WASHINGTON—An unprecedented gush of income tax revenue is flowing into the federal government, driven in part by investors and business owners, and the size and speed of the increase has surprised even the nation’s fiscal-policy experts.
Individual income tax collections are poised to reach $2.6 trillion, or 10.6% of the economy in the fiscal year that ends Sept. 30, according to the Congressional Budget Office. That is up from 9.1% in 2021 and would mark a record in the 109-year history of the tax, topping the war-tax receipts of 1944 and the dot-com boom of 2000.
