How Is the Prime Rate Determined? The Chain from Fed Funds to Your Loan

Data as of:

The Prime Rate held at 6.75% after the March 18, 2026 FOMC decision. This article traces the five-step chain from the Fed's target rate to the rate on your loan statement and shows what borrowers actually pay at each SBA 7(a) loan size tier and across conventional products at current Prime.

The Prime Rate sits at 6.75% following the Federal Reserve's March 18, 2026 decision to hold the federal funds target range at 3.50%-3.75%, but that number is only the starting point for borrower pricing. Business loan rates follow a transmission chain that begins with the Fed and ends with your loan contract. This analysis breaks down that chain step by step, shows how Prime has moved since 2020, and outlines what borrowers actually pay across SBA and conventional products at current levels.

Prime Rate Snapshot (March 19, 2026)

  • Prime Rate: 6.75%
  • Fed Funds Target: 3.50%-3.75%
  • Convention Spread: +3.00%
  • Last Change: December 10, 2025 (cut from 7.00%)
  • Cycle Position: Holding (3+ months since last cut)
  • Next Catalyst: FOMC May 6-7, 2026

Prime typically moves within 24 hours of an FOMC decision, with borrower rates adjusting on the next billing cycle.

The Transmission Chain: From FOMC Vote to Your Loan Rate

The rate on a variable-rate business loan does not move on its own. It follows a five-step chain that begins inside the Federal Reserve and ends on your billing statement. The entire system moves quickly, often within hours at the bank level and within one billing cycle for borrowers.

The chain starts with the FOMC, the 12-member committee that votes on the federal funds target range at eight scheduled meetings per year. When the committee adjusts the target range, banks respond by moving their base lending rate, known as Prime. By long-standing convention, Prime equals the upper bound of the target range plus 3.00%. This is a market convention, not a formal rule, but it has held reliably for decades.

The Wall Street Journal then surveys the 30 largest U.S. banks. When 23 or more banks report a change, the WSJ publishes the new consensus Prime Rate. That published figure is the "WSJ Prime Rate" referenced in millions of loan contracts. Lenders update variable-rate loans on the next billing cycle, typically within 30 days.

StepWhat HappensWho DecidesHow Fast
1. FOMC DecisionSets federal funds target rangeFederal Reserve (12 voting members)8 scheduled meetings/year
2. Bank AdjustmentBanks adjust base lending rateIndividual banks (by convention, +3%)Same day or next business day
3. WSJ SurveyPolls 30 largest U.S. banksWall Street JournalWithin hours of bank announcements
4. Prime PublishedNew consensus rate publishedWSJ (when 23+ banks agree)Same business day
5. Loan RepricingVariable-rate loans adjustAutomatic (per contract terms)Next billing cycle (typically monthly)
The Prime Rate transmission chain. Each step follows the previous within hours to days. The full chain from FOMC decision to borrower rate adjustment typically completes within one billing cycle.

How Prime Has Moved Since 2020

Prime stood at 4.75% entering 2020. Two emergency FOMC cuts in March 2020 drove it from 4.75% to 3.25% in just two weeks. Prime then held at that floor for nearly two full years, from April 2020 through February 2022.

The hiking cycle that followed was the steepest in a generation. Between March 2022 and July 2023, the FOMC raised the target range at 11 consecutive meetings, pushing Prime from 3.25% to a peak of 8.50%. Prime held at 8.50% for 13 months before easing began in September 2024. Borrowers with variable-rate commercial term loans saw their interest costs climb by more than 500 basis points during the tightening cycle.

Three cuts in late 2025 brought Prime down to 6.75% by December 10, 2025. The FOMC held again on March 18, 2026. The key takeaway: Prime can move quickly during tightening cycles but often remains elevated for extended periods before easing begins.

3% 4% 5% 6% 7% 8% 9% 2020 2021 2022 2023 2024 2025 2026 3.25% COVID cuts Hiking begins Peak 8.50% Easing begins Current 6.75%
Source: Federal Reserve Board, H.15 Selected Interest Rates. FRED Series DPRIME. Monthly observations, January 2020 through March 2026.

How Prime Flows to Your Loan

Not every business loan moves with Prime. Variable-rate loans that reference "WSJ Prime Rate" in the contract adjust automatically when Prime changes. If your contract specifies Prime + 2.50%, your rate moved from 11.00% at peak (8.50% + 2.50%) down to 9.25% today (6.75% + 2.50%), a 175-basis-point reduction, without any action on your part.

SBA 7(a) loans use Prime as the base with regulated maximum spreads. The SBA caps these spreads by loan size tier, so a $400,000 loan has a lower maximum spread than a $40,000 loan. Business lines of credit typically reset monthly or quarterly based on Prime, with secured lines carrying lower spreads than unsecured.

Fixed-rate loans are a different category entirely. They reference Treasury yields at the time of origination and do not move when Prime changes. Variable borrowers rode Prime from 8.50% down to 6.75%; fixed-rate borrowers remain at their original level.

The spread, not Prime itself, is what separates borrower outcomes. Two borrowers in the same rate environment can be 300 to 600 basis points apart depending on risk profile, loan size, and structure. For a deeper look at how spreads determine actual borrowing costs, see our analysis of what borrowers actually pay vs. benchmark rates.

