US 10 Percent Tariff on Japan Expires Today as Markets Brace for Successor Measures

The 10% additional tariff the Trump administration has levied on Japan and many other trading partners expires after 1 pm Japan time today—but nobody in Tokyo is celebrating. A successor measure could be announced as early as July 23, and neither the rate nor the product coverage is known. For Japanese exporters this is less a liberation day than a lottery draw.

Three scenarios frame the outcome: continuity around 10% under a new label (prolonged uncertainty, manageable impact); higher rates or broader coverage (a direct hit to autos, machinery, and components, accelerating production shifts to the US); or partial exemptions for Japan under the year-old bilateral accord (an instant tailwind for exporter stocks). The 2018-19 US-China trade war taught markets that firms can adapt to a fixed tariff but not to rules that change quarterly—and Japanese companies have spent the past year adding US capacity and tariff pass-through clauses on exactly that logic.

The currency channel matters too: with the yen already near a 39-year low of 164 per dollar, today's announcement stacks directly onto the FX tape and constrains BOJ and MOF options. For Taiwanese supply-chain players, the product list will shape order flows between Japanese and Taiwanese suppliers. Watch the rate, the list, Tokyo's response, and the yen's first reaction.