What Is Inflation?
Inflation is the general rise in prices across the economy over time. When prices rise 3% in a year, a basket of goods and services that cost $100 a year ago costs about $103 today. Your dollars have not changed, but each one buys a little less.
It is about the overall price level, not one product. Some prices rise faster than average, some rise more slowly, and a few fall. The rate is the average change across everything a typical household buys.
A little inflation is normal in a growing economy. Problems start when it runs well above or below the level people expect, because that makes it hard for households and businesses to plan.
How Inflation Is Measured in the US
The best-known measure is the Consumer Price Index (CPI), published every month by the US Bureau of Labor Statistics (BLS). The CPI tracks how the prices that urban consumers pay for a set basket of goods and services change over time.5 The basket covers food, housing, transport, medical care, clothing, recreation and more.
The headline figure is the change in the CPI over the last 12 months. Economists also watch the “core” figure, which leaves out food and energy because those prices jump around a lot. The core figure gives a clearer view of the underlying trend.
The latest figures
| Measure | Latest reading | What it tells you |
|---|---|---|
| CPI, all items (12 months to September 2026) | 3.7%1 | How much the overall cost of living rose in a year |
| Core CPI, excluding food and energy | 2.6%1 | The underlying trend without volatile prices |
| Federal Reserve inflation goal | 2%3 | The rate the Fed aims for over the longer run |
| Federal funds target range | 3.75% to 4.00%4 | The Fed’s main interest rate, raised in September 2026 |
The gap between the headline and core figures in 2026 shows how much food and energy prices are pushing inflation up. The BLS publishes each new CPI report around the middle of the following month.1
What Causes Inflation?
Prices rise across the economy for three main reasons, and they often happen together.
| Type | What happens | Everyday example |
|---|---|---|
| Demand-pull | People and businesses want to buy more than the economy can produce, so sellers raise prices. | Strong spending after a period of saving pushes up prices for travel and restaurants. |
| Cost-push | The cost of making things rises, and businesses pass it on. | Higher fuel prices raise the cost of transporting almost every product. |
| Built-in (wage-price) | People expect prices to keep rising, so they ask for higher pay, and businesses raise prices to cover it. | Workers seek raises to keep up with last year’s price rises. |
The amount of money and credit in the economy also matters. When borrowing is cheap and spending power grows faster than the supply of goods and services, prices tend to rise. That is why central banks use interest rates to influence inflation.
A Simple Example of Inflation at Work
Imagine a cup of coffee that costs $5.00 today, in an illustration where prices rise 3% a year. Next year it costs about $5.15. After 10 years, the same cup costs about $6.72.
The same effect works on savings. If you keep $1,000 in cash that earns nothing, it will buy what about $744 buys today after 10 years of 3% inflation. After 30 years, its buying power falls to about $412.
How Much Inflation Is Normal?
The Federal Reserve aims for inflation of 2% a year over the longer run. It measures this goal with the price index for personal consumption expenditures, a measure closely related to the CPI.3
The Fed explains that inflation at this level helps households and businesses plan with confidence. A small positive rate also leaves room for interest rates to be cut in a downturn, and it lowers the risk of falling prices, known as deflation.3
Price rises can run far above that goal. Consumer prices rose 9.1% in the year to June 2022, the largest 12-month increase in 40 years.2 The rate then fell, but in 2026 it has picked up again, to 3.7% in September.1
How Inflation Affects Your Money
Inflation touches almost every part of your finances, but not always in the same direction. Who wins and who loses depends on whether your money is in cash, debt, investments or wages.
Savings and cash
Money in a checking account that pays little or no interest loses buying power every year. A savings account helps only if its interest rate keeps up with prices. Earning 1% while prices rise 3% means losing about 2% of buying power a year.
Wages
What matters is your real wage: your pay after allowing for rising prices. A 3% raise in a year when prices rose 3.7% is a small pay cut in real terms. A 5% raise in the same year is a real gain.
Debt
Fixed-rate borrowers can benefit, because they repay with dollars that are worth less than when they borrowed. But new borrowing usually gets more expensive, because lenders and the Fed raise rates to fight inflation. Variable-rate debts, such as most credit cards, can rise quickly.
