U.S. GAO - Debt Limit: Delays Create Debt Management Challenges and Increase Uncertainty in the Treasury Market

The debt limit does not control or limit the ability of the federal government to run deficits or incur obligations. Rather, it is a limit on the ability to pay obligations already incurred. While debates surrounding the debt limit may raise awareness about the federal government's current debt trajectory and may also provide Congress with an opportunity to debate the fiscal policy decisions driving that trajectory, the ability to have an immediate effect on debt levels is limited. This is because the debt reflects previously enacted tax and spending policies.