Reviewed 11 August 2026 · Sourced from the Federal Reserve, the CFPB and Regulation Z
An interest rate is the price of money, quoted as a percentage per year. Borrow, and it is what you pay for the use of someone else's money. Save or lend, and it is what you are paid for the use of yours.
It prices the money and nothing else. Required fees sit outside it, which is why the APR on the same loan is usually the bigger number. The rate is the sticker on the money. The APR is the sticker on the deal.
- A rate prices the money by itself. Fees are excluded, which is why a mortgage's APR is normally higher than its interest rate — and why the two are usually identical on a credit card.
- Every rate is built from the same four parts: what the money costs the lender, how long it is tied up, how likely you are to repay, and the lender's own costs and margin.
- Nominal is the number you are quoted. Real is that number after inflation. With the Consumer Price Index up 3.5% in the year to June 2026, a 4.00% savings rate was earning about half a percentage point of actual purchasing power.
- Fixed means a number in your contract. Variable means an index plus a fixed margin, and only the index moves. On most American credit cards that index is the prime rate.
- Simple interest is charged on the principal. Compounding charges interest on interest. That alone turns a 22.15% card into about 24.79% a year if you carry the balance.
- The same borrower on the same day is quoted wildly different rates on different products. That is not a contradiction. It is collateral, term and loss rates being priced one at a time.
What an interest rate actually is
Money has a price. That sounds strange the first time you hear it, because money is the thing we use to price everything else. But money you can use today is worth more than the same money a year from now, and an interest rate is simply how much more.
The plainest way to hold it: an interest rate is rent on money. Someone lets you use their money for a while. You pay for the time you had it. When the arrangement runs the other way — your savings sitting in a bank — the bank is renting money from you, and the rate is what it pays.
The Consumer Financial Protection Bureau defines it on a mortgage as "the cost you will pay each year to borrow the money, expressed as a percentage rate," and then adds the sentence that does all the real work: "It does not reflect fees or any other charges you may have to pay for the loan." That second sentence is the entire difference between an interest rate and an APR.
Three things follow from the definition, and each one catches people out.
A rate is a percentage, not a dollar amount
Ten percent on $500 and one percent on $5,000 cost exactly the same. The rate on its own tells you nothing about what you owe until you put a balance next to it. This is why "I got a great rate" is an incomplete sentence, and why the worst debt in a household is often not the one with the highest number attached.
A rate is per year unless it says otherwise
American consumer credit is quoted annually by law and by habit. But almost nothing actually charges annually. Cards charge daily. Mortgages charge monthly. The annual figure is a convention that exists so two offers can be compared. The number doing the actual work is the annual rate divided by the number of periods in the year.
A rate is not a payment
This is the expensive one. A payment is a rate, a balance and a term braided together, and a seller can move any of the three while you are watching only one. Stretch a car loan from sixty months to eighty-four and the payment falls, the total cost rises, and the rate never moved at all.
The rate you pay on a card and the rate you earn on savings are one idea seen from opposite ends. In August 2026 those ends are a long way apart. Commercial banks reported an average of 22.15% on credit card accounts assessed interest in the second quarter of 2026 (Federal Reserve G.19, released 7 August 2026), while the 1-month Treasury bill yielded 3.79% on 7 August (Federal Reserve H.15). That gap is not unfairness. It is the price of being an unsecured borrower instead of the United States government.
How a rate gets built
Nobody picks your rate out of the air, and nobody picks it off a chart either. A lender builds it, and it comes out of four questions.
Your rate = Funding cost + Term premium + Credit risk + Costs & marginThis is a way of reading a rate, not a form a lender fills in. No disclosure breaks a rate into these pieces. Every rate has all four inside it anyway.
1. What the money costs the lender
Banks do not lend their own money. They lend depositors' money and borrowed money, and both have a price. That price is anchored by the Federal Reserve's target range for the federal funds rate, which stood at 3.50% to 3.75% as of the Fed's July 2026 Monetary Policy Report, with the effective federal funds rate printing 3.63% every business day in the week ending 7 August 2026. When the Fed moves that range, every rate in the country feels it — but not all at the same speed, and not all by the same amount.
