Federal Debt and the Statutory Limit, February 2023

"The debt limit—commonly called the debt ceiling—is the maximum amount of debt that the Department of the Treasury can issue to the public or to other federal agencies. The amount is set by law and has been increased or suspended over the years to allow for the additional borrowing needed to finance the government’s operations. On December 16, 2021, lawmakers raised the debt limit by $2.5 trillion to a total of $31.4 trillion.1 On January 19, 2023, that limit was reached, and the Treasury announced a “debt issuance suspension period” during which, under current law, it can take well-established “extraordinary measures” to borrow additional funds without breaching the debt ceiling.

The Congressional Budget Office projects that, if the debt limit remains unchanged, the government’s ability to borrow using extraordinary measures will be exhausted between July and September 2023—that is, in the fourth quarter of the current fiscal year. The projected exhaustion date is uncertain because the timing and amount of revenue collections and outlays over the intervening months could differ from CBO’s projections. In particular, income tax receipts in April could be more or less than CBO estimates. If those receipts fell short of estimated amounts—for example, if capital gains realizations in 2022 were smaller or if U.S. income growth slowed by more in early calendar year 2023 than CBO projected—the extraordinary measures could be exhausted sooner, and the Treasury could run out of funds before July.

If the debt limit is not raised or suspended before the extraordinary measures are exhausted, the government would be unable to pay its obligations fully.2 As a result, the government would have to delay making payments for some activities, default on its debt obligations, or both.."
Federal debt 

The Debt Limit: History and Recent Increases

"Total federal debt can increase in two ways. First, debt increases when the government sells debt to the public to finance budget deficits and acquire the financial resources needed to meet its obligations. This increases debt held by the public. Second, debt increases when the federal government issues debt to certain government accounts, such as the Social Security, Medicare, and Transportation trust funds, in exchange for their reported surpluses. This increases debt held by government accounts..."
Debt Limit

Reaching the Debt Limit: Background and Potential Effects on Government Operation
"The gross federal debt, which represents the federal government’s total outstanding debt, consists of two types of debt: (1) debt held by the public and (2) debt held in government accounts, also known as intragovernmental debt. Federal government borrowing increases for two primary reasons: (1) budget deficits and (2) investments of any federal government account surpluses in Treasury securities, as required by law. Nearly all of this debt is subject to the statutory limit. The federal debt limit currently stands at $14,294 billion.

Treasury has yet to face a situation in which it was unable to pay its obligations as a result of
reaching the debt limit. In the past, the debt limit has always been raised before the debt reached the limit. However, on several occasions Treasury took extraordinary actions to avoid reaching the limit and, as a result, affected the operations of certain programs. If the Secretary of the Treasury determines that the issuance of obligations of the United States may not be made
without exceeding the public debt limit, Treasury can make use of “extraordinary measures.”
Some of these measures require the Treasury Secretary to authorize a debt issuance suspension
period..."