US Tariff Shakeup Leaves Treasury Markets Digging for Direction

The Supreme Court's decision to strike down President Trump's tariff policy didn't exactly clarify the road ahead. Instead, it tossed a grenade into the mix, leaving Treasury markets scrambling to reassess risk in an already jittery environment.

While the ruling halted the tariffs, it didn't settle the question of refunds - a potential budget black hole estimated around $170 billion. Meanwhile, Trump's rapid rollout of replacement tariffs is stirring up tension overseas, particularly in Europe, adding another layer of uncertainty to the trade narrative.

Dollar weakness was the immediate response, with notable slippage against safe havens like the Swiss franc and Japanese yen during Asian trading hours. Treasury yields wobbled too, as investors struggled to connect the dots between trade policy disruptions, the U.S. deficit, and inflation expectations.

On paper, the replacement tariffs are lower-expected to ease near-term pressure on prices. Yet, the Supreme Court's decision clipped Trump's tariff authority, shaking up his playbook and leaving markets to puzzle over what's next. One thing's clear: uncertainty is back and it's got the potential to stick.

Some analysts, like those at ING, highlight the risk of escalation here, pointing to recent bruises in U.S.-Europe relations. Litigation over tariff refunds is on the horizon, with court battles likely dragging on for months if not longer. Considering tariffs have already hauled in over $175 billion, the pressure on government financing could intensify.

Dan Siluk from Janus Henderson (NYSE:JH) flagged a concern that refund payouts could mean more debt issuance - perhaps steepening the yield curve further, especially as borrowing needs stay high in a climate of quantitative tightening. Treasury yields, after spiking above 4.5% last year, have since eased but the curve's steepening signals underlying caution.

Looking at fiscal impact, estimates once pegged Trump's tariffs as a $300 billion annual earner over a decade, which now looks shaky. The replacement 15% tariff has a short shelf life, and its scope remains uncertain - rates vary significantly by country, complicating revenue forecasts.

From the bond market perspective, Gene Goldman of Cetera Investment Management sees bigger borrowing needs looming if refunds have to be paid, on top of other government spending. Yet some views, including Morgan Stanley (NYSE:MS), suggest market jitters may be muted, banking on substitutes for tariff revenue and a focus on short-term Treasury bills for funding.

For now, the dollar continues to slide, down about 0.4% against the euro with a total erosion near 12% since Trump's second term kicked off in early 2025. Barclays notes the Court's ruling could restore a glimpse of institutional checks and balances, potentially easing some risk premiums on U.S. assets. Still, with inflation concerns lingering and global liquidity moving the needle, the market has plenty to chew on.