Explainer · Japan & Korea allocators

The yen hedge, explained

Why a Japanese investor's return on your fund is your yield minus the rate gap, and what that does to your pitch

Written 3 September 2026 · All explainers

How to read the markers. [D] — verified from a source retrieved for this note, listed under Sources. [I] — industry-understood; not formally disclosed by a named party. [S] — our own inference or judgment. Every figure is either sourced or marked as an estimate.

The short version

A US-dollar fund that yields 10% does not yield 10% to a Japanese life insurer. If the insurer hedges the currency — locks in today the rate at which it will turn dollars back into yen — the hedge costs roughly the gap between short-term dollar and yen interest rates, plus a small extra charge called the cross-currency basis. On 1 September 2026 that gap was about 2.2 percentage points a year, and the basis added roughly a further 0.15–0.20. So the number a hedged Japanese investor actually compares against a Japanese government bond is your yield minus about 2.4 points, before fees. [D — rates and basis in Sources; the subtraction is arithmetic]

That is the easy part. A ten-year fund with unpredictable cash flows is much harder to hedge than a bond. The hedge is a chain of short contracts rolled every one to three months, each settling in cash, while the fund’s return sits unrealised in a valuation. When the yen weakens the hedge loses money that must be paid now, against a gain the investor cannot touch.

So there are two Japanese bids, and they want opposite things. The hedged bid is buying your credit spread over yen rates; it cares about the short-rate gap, and a Fed cut helps it. The unhedged bid is buying your fund and a bet on a weaker yen; a Fed cut hurts it. Pitch the hedged yield to the first, and know that the second is a currency view you do not control. [S]

1. What a hedge is, and why it costs the rate gap

A currency hedge is a promise made today about an exchange rate in the future. A Japanese insurer that has bought $100 million of a dollar fund can agree with a bank, today, to sell $100 million for yen in three months at a rate fixed now. That contract is an FX forward (a forward is any trade agreed now for a future date at a price set now). If the yen strengthens in the meantime, the fund’s yen value falls but the forward gains by the same amount.

The forward rate differs from today’s spot rate (the rate for exchange now), and the difference is the cost. The rule that sets it is covered interest parity: the interest-rate gap between two currencies must equal the gap between their forward and spot exchange rates. The BIS states the rule in those terms. [D — BIS 2016] The reason: the bank quoting the forward holds the dollars and earns dollar interest in the meantime, and hands the excess over yen interest back through a forward rate that gives you fewer yen per dollar.

Put in words: the annual cost of hedging dollars into yen is the short-term dollar rate minus the short-term yen rate. The forward prices off money-market rates, not the central banks’ policy rates directly, so the two gaps differ slightly.

Rate Level Date Source
Fed funds target range 3.50–3.75% held 29 July 2026 (and 28 January 2026) Federal Reserve [D]
BoJ policy rate (uncollateralised overnight call rate) around 1.0% raised from 0.75% on 16 June 2026; held 31 July 2026 Bank of Japan [D]
3-month US Treasury bill 3.78% 1 September 2026 FRED (DTB3) [D]
3-month yen TIBOR (Tokyo interbank rate) 1.56% 31 August 2026 JBA TIBOR Administration [D]
USD/JPY spot 159.97 28 August 2026 FRED (DEXJPUS) [D]

Policy-rate gap: 3.625 (midpoint) − 1.0 = 2.6 points. Three-month gap, which is what the forward actually prices: 3.78 − 1.56 = 2.22 points a year.

A three-month forward at those rates is about 159.08 yen per dollar against spot at 159.97 — 0.89 yen less per dollar in three months’ time. Annualised, that is −2.2%: the same number, reached through the exchange rate instead of the interest rates, which is what parity means. [D for the inputs; the forward is our calculation, 91-day tenor]

So what? A Japanese investor who hedges is swapping the dollar money-market rate for the yen one. Whatever your fund pays above the dollar rate — the credit spread — survives the hedge. Whatever it pays because dollar rates are high does not.

