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World risk · Finance and markets

Japan steps into the currency market again to buy yen

The test Between 3 Nov 2026 and 3 Nov 2027, Japan's Ministry of Finance reports yen-buying foreign-exchange intervention above zero for any period in its monthly releases.

Not under way · Confidence: medium · Reviewed 3 Nov 2026 · Scores from 1 to 10

This page answers: What could happen, how it is scored, and who is exposed?

Using this page
  1. Read the two scores: Likelihood and Impact are kept apart.
  2. Check what is happening, each fact with its source.
  3. Use the calendar for the dates to watch.

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Likelihood
5Elevated steady this month
Impact
3Low steady this month
Breadth4
Depth3
Duration3
Hard to substitute2
Canada pointNot added0

Impact is the average of the four parts, rounded, plus one point when Canada is directly hit on two or more channels, up to 10.

Two separate scales from 1 to 10. Strature never multiplies or merges them.

What changed

Dated, newest first

  1. USD/JPY about 158.7 on 3 Nov 2026; Finance Minister Katayama ready to act on excessive or disorderly moves, 2 Nov (data firm summary) [5]
  2. BoJ Monetary Policy Meeting 17-18 Dec 2026 [8]
  3. BoJ kept the call rate at around 1.25% on 30 Oct 2026, 8-1; Takata proposed 1.5% [6]
  4. Intervention ¥0 for 29 Sep-28 Oct 2026 (published 30 Oct) [4]
  5. Reuters poll 13-19 Oct: 54 of 78 economists expect a rise to 1.5% this quarter; yen about 4% stronger than its 2026 low near 164 [7]

Why it matters

Japan sold dollars to buy ¥11,734.9bn worth of yen on three days between 30 Apr and 6 May 2026, and spent nothing in the month to 28 Oct. The yen was near 158.7 to the dollar on 3 Nov, a data firm reports. The Bank of Japan held its rate at 1.25% on 30 Oct, and most economists polled by Reuters expect a rise in December.

Why Likelihood 5 Recurring event (April-May 2026): not below 3. Pushes: a weak yen; repeated warnings. Brakes: a likely December rate rise (Reuters poll); yen stronger than its 2026 low; no action in October. No cited odds: at most 6; an open contest, 5.

The other facts on file (2)
  • Yen-buying, dollar-selling intervention on 30 Apr (¥6,278.7bn), 4 May (¥780.2bn) and 6 May 2026 (¥4,675.9bn) [3] (6 May 2026)
  • Intervention total ¥11,734.9bn for 28 Apr-27 May 2026 [2] (27 May 2026)

Where it sits

JAPANNORTH KOREASOUTH KOREA11. Japan steps into the currency market again to buy yen: Low impact · possible (placed at the country)1 Japan stepsinto the currency marketagain to buy yenLow impact · possibleJAPAN BUYS YEN AGAIN0500 kmat 38°NMap data: Natural Earth (public domain).
JAPANNORTH KOREA11. Japan steps into the currency market again to buy yen: Low impact · possible (placed at the country)1 Japan buys yenagainJAPAN BUYS YEN AGAIN0500 kmat 38°NMap data: Natural Earth (public domain).

How it spreads

Sample, no data on file. No cited flows by country on file for this risk.

If

Between 3 Nov 2026 and 3 Nov 2027, Japan's Ministry of Finance reports yen-buying foreign-exchange intervention above zero for any period in its monthly releases.

Not under way

Channels 3 on the card

  1. CanadaNo Canadian loss sourced.
  2. Finance and marketsIntervention sells US dollar reserves for yen [3] and can move USD/JPY sharply on the day.
  3. TradeA weaker yen raises Japan's bill for oil and LNG priced in dollars.

Sectors 1

  • Banks and insurers

Countries 2

Who is exposed

No figure on file: Japan, United States.

Sectors
Banks and insurers

Three scenarios and their signposts

  1. S1

    Line held

    Words and a December rate rise keep the yen stronger than 160.

  2. S2

    Intervention

    The yen weakens past 160 and the ministry buys yen.

  3. S3

    Strong yen

    US rate cuts lift the yen and no action is needed.

The signposts of each scenario
PathSignpost
S1a Bank of Japan rise on 18 Dec 2026
S2a non-zero figure in a monthly release
S3USD/JPY below 150

No probability is given for the three paths.

Dates to watch

Calendar

The dates to watch

A dot is a day, a bar a month or a year; a hollow mark is tentative. The line marks today.

  1. Nov 2026 Monthly intervention release (period to late November) [1] Tentative · Strature date
  2. 18 Dec 2026 Bank of Japan policy decision [8] Declared · Outside event

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SourceStrature world-risk card; the dates cite the sources below.
Exhibit R-3 · JAPAN · strature.net

The other side

Most economists polled expect a rate rise this quarter [7]; a rise would ease pressure on the yen without intervention. The yen is about 4% stronger than its 2026 low [7].

Connected in Strature

Sources

8 sources, numbered as the text cites them

  1. Foreign Exchange Intervention Operations. Ministry of Finance, Japan · 30 Oct 2026 · Official · confidence high · retrieved 3 Nov 2026
  2. Foreign Exchange Intervention Operations (April 28, 2026 - May 27, 2026). Ministry of Finance, Japan · 29 May 2026 · Official · confidence high · retrieved 3 Nov 2026
  3. Foreign Exchange Intervention Operations (April - June 2026). Ministry of Finance, Japan · 7 Aug 2026 · Official · confidence high · retrieved 3 Nov 2026
  4. Foreign Exchange Intervention Operations (September 29, 2026 - October 28, 2026). Ministry of Finance, Japan · 30 Oct 2026 · Official · confidence high · retrieved 3 Nov 2026
  5. Japanese Yen. Trading Economics · 3 Nov 2026 · Industry · confidence low · retrieved 3 Nov 2026
  6. Statement on Monetary Policy. Bank of Japan · 30 Oct 2026 · Official · confidence high · retrieved 3 Nov 2026
  7. BOJ to raise rates to 1.50% in December, sticking to quarterly pace: Reuters poll. GV Wire (Reuters) · 20 Oct 2026 · News · confidence medium · retrieved 3 Nov 2026
  8. Monetary Policy Meetings: schedule. Bank of Japan · 2026-11 · Official · confidence high · retrieved 3 Nov 2026

Reviewed 3 Nov 2026 · version 1 · last change: first review · All risks