The Department of Treasury will likely no longer be able to satisfy all of the governments' obligations if Congress has not acted to raise or suspend the debt limit by early June, and potentially as early as June 1, estimated Yellen in the letter.
Yellen made the assessment after obtaining additional information on the latest data, and federal receipts, outlays, following her earlier letter of this kind on May 1.
"Waiting until the last minute to suspend or increase the debt limit can cause serious harm to business and consumer confidence, raise short-term borrowing costs for taxpayers, and negatively impact the credit rating of the United States," warned Yellen.
"In fact, we have already seen Treasury's borrowing costs increase substantially for securities maturing in early June," she added.
If the U.S. Congress fails to increase the debt limit, it would cause severe hardship to American families, harm U.S. global leadership position, and raise questions about U.S. ability to defend its national security interests, according to Yellen.
The second meeting between U.S. President Joe Biden and congressional leaders on budget and debt ceiling has been postponed from last Friday to Tuesday.
Biden and congressional leaders discussed the budget issue for the 2024 fiscal year last Tuesday but failed to generate meaningful breakthroughs.
Though Biden has expressed optimism on prospects of the second meeting, House Speaker Kevin McCarthy said on Monday that there's been "no progress" on debt ceiling talks ahead of the meeting.
In January, the United States hit its 31.4-trillion-U.S.-dollar debt limit, set in December 2021, prompting the Treasury Department to use accounting maneuvers known as "extraordinary measures" to keep the government paying its bills, such as curbing certain government investments.
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