Reading Market-Implied Rate Probabilities: A Repeatable Method Before Central-Bank Decisions

Key takeaways

1. CME FedWatch showed an 82.8% chance that the Fed holds at 3.75%–4.00% on 27–28 October, while Bloomberg data put the hike probability at 17% (FXStreet; Bloomberg Technoz).

2. Convert any probability into basis points priced, because a 17% chance of a 25 basis-point move means only about 4 basis points are in the price.

3. Record the source and timestamp of every probability, compare it with economists and official guidance, then size the surprise for each outcome.

The development

Four central banks decide within eight business days. The Fed meets on 27–28 October, the RBNZ on 28 October, the Bank of Japan (BoJ) on 30 October and the Bank of England (BoE) on 5 November. Markets have already priced each decision.

On Tuesday 20 October, the CME FedWatch tool, as reported by FXStreet at 02:24 UTC, showed an 82.8% probability that the Fed keeps its 3.75%–4.00% target range in October, with expectations for a December hike near 93.6%. Bloomberg data cited by Bloomberg Technoz put the October hike probability at 17%, down from 20% a week earlier. CNBC cited 15% on 16 October. Brown Brothers Harriman notes that swaps price about 80% odds of a 25 basis-point RBNZ increase on 28 October, under 5% for a BoJ increase on 30 October and about 80% by 18 December (FXStreet). For the BoE, markets fully price four quarter-point rises by the end of next year (Reuters).

Market transmission

Currencies react to the gap between the decision and what was priced, not to the decision itself. If the market prices a 17% chance of a 25 basis-point Fed hike, about 4.25 basis points are priced (0.17 × 25). A hold would surprise by roughly 4 basis points; a hike would surprise by about 21. The dollar's likely reaction is therefore asymmetric, even though "hold" is the consensus outcome.

What to monitor next

• US housing data in the Fed's quiet period: September starts missed the poll median at a 1.221 million annual rate, while permits were in line (Census Bureau).

• New Zealand CPI on the evening of 21 October UTC, the main input before the RBNZ decision.

• UK CPI on Wednesday at 06:00 UTC, after Tuesday's labour data showed unemployment at 4.7% (ONS).

• Japan's national CPI on Friday 23 October, ahead of the BoJ meeting (FXStreet).

Reusable lesson

Use the same six steps before any decision.

1. Record the number, source and timestamp. On Tuesday, FXStreet's 82.8% hold and Bloomberg's 17% hike were near-identical readings taken at different times. Always compare like with like.

2. Convert to basis points priced. Multiply the probability by the size of the move. This turns a percentage into a quantity you can compare with the outcome.

3. Compare with economists and official guidance. In the Reuters poll, 54 of 63 economists expected a BoE increase in November. Fed Governor Waller said on 8 October that hikes "do not need to come at consecutive meetings" (Federal Reserve Board). Where pricing, surveys and guidance diverge, a surprise is more likely.

4. Map the surprise for each outcome. Write down the basis-point surprise for a hold, a 25 basis-point move and any larger move.

5. Re-check after each tier-1 release. Pricing can change by more in one data release than in a week of commentary.

6. Know the tool's limits. FedWatch-style tools usually assume 25 basis-point steps, and swaps and futures can give slightly different readings. Small gaps between sources are measurement noise, not news.

The method links the tape notes in this pack. Note 1 shows the kiwi trading on risk appetite while RBNZ pricing sits near 80%. Note 2 shows why UK pay data can move the BoE path. Note 3 shows how central-bank actions can replace market pricing as the main driver of a currency.

Invalidation and risk

Probabilities are not forecasts. They include risk premiums and can swing sharply after a single release. Low-probability outcomes do happen: the Fed raised rates in September after nine months on hold (Federal Reserve Board). CNBC notes that Chair Kevin Warsh has rejected traditional forward guidance, so pricing may be less anchored than in earlier cycles. Treat a probability as information about positioning, not as a direction.

Glossary

Implied probability: The chance of a policy move derived from futures or swap prices.

Overnight indexed swap (OIS): A derivative that exchanges a fixed rate for the average overnight rate, used to read expected policy rates.

Quiet period (blackout): The days before a policy meeting when officials avoid public comment on policy.

Sources

FXStreet (citing CME FedWatch and Brown Brothers Harriman) (2026-10-20): Japanese Yen flatlines near 158.50 as markets seek direction

Bloomberg Technoz (Bloomberg data) (2026-10-20): Rupiah Rebound, Menguat Terbatas ke Rp18.013/US$

CNBC (2026-10-16): Markets expect the Fed to hold rates in October. Kevin Warsh could surprise them

Federal Reserve Board (2026-10-08): Speech by Governor Waller on the economic outlook

Reuters (via Investing.com) (2026-10-15): BoE to raise rates to 4% in November, but economists narrowly expect hold from there

FXStreet (citing Brown Brothers Harriman) (2026-10-20): New Zealand Dollar holds steady above 0.5650 as PBOC holds Loan Prime Rates steady

US Census Bureau (2026-10-20): Monthly New Residential Construction, September 2026 (CB26-162). https://www.census.gov/construction/nrc/current/index.html

Disclaimer

This note is provided by the SummitFx Project for general education and market context only. It is not investment advice, not a solicitation to buy or sell any instrument, and not a personal recommendation. Foreign exchange and related markets are leveraged and can result in the loss of some or all of your capital. Figures are believed accurate at the time of research and may already be stale. Always verify live prices, official releases, and your own risk limits before acting. Past market behaviour does not determine future results.