2. How long the money is tied up
Lending for thirty years is a different proposition from lending for thirty days, and the Treasury market prices that difference in public every afternoon. On 7 August 2026 the Fed's H.15 release showed 1-month Treasuries at 3.79%, 2-year at 4.19%, 10-year at 4.65% and 30-year at 5.19%. Same borrower — the safest one there is — and a spread of 1.40 percentage points from one month to thirty years, created by time alone.
3. How likely you are to repay
This is the part people take personally, and it is worth not doing that. A lender is not forming an opinion about your character. It is pricing a portfolio. If one borrower in fifty at a given credit tier stops paying, the rate charged to that whole tier has to carry the loss. Your credit score is the lender's shorthand for which tier to put you in, which is why improving it changes your price without changing one thing about the money you want to borrow.
4. What it costs to run the business, plus profit
Underwriting, servicing, collections, fraud losses, capital held against the loan, and a margin on top. Small loans carry roughly the same fixed costs as large ones spread across far less balance, which is one reason small-dollar credit is expensive nearly everywhere it exists.
Why one person gets four different rates in the same week
Put those four together and the spread stops looking arbitrary. Here is American consumer credit in August 2026, four ways, every figure from a federal source:
| Product | Rate | Typical term | Secured by | Source |
|---|---|---|---|---|
| 30-year fixed mortgage | 6.69% | 30 years | The house | Freddie Mac survey, week ending 6 Aug 2026 |
| Federal Direct undergraduate loan | 6.52% | 10+ years | Nothing | U.S. Dept. of Education, 2026–27 award year |
| New car loan, 60 months | 7.14% | 5 years | The car | Federal Reserve G.19, Q2 2026 |
| Personal loan, 24 months | 11.86% | 2 years | Nothing | Federal Reserve G.19, Q2 2026 |
| Credit card, accounts assessed interest | 22.15% | No maturity | Nothing | Federal Reserve G.19, Q2 2026 |
Read down the "secured by" column and most of the spread explains itself. A mortgage lender who is not repaid can take the house and sell it. A card issuer who is not repaid can send letters. Then read the term column, which cuts the other way: the mortgage is by far the longest loan on the list and still one of the cheapest, because collateral outweighs time.
The card carries one thing none of the others do. It is a line you can draw on whenever you like, with no maturity date, which the issuer has to be ready to fund whether you use it or not. You are not only borrowing. You are being handed an option, and options are never free.
The student loan is the odd one out and worth a second look. It is unsecured, it is long, and it is still the cheapest rate on the list — because Congress sets it by statute rather than a risk model. The Department of Education fixes it once a year at the high yield of the final 10-year Treasury note auction before 1 June, and it is then fixed for the life of that loan. Rates are set by whoever has the power to set them, and that is not always a market.
One caveat on the table. The G.19 figures are published as annual percentage rates and the mortgage figure is a survey note rate before points, so the five numbers are not calculated identically. They are close enough to show what collateral and term do to a price. They are not close enough to shop with.
Nominal vs real: what inflation does to a rate
Every rate you will ever be quoted is a nominal rate. It describes what happens to the number of dollars. It says nothing about what those dollars will buy by the time you get them.
Take the quoted number, subtract inflation, and what is left is the real rate — the change in purchasing power rather than the change in dollars. Dollars are the unit. Purchasing power is the point.
Real rate ≈ Nominal rate − Inflation rateNamed for the American economist Irving Fisher. Accurate enough at ordinary rates; it drifts once rates or inflation get large.
1 + Real = ( 1 + Nominal ) ÷ ( 1 + Inflation )At 4.00% nominal against 3.5% inflation the shortcut says 0.50% and the exact version says 0.48%. Use the shortcut in your head and the exact one on paper.
