Why Interest Rates Go Up and Down

One day borrowing money feels cheap. A year later, the same loan costs twice as much. What changed? Interest rates. And behind every rate move is a story about inflation, employment, and the decisions of a few powerful people in a room.

Most people feel the effects of interest rate changes — in their mortgage payment, their savings account, their credit card bill — without fully understanding what drives them. That knowledge gap is expensive.

Interest rates are the price of borrowing money, set primarily by central banks to manage inflation and keep the economy growing at a healthy pace.

When the economy overheats, prices rise too fast and central banks push rates up to slow things down. When growth stalls, they cut rates to make borrowing cheaper and encourage spending. It's a balancing act — and getting it wrong has real consequences for millions of households. In this article, you will learn what interest rates actually are, who sets them and why, what pushes them higher or lower, and how changes ripple through your finances.

Key Takeaways

• Interest rates are set by central banks — primarily the Federal Reserve in the US — not by individual banks or markets alone.

• The Fed raises rates to fight inflation and cuts rates to stimulate a slowing economy.

• When the federal funds rate changes, mortgage rates, savings yields, and credit card APRs all shift in the same direction.

• Between 2022 and 2023, the Fed raised rates 11 times — one of the fastest tightening cycles in modern history — pushing the benchmark rate from near zero to over 5%.

Contents

1. What Interest Rates Actually Are

2. Who Sets Interest Rates — and How

3. What Makes Rates Go Up

4. What Makes Rates Go Down

5. How Rate Changes Affect Your Money

6. Frequently Asked Questions

7. Conclusion

What Interest Rates Actually Are

An interest rate is the cost of borrowing money, expressed as a percentage. If you borrow $1,000 at a 5% annual interest rate, you owe $50 in interest over the course of a year on top of repaying the original amount.

But there is not just one interest rate. There are dozens. Mortgage rates. Car loan rates. Credit card rates. Savings account rates. Treasury bond yields. They are all connected — but they start from one anchor: the federal funds rate, which is the rate American banks charge each other for overnight loans.

The Federal Reserve — the US central bank — sets a target range for this rate. Everything else flows from it. When the Fed moves its rate, banks adjust their own rates for consumers and businesses accordingly. Think of the fed funds rate as the root of a tree. The rest of the rates you encounter in daily life are branches.

💡 Quick Fact: The Federal Reserve was created in 1913 specifically to give the US a more stable financial system — including the power to influence borrowing costs across the entire economy.

Globally, each country has its own central bank doing the same job. The European Central Bank sets rates for the eurozone. The Bank of England sets rates for the UK. Their decisions move in parallel — and often in sync — with the Fed's.

Who Sets Interest Rates — and How

In the United States, the Federal Open Market Committee (FOMC) is the body responsible for setting the federal funds rate. It meets eight times per year — roughly every six weeks — to review economic data and vote on whether to raise rates, cut them, or leave them unchanged.

The FOMC is made up of 12 voting members: the seven members of the Federal Reserve Board of Governors plus five regional Fed presidents on a rotating basis. They study an enormous volume of data before each meeting: inflation readings, jobs reports, consumer spending, business investment, global economic conditions.

Their dual mandate from Congress is clear: keep prices stable and keep employment high. The challenge is that these two goals often pull in opposite directions.

📊 Key Stat: The Fed's inflation target is 2% per year — a level considered healthy enough to encourage spending without eroding purchasing power. When inflation ran above 9% in mid-2022, the Fed responded with the most aggressive rate-hiking cycle since the 1980s.

The committee does not just announce a number and walk away. Fed Chair Jerome Powell holds a press conference after each meeting, and markets — and mortgage lenders — react immediately to every word. The Fed's communication is almost as powerful as the rate decision itself, because it shapes expectations about future moves.

What Makes Rates Go Up

Interest rates rise when the economy is running too hot. The clearest signal of an overheating economy is inflation — prices rising faster than incomes, which erodes purchasing power for everyone.

Here is the mechanism: when the Fed raises its benchmark rate, it becomes more expensive for banks to borrow money. Banks pass that cost on to consumers and businesses through higher loan rates. Borrowing becomes costlier, so people and companies borrow less. Spending slows. Demand falls. Prices stop rising as fast. Inflation cools.

Several specific conditions push the Fed toward raising rates:

• High inflation — consumer prices rising well above the 2% target

• A very tight labour market — unemployment so low that wages surge, feeding further price increases

• Rapid GDP growth — an economy expanding so fast it risks overheating

• Asset price bubbles — housing or stock markets rising unsustainably

The 2022–2023 rate cycle is the most recent vivid example. Post-pandemic spending surges, supply chain disruptions, and energy price shocks sent US inflation to a 40-year high of 9.1% in June 2022. The Fed responded by raising rates 11 times in 16 months, lifting the benchmark from effectively 0% to a range of 5.25–5.50%. This is also explored in detail in How Inflation Affects the Stock Market: What Every Investor Needs to Know.

What Makes Rates Go Down

The opposite conditions call for rate cuts. When the economy slows sharply — when businesses stop hiring, consumers pull back on spending, or a recession looms — the Fed cuts rates to make borrowing cheaper and encourage activity.

