BOJ Hike to c.1.25%: Stronger Yen and Tighter Global Funding Raise Discount Rates for Long-Dated African Eurobonds

The Bank of Japan raised its policy rate by 25bp to around 1. 25% on Sept 18, 2026, the highest BOJ short-term rate since the mid-1990s, with a non‑unanimous board vote. The move supports a stronger yen versus the dollar and compresses global cross‑currency carry that had favoured dollar‑short, yen‑funded positions. That shift tightens dollar liquidity and raises the effective cost of funding for investors who had relied on cheaper yen financing. A stronger yen and tighter cross‑currency arbitrage transmit to African sovereign and corporate credit by repricing global discount rates and reducing demand for duration.

Long‑dated Eurobonds are most exposed: paper where carry funded from low‑cost yen positions mattered (for example longer‑dated Ghana, Zambia or 10+ year South African sovereigns and high‑duration African corporates) will face valuation pressure through higher hurdle rates and potential spread widening if risk premia do not compress. The mechanism is twofold — higher global funding costs reduce demand for leveraged EM duration, while a stronger yen relative to the dollar can trigger portfolio adjustments that push investors toward higher quality or shorter duration EM exposure. Compared with peers, higher‑beta Ghana and Zambia (longer‑dated issues and restructurings) are more sensitive to a flow‑driven tightening than higher‑rated South Africa or Morocco, where domestic local‑currency demand and deeper domestic curves provide some insulation. Credits with concentrated external amortisations in the long end carry a larger refinancing premium if swap and cross‑currency liquidity tightens. The desk will watch cross‑currency basis moves and JP Morgan/ICE swap spreads as the conditional signal: sustained basis tightening or impaired dollar funding would amplify long‑duration premium and force further spread repricing in high‑duration African credits.