Prime Went Up. For Most SBA Borrowers, That Was Not the Rate Shock That Mattered.

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  Prime rate increase and SBA loan payments

The September 2026 increase added a quarter point to most variable-rate 7(a) loans, which still pay less than they did in mid-2025. The bigger move came from long-term Treasury yields, which pushed the all-in rate on new 504 loans up about a full percentage point in a year.

On September 16, 2026, the Federal Reserve raised its target range for the federal funds rate by a quarter point, to 3.75 to 4.00 percent. It was the first increase since 2023. The next day, the prime rate, the base rate most SBA 7(a) loans float on, rose from 6.75 percent to 7.00 percent. At its October 28 meeting the Fed held steady, and the Federal Reserve's own data show prime at 7.00 percent through early November.

For SBA borrowers, the headline is easy to overstate. Most 7(a) loans carry variable rates, so a prime increase does reach them, but it reverses only a third of the cuts made in late 2025. A typical variable-rate 7(a) borrower still pays a lower rate than in mid-2025, when prime stood at 7.50 percent. The more consequential move happened elsewhere. Long-term Treasury yields, which set the rate on the fixed-rate portion of SBA 504 loans, climbed to about 5.3 percent by October 2026, which one market analyst described as a 24-year high. The all-in rate on a new 20-year 504 debenture rose about one percentage point in a year.

This article works through who is exposed to the prime increase, what it does to a borrower's payment and debt service coverage, when it actually took effect, and what the evidence does and does not show about rates and SBA loan performance.

A quarter point, in context

The prime rate's path over the past eighteen months explains why the September increase feels smaller on a borrower's statement than in the headlines.

Period	Federal funds target	Prime rate
Mid-2025	4.25% to 4.50%	7.50%
After September 2025 cut	4.00% to 4.25%	7.25%
After October 2025 cut	3.75% to 4.00%	7.00%
December 11, 2025 to September 16, 2026	3.50% to 3.75%	6.75%
From September 17, 2026	3.75% to 4.00%	7.00%

Net of the September increase, prime is still 50 basis points lower than in mid-2025. One point of language is worth fixing: the Fed did not raise rates "to 7 percent." It raised the federal funds target to a top of 4 percent. Seven percent is the prime rate, which banks set and which the Fed publishes but does not control. The September monthly average of 6.87 percent that appears in some data series blends days at 6.75 and 7.00 percent and is not a rate any loan was priced on.

Markets expect more. After the October meeting, futures pricing implied roughly an 85 percent probability of another quarter-point increase in December, according to Wells Fargo Investment Institute. That is a forecast, not a decision.

How many SBA borrowers float

No current official figure says what share of 7(a) loans carry variable rates. The best evidence points to a large majority.

SBA's public loan-level data includes a fixed-or-variable indicator for every 7(a) loan, but SBA does not publish a summary of it, and we were not able to compute one from the raw files for this article. The most recent official statement is old: in 2007 testimony, the Government Accountability Office reported that nearly 90 percent of 7(a) loans carried variable rates, compared with an estimated 43 percent of conventional small business loans. The largest 7(a) lender, Live Oak Bancshares, reported in its annual filing that 88.0 percent of its outstanding loan balances were variable-rate at the end of 2025, up from 67.8 percent five years earlier. That figure covers one lender and includes some non-SBA loans. Independent readings of SBA's loan file put the variable share in a similar range, with SBA Loan Index reporting 87.6 percent of fiscal 2025 7(a) loans.

The public file has limits that matter here. It records whether a loan was variable at approval, but not which base rate it floats on, the spread over that base, how often it adjusts, or how much of the loan is still outstanding. A loan flagged as variable but carrying a five-year initial fixed period behaves like a fixed-rate loan today.

