Interest Rate
An interest rate is the price of borrowing money; central banks set short-term policy rates, which ripple through bonds, currencies and stocks.
Interest rates are often called the most important price in finance. They set what it costs to borrow, what savers earn, and how much future profits are worth today. Central banks move their policy rates to steer inflation and growth, and every rate decision — or even a hint of one — can move currencies, bonds and stock markets. This entry explains how rates work, how different assets respond, and how traders follow rate expectations.
- Category
- Fundamentals and Macroeconomics
- Reading time
- 4 min
- Also called
- Interest rates, Policy rate, Base rate
- Updated
Interest rates in plain words
Borrow $1,000 at 5% a year, and you pay $50 a year in interest. Higher rates make borrowing more expensive and saving more attractive; lower rates do the opposite.
A central bank sets a short-term policy rate.1 Banks, bond markets and lenders build their own rates on top of it. See Central Bank and Federal Reserve.
How traders follow interest rates, step by step
Know the meeting dates
Central-bank decisions come on a published schedule.2 See Federal Open Market Committee.
Watch what is priced in
Futures and bond yields show what the market already expects.
Trade the surprise
A widely expected change often moves prices little; a surprise moves them a lot.
Listen to guidance
Statements about future decisions can matter more than today’s change.
Follow the data
Inflation and jobs reports change rate expectations. See Inflation.
Map it to your market
Currencies, bonds and rate-sensitive stocks react most.
Worked examples
Example 1 — Bond prices move opposite to rates
BondsA bond pays $40 a year on $1,000 (4%). New bonds now pay 5%.
| Old bond’s fixed coupon | $40 a year |
| What buyers now demand | 5% |
| Old bond’s price | Falls below $1,000 |
When rates rise, existing bonds with lower coupons lose value.3 See Yield to Maturity.
Example 2 — A surprise hike
SurpriseMarkets expect rates to stay at 3.0%. The central bank raises them to 3.25%.
| Home currency | Often rises |
| Bond yields | Rise |
| Stocks | Often fall |
The surprise, not the size of the move, drives the reaction.
Example 3 — Valuing future profits
ValuationA company expects $100 of profit in 10 years. What is it worth today at 2% vs. 5% discount rates?
| At 2% | $100 ÷ 1.02¹⁰ ≈ $82 |
| At 5% | $100 ÷ 1.05¹⁰ ≈ $61 |
Higher rates shrink the present value of distant profits, which is why growth stocks are rate-sensitive.
Typical reactions to higher-than-expected rates
| Aspect | Typical reaction | Why |
|---|---|---|
| Bonds | Prices fall | Existing coupons look less attractive |
| Currency | Often rises | Higher returns attract capital |
| Growth stocks | Often fall | Future profits are discounted more |
| Banks | Mixed | Lending margins can widen |
Why interest rates matter to traders
Currency trading
Rate differences between countries drive exchange rates. See Carry Trade.
Event risk
Rate decisions are major scheduled events.
Financing costs
Margin and overnight funding follow rates. See Margin.
Valuation
Rates feed into what investors pay for future profits.
Advantages and disadvantages
Advantages
- Decisions come on a known schedule.
- Expectations are visible in market prices.
- A clear link to many asset classes.
Disadvantages
- Reactions depend on expectations and wording.
- Effects on the economy arrive with long delays.
- Relationships between assets shift over time.
- Decision days bring sharp, two-way moves.
Going deeper
Read as far as you need. Each level builds on the one before it.
Nominal and real rates
Beginner
The real interest rate is roughly the nominal rate minus inflation. A 5% rate with 4% inflation is only about 1% in real terms. See Real Yield.
The yield curve
Intermediate
Rates for different maturities form the yield curve. When short-term rates rise above long-term rates, the curve is inverted — a situation often watched as a possible warning of slower growth.
Balance-sheet policy
Advanced
Central banks can also influence longer-term rates by buying or selling bonds. See Quantitative Easing and Tightening.
Common mistakes
Ignoring what is priced in
An expected hike can lead to a rally.
Skipping the statement
Guidance often matters more than the decision.
Assuming stocks always fall on hikes
Context and expectations matter.
Forgetting financing costs
Leveraged positions cost more when rates rise.
Check your understanding
Test yourself before moving on. Each answer comes with an explanation.
Key points to remember
- Interest rates are the price of borrowing money.
- Central banks set short-term policy rates to steer inflation.
- Bond prices move opposite to rates.
- Markets react to surprises and guidance, not just the decision.
- Higher rates reduce the present value of future profits.
Frequently asked questions
Why do higher interest rates often hurt stocks?
Why does a currency often rise when rates rise?
What does “priced in” mean?
Further learning
- Inflation
What rate decisions are trying to control.
- Fundamental Analysis
Where rates fit into analysing markets.
- Margin
How rates affect the cost of borrowing to trade.
- Hedging
Protecting positions around rate decisions.
Sources
This article is written in our own words. The sources below support the specific facts, rules and figures marked with a number in the text. Links open the original publisher’s page.
- European Central Bank. What is monetary policy? (opens in a new tab) Checked .
- Federal Reserve Board. Meeting calendars and information (FOMC) (opens in a new tab) Checked .
- Investor.gov (SEC). Investor Bulletin: Fixed Income Investments — When Interest Rates Go Up, Prices of Fixed-Rate Bonds Fall (opens in a new tab) Checked .
Educational content, not financial advice. Examples use hypothetical prices and simplified costs; actual fees, margin rules and regulations vary by broker, market and country. We are not affiliated with any publisher linked above. Last reviewed . Report an error or request a source credit.