How to trade central bank decisions
Many new traders assume that a currency should rise after a rate hike and fall after a rate cut. In reality, financial markets react to how a central bank decision compares with what traders were already expecting.
A good example is today's Reserve Bank of New Zealand (RBNZ) monetary policy decision. The central bank raised interest rates, yet the New Zealand dollar weakened. Many new traders were surprised because they focused only on the rate hike itself.
However, the market was already fully expecting the increase. What weakened the NZD was the statement containing less hawkish language, and the new OCR projections remaining unchanged. Relative to expectations, the overall decision was more dovish than expected.
PREPARATION
Before trading a central bank decision, a trader must determine what the market is expecting. This can be done by checking interest rate expectations through short-term interest rate futures and overnight index swaps (OIS), which are influenced by economic data, central bank members' speeches/comments, and global macro events affecting the economy. And reading previews from major investment banks and research firms online to gauge the consensus. The most important question is not "What will the central bank do?" but rather "What does the market already expect the central bank to do?"
REFRESH THE PREVIOUS DECISION
Before the announcement, traders should carefully review the previous policy statement and macroeconomic projections. Markets compare the new communication with the previous one to identify changes in the statement language and macro forecasts.
Even small wording changes can influence market expectations. For example, in the July's statement, the RBNZ said that "future OCR decisions will depend on how incoming data, price-setting behaviour, and the strength of economic activity affect medium-term inflation pressures". Today, on the other hand, they changed it to "future policy decisions will depend on the Committee’s judgement of the balance of risks to medium-term inflation". In the former, there's a clear focus on data, while on the latter, the focus is on the Bank's judgement of the balance of risks. This is clearly less hawkish.
Moreover, in July, the meeting minutes attached to the statement said "the Committee agreed that while further OCR increases appear likely at upcoming meetings, their timing is highly uncertain". Today, they said "future policy will depend on the Committee’s judgement of the balance of risks to medium-term inflation. This approach allows the Committee to observe and assess the effects of reduced monetary stimulus". This sounds like there's less appetite for tightening.
FOCUS ON THE DEVIATIONS
When the decision is released, markets react to deviations from expectations rather than the rate decision itself. For example, if the market expects three rate hikes for the year, but the central bank signals fewer future hikes, the currency will fall. If the market expects no change in the future but policymakers hint at future tightening, the currency will rise. If the market expects three rate cuts next year and the central bank's projections imply only one, the reaction is likely to be hawkish. You get the idea. The key is to compare the announcement with what traders had already priced in beforehand.
I have already shown the deviations in the statement, but there was also a deviations in terms of future interest rate outlook. In fact, the market was pricing in 110 bps of tightening by the end of 2027 (implied rate 3.60%), while the RBNZ kept the OCR forecast unchanged at 3.15% for 2027. This is much less hawkish than market's pricing.
CONCLUSION
This is why currencies sometimes fall after a rate hike or rise after a rate cut. The market is constantly comparing the new information with existing expectations. Trading is fundamentally about expectations and surprises. The larger the gap between expectations and reality, the larger the potential market reaction as traders reprice the new information.
This article was written by Giuseppe Dellamotta at investinglive.com.提供 MainLink：Investinglive RSS Breaking News Feed
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