Lower rates reduce the cost of mortgages, car loans, and business credit. Companies can borrow cheaply to invest and hire. Consumers feel less financial pressure. Spending picks up. Growth returns. The logic is the same as raising rates, just in reverse.

The most dramatic modern example was the COVID-19 pandemic. In March 2020, the Fed cut rates to near zero in an emergency move to prevent economic collapse as lockdowns shuttered businesses worldwide. The IMF estimated global GDP contracted by 3.5% in 2020 — the worst peacetime recession since the Great Depression — and ultra-low rates were a critical part of the policy response.

Rates also fall when:

• Unemployment rises sharply — job losses reduce consumer spending, requiring a stimulus

• Inflation falls below target — prices growing too slowly can signal weak demand

• Financial crises emerge — as seen in 2008, when the Fed slashed rates to prevent a banking collapse

• Global growth slows — external shocks can force domestic rate cuts to protect the economy

For investors, falling rates generally benefit bonds and growth stocks. For borrowers, they present an opportunity to lock in cheaper long-term debt. See also: Inflation vs Interest Rates Explained: How They Work Together.

How Rate Changes Affect Your Money

Interest rate decisions made in Washington have direct consequences for your household budget — often within weeks.

Mortgages

The 30-year fixed mortgage rate does not move in lockstep with the fed funds rate, but it correlates closely with 10-year US Treasury yields, which are heavily influenced by Fed policy expectations. Between early 2022 and late 2023, the average 30-year mortgage rate in the US jumped from around 3% to over 8% — the highest level in more than two decades — pricing millions of first-time buyers out of the market. If you're thinking through homeownership costs, How Much House Can You Actually Afford? breaks down the full calculation.

Savings accounts

Higher rates are good news for savers. When the Fed raises its benchmark, banks gradually increase the yields they offer on high-yield savings accounts and certificates of deposit. By mid-2023, many online banks were offering savings rates above 5% — a dramatic improvement for anyone holding cash after years of near-zero returns.

Credit cards and consumer loans

Credit card rates are typically variable and tied directly to the prime rate, which moves with the fed funds rate almost immediately. By 2023, the average US credit card APR had climbed above 21% — the highest on record — making existing balances significantly more expensive to carry.

US Federal Funds Rate: 2019–2024 — From Near-Zero to 5.25%

This line chart tracks how the US federal funds rate — the benchmark interest rate set by the Federal Reserve — changed from 2019 through 2024. It shows the dramatic rate cuts of 2020 in response to the pandemic, the extended period of near-zero rates through 2021, and the historic tightening cycle of 2022–2023 that took rates from 0.25% to 5.50%. The chart illustrates just how quickly interest rates can move and why those moves matter for mortgages, savings, and borrowing costs.

• In March 2020, the Fed cut rates from 1.75% to 0.25% in a single emergency move to fight the pandemic recession

• Rates held near 0% for two full years (2020–2021) — the longest period of near-zero rates since the 2008 financial crisis

• The Fed then raised rates 11 times between March 2022 and July 2023, reaching 5.25–5.50% — the highest level in 22 years

Frequently Asked Questions

Does the Federal Reserve set all interest rates in the US?

The Fed sets only the federal funds rate — the rate banks charge each other for overnight loans. But because all other rates are anchored to this, its decisions cascade across the economy. Mortgage lenders, credit card companies, and banks all adjust their rates based on where the fed funds rate is and where it is expected to go next.

How quickly do interest rate changes affect me?

Variable-rate products like credit cards and adjustable-rate mortgages change almost immediately after a Fed decision. Fixed-rate mortgages move more slowly, based on bond market expectations. Savings account rates at traditional banks often lag by weeks or months, while high-yield online savings accounts tend to adjust faster and more fully.

Can interest rates go negative?

Yes — and it has happened. Several countries including Japan, Switzerland, and Sweden have used negative interest rates, effectively charging banks to hold excess reserves in order to encourage lending. The US Federal Reserve has not gone negative, though it came close to zero during the 2008 crisis and again in 2020. Negative rates are a last-resort tool with significant economic risks.

Why do rising interest rates hurt the stock market?

Higher rates raise borrowing costs for companies, which cuts into profits. They also make bonds and savings accounts more attractive compared to stocks, pulling investment money away from equities. Additionally, higher rates reduce the present value of future earnings — a key driver of stock valuations, especially for growth companies. This relationship is explored in depth in How Inflation Affects the Stock Market: What Every Investor Needs to Know.

Conclusion

Interest rates go up and down for very specific, data-driven reasons. The Federal Reserve raises rates to cool inflation before it spirals out of control. It cuts rates to prevent recessions from deepening and to restore growth. The 2020–2024 cycle — from near zero, up to 5.50%, then back down — is one of the most dramatic demonstrations of this process in modern history.

Understanding the direction of interest rates helps you make smarter financial decisions: whether to lock in a fixed mortgage, move cash into a high-yield account, or think carefully about carrying a credit card balance.

• The federal funds rate is the anchor for nearly all other interest rates in the US economy

• Rates rise when inflation is too high; they fall when the economy needs support

• Every rate change affects your mortgage, savings, credit card, and investment returns — often within weeks

Sources

• International Monetary Fund — World Economic Outlook Reports

• US Bureau of Labor Statistics — Consumer Price Index (CPI) Data

• Federal Reserve — Selected Interest Rates (H.15 Statistical Release)