Key takeaways
- Higher relative rates tend to support a currency by attracting capital, but expectations and guidance usually matter more than the rate level.
- 'Priced in' means the market has already moved on the likely outcome; the surprise drives the reaction.
- Carry is the interest-rate gap earned through swaps; it can be wiped out quickly by an adverse exchange-rate move.
- Statements, projections and press conferences are often more market-moving than the decision.
- Treat decision-day volatility as a cost and a risk, not a guarantee of direction.
Currencies are priced by money flows, and few things steer money flows as strongly as the return on holding a currency. Central banks set the baseline for that return through interest rates, and they shape expectations through everything they say. This guide explains the mechanics without trying to forecast any bank's next move.
The basic link between rates and currencies
A higher interest rate on a currency makes deposits and government bonds in that currency more rewarding, which tends to attract international capital. To buy those assets, investors first buy the currency, and that demand supports its value. A lower rate does the reverse.
That is the textbook picture, and it holds up as a general tendency. But in practice, markets rarely react to the rate itself. They react to how the rate compares with what they expected, and to what the central bank signals about the future.
The central bank toolkit
| Tool | What it does | Typical effect on the currency |
|---|---|---|
| Policy rate | Sets the benchmark short-term borrowing cost | Higher rates tend to support; cuts tend to weigh |
| Forward guidance | Signals the likely path of future decisions | Often moves prices more than the decision itself |
| Asset purchases and balance-sheet runoff | Adds or removes liquidity and long-term yields | Purchases tend to weaken; runoff can support |
| Foreign-exchange intervention | Direct buying or selling of the currency, or verbal warnings | Can cause sharp short-term moves |
| Inflation and growth targets | Define what the bank is trying to achieve | Set the context in which data is judged |
The main banks to know are the Federal Reserve (US), the European Central Bank, the Bank of England, the Bank of Japan, the Swiss National Bank, the Reserve Bank of Australia, the Bank of Canada and the Reserve Bank of New Zealand. Each publishes a calendar of decision dates months ahead.
What 'priced in' means
Futures and swap markets give a running estimate of what traders expect from each central bank. By decision day, the likely outcome is usually already reflected in the exchange rate. The surprise is the difference between what happens and what was expected.
Illustrative scenario: markets assign a 70% chance to a quarter-point cut. The bank cuts by 0.25 percentage points, as expected, but says it sees no need for further cuts soon. The cut was largely priced in; the new guidance is the surprise, so the currency may rise even though rates fell.
| Outcome vs expectations | Typical label | Common first reaction |
|---|---|---|
| Tougher on inflation or rates than expected | Hawkish surprise | Currency often rises |
| Softer than expected | Dovish surprise | Currency often falls |
| Exactly as expected, neutral tone | In line | Smaller move, often followed by reversal as the press conference unfolds |
These are tendencies, not rules. A hawkish message delivered because the economy is in trouble can worry markets, and the sign of the reaction can flip within minutes.
Carry: getting paid for holding the higher-yielding currency
If you hold a currency with a higher interest rate against one with a lower rate, you earn the difference, minus broker charges. Traders call this carry. In retail trading it appears as a daily swap credit or charge on positions held through the rollover time.
Illustrative maths: suppose you are long 100,000 Australian dollars against yen, with policy rates of 4.0% for AUD and 0.5% for JPY. The differential is 3.5%, about 3,500 AUD a year, or roughly 9.6 AUD a day, before the broker's markup. If AUD/JPY is at 100, one pip on this size is worth about 10 AUD, so a 350-pip move against you wipes out a full year of that carry.
That asymmetry is why carry strategies tend to do well in calm markets and suffer sharp reversals when risk appetite collapses and funding currencies surge. Retail swap rates also include the broker's spread on top of the rate gap, so the sign and size of the credit you actually receive may be lower than the theory suggests, and may be a charge in either direction.
Reading a central bank decision day
- Know what is expected. Check the consensus for the decision and what the market implies. A decision is only a surprise relative to that expectation.Tip: Futures-implied probabilities are published by many data services.
- Read the statement text for changes. Compare it with the previous statement. A deleted or added sentence is often the news.
- Check the projections. Some banks release rate or inflation forecasts alongside the decision. Shifts from last time matter more than the levels.
- Follow the press conference. The tone of the chair's remarks often moves markets after the headline, in either direction.
- Wait for the dust to settle. Spreads are wide and prices whipsaw in the first minutes. Judging the move afterwards is easier than predicting it in real time.
Frequently asked questions
Does a rate hike always strengthen a currency?
No. If the hike was fully expected, or if it signals economic trouble, or the bank sounds less hawkish than hoped, the currency can fall. Direction depends on the surprise and on the context.
What is the difference between nominal and real interest rates?
A nominal rate is the headline figure. A real rate subtracts inflation. Investors often compare real yields because they show what return is left after prices rise.
Do central banks target exchange rates?
Most large central banks target inflation and employment and let their currency float. Some smaller economies manage or peg their exchange rate, and others intervene occasionally.
Where do I find decision dates?
Each central bank publishes its meeting calendar on its own website, and economic calendars aggregate them with consensus forecasts.