An FX risk reversal is an options-market measure of skew: the difference in implied volatility between an out-of-the-money call and an out-of-the-money put on the same currency pair, typically at similar deltas and the same expiry. Traders read it as a rough gauge of whether the market is paying more to hedge upside or downside in that pair — not as a crystal ball for the spot print tomorrow.
This is options literacy for event weeks, distinct from spot-only explainers such as cable trading around Bank of England decisions and from vol-surface cousins discussed on earlier floors.
What the number is trying to say
If 25-delta risk reversals show calls richer than puts in volatility terms, dealers and desks often describe the skew as favouring upside hedges (or upside demand) in that quoting convention. The opposite skew favours downside hedges. Conventions on which side is “positive” vary by pair and by broker screen, so beginners must read the sign convention on their own platform before quoting a number in a chat.
Samuel & Co Trading’s assessment is that naming “skew versus spot direction” before an event prevents the classic mix-up of treating risk reversals as a spot buy/sell signal.
Why event weeks matter
Into FOMC, BoE or big CPI, implied volatility often rises and skew can shift as hedgers pay up for protection on one side of the distribution. A crowded one-way spot view sometimes shows up first in risk reversals and butterflies rather than in the spot mid. After the event, vol can crush while skew normalises — or skew can stay extreme if the path surprise was one-sided.
Risk reversal versus straddle
A straddle or at-the-money implied vol speaks to expected magnitude. A risk reversal speaks to asymmetry of that distribution. Both can be elevated into a meeting; only skew tells you which tail is more expensive. Educational readers jot both when available rather than staring at spot alone.
What a risk reversal does not prove
A call-over-put skew does not guarantee the currency will rally. A put-over-call skew does not guarantee a collapse. Skew can reflect hedging demand from corporates or real-money accounts that never intend to “be right” on direction. This article does not recommend buying or selling options or spot.
How UK beginners can use this
On a BoE or Fed morning, if your platform shows 25-delta risk reversals for GBP/USD or EUR/USD, note whether skew cheapened or richened protection on the sterling-downside side after the print. Compare that to whether spot and front-end yields agreed. Related process: common mistakes on central bank super weeks.
Common mix-ups
Do not confuse risk reversals with risk-off as a sentiment slogan. Do not confuse a 25-delta RR with a 10-delta RR — wings can tell a different story. Do not mix quoting conventions across pairs without checking the sign. Do not treat RR changes as a substitute for reading the statement and vote.
Putting it next to the tape
A clean habit: before the event, jot ATM vol and the 25-delta risk reversal. Afterward, mark whether spot, ATM vol and skew moved together or diverged. Divergence is often the educational lesson.
If you want a structured check on how you process event-week FX risk, a free traders assessment can highlight sizing and timing habits without turning this explainer into personal advice.
Tenor choice and the calendar
One-week and one-month risk reversals can disagree when the event sits inside one expiry but not the other. A meeting tomorrow may spike the short-dated skew while leaving three-month skew calmer. Educational readers match the RR tenor to the event horizon before declaring “the market is skewed.”
Cross-checks with spot and realised vol
If skew screams downside protection but spot barely moves and realised vol stays quiet after the print, the hedge may have been insurance that expired unused — still informative about positioning, not a failed prophecy. Skew is a price of tails, not a verdict on who was right.
Conclusion
An FX risk reversal summarises options skew — which tail is more expensive to hedge — and often shifts on central-bank and data weeks. UK beginners gain more from reading skew beside spot and ATM vol than from treating the RR as a directional tip. Educational framing only, not a forecast or trade recommendation.
