bank portion |
|---|---|---|---|---|
| Attribute Rate basis as SBA states it | 7(a) variable Base rate (prime or optional peg rate) plus a spread SBA caps | 7(a) fixed Negotiated fixed rate, subject to SBA's published maximum | 504 CDC debenture portion Pegged to an increment above the 10-year Treasury rate | 504 first-lien bank portion Set by the participating lender |
| Attribute FRED series | 7(a) variable DPRIME | 7(a) fixed DPRIME | 504 CDC debenture portion DGS10 | 504 first-lien bank portion DGS5 or DPRIME, per the note |
| Attribute Level on 2026-09-15 | 7(a) variable 6.75% | 7(a) fixed 6.75% | 504 CDC debenture portion 5.00% | 504 first-lien bank portion 4.83% / 6.75% |
| Attribute Level on 2026-09-30 | 7(a) variable 7.00% | 7(a) fixed 7.00% | 504 CDC debenture portion 5.29% | 504 first-lien bank portion 5.09% / 7.00% |
| Attribute When it resets | 7(a) variable Next adjustment date, no more often than monthly | 7(a) fixed Fixed at closing | 504 CDC debenture portion Fixed when the debenture prices | 504 first-lien bank portion As the lender's note says |
The policy rate and the decision-week tape, each read from FRED:
Federal funds target range upper limit, FRED DFEDTARU (2026-09-15): 3.75% Federal funds target range upper limit, FRED DFEDTARU (2026-09-30): 4.00% Bank prime loan rate, FRED DPRIME (2026-09-16): 6.75% Bank prime loan rate, FRED DPRIME (2026-09-17): 7.00% 10-year Treasury, FRED DGS10 (2026-09-10, September 504 pricing date): 4.95% 5-year Treasury, FRED DGS5 (2026-09-15 to 2026-09-30): 4.83% to 5.09%
The SBA 504 and 7(a) rates page explains the rate basis in full; this page is the dated record of what the hike changed for a borrower already approved or closed.
When does a variable 7(a) rate actually adjust after a prime change?
A variable 7(a) rate adjusts on the schedule written into the loan note, and SBA's rule at 13 CFR 120.214 limits that schedule: the first change can come on the first calendar day of the month after initial disbursement, later changes no more often than monthly, using the base rate in effect on the first business day of the month.
That is why a prime change in mid-September shows up in October, not on September 17. FRED shows prime at 6.75% on September 1, 2026, the first business day of September, and 7.00% on October 1, 2026, the first business day of October. A note that adjusts monthly picks up the quarter point on its next adjustment; a note that adjusts quarterly picks it up at the next quarter. The regulation also says rate changes must equal the movement in the base rate, so the spread itself does not change.
SBA caps the spread over the base rate by loan size. Its terms page prints the maximum variable rates this way:
$50,000 or less: base rate plus 6.5% $50,001 to $250,000: base rate plus 6.0% $250,001 to $350,000: base rate plus 4.5% Greater than $350,000: base rate plus 3.0%
Here is how the step reads on a loan, as an illustrative example only:
Illustrative variable 7(a) loan: $2,000,000 at prime plus an assumed 2.75 points Rate on 6.75% prime: 9.50% Rate on 7.00% prime: 9.75% Added annual interest on the full balance: about $5,000
Your own frequency, spread and any floor or ceiling are in your note. Read it before you model the change. The SBA 7(a) glossary entry covers the program basics.
Why didn't the September 504 debenture move with the Fed?
The 504 debenture rate is fixed on its monthly pricing date and SBA pegs it to an increment above the 10-year Treasury rate, not to the federal funds rate, so a debenture that sold on 09/10/26 kept its rate when the Fed raised the target range six days later.
SBA's information notice 5000-869666 publishes the 2026 calendar. It defines the pricing date as "the date that the 504 debenture rates are set" and lists 09/10/26 as the September pricing date with funding on 09/16/26, and 10/08/26 as the October pricing date. SBA's 504 page describes the rate as "Pegged to an increment above the current market rate for 10-year U.S. Treasury issues."
The 10-year Treasury tape on FRED shows what the next sale faced: 4.95% on September 10, 2026 and 5.22% on October 8, 2026. That is a Treasury move set by the market, and the September debenture rate is not printed on any source on this page's citation list, so this page does not state it. A 504 loan still waiting for its debenture sale carries Treasury risk until its pricing date. The SBA 504 glossary entry explains the CDC structure.
What did the hike change for the 504 first-lien portion and fixed 7(a) loans?
The 504 first-lien portion is priced by the participating lender under its own note, so it moved only if that note floats off prime or another index, and a fixed 7(a) loan that closed before September 17, 2026 kept its rate, because a fixed rate is set at closing and does not reset.
For the first-lien piece, check the note. A first lien priced off prime moved with the 0.25-point step from 6.75% to 7.00%. One priced off a 5-year Treasury reflects the move in that yield, which FRED shows at 4.83% on September 15 and 5.09% on September 30, 2026. A fixed first lien that already closed is unchanged.
For fixed 7(a) loans not yet closed, SBA's terms page says it "publishes the maximum fixed interest rates on SBA's FTA wiki," and the regulation at 13 CFR 120.213 says SBA "periodically publishes the maximum allowable rate in the Federal Register." Confirm with the lender which maximum applies on your closing date.
What should an owner-user with an SBA approval in hand check?
An owner-user holding an SBA approval should check four things: the base rate and adjustment schedule in a variable 7(a) note, whether the 504 debenture has priced yet, how the first-lien note is indexed, and whether debt service at the September 30, 2026 index levels still fits the business's cash flow.
Variable 7(a): confirm the adjustment frequency and the base rate date in the note, then rerun the payment on 7.00% prime. Fixed 7(a) not yet closed: confirm the rate and the SBA maximum that applies on your closing date. 504 debenture not yet sold: confirm which monthly sale the loan is scheduled for; the October 2026 pricing date was 10/08/26. 504 first lien: read the index and reset terms; a prime-indexed first lien moved with the hike.
The SBA 504 vs 7(a) comparison covers which program fits an owner-occupied purchase.
Should you close an SBA property purchase on a variable or fixed rate this quarter?
Choosing between a variable and a fixed SBA structure this quarter is a choice between paying the prime-based rate that adjusts on your note's schedule and locking a fixed rate at closing, and no published source can say where prime or Treasury yields go next. The practical step is comparing both structures side by side.
Three ways to get that comparison, with the brokerage route first:
- A commercial mortgage brokerage. YieldStack is an AI-native commercial mortgage brokerage that arranges financing for commercial real estate investors. Its deal team compares 7(a), 504 and conventional owner-user structures, negotiates spread and term on the borrower's side, and returns a median first offer in under an hour, from an institutional lender. It costs Zero upfront to submit; the broker fee is 0.50–1.00% of the loan amount and is paid only at closing.
- Going direct to one SBA lender. You see that lender's spread, index and adjustment terms, and the comparison across lenders is your own work.
- Working with a CDC on a 504 loan. The CDC handles the debenture portion; the first lien still needs its own lender and pricing.
Every credit decision is made by the lender; no loan, rate, or closing is guaranteed. To compare structures on your property, submit your SBA purchase for review. The SBA loan page covers both programs.
The bottom line
The September 2026 Fed hike reached variable 7(a) loans through prime, which rose from 6.75% to 7.00% on September 17, at each loan's next adjustment date. The September 504 debenture priced on 09/10/26, before the decision, so it did not move. Fixed 7(a) loans already closed kept their rate, and the 504 first lien follows its own note.