How Inflation Works (and How It Affects Your Savings)

Inflation is the general rise in prices over time, which means each dollar buys a little less than it used to. In the United States, consumer prices rose 3.7% over the 12 months ending September 2026, according to the Consumer Price Index.

A little inflation is normal, and even considered healthy. But it quietly reduces the value of cash, which is why understanding it matters for every saver.

How inflation is measured

The most widely quoted measure is the Consumer Price Index (CPI), published every month by the U.S. Bureau of Labor Statistics (BLS). The BLS tracks the prices of a large “basket” of goods and services that urban households buy (food, housing, transportation, medical care, clothing, recreation and more) and reports how much the cost of that basket has changed.

When you hear “inflation was 3% last year,” it usually means the CPI was 3% higher than it was 12 months earlier.

The Federal Reserve targets inflation of 2% per year over the long run, measured by a related index called the PCE price index. It sees that level as consistent with stable prices and a healthy economy.

What causes inflation?

Economists usually point to a few main drivers:

• Demand-pull: when people and businesses want to buy more than the economy can produce, prices rise.
• Cost-push: when costs like energy, raw materials or wages go up, businesses pass some of those costs to customers.
• Expectations: if everyone expects prices to rise, workers ask for higher wages and businesses raise prices in advance, which can make inflation self-reinforcing.
• Money and credit: low interest rates and easy credit can fuel spending, which pushes prices up.

How inflation affects your money

Cash loses buying power

If your money sits in an account earning 0.5% while prices rise 3%, you’re losing about 2.5% of your buying power every year. Over a decade, that adds up to a meaningful loss, even though your account balance never went down.

The “real” interest rate is what counts

Your real return is roughly your interest rate minus inflation. Right now, the 3-month Treasury bill rate is 4.09% and annual CPI inflation is 3.7%. The difference between the two is a rough gauge of whether safe savings are currently keeping up with prices.

Borrowers can benefit

Inflation isn’t bad for everyone. If you have a fixed-rate mortgage, you repay it with dollars that are worth less over time, while your payment stays the same.

Inflation over the long run

Prices compound just like interest does. Even “normal” inflation of 2–3% per year roughly halves the buying power of a dollar over 25–35 years. Use the calculator below to see how much prices have changed between any two years since 1913, the first year of the official CPI.

How to protect your savings from inflation

1. Don’t hold more idle cash than you need. Keep an emergency fund, but make it earn a competitive rate.
2. Compare savings rates with inflation. High-yield savings accounts and Treasury bills can help cash keep pace. See T-Bills vs. high-yield savings.
3. Consider inflation-protected options. U.S. Series I savings bonds and Treasury Inflation-Protected Securities (TIPS) are designed to adjust with the CPI.
4. Think long-term for long-term goals. Over long periods, diversified investments have historically outpaced inflation, though with ups and downs along the way.

Why your personal inflation rate may differ

The CPI is an average. Renters in expensive cities, families paying for childcare, or people with high medical costs may experience higher inflation than the headline number. People who own their home outright and drive little may experience less.

Key takeaway: Inflation is a slow, invisible tax on cash. The goal isn’t to beat it every single year, but to make sure your savings aren’t steadily falling behind.

This content is for educational purposes only and isn't financial, tax or investment advice. Rates change daily; confirm current terms with your bank, broker or TreasuryDirect before making decisions. See our full disclaimer.