An interest rate is the price of borrowing money, expressed as a percentage of the amount borrowed. Central banks like the Federal Reserve set a policy rate that ripples through the economy. But it doesn't move every rate equally: credit cards react almost immediately, mortgages barely react at all, and savings rates lag behind. This guide walks through why, using the Fed's most recent move as the example.
Key Takeaways
- A Fed rate change is not one uniform shift. It reaches a variable credit card APR almost immediately, a savings account slowly and only partially, and an existing fixed mortgage not at all.
- Credit card APRs are typically priced off the Prime rate. By convention, Prime equals the fed funds upper bound plus three percentage points, so a Fed move shows up within one or two billing cycles.
- New 30-year fixed mortgage rates track the 10-year Treasury yield, not the fed funds rate directly. They can rise even when the Fed cuts, because they move on expectations.
- Savings account yields have a low "deposit beta." Banks typically pass through only 15% to 25% of a Fed rate change to savers, and they tend to raise savings rates more slowly than they cut them.
- HELOCs, adjustable-rate mortgages after their reset date, and variable-rate student loans are the exceptions. These do move with the policy rate in something close to real time.
What Is an Interest Rate?
An interest rate is the cost of borrowing, or the reward for lending, stated as a percentage of the principal over a year. A lender charges it because money has a time value. A dollar available today is worth more than a dollar promised next year. Every loan, deposit account, and bond carries a rate that reflects this trade-off between a lender's risk and a borrower's need for cash now.
Fixed Rate vs. Variable Rate
A fixed rate stays the same for the life of a loan or account. A payment calculated today will not change next year, regardless of what the Fed does. A variable rate is tied to a reference rate, such as the Prime rate, and moves as that reference moves. Most 30-year mortgages are fixed; most credit cards and home equity lines of credit are variable.
APY vs. APR
APR, or annual percentage rate, is the simple yearly cost of borrowing, without accounting for compounding. APY, or annual percentage yield, is what a saver actually earns in a year once compounding is included. It is usually the number quoted on a savings account. The two describe similar math from opposite sides of a transaction: APR measures what a borrower pays, and APY measures what a saver earns.
The Federal Funds Rate, Explained
The federal funds rate is the rate at which banks lend reserves to each other overnight. It is the one rate the Federal Reserve directly controls. The Fed sets a target range for it at each of its eight scheduled meetings a year. That target range is what news coverage means by "the Fed rate." As of September 2026, following a 25 basis point increase announced on September 16, 2026, the target range stands at 3.75% to 4.00%.
A basis point is one-hundredth of one percentage point. So 25 basis points equals 0.25%, and 100 basis points equals a full percentage point. Financial professionals use basis points because rate moves are often small. "25 basis points" is simply more precise in conversation than "a quarter of a percent." From the Fed's target range, the rest of the household lending system builds outward, but not by copying the number directly.
The Prime rate is the base rate many US banks use to price variable-rate loans. It follows a well-established convention: Prime equals the upper end of the fed funds target range, plus three percentage points.
With the fed funds range at 3.75% to 4.00%, the upper bound is 4.00%. Add three points, and Prime calculates to 7.00%, exactly the WSJ Prime Rate reading in effect as of September 17, 2026. That fixed three-point spread is why a Fed move and a Prime move happen together, almost mechanically, even though the Fed does not set Prime directly.
Where a Fed Move Shows Up: The Transmission Table
Different loans and accounts are priced off different reference rates. Because of that, a single Fed move does not travel through the household lending system evenly. The table below summarizes what each major product is priced off, how quickly it typically responds, and whether an existing balance actually changes.