Investments
Over long periods, shares in companies have tended to grow faster than prices, because businesses can raise their prices. Bonds with fixed payments lose value when prices rise faster than expected. Our explainer on index funds covers a simple, low-cost way to invest for the long term.
See What Inflation Does to Your Money
Enter an amount and an inflation rate to see future prices and how much buying power your cash loses each year.
Try the Inflation Calculator →Why the Fed Raises Interest Rates
Higher interest rates make borrowing more expensive and saving more rewarding, which cools spending and slows price rises. When prices rise faster than its 2% goal, the Federal Reserve can raise its main policy rate, the federal funds rate.
In September 2026 the Fed raised its target range to 3.75% to 4.00%.4 That change feeds through to rates on mortgages, car loans, credit cards and savings accounts over the following weeks and months. Read our explainer on why interest rates are rising for what it means for your loans and savings.
Rate rises work with a delay. It can take a year or more for the full effect to show up in prices, which is why the Fed watches forecasts as well as the latest data.
Your Personal Inflation Rate Is Different
The CPI is an average, and your own spending is not average. If you rent, drive a lot or spend a large share of your budget on food, your costs may rise faster or slower than the headline rate.
A household that drives long distances feels fuel price rises much more than someone who works from home. A homeowner with a fixed-rate mortgage is shielded from rising rents. Looking at where your money goes each month shows which price changes really affect you.
Inflation, Deflation and Disinflation
Three similar words describe three different situations.
| Term | Meaning | Example |
|---|---|---|
| Inflation | Prices are rising. | Prices up 3.7% over a year. |
| Disinflation | Prices are still rising, but more slowly than before. | Inflation falls from 5% to 3%. |
| Deflation | Prices are falling on average. | Prices down 1% over a year. |
Deflation can sound like good news, but falling prices can lead people to delay purchases. That can slow the economy and push up unemployment, which is one reason central banks aim for low, positive price rises instead.
What Is Hyperinflation?
Hyperinflation is extremely rapid inflation, where prices rise so fast that money quickly loses its value. It is rare, and it usually follows a severe crisis, such as a government printing money to pay its bills while the economy is collapsing.
During hyperinflation, people try to spend their money as soon as they are paid, because it will buy less tomorrow. Savings in the local currency can be wiped out, and people often switch to a more stable foreign currency for everyday trade.
Prices rising a few percent a year is a very different thing. It erodes buying power slowly, which is why planning and earning a decent real return are usually enough to deal with it.
How to Protect Your Money From Inflation
The basic rule is to aim for returns above the inflation rate on money you will not need for a while. Different time horizons call for different tools.
- Emergency money: keep it safe and easy to reach, but look for an account whose interest rate keeps up with prices.
- Medium-term goals: compare savings rates regularly, because rates change after Fed decisions.
- Long-term goals: diversified investments such as broad index funds have historically had a better chance of beating rising prices over many years, with ups and downs along the way.
- Debt: pay down variable-rate debt such as credit cards first, because its cost tends to rise with interest rates.
Growth on growth is what lets savings keep ahead of rising prices. Our explainer on compound interest shows how that works over time.
The Rule of 72 for Inflation
Divide 72 by the yearly rate of price rises to estimate how many years it takes for prices to double. At 2% a year, prices double in about 36 years. At 3%, about 24 years. At 5%, about 14 years.
The same shortcut tells you how fast the buying power of cash halves. It is a quick way to see why even modest-sounding rates matter over a working life.
Looking Back: Comparing Past and Present Prices
To compare a price from a past year with today, use the actual CPI data rather than a rough rate. The BLS runs a free CPI inflation calculator that converts dollars between any two months using the real index values.6
For planning ahead, a steady assumed rate is easier to work with. Our inflation calculator shows future prices and buying power for any rate and number of years.
How the CPI Is Put Together
The CPI is built from prices collected for thousands of goods and services, weighted by how much households spend on each. Housing costs carry a large weight because they take a big share of most budgets. Items people rarely buy carry a small weight.
The BLS publishes indexes for the whole country, for regions and for many individual categories, such as food at home, new vehicles or medical care.5 That detail lets you see which prices are driving the headline figure in any month. When the news reports that “energy pushed inflation up”, it is reading these category indexes.
