The Treasury may need to borrow an extra $1.6 trillion to cover the hole left by tariff ruling and pay a further $400 billion in debt interest

When the Supreme Court ruled late last month that the majority of tariffs implemented by the second Trump administration in 2025 were illegal, it left something of a hole in the Treasury’s coffers.

The White House had been relying on the circa $300 billion-a-year in revenues to help fund a raft of policies, from tariff rebate checks to corporate tax writeoffs in the One Big Beautiful Bill Act.

But the court ruling threw a wrench into the works: The justices ruled the administration...