| Product | Priced off | How fast it follows a Fed move | Existing balance affected? |
|---|---|---|---|
| Savings account / HYSA | The policy rate, filtered through each bank's own deposit beta (typically 15%–25% pass-through) | Weeks to months, and only partially | Yes, but muted; banks are typically slower to raise this rate than to cut it |
| Credit card (variable APR) | The WSJ Prime rate (fed funds upper bound plus 3.00 points) plus an issuer margin | About one to two billing cycles | Yes; among the fastest-transmitting consumer rates |
| 30-year fixed mortgage (new) | The 10-year Treasury yield plus a spread, not the fed funds rate directly | Moves on rate expectations; can shift before, or even opposite to, a given Fed decision | No; an existing fixed-rate mortgage never changes |
| Auto loan (new) | Shorter-term Treasuries plus a credit spread set at origination | Fixed once originated; reacts only when a new loan is taken out | No; an existing auto loan is fixed for the life of the loan |
| HELOC / ARM after reset / variable student loan | Prime rate or SOFR, plus a margin | A HELOC typically adjusts within about one statement cycle; an ARM adjusts only on its own reset date | Yes; the one category that tracks the policy rate in near-real time |
The pattern in that table is the whole story of this article. Borrowing that resets often, like a credit card, moves with the Fed almost immediately. Borrowing locked in for decades, like a fixed mortgage, never moves once it exists. A new loan, by contrast, is priced on an entirely different rate.
Credit Cards: The Fastest Mover
A variable-rate credit card is typically priced as the Prime rate plus a margin. The issuer sets that margin based on a cardholder's creditworthiness. Because Prime tracks the fed funds upper bound plus three points by convention, a 25 basis point Fed move flows into most variable card APRs within one to two billing cycles. That makes credit cards the fastest-transmitting consumer rate in the household lending system, and it applies to balances a cardholder already carries, not only to new charges.
As of the second quarter of 2026, the average APR on credit card accounts actively accruing interest was 22.15%. That figure comes from the Federal Reserve's G.19 Consumer Credit release, up from 21.52% in the first quarter. It is the backdrop against which any Fed move lands.
A Worked Example: +25 Basis Points on a $5,000 Card Balance
Consider a household carrying a $5,000 revolving balance at that 22.15% average APR. A 25 basis point increase to 22.40% raises the monthly interest cost on that balance from about $92.29 to about $93.33. That is a difference of roughly $1.04 a month. Carried for a full year at the higher rate, the gap adds up to about $12.50.
The dollar figure looks small on its own, but the mechanism is the point. A card's APR reprices almost in step with Prime, so the increase applies to the balance a household is already carrying, not just to future borrowing. A household paying a card balance in full every month does not feel this transmission at all, since no interest accrues on a balance that is paid in full.
Savings Accounts and HYSAs: Slower, and Only Partial
Savings and high-yield savings accounts are supposed to benefit when the Fed raises rates. In practice, the benefit is small and slow to arrive. The reason is a concept researchers call deposit beta: the share of a Fed rate change a bank actually passes through to what it pays savers. Research from the Federal Reserve Bank of New York's Liberty Street Economics finds savings accounts historically show deposit betas of roughly 15% to 25%. That means banks typically keep most of a rate increase rather than pass it to depositors.
Banks also tend to move asymmetrically. They are slower to raise savings rates when the Fed hikes than they are to cut savings rates when the Fed eases. That asymmetry helps explain why the FDIC's national average savings rate sat at just 0.38% APY in its August 2026 release, even after a policy cycle that swung from near zero in 2022 to above 5% and back to nearly 4% by September 2026.
A bank with a large branch network and a bank operating mostly online can post very different deposit betas for the same Fed move. That difference is part of why shopping around for high-yield savings accounts matters more than the size of any single Fed decision.
The national average blends banks that pass through very little of a rate change with banks that pass through much more. So an individual saver's own account can move by more, or less, than the headline number suggests. A saver who has not checked their account's rate since opening it may be earning well below what the current environment supports, independent of what the Fed does next.
Mortgages: Priced Off Treasuries, Not the Fed
A new 30-year fixed mortgage is not priced directly off the fed funds rate at all. Instead, mortgage lenders price it as a spread over the 10-year Treasury yield. That spread reflects origination costs, lender margin, and the credit and prepayment risk embedded in mortgage-backed securities, per research from the Federal Reserve Bank of Richmond and Fannie Mae. That distinction is the single most misunderstood part of the interest-rate system for most households.