2. The basis: why yen investors pay more than the gap

Parity is the theory. Since the 2008 crisis it has not held exactly, and the gap between the theoretical hedge cost and the real one is the cross-currency basis — the amount by which borrowing a currency through the FX-swap market costs more (or less) than borrowing it directly. [D — BIS 2016]

For the yen the basis has been persistently negative: yen holders pay more than the rate gap for hedged dollars. The BIS gives two causes. Demand: Japanese banks needed dollars for overseas lending and Japanese life insurers wanted hedged dollar bonds, so many yen holders queued to borrow dollars forward at once. Supply: the banks that could arbitrage the gap away face balance-sheet costs, so they charge a premium for taking the other side of that demand rather than closing it. [D — BIS Quarterly Review 2016; BIS Working Paper 590]

The basis moves. On 9 April 2025, a Japanese investor hedging dollars for three months paid a premium of 35 basis points over the rate gap; at the start of 2026 it was 15–20 basis points. [D — Banque de France, 13 April 2026] A basis point is a hundredth of a percentage point, so 15–20 basis points is 0.15–0.20% a year — small next to the 2.2-point gap, but pure cost with nothing bought for it, and it widens at exactly the moments when everyone wants dollars.

From a dollar yield to a hedged yen yield: the waterfall A waterfall chart. A 10 percent illustrative dollar headline yield loses 2.2 points to the three-month dollar-yen rate gap, a further 0.2 points to the cross-currency basis, and an illustrative 1 point of fees, leaving a hedged yen yield of about 6.6 percent. Hedged into yen · what a Japanese investor actually receives Headline yield minus rate gap minus basis minus fees 10% 5% 0% % per year 10.0 USD headline illustrative −2.2 Rate gap 3m T-bill 3.78 − 3m TIBOR 1.56 −0.2 Basis 15–20bp, early 2026 −1.0 Fees illustrative ≈ 6.6 Hedged JPY yield what competes with a JGB 10y JGB 3.0% The hedged investor buys your spread over yen rates, not your dollar yield
Figure 1. The waterfall from a dollar yield to a hedged yen yield. The 10% headline and the 1% fee bar are illustrative round numbers. The 2.2-point rate gap is the 3-month T-bill (3.78%, 1 September 2026) minus 3-month yen TIBOR (1.56%, 31 August 2026); the 0.2-point basis is the top of the Banque de France's early-2026 range. The basis is a point-in-time figure and changes daily.

3. Why a ten-year fund is harder to hedge than a bond

Hedging a dollar bond is routine: the insurer knows the coupon dates, amounts and maturity, so it sizes the forward to the cash it will receive. A ten-year private credit fund breaks each of those certainties.

Unknown cash flows. The GP draws the commitment down in capital calls (requests for a slice of it) at dates the GP chooses, and returns it as loans repay. A hedge sized to the commitment over-hedges; one sized to the drawn amount must be resized at every call. Fund administrators now build a buffer into capital-call conversions for the exchange-rate move between notice and payment. [D — Aztec Group, February 2026]

Rolling. No bank quotes a ten-year forward at a sensible price on unknown cash flows, so the investor hedges with short contracts — typically one to three months — and rolls them: each settles in cash at expiry and a new one is opened. Hedged share classes in mainstream funds roll at least monthly. [D — PIMCO] Every roll re-prices the hedge at that day’s gap, so the investor is exposed to the path of the gap over ten years. Short contracts need less collateral but create a cash event at each expiry; a longer contract avoids the cash event but needs more credit from the bank. [D — SVB, September 2025]

Margin. A forward is a derivative, and the bank demands cash collateral — margin — when the contract moves against the investor. One adviser’s worked example is the whole problem: a €1bn fund hedging €200m of sterling sees sterling rise 5% in a month and must find €10m of cash, intra-month, to post or settle. [D — Ganymede Capital, August 2024]

The hedge pays in cash; the fund pays in valuation. If the yen weakens, the fund is worth more in yen, but that gain is unrealised and cannot be spent. The forward has lost money that must be paid at the roll. A liquid-fund manager sells a little of the asset to cover it; a private-fund manager cannot, which is why the same adviser calls the hedge “not as effective over time” for private funds. [D — Ganymede] BNY, from the manager’s side: hedge cash flows “crystallize on a much shorter timetable” than the assets, and the drain rises “precisely when the underlying portfolio is hardest to refinance, rebalance or monetize”. [D — BNY, July 2026]

So what? A hedged investor in an illiquid fund needs a cash reserve or credit line just to keep the hedge alive. That reserve earns the yen rate and drags on the return — a cost that never appears in the rate-gap arithmetic.