You hold $10,000 in an account paying 4.00%. The Consumer Price Index rose 3.5% over the twelve months to June 2026 (Bureau of Labor Statistics, released 14 July 2026).
Four hundred dollars showed up in the account. About forty-eight of them were real. The other $350 replaced purchasing power that had already left. Nothing was stolen and the bank did nothing wrong — the account did roughly what it needed to do to stand still.
The same arithmetic runs the other way on debt, and it is the one place inflation quietly helps a borrower. A fixed 6.69% mortgage during a 3.5% inflation year is costing about 3.2% in real terms. The payment never changes. The dollars used to make it are worth a little less every year. That is the whole reason a long fixed-rate debt behaves differently from a variable one, and it only works if the rate is genuinely fixed.
The market publishes its own answer, free
You do not have to guess at the real rate over a long horizon, because the Treasury sells two versions of the same bond. On 7 August 2026 the Fed's H.15 release showed the 10-year nominal Treasury at 4.65% and the 10-year inflation-indexed Treasury at 2.40%. Subtract, and the gap is 2.25 percentage points.
That gap is what the bond market was collectively willing to pay to be protected from inflation over ten years. Two useful things fall out of it. The 2.40% is a real yield, so it is roughly the purchasing power a ten-year Treasury buyer expected to gain. And the 2.25% is not a promise — it is a price, and prices are wrong all the time. It is still the most honest inflation expectation available to a member of the public, it updates every business day, and it costs nothing to look up.
Real rates are the reason "my money is safe in savings" and "my money is keeping up" are separate claims. A federally insured account cannot lose dollars. It can lose purchasing power every year for a decade while the balance goes up on every statement. Both facts are true at once, and only one of them shows up on the statement.
Fixed vs variable
A fixed rate is a number in your contract. A variable rate is a rule for producing a number.
Your rate = Index + MarginIndex = a published rate outside the lender's control, most often the prime rate · Margin = a fixed number of percentage points assigned to you at approval, which does not change
The CFPB puts it plainly. A variable APR "changes with the index interest rate, such as the prime rate published in the Wall Street Journal," while a fixed APR "does not fluctuate with changes to an index." Your agreement names the index, states the margin, and says how often the rate resets.
The margin is the part worth finding, and almost nobody has. It is where your credit file shows up. It is fixed for the life of the account. And it is the entire difference between two people watching the same index move. Prime plus 9 and prime plus 20 are the same product with the same index and an eleven-point gap in what it costs to carry a balance.
On a card, fixed means the issuer has to notify you before changing the rate, not that it cannot. Regulation Z generally requires 45 days' written notice before a significant change in account terms, including a rate increase. But that requirement does not apply to a variable rate rising because its index rose — section 1026.9(c)(2)(v)(C) exempts an increase that happens "according to operation of an index that is not under the control of the creditor and is available to the general public." So the honest summary runs backwards from how it sounds: a fixed card rate can change with warning, and a variable card rate can change without it.
Regulation Z does put a hard limit on the variable side, and it is a genuine protection. Section 1026.55 bars a card issuer from raising your APR except in listed circumstances, and the variable-rate exception is narrow: the rate must vary with an index outside the issuer's control and available to the public, and the increase must be caused by an increase in that index. Your margin cannot quietly widen. The calculation method cannot be changed to manufacture a rise. The index moves or your rate does not.
Which products are which
- Almost always fixed — 30-year and 15-year mortgages, federal student loans (fixed for the life of the loan by statute), most auto loans, most personal loans, and home equity loans. The CFPB notes that a home equity loan "usually has a fixed interest rate – one that will not change."
- Almost always variable — credit cards, home equity lines of credit, and business and personal lines of credit. The CFPB notes that HELOCs "usually have adjustable interest rates and the payment will vary depending on the outstanding balance."
- It depends, and the paperwork tells you — adjustable-rate mortgages and private student loans. Both exist in fixed and variable forms, and if there is an index the note names it.