Mortgage rates move on where investors expect rates to head over the next decade, not on the Fed's most recent decision. Because of that, they can move before a Fed meeting, after it, or even in the opposite direction. Freddie Mac's Primary Mortgage Market Survey put the average 30-year fixed rate at 6.95% for the week of September 17, 2026. That was up from 6.76% the week before, a roughly 20-month high reached the same week the Fed raised its own policy rate.
A Worked Example: +25 Basis Points on a New $400,000 Mortgage
Consider a new $400,000, 30-year fixed mortgage at that 6.95% average rate. It carries a monthly principal-and-interest payment of about $2,647.79. If the mortgage rate itself rises by 25 basis points to 7.20%, the same loan's monthly payment rises to about $2,715.14, a difference of roughly $67.35 a month. Held for the full 30-year term, that gap totals about $24,246 in additional payments.
That example illustrates the size of a 25 basis point move in the mortgage market. It is not a guaranteed effect of a Fed meeting. A new mortgage rate can move by more than 25 basis points, less than 25 basis points, or in the opposite direction of a Fed decision. It is set by the 10-year Treasury market, not by the Federal Open Market Committee.
Why Mortgage Rates Can Rise Even When the Fed Cuts
The clearest illustration of this decoupling happened around the Fed's September 2024 cutting cycle. Mortgage rates rose even as the Fed lowered its policy rate, because Treasury-market expectations about future growth and inflation moved independently of that one decision. An existing fixed-rate mortgage is entirely unaffected by any of this. Once a borrower locks a 30-year fixed rate, that rate does not change for the life of the loan, regardless of what the Fed or the Treasury market does afterward.
Auto Loans, HELOCs and the Loans That Do Move
New auto loans are priced off shorter-term Treasury yields plus a credit spread set at origination. Like mortgages, an existing auto loan is fixed once it is signed. Average new-car loan APRs stood at 6.35% in the second quarter of 2026, per Experian's State of the Automotive Finance Market. The rate a given household actually receives depends heavily on credit quality, ranging from roughly 4.41% for excellent-credit borrowers to roughly 16.11% for poor-credit borrowers in the same data.
A smaller group of household borrowing products does track the Fed in something close to real time. A home equity line of credit, or HELOC, is typically contracted as Prime plus a margin. It usually adjusts within about one statement cycle of a Fed move, the same mechanism that moves credit card APRs.
An adjustable-rate mortgage does not follow the Fed's calendar directly. It resets only on its own scheduled adjustment date, tied to an index such as SOFR, so a given ARM can lag or lead any specific FOMC decision depending on where it sits in its cycle. Private variable-rate student loans move with a market index plus a margin as well. Federal student loans, by contrast, remain fixed for the life of the loan and are unaffected by any Fed decision.
The Fed's Rate Path, 2022-2026
The Fed's target range has moved through three distinct phases since early 2022. The full sequence explains where today's 3.75% to 4.00% range came from. The table below lists every policy move over that period.
| Date (effective) | Move | New target range |
|---|---|---|
| Mar 17, 2022 | +25 bps | 0.25%–0.50% |
| May 5, 2022 | +50 bps | 0.75%–1.00% |
| Jun 16, 2022 | +75 bps | 1.50%–1.75% |
| Jul 28, 2022 | +75 bps | 2.25%–2.50% |
| Sep 22, 2022 | +75 bps | 3.00%–3.25% |
| Nov 3, 2022 | +75 bps | 3.75%–4.00% |
| Dec 15, 2022 | +50 bps | 4.25%–4.50% |
| Feb 2, 2023 | +25 bps | 4.50%–4.75% |
| Mar 23, 2023 | +25 bps | 4.75%–5.00% |
| May 4, 2023 | +25 bps | 5.00%–5.25% |
| Jul 27, 2023 | +25 bps | 5.25%–5.50% |
| Sep 19, 2024 | -50 bps | 4.75%–5.00% |
| Nov 8, 2024 | -25 bps | 4.50%–4.75% |
| Dec 19, 2024 | -25 bps | 4.25%–4.50% |
| Sep 18, 2025 | -25 bps | 4.00%–4.25% |
| Oct 30, 2025 | -25 bps | 3.75%–4.00% |
| Dec 11, 2025 | -25 bps | 3.50%–3.75% |
| Sep 17, 2026 | +25 bps | 3.75%–4.00% |
Three phases stand out. An 11-move hiking cycle from March 2022 to July 2023 added 525 basis points, taking the range from near zero to 5.25%–5.50%. A six-move easing cycle from September 2024 through December 2025 then cut 175 basis points, bringing the range down to 3.50%–3.75%. September 2026 marked the first hike since that easing cycle ended: a single 25 basis point move back up to 3.75%–4.00%. Readers who want the rate path kept current beyond this article can follow it at fed.money365.market, which tracks each FOMC decision as it happens.
