USD/JPY Rate Differential — Federal Reserve vs Bank of Japan
The defining carry pair: a wide nominal spread and the BoJ's unique trajectory
Data generated May 29, 2026
The defining carry pair
USD/JPY is the highest-volume carry pair in the world. The reason is structural: the BoJ ran negative or near-zero rates for the better part of a generation while the Fed cycled between roughly 0% and 5%+. That created a near-permanent positive carry on a long USD/JPY position and turned the pair into a global proxy for risk-on versus risk-off — when carry trades unwind, USD/JPY drops first and fastest.
The current setup
The Fed-BoJ spread is by far the widest nominal differential among the nine banks we cover. The Fed sits several percentage points above the BoJ. That spread is the largest single source of running yield in the FX majors. The unique feature of the current cycle is that the BoJ is finally in a hiking trajectory while the Fed is in a cutting trajectory — meaning the spread compresses from both ends simultaneously, not just from the dollar side.
This bilateral compression is why the long USD/JPY carry trade has become more contentious than at any point in the last decade. Investors are not just losing yield from Fed cuts; they are paying yield from BoJ hikes. The math turns far less attractive far faster than in previous cutting cycles.
What each bank’s path implies
Federal Reserve: the Fed’s projected 12-month path is firmly toward easing, narrowing the spread by the cumulative cut amount.
Bank of Japan: the BoJ’s projected path is the only one of the nine that is upward-sloping. Even modest BoJ hikes — 25 to 50 basis points cumulatively over a year — narrow the spread further. The combined narrowing from both directions is the steepest of any major cross.
What this means for the yen
Several second-order effects matter:
- Carry decay: investors holding long USD/JPY for yield are watching that yield decline month by month. As the running carry approaches zero, the position becomes harder to justify on yield alone.
- Repatriation pressure: Japanese institutional investors hold large foreign bond portfolios that are unhedged or partially hedged. As BoJ rates rise and JGB yields rise with them, the relative attractiveness of foreign bonds (especially Treasuries) declines. Repatriation flows are mechanical: they buy yen.
- Volatility regime: USD/JPY has historically had asymmetric volatility — quiet during yen weakness, violent during yen strengthening. The current cycle is biased toward the violent side.
Recent divergence
The spread peaked in 2024-2025 when Fed hikes met BoJ caution. The current cycle is the unwinding of that peak, with the spread set to compress materially over the next 12 to 18 months. Whether spot USD/JPY moves linearly with the spread is uncertain — yen pairs have a habit of stair-stepping, with long quiet periods punctuated by sharp moves around BoJ communication or Fed pivot moments.
How to use this page
The carry ranking shows USD/JPY at or near the top of the carry table. The policy divergence page shows the Fed-BoJ pair at or near the top of the amplitude ranking — meaning the spread moves the most over the next 12 months of any pair we project. For BoJ-specific commentary, see the BoJ page.
Methodology
The spread uses the Fed funds target upper bound and the BoJ’s policy rate (overnight call rate target). Forward spreads use the 12-month implied path. JGB yield curve dynamics, which matter heavily for cross-currency basis trades on the pair, are not modeled here — this page focuses purely on the policy rate differential.