The 504 program is structured differently. According to SBA's inspector general, a 504 project is financed by a first-lien loan from a bank or other lender covering at least 50 percent, a debenture from a certified development company covering up to 40 percent and backed fully by SBA, and at least 10 percent from the borrower. The debenture carries a fixed rate set when SBA sells it. The first-lien loan can be fixed or variable, as negotiated, and is capped by regulation at 6 percentage points over the New York prime rate, currently 13.00 percent, unless state law sets a lower maximum. No public source reports what share of 504 first liens float, and the 504 loan file carries no rate fields.

The rules that govern a variable 7(a) rate

SBA limits how far a lender can price above the base rate, with the maximum depending on loan size. The current limits, set in SBA's regulations and restated in its operating procedures, are:

Loan amount	Maximum spread over base rate	Maximum rate at 7.00% prime
$50,000 or less	6.5 percentage points	13.50%
$50,001 to $250,000	6.0 percentage points	13.00%
$250,001 to $350,000	4.5 percentage points	11.50%
More than $350,000	3.0 percentage points	10.00%

The spread is fixed when the loan is made, and the rate moves with the base rate from then on. Since March 1, 2026, under an SBA procedural notice published in February, lenders may also base variable 7(a) loans on SOFR or the 5-year or 10-year Treasury rate, but the total rate may never exceed prime plus the allowed spread. Under that notice, loans priced off these alternative base rates could not be sold on the secondary market. Industry group NAGGL's summary of the revised procedures that took effect October 1, 2026 indicates they now allow such sales.

Loans priced off SOFR moved slightly more than prime-based loans over the same weeks. SOFR, as published by the Federal Reserve Bank of New York, was 3.66 percent on September 1, 2026, 3.87 percent on October 1 and 3.95 percent on November 2, an increase of 29 basis points over two monthly resets, against 25 for prime. Few SBA loans use the alternative base rates yet, and their total rate remains capped at prime plus the spread.

When the rate changes. Under SBA's regulation, a variable rate may adjust no more often than monthly. The rate used is prime as of the first business day of the adjustment period. The adjustment frequency is written into the note and cannot be changed without the borrower's consent. SBA notes that many lenders adjust quarterly, especially those that sell the guaranteed portion, and that some lenders delay the first adjustment for as long as five years. Statements that SBA loans "adjust quarterly" describe common practice, not a rule.

That timing determined when the September increase reached borrowers. Prime moved to 7.00 percent on September 17. A loan that adjusted on September 1 used 6.75 percent. Both monthly and calendar-quarter adjusters first picked up 7.00 percent at the October 1 reset. Live Oak's management described the same mechanism on an earlier earnings call, noting that its variable loans reprice on the first business day of the quarter.

How the payment changes. SBA's regulation allows the payment to be recomputed as rates change, and its operating procedures say loans are typically re-amortized at each adjustment so that they pay off by maturity. Balloon payments are not allowed. In practice, that means a rate increase usually shows up as a higher monthly payment rather than a longer loan.

What a rate increase does to the payment

The tables below show the change in monthly payment from a 25, 50 and 100 basis point increase in prime, applied at the start of the loan, with each loan priced at the maximum spread for its size. The calculations use standard monthly amortization. Lenders that accrue interest on an actual-day basis will show slightly different figures.

$1,000,000 loan at prime plus 3.00 percent, starting at 10.00 percent

Term	Payment at 10.00%	+25 bp	+50 bp	+100 bp
10 years	$13,215	+$139 a month	+$278	+$560
25 years	$9,087	+$177	+$355	+$714

$150,000 loan at prime plus 6.00 percent, starting at 13.00 percent

Term	Payment at 13.00%	+25 bp	+50 bp	+100 bp
10 years	$2,240	+$22 a month	+$44	+$89
25 years	$1,692	+$28	+$57	+$114

Two patterns matter more than the dollar amounts.

The percentage increase does not depend on loan size. At a given rate and term, a $500,000 loan and a $3,000,000 loan see the same percentage rise in payment. For a loan starting at 10.00 percent, a quarter-point increase raises the payment by about 1.05 percent over 10 years and 1.95 percent over 25 years. A full point raises it by about 4.2 percent over 10 years and 7.9 percent over 25 years.