The trade is straightforward. Fixed usually costs a little more up front and buys certainty. Variable usually starts lower and hands the interest rate risk to you. Neither is the right answer in general. They are two different distributions of the same unknown, and which one suits a household depends on facts a web page cannot see.
Simple interest vs compounding
Two loans at the same rate can cost different amounts, and the reason is how often the interest gets added to what you owe.
Interest = Principal × Rate × TimeInterest is charged on the original balance only. It never earns interest on itself.
Balance = Principal × ( 1 + Rate ÷ n ) ^ ( n × t )n = compounding periods per year · t = years. Interest is added to the balance, and the next round is charged against the larger number.
American consumer credit is overwhelmingly the second kind. The CFPB describes how a card works: "Many issuers calculate the interest you owe daily, based on the average daily balance," and "the interest charged daily is called the daily periodic rate." Daily. Which means yesterday's interest is part of today's balance, three hundred and sixty-five times a year.
Daily periodic rate = Annual rate ÷ 365The figure actually doing the work behind the monthly interest line on a card statement.
You carry $5,000 for a year at 22.15% — the average rate commercial banks reported on credit card accounts assessed interest in the second quarter of 2026 (Federal Reserve G.19).
Nothing changed about the rate. Nothing changed about the balance. The extra $132 exists entirely because the interest was added 365 times instead of once. That is why the quoted rate on a card and the real cost of a card are different numbers, and the gap widens with every year the balance survives.
Compounding is symmetrical, and it is the only force in personal finance that works as hard for you as it does against you. The same mechanism that turns 22.15% into 24.79% on a balance turns a savings rate into a slightly larger effective one, which is precisely what APY measures and what APR leaves out. The difference is that on a card the compounding happens whether you are paying attention or not, and on savings it only happens if you leave the money alone.
Divide any card APR by 365 and multiply by your balance. That is what the debt costs you per day, in dollars, and it is the most useful arithmetic on this page. At 22.15% on $5,000 it is $3.03 a day. Put that next to a minimum payment before deciding whether the minimum is a plan.
Interest rate vs APR vs APY
Three numbers describe the price of money and they are not interchangeable. Ten seconds spent on the difference changes what you are actually comparing.
| Measure | Includes fees? | Includes compounding? | Quoted on |
|---|---|---|---|
| Interest rate | No | No | The money itself — a note, a rate sheet, a card agreement |
| APR | Yes | No | Money you borrow — loans, cards, mortgages |
| APY | No | Yes | Money you hold — savings, CDs, money markets |
The interest rate is the narrowest of the three, and that is both its virtue and its weakness. It prices exactly one thing. Because it prices exactly one thing, it is also the easiest number to make look good: a lender can move your rate down by charging an origination fee or selling you discount points, and the rate really does fall while the actual cost of the deal rises.
That is the precise problem APR was invented to solve. Under the Truth in Lending Act and Regulation Z, a lender has to disclose the APR before you commit, calculated the same way every lender calculates it, with certain required fees folded in. The CFPB's summary is that APR "reflects the interest rate, any points, mortgage broker fees, and other charges that you pay to get the loan," which is "why your APR is usually higher than your interest rate."
The practical rule is short:
- Comparing two mortgage offers? Compare APRs. The rate alone hides what you hand over at closing.
- Comparing two credit cards? The APR and the interest rate are usually the same number, because a card's annual fee is not in the APR. Compare APRs, then compare annual fees separately.
- Comparing two savings accounts? Compare APYs. Never compare an APY to an APR — the comparison fails before it starts.
The interest rate prices the money. The APR prices the deal. The APY prices what compounding does. The number a lender leads with is almost never the one that describes what you will pay, and the full breakdown lives on the APR page.
Where the rate is not the thing that matters
Very few people lose money by misunderstanding what a rate is. They lose it in five specific places.
Shopping the payment instead of the rate. A longer term always produces a smaller payment and a bigger total. Stretch a $30,000 car loan from sixty months to eighty-four at the same 7.14% and the payment drops by about $141 a month while the total interest rises by about $2,450. Nothing about the rate changed. The only variable you were watching got moved.
