Beyond the Prime Rate: Other Benchmarks That Quietly Drive Your Borrowing Costs

Fact-checked by the Prime Rate editorial team

While most people watch the prime rate, at least five other major reference rates are actively moving the needle on what lenders charge you right now. Miss them and you are navigating your finances with an incomplete map.

After the Federal Reserve’s aggressive rate-hiking cycle pushed the federal funds rate to a two-decade high, borrowers across the country are carrying record household debt levels exceeding $20 trillion. Even small shifts in benchmark rates translate into hundreds or thousands of dollars in extra interest annually.

This guide is for anyone with a mortgage, personal loan, credit card, student loan, or HELOC. By the end, you will be able to identify which benchmark governs each of your debts, track those rates in real time, and make smarter borrowing and refinancing decisions as a result. One honest caveat up front: benchmark tracking rewards patience and consistency. If you are the type who checks your finances once a year, the timing strategies in Step 6 will be difficult to act on. The foundational knowledge in Steps 1 through 4 is still worth having regardless.

Step 1: What Are the Main Borrowing Cost Benchmarks Beyond the Prime Rate?

The main borrowing cost benchmarks beyond the prime rate include SOFR, the federal funds rate, Treasury yields (at the 2-year, 5-year, and 10-year maturities), the Constant Maturity Treasury (CMT) rate, and the Cost of Funds Index (COFI). Each one governs a different slice of the lending market.

The Major Benchmarks Explained

The federal funds rate is the overnight rate at which banks lend reserves to each other. The Federal Open Market Committee (FOMC) sets it, and it ripples outward to nearly every other borrowing cost benchmark within days., the target range is 4.25%–4.50%, per the Federal Reserve.

SOFR (Secured Overnight Financing Rate) replaced the discredited LIBOR benchmark in June 2023. It reflects the cost of borrowing cash overnight using U.S. Treasury securities as collateral. SOFR now governs most new adjustable-rate financial products in the United States.

Treasury yields are the interest rates the U.S. government pays on its debt. They function as the “risk-free rate” baseline. The 10-year yield drives fixed mortgage rates, the 5-year yield influences auto loans, and the 2-year yield is a proxy for near-term Fed policy expectations.

The COFI and CMT rates are older benchmarks still used in some legacy adjustable-rate mortgages issued before 2010. If you have an older ARM, your loan documents may reference one of these instead of SOFR.

What to Watch Out For

Many borrowers confuse the prime rate with the federal funds rate. The prime rate is simply the federal funds rate plus 3 percentage points, it is a derived number, not independently set. The real action happens at the benchmark level, where the Fed and the market compete to set the cost of money. Understanding how the prime rate affects personal loan rates is useful, but it is only one piece of a much larger puzzle.

Step 2: How Does SOFR Affect My Adjustable-Rate Mortgage and Personal Loans?

SOFR directly affects your adjustable-rate mortgage, many business loans, and some private student loans because lenders now use SOFR as the base rate when calculating your fully-indexed interest rate. Your loan’s rate equals the current SOFR plus a fixed margin set in your loan contract.

How to Calculate Your SOFR-Based Rate

Your lender will specify which SOFR term rate applies to your loan, typically the 30-day, 90-day, or 180-day SOFR average. Check your loan documents for the margin, which is usually between 2.5% and 3.5% for residential mortgages. Your current rate equals that margin plus the applicable SOFR average.

For example, if your ARM uses 90-day average SOFR at roughly 4.20% plus a margin of 2.75%, your current rate is approximately 6.95%. When SOFR drops by 0.50%, your rate drops to 6.45% automatically at your next adjustment date. The New York Fed publishes SOFR averages daily.

SOFR does have one genuine drawback worth naming: because it is based on actual overnight transactions rather than bank estimates, it can spike sharply during periods of market stress. During the March 2023 banking turmoil, SOFR-based rates jumped briefly before settling. Borrowers with LIBOR-linked loans rarely saw that kind of day-to-day movement, so SOFR-linked ARMs carry modestly more short-term volatility than their predecessors did. The smoothing effect of the 90-day or 180-day averages reduces (but does not eliminate) that risk.