Longer loans are more sensitive. A 25-year real estate loan reacts almost twice as strongly as a 10-year working capital or acquisition loan. Higher-rate small loans are slightly less sensitive in percentage terms, because each basis point is a smaller share of a larger rate: a full point raises a 13 percent, 25-year payment by 6.7 percent.

These are upper bounds. A rate increase that arrives later in a loan's life applies to a smaller balance over fewer remaining years. For the same $1,000,000, 25-year loan, a one-point increase five years in raises the payment by about $632 a month, against $714 if it hit at the start. The simplest rule of thumb holds at any point: each quarter point of prime adds about $2,500 a year in interest for every $1 million of outstanding balance.

What it does to debt service coverage

Debt service coverage, the ratio of cash flow available for debt service to required payments, is the test that decides whether a loan is made. SBA does not have a single minimum. The 7(a) small loan program, for loans of $350,000 or less, requires 1.10 under a procedural notice effective March 1, 2026. Under the revised procedures effective October 1, 2026, standard 7(a) loans require 1.15, most business acquisitions require 1.25, and 504 loans require 1.15 on historical results, according to consistent readings by lenders and advisers. We have not verified the revised procedures' exact wording page by page.

If the SBA loan is the borrower's only debt and cash flow stays flat, coverage falls in exact proportion to the payment increase.

Coverage at approval	Loan	+25 bp	+50 bp	+100 bp
1.10x	25-year, 13.00%	1.08x	1.06x	1.03x
1.15x	10-year, 10.00%	1.14x	1.13x	1.10x
1.15x	25-year, 10.00%	1.13x	1.11x	1.07x
1.25x	25-year, 10.00%	1.23x	1.20x	1.16x
1.35x	25-year, 10.00%	1.32x	1.30x	1.25x

Three conclusions follow. A loan approved exactly at its minimum falls below that minimum after any increase. None of these scenarios pushes a borrower below 1.0, the point at which cash flow no longer covers payments, as long as cash flow holds. And a cushion of 1.35 at approval absorbs a full point and still clears 1.25.

What these figures do not mean is equally important. SBA's coverage minimums are tests applied when a loan is made. We found no SBA requirement that coverage be maintained after closing or re-tested when the rate resets. A lender's own covenants may impose one. A borrower whose coverage drifts below the approval minimum after a rate increase has not broken an SBA rule.

Lenders are building in the margin. Live Oak's chief credit officer, Michael Cairns, said on the company's October 2026 earnings call that the bank shocks interest rates at origination, assuming borrowers will operate in an elevated rate environment at some point over the life of the loan. The bank's president, BJ Losch, said new production is underwritten at rates higher than today's.

The bigger move: 504 and long-term rates

For borrowers taking out new 504 loans, the relevant rate is not prime. The debenture rate is set as a spread over the 10-year Treasury yield, and that yield rose sharply.

At SBA's October 8, 2026 debenture sale, the comparable Treasury rate was 5.28 percent. The 20-year debenture priced at 5.78 percent and the 25-year at 5.85 percent. Once SBA, certified development company and other fees are included, the effective all-in rate on 20-year and 25-year debentures was about 6.97 percent, according to certified development companies publishing the results, and about 6.6 percent on the 10-year debenture. A year earlier, the 20-year effective rate was about 5.98 percent. That is an increase of about one percentage point, while prime fell by half a point over the same period.

The spread itself did not widen. Data presented at an October 2026 industry conference by Eagle Compliance showed the 25-year debenture spread over Treasuries at 50 basis points in September, well below its long-run average of 78. Borrowers are paying more because the underlying Treasury rate rose, not because investors demanded more.

There is partial relief for some borrowers. For 504 loans approved from October 1, 2026 through September 30, 2027, SBA waived its upfront and annual fees for manufacturers, listed food supply chain businesses and rural businesses, which certified development companies estimate lowers the effective rate by roughly 25 basis points for those borrowers.

The result is an unusual split. An existing variable-rate 7(a) borrower is paying less than in mid-2025. A business taking out a new 504 loan today is locking in a fixed rate about a point higher than a year ago, for 20 or 25 years.