4. The two bids

The hedged investor has swapped the dollar rate for the yen rate. If the fund is floating-rate, as most private credit is, its coupon is the dollar rate plus a spread; the hedge removes the dollar rate and gives back the yen rate. What remains is yen rate + spread − basis. This investor is buying your credit spread, priced over yen. Daiwa reports that lifers adding hedged foreign bonds choose floating-rate assets precisely because they are “resilient in the face of hedging cost fluctuations”. [D — Daiwa, April 2026; the algebra is [S]]

The unhedged investor owns the dollar coupon and the dollar itself, in yen terms — your fund plus a view that the yen will not strengthen enough to eat the extra 2.2 points a year.

Event Hedged Japanese bid Unhedged Japanese bid
Fed cuts Hedge gets cheaper. Fixed-rate assets: hedged yield rises. Floating-rate: coupon and hedge cost fall together, roughly a wash. Lower dollar rates usually soften the dollar, so the yen value of the holding tends to fall.
BoJ hikes Hedge gets cheaper, so hedged yield rises — but JGB yields rise too, so the alternative improves at the same time. A higher yen rate usually firms the yen, so the holding tends to lose in yen terms.
Yen weakens Locked return, no gain — but the forward loses money and the roll drains cash now, against an unrealised gain. The holding gains in yen terms.

The unhedged column gives the usual direction, not a rule. [I — the hedged column follows from parity; the unhedged column is the conventional reading]

The two Japanese bids: how hedged and unhedged investors react to three events A two-by-three grid. Rows: hedged investor, unhedged investor. Columns: the Fed cuts, the BoJ hikes, the yen weakens. Hedged: up on a Fed cut because the hedge gets cheaper (floating-rate roughly flat), up on a BoJ hike because the gap narrows, flat on a weaker yen because the return is locked but the roll drains cash. Unhedged: down on a Fed cut as the dollar softens, down on a BoJ hike as the yen firms, up on a weaker yen. Two bids · opposite reactions Fed cuts BoJ hikes Yen weakens Hedged bid buys spread over yen rates rate-gap view Unhedged bid buys fund + dollar currency view Cheaper hedge gap narrows, hedged yield rises floating-rate fund: roughly a wash Narrower gap hedged yield rises but JGB yields rise too Locked return no gain, no loss forward loses cash at each roll Dollar softens yen value of holding falls usual direction, not a rule Yen firms yen value of holding falls usual direction, not a rule Currency gain yen value of holding rises the bet pays Hedged bid: a rate-gap view · Unhedged bid: a currency view
Figure 2. The two bids react to opposite things. Hedged (blue) is a rate-gap and credit-spread view; unhedged (gold) is a currency view. The floating-rate qualification in the Fed-cuts cell is discussed in the text.

Daiwa’s read of the FY2026 plans shows this in practice: hedging costs have “improved significantly” because of BoJ hikes and foreign cuts, yet hedged foreign bonds’ “investment appeal wanes when compared to JGBs, whose yields have risen significantly”, and for unhedged foreign bonds “none plan to increase them”. [D — Daiwa, April 2026] The BoJ’s April 2026 Financial System Report records lifers “cautious … with regard to accumulating unhedged foreign bonds”, with total foreign bond holdings “more or less unchanged”. [D — BoJ FSR, April 2026] The ten-year JGB yielded 3.0% on 2 September 2026. [D — MoF]

5. Where the money is

Japan’s life insurers held ¥418.52 trillion of total assets at end-FY2024 (March 2025), of which ¥105.27 trillion (25.2%) was foreign securities — ¥98.94 trillion foreign bonds and ¥6.33 trillion foreign stocks. [D — Life Insurance Association of Japan, Fact Book 2025]

How much is hedged is disclosed only in fragments, which agree on direction:

Measure Figure Period Source
Hedge ratio, nine major lifers (Bloomberg analysis of accounts) 45.2%, “a 13-year low” end-September 2024 Bloomberg Law [D]
Same measure 44.4%, “the lowest level in 14 years” end-March 2025 Mitrade, citing Bloomberg [D]
Japanese life sector hedging rate “roughly 60% to 40%” 2022 to 2024 BIS Quarterly Review, December 2025 [D]
Hedge ratios at major lifers “historically low levels” April 2026 Daiwa [D]
Lifers’ net purchases of foreign long-term debt +¥17.9bn (May), −¥41.3bn (June), −¥10.6bn (July) 2026 Ministry of Finance [D]

The BoJ’s October 2025 Financial System Report says lifers “have reduced their holdings of currency-hedged foreign bonds”. [D — BoJ FSR, October 2025] Daiwa flags the reverse risk: if lifers raised hedge ratios again, the yen demand would create “widening pressure on a short-term currency basis” — the basis in section 2 is partly made by the investors this piece is about. [D — Daiwa]

GPIF, the public pension reserve fund, is the clearest unhedged bid. Its foreign-bond benchmark for FY2025–FY2029 is the FTSE World Government Bond Index “excluding Japan, excluding China, unhedged, yen basis”, and its principles say “currency-hedged foreign bonds should be positioned as domestic bonds”. [D — GPIF] Once the currency is hedged, the investment competes with JGBs, not with global bonds.

