CBO, Report: Federal Debt and the Statutory Limit, May 2023

“The Congressional Budget Office projects that if the debt limit remains unchanged, there is a significant risk that at some point in the first two weeks of June, the government will no longer be able to pay all of its obligations. The extent to which the Treasury will be able to fund the government’s ongoing operations will remain uncertain throughout May, even if the Treasury ultimately runs out of funds in early June. That uncertainty exists because the timing and amount of revenue collections and outlays over the intervening weeks could differ from CBO’s projections.”