Tier 2 · Essentials · Forex · Module FX.2
Interest rates and central banks
Why interest-rate expectations drive currencies, how central banks set policy, and how to read hawkish and dovish shifts.
Lesson 1 of 2 · 7 min read
If you had to pick one force that moves currencies over weeks and months, it would be interest rates — and, more precisely, what the market expects central banks to do with them. Technical analysis tells you where price might react. Rate expectations often explain why a currency has been trending in the first place. This lesson gives you a working model of how central banks think and how their decisions flow through to the pairs you trade.
What you'll learn
- Why interest rates attract or repel capital, and how that moves exchange rates
- Who the major central banks are and what they're trying to achieve
- The difference between the rate level and rate expectations
- How to read hawkish and dovish language
- How interest-rate differentials show up in your overnight swap
1. Why interest rates move currencies
Money flows toward the best available return for a given level of risk. When a country's interest rates rise — or are expected to rise — holding that currency (in deposits, bonds, and other assets) becomes more attractive. Investors need to buy the currency to buy those assets, which supports it.
The reverse also holds: when rates fall or are expected to fall, the currency tends to lose appeal.
The key word is relative. A currency pair compares two economies, so what matters is the difference between the two central banks' paths.
| Situation | Typical pressure on EUR/USD |
|---|---|
| Fed expected to raise rates, ECB on hold | Down (USD supported) |
| ECB expected to raise rates, Fed cutting | Up (EUR supported) |
| Both moving the same way at the same pace | Little rate-driven pressure |
2. The major central banks
| Central bank | Currency | Policy committee | Main goal |
|---|---|---|---|
| Federal Reserve (Fed) | USD | FOMC — 8 scheduled meetings a year | Dual mandate: maximum employment and stable prices (2% inflation target) |
| European Central Bank (ECB) | EUR | Governing Council — policy meetings about every six weeks | Price stability (2% inflation target over the medium term) |
| Bank of England (BoE) | GBP | Monetary Policy Committee — 8 meetings a year | Price stability (2% inflation target) |
| Bank of Japan (BoJ) | JPY | Policy Board — 8 meetings a year | Price stability (2% inflation target) |
| Swiss National Bank (SNB) | CHF | Quarterly assessments | Price stability; also watches the franc's strength |
| Reserve Bank of Australia (RBA) | AUD | Monetary Policy Board | Price stability and full employment |
| Bank of Canada (BoC) | CAD | Governing Council — 8 scheduled decisions a year | 2% inflation target |
| Reserve Bank of New Zealand (RBNZ) | NZD | Monetary Policy Committee | Price stability (inflation target band) |
Meeting schedules are published well in advance — check each bank's website or an economic calendar for exact dates.
Tools central banks use
- Policy rate — the headline interest rate
- Forward guidance — signalling what they are likely to do next
- Balance sheet policy — buying or selling bonds (quantitative easing or tightening)
- Occasionally, direct intervention in currency markets — for example to slow a sharp fall in their currency
3. Level vs expectations: why "good news" can drop a currency
Markets are forward-looking. By the time a central bank announces a decision, the most likely outcome is usually already priced in — reflected in the exchange rate through interest-rate futures and bond yields.
So the currency often reacts to the difference between what happened and what was expected:
| Market expected | Central bank did | Typical reaction |
|---|---|---|
| A 0.25% hike | A 0.25% hike, said little new | Muted — already priced in |
| A 0.25% hike | A 0.50% hike | Currency tends to strengthen |
| A 0.25% hike | A 0.25% hike but signalled it may be the last | Currency can weaken — the future path is lower than expected |
| No change | A surprise cut | Currency tends to weaken sharply |
Worked example
(Illustrative.) The market fully expects the Fed to raise rates by 0.25%. The Fed does exactly that — but the statement and press conference signal that further hikes are unlikely.
- The decision matched expectations.
- The path of future rates is now lower than the market had assumed.
- USD weakens; EUR/USD rises — on a day the Fed raised rates.
This is why professionals listen to the statement, the projections, and the press conference, not just the headline number.
4. Hawkish vs dovish
Two words you'll hear constantly:
- Hawkish — leaning toward higher rates or tighter policy to fight inflation. Usually supportive for the currency.
- Dovish — leaning toward lower rates or looser policy to support growth and jobs. Usually negative for the currency.
Phrases that often read hawkish: "inflation remains too high", "further tightening may be appropriate", "we will stay the course", "upside risks to inflation".
Phrases that often read dovish: "inflation is moving toward target", "risks are more balanced", "we can be patient", "monitoring the effect on the labour market".
A shift in tone — a hawkish bank sounding slightly less hawkish — often matters more than the tone itself.
5. Rate differentials and your swap
Interest-rate differences also show up directly in your account through the overnight swap (see Spread, slippage, liquidity).
- Holding a position long the higher-yielding currency and short the lower-yielding one can earn a positive swap (before the broker's markup).
- Holding the opposite position usually pays a swap every night.
The strategy of deliberately holding high-yield vs low-yield currencies to earn this difference is called the carry trade. It can work for long periods, but it tends to unwind sharply when markets panic and money rushes back into safe havens — so it carries real risk.
Common beginner mistakes
- Trading the headline rate decision without knowing what was expected.
- Assuming higher rates always strengthen a currency, regardless of why rates are rising.
- Looking at one central bank instead of the difference between two.
- Ignoring the press conference, where the tone often moves price more than the decision.
- Holding carry positions without a stop, forgetting they can unwind violently.
Key terms
| Term | Meaning |
|---|---|
| Policy rate | The headline interest rate set by a central bank |
| Rate differential | The difference between two countries' interest rates or expected rates |
| Priced in | Already reflected in the price because the market expected it |
| Forward guidance | A central bank's signals about its future policy |
| Hawkish / dovish | Leaning toward tighter / looser policy |
| Quantitative easing / tightening | Central-bank bond buying / reduction of those holdings |
| Carry trade | Holding higher-yielding vs lower-yielding currencies to earn the rate difference |
Practice
- Find the current policy rate and the date of the next meeting for the Fed, ECB, and BoE.
- For the next Fed meeting, look up what the market is pricing (for example on CME FedWatch). What would count as a hawkish surprise? A dovish one?
- Read the most recent statement from one central bank. Highlight three phrases and label each hawkish or dovish.
- On your demo platform, find the swap long and swap short for USD/JPY and EUR/USD. Which direction earns, and which pays?
Quick recap
- Money flows toward higher expected returns — rate expectations are a major driver of currency trends.
- What matters is the difference between two central banks, and expectations versus outcomes.
- Currencies often react to surprises and to changes in the expected path of rates, not just the decision.
- Hawkish usually supports a currency; dovish usually weighs on it — and shifts in tone matter most.
- Rate differentials also appear in your overnight swap.
Educational content only — not financial advice. Trading involves substantial risk of loss. Practise on a demo account before risking real money.