The basket is updated over time as spending habits change. New products enter it, and the weights shift as households spend more on some things and less on others.
Inflation and Your Taxes
Rising prices also shape the tax system, because many tax thresholds rise with prices each year. The IRS adjusts the federal income tax brackets and the standard deduction for inflation every year.7 For 2026, the standard deduction for a single filer is $16,100.
Without these adjustments, a raise that only kept up with prices could push you into a higher bracket even though you were no better off. Our explainer on how tax brackets work explains the brackets and why they rise.
Interest on savings is a different story. Tax is charged on the full interest you earn, not on the part above rising prices. When prices rise fast, your after-tax real return on cash can easily be negative.
Inflation and Long-Term Planning
Plans that cover many years should always allow for rising prices. A goal that costs $50,000 today will cost more by the time you reach it. In an illustration where prices rise 3% a year, it would cost about $67,200 in 10 years.
Retirement planning shows the effect most clearly. Someone who needs $40,000 a year in today’s money will need far more than that in 20 or 30 years. That is why long-term plans usually work in today’s dollars and assume a return above inflation, rather than ignoring price rises altogether.
Our savings goal calculator works in today’s dollars. Raise the target a little if the goal is many years away, to leave room for higher prices.
Common Myths About Inflation
A few common beliefs about inflation do not hold up.
- “Lower inflation means prices are falling.” No. Lower inflation means prices are rising more slowly. Prices only fall during deflation.
- “Inflation only matters for big purchases.” It affects everyday costs such as food, rent and fuel, which take a large share of most budgets.
- “Keeping cash is always the safe choice.” Cash is safe from market falls, but not from rising prices. Over long periods, low-interest cash loses buying power.
- “The headline rate is my rate.” Your own rate depends on what you buy, so it can be higher or lower than the CPI.
Key Terms Explained
- CPI (Consumer Price Index): a monthly US measure of the prices urban consumers pay for a basket of goods and services.
- Core inflation: the rate excluding food and energy prices.
- Real return: an investment’s return after subtracting inflation.
- Purchasing power: how much a sum of money can buy.
- Federal funds rate: the Federal Reserve’s main policy interest rate.
The Bottom Line
Inflation means each dollar buys a little less over time. Watch the CPI for the overall trend, but judge your savings, pay and debts against your own costs. Keep emergency money safe, look for returns above inflation for longer-term money, and remember that small yearly rates add up over decades. For more, browse our money explainers.
Inflation also erodes cash savings. Our explainer on emergency funds covers where to keep them.
Educational content: This article explains general principles. It isn't personal financial, tax or investment advice. Rules and rates change, so check official sources or speak to a qualified adviser before making decisions.
Frequently Asked Questions
Consumer prices rose 3.7% in the 12 months to September 2026, according to the Bureau of Labor Statistics. Core inflation, which excludes food and energy, was 2.6%.
Low, steady price rises are considered healthy, which is why the Federal Reserve aims for 2%. High or unpredictable price rises hurt savers and makes planning hard.
Mainly strong demand, rising costs such as energy, and expectations that push up wages and prices. The amount of money and credit in the economy also plays a part.
If your savings earn less interest than prices rise, their buying power falls each year. Comparing your interest rate with the CPI shows whether you are keeping up.
Higher rates make borrowing costlier and saving more rewarding, which slows spending. Slower spending eases the pressure on prices over time.
Inflation means prices are rising on average; deflation means they are falling. Deflation can lead people to delay spending, which can slow the economy.
Sources
- 1US Bureau of Labor Statistics: Consumer Price Index, September 2026 (released October 14, 2026)
- 2US Bureau of Labor Statistics: Consumer Prices Up 9.1 Percent Over the Year Ended June 2022
- 3Federal Reserve: Why Does the Federal Reserve Aim for Inflation of 2 Percent Over the Longer Run?
- 4Federal Reserve: Open Market Operations
- 5US Bureau of Labor Statistics: Consumer Price Index
- 6US Bureau of Labor Statistics: CPI Inflation Calculator
- 7Internal Revenue Service: IRS Releases Tax Inflation Adjustments for Tax Year 2026
Every figure in this article is checked against the sources above. How we research and fact-check →
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