Assuming a rate cut reaches you. When the Federal Reserve lowers its target range, fixed loans you already hold do not move. Not by a dollar. A fixed contract was fixed when you signed it. Cuts reach new borrowing and variable balances, and nothing else. The reverse is the good news: when rates rise, your existing fixed mortgage does not.
Comparing a rate on one product to a rate on another. A 7% personal loan and a 7% mortgage are not the same offer, because they run for different lengths against different collateral toward different totals. A rate is only comparable inside a category, for the same term, quoted in the same week.
Watching the rate and ignoring the balance. A rate multiplies a balance, and the multiplication is what costs money. Twenty-two percent on $800 costs about $176 a year. Six percent on $40,000 costs $2,400. The high rate is the smaller problem. Ranking your debts by rate and ranking them by dollars can point in opposite directions, and it is worth knowing which question you are answering before you pick an order.
Not knowing your own rates. The most common failure and the cheapest to fix. Every card statement carries the APR. Every mortgage note carries the rate. Most people asked to name the rate on their own credit card cannot do it, and you cannot make a decision about a number you have never looked at.
On a mortgage, the rate you are quoted on Tuesday is a rate that existed on Tuesday. It becomes yours when it is locked in writing, for a stated number of days, and not one minute before. Rate locks are ordinary and free at most lenders. An unlocked quote is a weather report, and treating it as a commitment is how people arrive at closing surprised.
What trips people up
- Treating the interest rate and the APR as the same number. On a mortgage they almost never are. The gap between them is the cleanest available read on how much you are paying in fees, and it is printed on the Loan Estimate for free.
- Believing the Federal Reserve sets your rate. The Fed sets a target range for what banks charge each other overnight. Prime, card rates and mortgage rates are all set by lenders and markets, with the Fed's decision as one input among several. The 30-year mortgage rate has moved in the opposite direction from the Fed's target more than once, and will again.
- Comparing a rate to an APY. Different measures containing different things. Put like against like, or the number you reach is meaningless.
- Reading a promotional rate as the rate. A 0% introductory offer has a revert rate and a revert date, both of them in the disclosure. The revert rate is the real rate on that account, and the date is the only thing standing between the best product in your wallet and one of the worst.
- Assuming a lower rate always wins. Not if it was bought with points you will not hold the loan long enough to recover. Not if it comes attached to a term you cannot comfortably carry. Not if the fee that produced it is bigger than the interest it saves.
- Forgetting inflation exists on the savings side. A rate that looks like a gain in dollars can be a loss in purchasing power. The real rate is the one that tells you whether you finished the year ahead.
- Thinking the rate is the negotiation. On many loans the fees are more negotiable than the rate, and the fees are where the APR gap comes from. Asking a lender to remove or reduce a fee is an ordinary request.
Frequently asked questions
What is an interest rate in simple terms?
An interest rate is the price of using someone else's money, written as a percentage per year. If you borrow, it is what you pay for the time you have the money. If you save, it is what the bank pays you for exactly the same reason. It prices the money by itself, which is why fees sit outside it. On its own a rate tells you nothing useful. It only becomes a dollar amount once you put a balance and a length of time next to it.
What is the difference between an interest rate and an APR?
The interest rate is the price of the money alone. The APR is that rate plus certain required fees, spread across the life of the loan and expressed as a yearly percentage. The Consumer Financial Protection Bureau describes the interest rate as the yearly cost to borrow that does not reflect fees, and the APR as a broader measure including points, broker fees and other charges you pay to get the loan. On a mortgage the APR is normally higher. On most credit cards the two are identical, because a card's annual fee is not part of the APR.
What is the difference between a nominal and a real interest rate?