Do rates explain SBA loan stress?

Credit performance at SBA lenders has weakened, and it is tempting to connect that to rates. The evidence does not support a direct link yet.

At Live Oak, annualized net charge-offs rose from 0.61 percent of loans in the third quarter of 2025 to 1.00 percent a year later, and unguaranteed nonperforming loans rose 80 percent. At NewtekOne, the provision for credit losses roughly doubled year over year, and the chief executive described nonaccruals excluding government guarantees at 3.9 percent. At Byline, nonperforming loans rose from 0.85 percent to 1.14 percent of loans.

Lenders do mention rates. Live Oak's filing for the first quarter of 2026 said elevated interest rates and inflationary pressures had placed financial strain on some small business and commercial borrowers. But when explaining realized losses, the same lenders point elsewhere. Live Oak attributed its third-quarter provision largely to a distillery portfolio it has exited and six commercial relationships, and its president described most problem loans as the product of a life event or business event rather than the economy. Byline attributed its increase to two relationships. SBA's November 2026 fiscal year release discusses the shutdown and lending standards but not rates.

Two further points weigh against a rate story for 2026. First, prime was lower for most of the period than it had been a year earlier, so variable-rate borrowers' payments generally fell. Second, the September increase took effect on October 1 for most loans, too recently to show up in any published performance data. No public source compares the performance of fixed-rate and variable-rate SBA loans in 2025 or 2026. That comparison could be built from SBA's loan file, but it has not been published.

The secondary market shows no sign of rate stress either. Byline's average net premium on sales of SBA-guaranteed loan portions rose to 10.59 percent in the third quarter of 2026, its highest in at least nine quarters, from 9.38 percent a year earlier. Stifel reported record year-to-date issuance of 7(a) pools through September, at $7.7 billion.

How to stress-test your own loan

A borrower or lender can measure exposure to further increases in a few minutes with a spreadsheet. We recommend these steps.

Start from the note. Find the base rate, the spread, the adjustment frequency and the date of the next adjustment. A loan still in an initial fixed period is not exposed until that period ends.

Use the remaining balance and remaining term. The payment after a reset depends on what is left, not on the original loan. In a spreadsheet, the new monthly payment is PMT(new annual rate divided by 12, remaining months, negative remaining balance).

Run three cases. Recalculate the payment at 25, 50 and 100 basis points above today's rate. A full point, four quarter-point moves, is a reasonable stress case. Prime moved by more than that in 2024 alone.

Recompute coverage on current cash flow. Divide the business's annual cash flow available for debt service by total annual debt payments, including any other loans. If the SBA loan is part of a larger debt load with fixed-rate debt, the decline in coverage will be smaller than the tables above suggest.

Look for the margin, not the minimum. The useful number is how far coverage stays above 1.0 under the stress case, and how far above any covenant in the loan agreement. A borrower who stays above 1.20 after a full point has room. One who drops toward 1.05 does not.

For a 504 project, run the same exercise only on the first-lien loan if it floats. The debenture's rate is fixed for its full term.

What this means

For variable-rate 7(a) borrowers: the September increase raised payments by about 1 to 2 percent for most loans, from the October reset. Payments are still lower than in mid-2025. The risk worth planning for is cumulative. If markets are right about December, and if increases continue, a full point would raise a 25-year payment by about 8 percent and take a loan approved at 1.15 coverage to about 1.07.

For borrowers considering a 504 loan: the long-term rate, not prime, is the number to watch. Today's debenture rate locks in for decades. For eligible manufacturers, food supply chain and rural businesses, the fiscal 2027 fee waiver is worth about a quarter point.

For lenders and feasibility analysts: the stress tests that matter are on term and coverage cushion, not loan size. A 25-year loan approved at its floor has almost no margin for further increases. A cushion of 0.20 above the minimum absorbs a one-point rise.

For anyone reading rate headlines: the federal funds rate, prime, the SBA maximum rate, the 504 debenture rate and the 504 effective rate are five different numbers. Most confusion about what SBA borrowers pay comes from mixing them.