What the Fed Is Actually Responding To
The Federal Reserve operates under a dual mandate from Congress: keep inflation stable, and support maximum sustainable employment. Its September 16, 2026 statement explained the decision to raise the target range. It said "inflation remains elevated" relative to the Committee's 2% goal, while describing economic activity as expanding at a solid pace and job gains as keeping pace with the size of the workforce. That combination of above-target inflation alongside a resilient labor market is what the Committee weighs at every meeting.
The FOMC meets eight times a year to review this same balance of evidence. Two meetings remain on the 2026 calendar: October 27-28 and December 8-9. This article does not attempt to predict what either meeting will produce, since the Fed's own guidance depends on data that has not yet arrived. What matters for a household is understanding the two forces the Committee weighs, not guessing its next move.
The transmission mechanics covered in this guide describe what a rate change does to a household's own loans and deposits. A parallel set of effects runs through the stock and bond markets. That side of the same decision is covered separately in how Fed policy moves stocks and portfolios, for readers who want the investing angle.
What This Means for Your Household Budget
Putting the pieces together, a single Fed decision produces very different outcomes, depending on which part of a household's balance sheet it touches. A cardholder carrying a revolving balance feels a rate change within one or two billing cycles, almost regardless of which way the Fed moves. A homeowner with an existing fixed-rate mortgage feels nothing at all, since that rate was locked at origination and is immune to every later Fed decision.
A saver's outcome depends less on the Fed than on which bank holds the money. Ten thousand dollars sitting in an account earning the FDIC's national average of 0.38% APY generates about $38 a year in interest. The same ten thousand dollars in an online high-yield account paying an illustrative 4.00% APY generates about $400 a year, a difference of $362 on an identical balance. That gap exists mainly because banks vary widely in how much of a Fed rate change they pass through to depositors, not because of the size of any one policy decision.
The practical takeaway is that a household's exposure to Fed policy is not one number, but a set of separate exposures. Each loan or account follows its own reference rate, at its own speed. Understanding which of those categories a given balance falls into explains a household's next statement far better than reacting to headline coverage of a single Fed meeting.
Frequently Asked Questions
Does the Fed directly set mortgage rates?
No. The Fed sets the fed funds rate, but 30-year fixed mortgage rates are priced off the 10-year Treasury yield plus a spread. That means they can move before, after, or even opposite to a Fed decision.
What is the difference between the federal funds rate and the Prime rate?
The federal funds rate is the rate the Fed targets for overnight bank lending. The Prime rate is a separate benchmark banks use for consumer loans, conventionally set at the fed funds upper bound plus three percentage points.
How much does a 0.25% Fed rate change cost on a credit card balance?
On a $5,000 balance moving from a 22.15% to a 22.40% APR, the added interest cost is about $1.04 a month. Carried for a full year, that adds up to roughly $12.50.
Why did my savings account rate barely move after a Fed hike?
Banks typically pass through only 15% to 25% of a Fed rate change to savings yields, a pattern researchers call deposit beta. Banks also tend to raise savings rates more slowly than they cut them.
Does my existing fixed-rate mortgage change when the Fed changes rates?
No. A fixed-rate mortgage locks in its rate at origination for the life of the loan. No subsequent Fed decision, or any other market move, changes that rate afterward.
What is a basis point?
A basis point is one-hundredth of one percentage point, so 100 basis points equal 1%. A "25 basis point move" is the same thing as a 0.25 percentage point change.