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World risk · Finance and markets · Global debt & markets

The Hong Kong dollar hits the weak end of its band and the HKMA buys it

The test The HKMA's weak-side Convertibility Undertaking at HK$7.85 per US dollar is triggered, with the HKMA buying Hong Kong dollars from banks, at least once between 28 Oct 2026 and 31 Oct 2027, as reported by the HKMA.

Not under way · Confidence: medium · Reviewed 28 Oct 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
6Elevated steady this month
Impact
4Elevated steady this month
Breadth4
Depth2
Duration5
Hard to substitute4
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. HIBOR fixings 28 Oct 2026: overnight 2.54%, one-month 2.71%, three-month 3.22%, 12-month 3.96% [4]
  2. FOMC kept the target range at 3.75-4% on 28 Oct 2026, 10-2; two members dissented, preferring a quarter-point rise [14]
  3. Aggregate Balance HK$54.1bn on 21 Oct and HK$54.0bn on 28 Oct 2026 (HKMA) [7]
  4. USD/HKD high of 7.8487 on 21 Oct 2026 (low-confidence market site) [8]
  5. USD/HKD traded 7.8300-7.8380 in April-May 2026 and about 7.8460-7.8475 since mid-June; weak-side CU at 7.8500 [1]
  6. HKMA chief: a persisting rate gap will lead to further easing and could trigger the weak-side CU; timing hard to predict; the Fed may need to hike again in late 2026 to 1H 2027 [1]
Show 3 earlier changes
  1. HKMA Base Rate raised to 4.25% on 17 Sep 2026, first rise since July 2023 [6]
  2. Major banks kept best lending rates unchanged after the September Base Rate rise [13]
  3. FOMC raised the target range to 3.75-4% on 16 Sep 2026 [5]

Why it matters

The Hong Kong dollar has drifted to the weak end of its HK$7.75-7.85 band since mid-June 2026, trading at about 7.8460-7.8475 per US dollar, and the HKMA's chief executive said on 6 Oct that a lasting rate gap could lead to a triggering of the weak-side guarantee. Hong Kong interbank rates sit well below US rates after the Fed's rise of 16 Sep. The same carry trade led to 12 weak-side triggers between late June and mid-August 2025.

Why Likelihood 6 Pushes: HKMA chief says the rate gap will ease the currency further and could trigger the weak side [1]; Fed rise of 16 Sep 2026 [5]; HIBOR well below US rates [4].

Why Impact 4 Key price one-month HIBOR. Threshold case one weak-side trigger of about HK$9.42bn (US$1.2bn) as on 26 Jun 2025. For a single trigger, 3 would give a mean of 3.25 and an Impact of 3.

The other facts on file (3)
  • Weak-side CU triggered 12 times from late June to mid-August 2025; Aggregate Balance HK$173.4bn end-May to HK$54.1bn end-August 2025 [2] (31 Dec 2025)
  • HKMA bought HK$9.42bn on 26 Jun 2025, the first weak-side trigger since May 2023 [3] (26 Jun 2025)
  • The 2025 weak-side run took HK$119.95bn from 21 Jun to 8 Oct 2025 (Currency Board Sub-Committee record) [12] (28 Nov 2025)

Where it sits

Bab el-MandebStrait of HormuzStrait of MalaccaPanama CanalSuez CanalTaiwan Strait11. The Hong Kong dollar hits the weak end of its band and the HKMA buys it: Elevated impact · possible1 · Elevated impact · possibleBab el-MandebStrait of HormuzStrait of MalaccaPanama CanalSuez CanalTaiwan StraitUNITED STATESUNITED KINGDOMJAPANNORWAYFRANCEITALYPACIFIC OCEANINDIAN OCEANMap data: Natural Earth (public domain).
Bab el-MandebStrait of HormuzStrait of MalaccaPanama CanalSuez CanalTaiwan Strait11. The Hong Kong dollar hits the weak end of its band and the HKMA buys it: Elevated impact · possibleBab el-MandebStrait of HormuzStrait of MalaccaPanama CanalSuez CanalTaiwan StraitUNITED STATESJAPANFRANCEITALYINDIAN OCEANMap data: Natural Earth (public domain).

How it spreads

If

The HKMA's weak-side Convertibility Undertaking at HK$7.85 per US dollar is triggered, with the HKMA buying Hong Kong dollars from banks, at least once between 28 Oct 2026 and 31 Oct 2027, as reported by the HKMA.