What to Watch Out For

If your ARM adjusts annually, check SOFR at least 60 days before your adjustment date so you are not caught off guard by a higher payment. The New York Fed’s SOFR averages page makes this a two-minute task on any business morning.

Step 3: How Does the 10-Year Treasury Yield Affect My Mortgage Rate?

The 10-year Treasury yield is the single most important borrowing cost benchmark for fixed-rate mortgages. Lenders price 30-year fixed mortgages at a spread above the 10-year Treasury, historically averaging 1.5 to 2 percentage points, though that spread widened to over 3 percentage points during 2023–2024, according to Freddie Mac.

Why the Spread Matters as Much as the Rate

Even when the Fed cuts the federal funds rate, your mortgage rate may not fall if the 10-year Treasury yield stays elevated or if the spread between Treasuries and mortgage rates widens. This is precisely what happened in late 2023 and 2024: the Fed paused hikes, but mortgage rates stayed above 7% because Treasury yields remained high and lenders demanded a wider risk premium.

Understanding this spread helps you set realistic expectations. If the 10-year Treasury is at 4.30% and the spread is 2.50%, a 30-year fixed mortgage at 6.80% is mathematically fair, not a lender overcharge. To understand exactly how this plays out in home financing, see how the prime rate affects your mortgage and home equity loan.

What to Watch Out For

Do not assume that a Fed rate cut automatically lowers your mortgage rate. The Fed directly controls the overnight federal funds rate, a very short-term benchmark. The 10-year Treasury yield is set by global bond market supply and demand, and it can move independently of, or even against, Fed actions. Many homeowners were surprised by this in 2024. They expected mortgage relief after the Fed signaled a pivot, and the 10-year yield had other ideas.

Each benchmark operates on a different clock and affects a different set of products. Matching the right benchmark to the right loan type is the foundation of smart borrowing.

Step 4: Which Benchmark Is Driving the Interest Rate on My Specific Loan?

The benchmark driving your specific loan depends on the product type. Credit cards and HELOCs use the prime rate (tied to the federal funds rate). Adjustable mortgages issued after 2023 use SOFR. Fixed mortgages track the 10-year Treasury yield. Federal student loans are indexed to the 10-year Treasury note auction. Auto loans follow the 5-year Treasury yield most closely.

How to Find Your Benchmark in Your Loan Documents

Pull out your loan agreement or promissory note and search for the phrase “index rate” or “reference rate.” For credit cards, look for language like “Prime Rate as published in The Wall Street Journal.” For adjustable mortgages, the note will specify “1-year SOFR,” “6-month SOFR average,” or, on older loans, “1-year CMT.” Federal student loan rates are set by Congress each May based on the prior May’s 10-year Treasury auction, as explained by the U.S. Department of Education.

If you carry credit card debt, knowing that your rate tracks the prime rate, and therefore the federal funds rate, tells you exactly when relief is coming. Understanding how the prime rate affects your credit card interest rate can help you decide whether to accelerate payoff now or wait for potential Fed rate cuts. You can also use tools like a structured credit card debt payoff plan to model scenarios under different rate environments.

What to Watch Out For

Some private student loans and personal loans use a lender-proprietary benchmark that may not track any public index closely. Always ask for the specific index name in writing before signing. Loans described only as “variable rate at lender’s discretion” offer no transparency and should be treated as higher-risk products.

Step 5: How Do I Track These Benchmarks in Real Time to Make Better Borrowing Decisions?

You can track all major borrowing cost benchmarks for free using a handful of reliable sources: the New York Federal Reserve website for SOFR, the U.S. Treasury website for Treasury yields, and the Federal Reserve’s H.15 data release for a single dashboard of benchmark rates updated weekly.

The Best Free Tools to Monitor Benchmark Rates

The U.S. Treasury’s Daily Yield Curve page shows every Treasury maturity rate updated daily by 6:00 p.m. Eastern Time. Bookmark it. For SOFR, the New York Fed’s SOFR averages page publishes 30-day, 90-day, and 180-day averages every business morning by 8:00 a.m. Eastern Time.