6. What GPs do about it

Three structures, each of which moves the hedging problem rather than removing it.

A JPY-hedged share class. The fund runs the hedge inside the vehicle for the yen class only: a forward converts the base currency into yen at a set rate on a set date, rolled at least monthly, and “all gains, losses, and transactions costs of hedging transactions are solely borne by the investors in the hedged share class”. [D — PIMCO] The investor gets a yen return with no operational burden; the GP takes on the margin, cash buffer and roll discipline of section 3. Hamilton Lane added a yen-hedged class to its open-ended senior private credit fund in 2025 and reports it “resonated” with Japanese regional banks and corporate pensions. [D — Alternative Credit Investor, July 2026]

A yen feeder or Japanese wrapper. A separate vehicle built for Japanese balance sheets. Maples describes the “PE-type unit trust” — a Cayman or Irish unit trust with capital-call mechanics — which “produces a current net asset value that reflects both realised and unrealised gains” and so lets Japanese institutions “measure exposure, hedge currency risk, and account for their position more easily” than a limited partnership. [D — Maples, March 2026]

Partial hedging, or none. Many institutions hedge a share — the 44–46% ratios above are an average of exactly that — or use options that cap the cost. [D — Bloomberg Law; Daiwa] Some run unhedged because their liabilities are in foreign currency too (the BoJ counts bonds “earmarked for foreign currency-denominated insurance” as unhedged [D — BoJ FSR]), or because they hold the currency view in section 4.

The pitch implication follows from section 1. To a hedged Japanese investor, quote the hedged yield — your spread over the yen rate, less the basis and the reserve drag — never the dollar headline. A 10% dollar yield is a 7.6% yen yield before fees at today’s gap, and it was lower when the gap was wider. The unhedged investor will hear the 10%, but is buying a currency bet alongside it and will judge you on both. [S]

Caveats

  • All rates, the spot rate and the basis are point-in-time figures from late August and early September 2026 and move daily. The 2.2-point gap and the 15–20bp basis are an order of magnitude, not a quote.
  • The forward rate and annualised cost in section 1 are our calculation from the parity formula with a 91-day tenor, the 3-month T-bill and 3-month TIBOR. A dealer’s forward uses its own funding rates and adds the basis and a spread; the figure will differ by tens of basis points.
  • The 10% headline and the 1% fee bar in Figure 1 are illustrative. Fund fees vary and are not modelled.
  • The Banque de France basis figures are for early 2026; no more recent 3-month yen basis was retrieved from a primary source. The BIS December 2025 review confirms direction but gives no basis-point level.
  • The BIS “roughly 60% to 40%, 2022 to 2024” figure and the 44–46% Bloomberg-analysis ratios are different measures from different samples; they agree on direction, not level. The BoJ’s chart is the primary series, but its values are not printed in the text.
  • The Bloomberg analyses are cited via Bloomberg Law (undated page covering end-September 2024) and Mitrade (May 2025), because Bloomberg’s own pages did not load. The December 2025 update (reported elsewhere as 45.7% at end-September 2025) did not load from any source and is not relied on.
  • The unhedged column of the section 4 table gives the conventional direction of the currency’s reaction, not a measured one.
  • The floating-rate “wash” on a Fed cut is our algebra, corroborated by Daiwa’s observation about lifers preferring floating-rate assets; no source states it directly.
  • The MoF monthly figures are lifers’ net purchases of foreign long-term debt for three months only; they show neither holdings nor hedge status.
  • No disclosure was found of any Japanese institution’s hedged share of private-fund (as opposed to bond) holdings.

Sources [D]

All retrieved and confirmed to load on 3 September 2026.

Policy rates

Market rates

Covered interest parity and the basis

Japanese institutions

Hedging mechanics and fund structures