Not under way

Channels 4 on the card

  1. CanadaNo Canadian channel loses.
  2. Interest ratesA trigger drains the Aggregate Balance and pushes HIBOR up towards US rates.
  3. PropertyHigher HIBOR weighs on a home market that only turned up in 2025 [13][11].
  4. MarketsA trigger is the system working as designed; no sourced sign of a peg change.

Sectors 2

  • Banks and lenders
  • Property

Countries 1

Who is exposed

Countries
Hong Kong
Sectors
Banks and lenders, Property, Households

Three scenarios and their signposts

  1. S1

    Weak-side defence

    The gap persists, the currency touches 7.85 and the HKMA buys Hong Kong dollars, as in mid-2025.

  2. S2

    Rates catch up

    Loan and IPO demand pull HIBOR up and the currency stays just inside the band.

  3. S3

    The gap closes

    The Fed holds or cuts and the currency moves back towards the middle of the band.

The signposts of each scenario
PathSignpost
S1An HKMA announcement of a weak-side trigger
S2One-month HIBOR above 3.5%
S3The Fed's December 2026 decision

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. 9 Dec 2026 FOMC decision (8-9 Dec) [10] Declared · Outside event

    Remind me

  2. 27 Jan 2027 FOMC decision (26-27 Jan) [10] Tentative · Outside event

    Remind me

  3. Mar 2027 HKMA Half-yearly Monetary and Financial Stability Report Tentative · Outside event
  4. 31 Oct 2027 End of the scored window [1] Declared · Strature date

    Remind me

Sign in, with alerts on, for an email 7 days and 1 day before.

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

The other side

Higher HIBOR lifts what savers earn on Hong Kong dollar deposits and lets banks price loans closer to their funding costs. A defended band shows the system working: in 2025 the currency stabilised after the triggers and later traded on the strong side [2].

Connected in Strature

Sources

13 sources, numbered as the text cites them

  1. Recent trend in the Hong Kong dollar (inSight, Eddie Yue). Hong Kong Monetary Authority · 6 Oct 2026 · Official · confidence high · retrieved 28 Oct 2026
  2. Annual Report 2025, Monetary Stability chapter. Hong Kong Monetary Authority · 2026 · Official · confidence high · retrieved 28 Oct 2026
  3. HKMA's response to media enquiries (weak-side CU triggered). Hong Kong Monetary Authority · 26 Jun 2025 · Official · confidence high · retrieved 28 Oct 2026
  4. HKD Interest Settlement Rates. The Hong Kong Association of Banks · 28 Oct 2026 · Industry · confidence high · retrieved 28 Oct 2026
  5. Federal Reserve issues FOMC statement. Board of Governors of the Federal Reserve System · 16 Sep 2026 · Official · confidence high · retrieved 28 Oct 2026
  6. Remarks after the US Fed FOMC Meeting (Eddie Yue). Hong Kong Monetary Authority · 17 Sep 2026 · Official · confidence high · retrieved 28 Oct 2026
  7. Daily figures of interbank liquidity (Aggregate Balance). Hong Kong Monetary Authority · 28 Oct 2026 · Official · confidence high · retrieved 28 Oct 2026
  8. USD/HKD holds 7.8436 inside the peg band. The Industry Spread · 24 Oct 2026 · Commentary · confidence low · retrieved 28 Oct 2026
  9. Meeting calendars and information, 2026-2027. Board of Governors of the Federal Reserve System · Official · confidence high · retrieved 28 Oct 2026
  10. Experts: HK residential property market in process of bottoming out. China Daily Hong Kong · 13 Jun 2026 · News · confidence medium · retrieved 28 Oct 2026
  11. Record of discussion of meeting of Exchange Fund Advisory Committee Currency Board Sub-Committee held on 20 October 2025. Hong Kong SAR Government (HKMA) · 28 Nov 2025 · Official · confidence high · retrieved 28 Oct 2026
  12. Hong Kong raises rates to track Fed hike. Business Today (Malaysia) · 17 Sep 2026 · News · confidence medium · retrieved 28 Oct 2026
  13. Federal Reserve issues FOMC statement. Board of Governors of the Federal Reserve System · 28 Oct 2026 · Official · confidence high · retrieved 28 Oct 2026

Reviewed 28 Oct 2026 · version 2 · last change: first review · All risks