For a one-stop dashboard, the Federal Reserve’s H.15 Selected Interest Rates release covers the federal funds rate, Treasury yields, prime rate, and SOFR in a single weekly table. You can set up a free email alert on the Fed’s website to receive it every Monday afternoon.

Mortgage rate tracking tools from Freddie Mac and Bankrate translate raw Treasury yields into actual mortgage rate estimates weekly, which is more actionable than watching raw Treasury data alone. This context is particularly useful if you are trying to time a refinance, or deciding between building a CD ladder and locking in a fixed-rate mortgage now.

What to Watch Out For

Do not confuse the Fed funds target rate with the effective federal funds rate. The target is a range (currently 4.25%–4.50%). The effective rate is the actual daily average of overnight lending transactions, which typically falls near the middle of that range. For most consumer decisions, use the target range, it is what lenders actually use to set product rates.

Step 6: How Do I Use Benchmark Knowledge to Time Refinancing or New Borrowing to Save Money?

Use benchmark knowledge to save money by targeting refinancing windows when your loan’s benchmark has fallen more than 1 percentage point below your current rate, and by locking in fixed rates when the yield curve suggests benchmarks are near their peak. These two strategies alone can save a typical borrower $10,000–$30,000 over a 30-year mortgage.

The 1% Refinancing Rule and Benchmark Timing

The classic rule is that refinancing is worth the transaction costs when your new rate is at least 1% lower than your existing rate. Benchmark tracking lets you anticipate that window before it opens. If the 10-year Treasury yield has dropped 0.75% from its peak, mortgage rates are likely to follow within 30–60 days. Contacting lenders early puts you at the front of the queue when rate locks become available.

For variable-rate debt like HELOCs and credit cards, watch the federal funds rate futures market (available free on the CME Group’s FedWatch tool) to gauge the probability of Fed rate cuts. If markets price in a 75%+ probability of a cut within 90 days, holding variable-rate debt short-term may be cheaper than locking into a fixed product today.

Using the Yield Curve as a Borrowing Signal

When the yield curve is inverted, meaning short-term rates exceed long-term rates, it historically signals an upcoming recession and rate cuts. An inverted curve can work in a borrower’s favor if you can wait: it suggests shorter-term rates (and therefore the prime rate) are likely to fall soon. However, long-term fixed rates may not fall as much, because the 10-year Treasury may already be pricing in lower future growth.

A normal, upward-sloping yield curve signals a healthy economy and often the best time to lock in long-term fixed rates before further hikes arrive. These dynamics directly affect decisions like where to park emergency savings and whether to prioritize debt payoff or investing. Reading borrowing cost benchmarks alongside the yield curve gives you a real edge over lenders who count on borrower passivity.

That said, yield curve signals are not a clean trading system. The 2-year/10-year spread was inverted for an unusually long stretch before the 2023–2024 cycle, and rate cuts came later than futures markets repeatedly predicted. Treat the yield curve as a useful directional indicator, not a precise timing tool.

What to Watch Out For

Benchmark tracking is a guide, not a guarantee. Rate lock predictions based on futures markets carry inherent uncertainty, the Fed has surprised markets repeatedly in both directions since 2020. Always build a margin of safety into your refinancing decision rather than trying to time the absolute bottom of the rate cycle. A good rate today is better than a perfect rate that never materializes.

Frequently Asked Questions

What is the difference between the prime rate and SOFR, and which one affects me more?

The prime rate affects you more directly if you have a credit card, HELOC, or variable-rate personal loan, while SOFR affects you more if you have an adjustable-rate mortgage. The prime rate is set by banks at 3 percentage points above the federal funds rate and published by the Wall Street Journal. SOFR is a market-based overnight rate published by the New York Fed, used as the base for most new adjustable-rate mortgage products issued since 2023.

How often does SOFR change and will it change my mortgage payment every month?

SOFR changes daily in the overnight market, but your mortgage payment only adjusts at the intervals specified in your loan note, typically every 6 or 12 months. Your lender uses a published average SOFR (usually the 90-day or 180-day compounded average) to smooth out daily volatility. Check your loan documents for the specific adjustment frequency and lookback period.

Does a Fed rate cut automatically lower my credit card interest rate?