Nominal is the rate you are quoted. Real is that rate after inflation, and it is the one that tells you whether your purchasing power went up. Subtracting the inflation rate from the nominal rate gets you close enough for most purposes. With the Consumer Price Index up 3.5 percent over the twelve months to June 2026, an account paying 4 percent was earning roughly half a percentage point in real terms. The dollars grew by four hundred on ten thousand. What those dollars could buy barely moved.
Does the Federal Reserve set my interest rate?
No. The Federal Reserve sets a target range for the federal funds rate, which is what banks charge each other for overnight loans. As of the July 2026 Monetary Policy Report that range was 3.5 to 3.75 percent. Your rate is set by your lender, using the Fed's decision as one input alongside its own funding cost, the length of the loan, what it could seize if you stopped paying, and your credit file. Fixed loans you already hold do not change at all when the Fed moves.
Why is my credit card rate so much higher than my mortgage rate?
Because a mortgage is secured and a card is not. If a mortgage stops being paid, the lender can take the house and sell it, so its losses are capped. If a card stops being paid, the issuer has nothing to take. A card also has no maturity date and must be funded whether you draw on it or not, which is an option the issuer is giving you. In the second quarter of 2026 the Federal Reserve reported an average of 22.15 percent on card accounts assessed interest, while Freddie Mac put 30-year fixed mortgages at 6.69 percent in early August.
What is a good interest rate?
Only comparable against the same product, for the same term, quoted in the same week. A rate that is ordinary on a mortgage would be extraordinary on a credit card. The Federal Reserve publishes the honest yardsticks free: the G.19 release carries average commercial bank rates on cards, car loans and personal loans, and the H.15 release carries Treasury yields and the prime rate. Look up the average for the product you are shopping and judge your quote against that, rather than against a number someone said online.
Related terms
Where to go next
- Put a real rate against a real term in the mortgage calculator or the auto loan calculator — both free, no account.
- Watch what compounding does across years in the compound interest calculator.
- Sort your balances by rate and see the payoff order change in the debt payoff calculator.
- See where rates come from in Markets · Economic, which tracks the Fed, the yield curve and inflation from live federal data.
- Work through debt triage in Stage 2 · Stabilize, then browse every definition in Learn the Lingo.
- Board of Governors of the Federal Reserve System, H.15 Selected Interest Rates, released 10 August 2026 (Treasury constant maturities and inflation-indexed yields for 7 August 2026; effective federal funds rate 3.63%).
- Board of Governors of the Federal Reserve System, Consumer Credit — G.19, released 7 August 2026 (Q2 2026 commercial bank rates: credit cards 20.94% all accounts and 22.15% on accounts assessed interest, 60-month new car 7.14%, 24-month personal loan 11.86%).
- Board of Governors of the Federal Reserve System, Monetary Policy Report, 10 July 2026 (federal funds target range of 3-1/2 to 3-3/4 percent, unchanged since the start of 2026).
- Freddie Mac Primary Mortgage Market Survey, via FRED series MORTGAGE30US (30-year fixed average 6.69%, week ending 6 August 2026).
- U.S. Bureau of Labor Statistics, Consumer Price Index news release, released 14 July 2026 (CPI-U up 3.5% over the twelve months to June 2026).
- Consumer Financial Protection Bureau, What is the difference between a mortgage interest rate and an APR? (definitions of interest rate and APR).
- Consumer Financial Protection Bureau, How is my credit card interest calculated? (daily periodic rate and average daily balance).
- Consumer Financial Protection Bureau, What is a variable interest rate? (variable APR moves with an index such as the prime rate).
- Consumer Financial Protection Bureau, Regulation Z § 1026.9 and § 1026.55 (45-day notice, the index exception, and limits on raising a variable APR).
- U.S. Department of Education, Federal Student Aid, Interest Rates for Federal Direct Loans, 1 July 2026 to 30 June 2027 (6.52% undergraduate, set off the 10-year Treasury note auction and fixed for the life of the loan).
The figures on this page are checked against the source that publishes them, and dated. Published rates move after the release named above — the linked source always carries the current number. This page explains a term; it does not recommend a product.