ProductBenchmarkSpreadRate at Prime 6.75%
SBA 7(a) over $350KPrime+ 3.00% maxup to 9.75%
SBA 7(a) $250K-$350KPrime+ 4.50% maxup to 11.25%
SBA 7(a) $50K-$250KPrime+ 6.00% maxup to 12.75%
SBA 7(a) under $50KPrime+ 6.50% maxup to 13.25%
Bank Term Loan (strong borrower)Prime+ 0.50% to 2.00%7.25%-8.75%
Bank Term Loan (average borrower)Prime+ 1.50% to 3.50%8.25%-10.25%
Business LOC (secured)Prime+ 0.50% to 2.50%7.25%-9.25%
Business LOC (unsecured)Prime+ 2.00% to 4.00%8.75%-10.75%
SBA spreads from SBA SOP 50 10 7.1 (maximum allowable). Conventional ranges are market estimates. Actual rates vary by lender, borrower qualifications, and market conditions.

What This Means for Borrowers

If You Have a Variable-Rate Loan

Your rate moves with Prime. The March 18 hold means no change this cycle. When cuts resume, your rate drops automatically on the next billing cycle. Each 25-basis-point Fed cut translates directly to a 25-basis-point reduction in your loan rate. Use the SBA 7(a) payment calculator to model how rate changes affect your monthly payment at different spread levels.

Fixed vs. Variable Decision

Fixed rates, typically referenced to Treasury yields at origination, do not move with Prime. A borrower who locked in during the peak Prime period does not benefit from subsequent cuts. The trade-off is straightforward: fixed rates protect against future increases, while variable rates capture future decreases. With the Fed in a holding pattern and market expectations pointing toward further easing later in 2026, variable-rate exposure gives borrowers the potential to benefit from additional cuts.

How to Use This Knowledge

The benchmark matters less than your spread. Ask your lender what benchmark your rate references and what spread you are paying. SBA borrowers should verify their spread against the tier maximums in the table above; if your spread exceeds the SBA maximum for your loan size, that warrants a conversation with your lender. Our business loan interest rate data tracks these benchmarks over time so you can see where current rates sit relative to recent history.

What to Watch

The FOMC held on March 18, 2026. The next meeting is May 6-7, 2026. The Fed's Summary of Economic Projections and dot plot signal the expected rate path for the remainder of 2026. If inflation data continues to moderate, the market expects cuts to resume in Q3 or Q4 2026.

Rate direction and lending standards do not always move together. When cuts do resume, Prime drops the next business day, and variable-rate loans reprice within one billing cycle. But lenders can widen spreads independently, offsetting the benefit of lower benchmarks. The Senior Loan Officer Opinion Survey (SLOOS), with the next release expected approximately in May, signals whether banks are tightening or loosening lending standards independent of Prime movements.

CapitalXO will publish an updated rate snapshot following the May FOMC decision.

Understand how rate benchmarks affect your financing costs.

Explore Financing Options

Frequently Asked Questions

Has the Prime Rate ever deviated from the Fed Funds upper bound plus 3%?

The Prime = Fed Funds upper bound + 3.00% convention has held consistently for decades, but it is a market convention, not a regulation. Individual banks can technically set their own base rates. In practice, competitive pressure ensures uniformity: once major banks move, the rest follow. The Wall Street Journal publishes the consensus rate only when 23 of the 30 largest banks agree, which effectively enforces the convention. Deviations have been extremely rare and short-lived.

How does the Prime Rate affect borrowers with existing fixed-rate loans?

It does not. Fixed-rate loans lock in the interest rate at origination, so Prime Rate movements have no effect on monthly payments or total interest cost for the remaining loan term. This is one reason borrowers accept a premium for fixed rates during uncertain rate environments: they trade a higher initial rate for immunity to future benchmark changes. Only variable-rate loans (most SBA 7(a), lines of credit, adjustable-rate term loans) reprice when Prime moves.

What happens to my variable-rate loan if the Fed raises rates instead of cutting?

Your rate increases by the same amount as the Prime Rate change, subject to your loan's repricing schedule. If the FOMC raised the target range by 25 basis points, Prime would rise by 25 basis points, and your loan rate would follow on the next adjustment date. For a $500,000 loan, each 25-basis-point increase adds roughly $1,250 per year in interest cost. Some loan contracts include rate caps that limit how high the rate can go; check your loan agreement for any ceiling provisions.

Why does the FOMC sometimes hold rates instead of cutting or raising?

The FOMC holds rates when incoming economic data does not clearly support a change in either direction. The committee weighs inflation trends, employment conditions, financial stability, and global risks at each meeting. A hold signals that the current rate level is considered appropriate given the balance of risks, not that the committee has stopped evaluating. For borrowers, a hold means variable-rate costs remain stable, giving time to plan without the urgency of an imminent rate change.

Data Sources & Methodology
  1. Federal Reserve Board - H.15 Selected Interest Rates - Federal Reserve Board. H.15 Selected Interest Rates. Series: DPRIME, SOFR. Daily, not seasonally adjusted. Data through March 17, 2026.
  2. Federal Reserve Board - FOMC Calendar and Statements - Federal Reserve Board. Federal Open Market Committee Calendar and Statements. Target range decisions and meeting schedule through March 18, 2026.
  3. SBA - Standard Operating Procedure 50 10 7.1 - U.S. Small Business Administration. SOP 50 10 7.1, Subpart B, Chapter 4: Interest Rates. Maximum allowable variable rate spreads over Prime for SBA 7(a) loans, by loan size tier.

This analysis is based on publicly available data retrieved on March 19, 2026. Rate benchmarks are point-in-time daily values, not rolling averages. SBA 7(a) maximum spreads are from SBA SOP 50 10 7.1. Conventional loan rate ranges reflect market estimates and are not sourced from a single dataset; actual rates vary by lender, borrower qualifications, collateral, and market conditions. Borrower cost examples are simplified illustrations; actual financing costs vary by lender, loan structure, underwriting criteria, fees, and borrower qualifications. This product uses the FRED API but is not endorsed or certified by the Federal Reserve Bank of St. Louis.

This article was drafted with AI assistance and reviewed for accuracy.

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