Yes. A Fed rate cut directly lowers your credit card APR because credit cards are priced at the prime rate plus a margin, and the prime rate falls immediately when the FOMC cuts. If the Fed cuts by 0.25%, your credit card rate drops by 0.25% on the next billing cycle after your bank implements the change. Most major issuers update rates within one to two billing cycles, per CFPB guidance on variable-rate cards.

Why did my mortgage rate stay high even after the Fed stopped raising rates?

Your fixed mortgage rate tracks the 10-year Treasury yield, not the federal funds rate, and Treasury yields can stay elevated even after the Fed pauses hikes. This happened throughout 2023 and 2024 because inflation concerns and heavy Treasury supply kept the 10-year yield near 4.5%–5.0% even as the Fed held rates steady. The spread between the 10-year Treasury and mortgage rates also widened to historic levels, adding additional cost above what the benchmark alone explained.

Should I choose a fixed or adjustable-rate mortgage when SOFR is high?

When SOFR and the 10-year Treasury are both near cycle highs, a fixed-rate mortgage locks in those high rates permanently, which makes an ARM more attractive if you expect rates to fall within your adjustment period. However, if the yield curve is flat or inverted, the difference in initial payment between an ARM and a fixed rate may not justify the uncertainty. Use the CME FedWatch tool to check rate-cut probabilities before deciding, and review your expected holding period carefully.

What benchmark rate is used for federal student loan interest rates?

Federal student loan rates are tied to the 10-year Treasury note yield at the final auction before June 1 each year, plus a fixed statutory add-on set by Congress. For undergraduate Direct Loans, the 2024–2025 rate is 6.53%, according to the U.S. Department of Education. Graduate and PLUS loan rates carry higher add-ons. These rates are fixed for the life of the loan disbursed in that year, they do not float after origination.

How do I know if my adjustable-rate mortgage still uses LIBOR or has switched to SOFR?

All U.S. dollar LIBOR-referenced consumer loans were legally required to transition to SOFR under the Adjustable Interest Rate (LIBOR) Act by June 30, 2023. Your servicer should have notified you by mail of the transition. If you are unsure, call your loan servicer and ask for the current index rate name in writing, they are legally required to disclose it. You can also find it on your annual escrow and interest rate adjustment notice.

Can I negotiate the margin on my loan even if I cannot control the benchmark rate?

Yes. The margin is the part of your loan rate that is negotiable, because it reflects lender profit and risk premium rather than the benchmark itself. Borrowers with credit scores above 760 and loan-to-value ratios below 80% are in the strongest position to negotiate a lower margin at origination. Even a 0.25% margin reduction on a $400,000 ARM saves roughly $1,000 per year in interest. Always get margin quotes from at least three lenders before signing, and consider checking what a good credit score can unlock in terms of lender leverage.

What happens to my HELOC rate if the Fed cuts rates three times in one year?

Three Fed cuts of 0.25% each would reduce the prime rate by a total of 0.75%, and your HELOC rate would fall by the same amount at each adjustment. On a $50,000 HELOC balance, that saves approximately $375 per year in interest. HELOC rates adjust monthly (or at the end of each billing cycle), so the benefit passes through faster than with most other variable-rate products.

Are borrowing cost benchmarks relevant if I only have fixed-rate loans?

Yes, even with fixed-rate loans, monitoring borrowing cost benchmarks is valuable because they signal the best time to refinance. If your fixed mortgage rate is 7.5% and the 10-year Treasury drops to 3.8% with a normal mortgage spread of 2%, you would qualify for a roughly 5.8% rate, a difference worth hundreds of dollars per month. Benchmarks also affect the savings side of your balance sheet, helping you decide when to lock in high-yield savings rates or lock in CD rates before the Fed cuts again.

Is benchmark tracking worth the effort for someone with only one small loan?

Probably not, if the loan is small and fixed-rate. Benchmark tracking pays off most when you have a mortgage, a HELOC, or significant variable-rate debt where a half-point swing materially changes your monthly cash flow. If your only debt is a $5,000 fixed-rate personal loan with two years remaining, the time cost of weekly monitoring exceeds the financial benefit. Focus first on knowing which benchmark governs each debt you carry, then decide whether the dollar stakes justify active tracking.