What this analysis can and cannot say

It can say that prime is 7.00 percent and that the September increase reached most variable 7(a) loans at the October 1 reset; that SBA's maximum rates now run from 10.00 to 13.50 percent depending on loan size; that a rate increase raises payments by a share that depends on term, not loan size; and that new 504 borrowers face fixed rates about a point higher than a year ago.

It cannot give a current, official share of variable-rate 7(a) loans, or any figure for the dollars outstanding, because SBA publishes neither and the public file carries no balances. It cannot say what share of 504 first liens float. It cannot link 2025 or 2026 rate moves to SBA defaults, because no published data separates fixed-rate and variable-rate loan performance. And it cannot predict the Fed's next move.

Where the published record goes wrong

This series documents where commonly repeated claims fail against the data. For this topic:

• The Fed did not raise rates to 7 percent. It raised the federal funds target to 3.75 to 4.00 percent, and the prime rate moved to 7.00 percent.

• Some guides describe the SBA maximum spread for loans over $350,000 as prime plus 2.75 percent. That reflects a structure replaced in 2022. The current maximum is prime plus 3.00 percent, with no split by maturity.

• At least one widely read guide puts prime at about 8.25 percent in early 2026. Federal Reserve data show 6.75 percent from December 2025 until September 17, 2026.

• Statements that SBA rates adjust quarterly describe common practice. SBA allows monthly adjustments and longer initial fixed periods, as written in the note.

• SBA's debt service coverage minimums apply at approval. We found no SBA requirement to maintain or re-test coverage after a rate reset.

• Some sources apply the 1.10 coverage minimum for 7(a) small loans to SBA Express. SBA's March 2026 notice states that Express loans are not affected.

• The October 2026 effective rate on 20-year and 25-year 504 debentures appears as 6.97, 6.98 and about 7.2 percent, depending on the publisher. The differences reflect fee assumptions and calculation conventions. The underlying debenture rates were 5.78 and 5.85 percent.

• A widely cited estimate that about 80 percent of 7(a) loans are variable is attributed to SBA but traced to no SBA document we could find.

Sources:

• Federal Reserve, Federal Open Market Committee statements, September 16 and October 28, 2026

• Federal Reserve, H.15 Selected Interest Rates, release of November 3, 2026, and FRED series for the bank prime loan rate

• 13 CFR 120.212, 120.214 and 120.921

• U.S. Small Business Administration, Procedural Notice 5000-875051, 7(a) Alternative Base Rate Options, effective March 1, 2026, and Federal Register notice, 91 FR 5805, February 10, 2026

• U.S. Small Business Administration, Procedural Notice 5000-875701, Sunset of SBSS Score for 7(a) Small Loans, effective March 1, 2026

• U.S. Small Business Administration, Information Notices 5000-880695 and 5000-882227 on SOP 50 10 8.1

• U.S. Small Business Administration, Federal Register interest rate notices, 91 FR 39651, June 30, 2026, and 91 FR 62585, October 1, 2026

• U.S. Small Business Administration, news release 26-113, November 2, 2026

• SBA Office of Inspector General, Report 25-02

• U.S. Government Accountability Office, GAO-08-226T, November 1, 2007

• Congressional Research Service, SBA 504/CDC Loan Guaranty Program, R41184

• Live Oak Bancshares, Form 10-K for 2025, Form 10-Q for the first quarter of 2026, third quarter 2026 results and earnings call

• NewtekOne, third quarter 2026 results and earnings call

• Byline Bancorp, third quarter 2026 results and investor presentation

• NADCO, "Market Forces NOW: 504 Debenture Rates" conference presentation, October 7, 2026, including Stifel, BofA and Eagle Compliance data

• Growth Corp, SomerCor and other certified development companies, October 2026 debenture pricing

• NAGGL, summary of SOP 50 10 8.1

• Wells Fargo Investment Institute, October 28, 2026

• SBA Loan Index