The federal budget needs to be passed by September 30 each year, the last day of the federal fiscal year. If Congress and the President have not enacted spending legislation by then, funding authority for most agencies expires at midnight and a shutdown begins on October 1. In practice, Congress almost never meets that deadline and keeps the government running through short-term extensions while negotiations continue.1USAGov. The Federal Budget Process
Why September 30 Is the Hard Deadline
The federal government’s financial year runs from October 1 through September 30 of the following year. Fiscal year 2026 began on October 1, 2025, and ends on September 30, 2026.1USAGov. The Federal Budget Process When that final day passes without new spending legislation in place, the legal authority letting federal agencies draw money from the Treasury runs out.
The Constitution is what gives the date its force. Article I, Section 9 states that no money can leave the Treasury except through appropriations made by law.2Constitution Center. Interpretation: Appropriations Clause Creating an agency or authorizing a program does not, by itself, permit spending. Congress has to separately appropriate the funds, and for most agencies those appropriations expire at the end of each fiscal year.
The Earlier Deadlines Congress Is Supposed to Hit
Long before September 30, federal law sets a series of internal checkpoints. The Congressional Budget Act of 1974, codified at 2 U.S.C. § 631, lays out three key dates each year:3Office of the Law Revision Counsel. 2 USC 631 – Timetable
- First Monday in February: the President submits a budget proposal to Congress. It is a request, not legislation, and Congress is free to ignore it.
- April 15: Congress adopts a concurrent budget resolution setting overall spending and revenue targets. The resolution is not signed by the President and does not have the force of law. It is an internal agreement between the House and Senate.4Library of Congress. The Congressional Budget Resolution: Frequently Asked Questions
- June 30: the House finishes action on all twelve annual appropriation bills, the legal vehicles that actually authorize agencies to spend. Wrapping them by midsummer is meant to give the Senate time to pass its versions and reconcile differences before October 1.
Why Congress Almost Never Meets These Deadlines
The dates in the Congressional Budget Act are targets, not enforceable requirements. Nothing happens when Congress misses them. Since the current fiscal year calendar took effect in 1977, Congress has passed all twelve appropriation bills on time only four times: for fiscal years 1977, 1989, 1995, and 1997. Every year since 1997, the government has entered the new fiscal year without full-year funding in place.
The reasons are political. The twelve bills cover everything from defense to housing, and each becomes a vehicle for policy disputes unrelated to dollar amounts. Riders, amendments, and partisan standoffs stall individual bills for months. The budget resolution itself often fails because the two chambers cannot agree on top-line spending levels, and when that framework collapses early in the year the rest of the timetable becomes meaningless.
What Happens When the September 30 Deadline Is Missed
When Congress cannot finish the appropriation bills in time, it usually passes a continuing resolution. A continuing resolution is a short-term spending bill that generally holds agency funding at the prior year’s level for a set number of weeks or months.5U.S. Government Accountability Office. What is a Continuing Resolution and How Does It Impact Government Operations? It must clear both chambers and be signed by the President, like any other legislation.
Each continuing resolution has its own expiration date, which then becomes the new deadline for either passing full-year funding or approving another extension. Some fiscal years see several stacked back to back. Continuing resolutions generally bar agencies from starting new programs or making significant changes to existing ones, though they sometimes carry targeted exceptions called “anomalies” that let specific agencies spend above or below prior-year levels.
What Happens If There’s No Continuing Resolution Either
A shutdown begins when neither full-year appropriations nor a continuing resolution is in place before existing spending authority expires. Under the Antideficiency Act, federal officials cannot authorize spending or enter contracts when no appropriation covers the cost.6Office of the Law Revision Counsel. 31 USC 1341 – Limitations on Expending and Obligating Amounts
Each agency then activates a contingency plan that sorts employees into categories. “Excepted” employees, whose work involves the safety of human life or the protection of property, keep reporting to work without pay until the shutdown ends.7U.S. Government Accountability Office. Antideficiency Act “Exempt” employees are funded through sources other than annual appropriations and are unaffected. Everyone else is furloughed and legally barred from working.
Federal law now guarantees back pay. Under 31 U.S.C. § 1341(c), employees who miss paychecks because of a lapse in appropriations receive retroactive pay at their standard rate once funding is restored, and the same guarantee covers excepted employees who kept working.8OPM. Employee Pay, Leave, Benefits, and Other Human Resources Programs Affected by the Lapse in Appropriations The timing gap still bites: bills do not wait, and workers can go weeks without a check during a long shutdown.
On the service side, national parks may close, tax refund processing slows, federal loan approvals for housing and small businesses stall, and regulatory agencies suspend most inspections and enforcement. The longer a shutdown lasts, the further the disruption spreads to federal contractors, nearby businesses, and state programs relying on federal grants.
What the September 30 Deadline Does Not Cover
The annual deadline controls only part of federal spending. Discretionary programs, funded through the twelve appropriation bills, lose their authority when Congress misses the date. Mandatory programs, including Social Security, Medicare, and Medicaid, run on permanent authorizations written into the laws that created them and do not need annual appropriations to keep paying benefits.9Social Security Administration. Budget Estimates Mandatory spending accounts for roughly two-thirds of all federal outlays, so Social Security checks, Medicare reimbursements, and similar payments continue regardless of whether Congress passes a single appropriation bill.
The debt ceiling is a separate deadline entirely, and it is often confused with the budget deadline. The debt limit, set under 31 U.S.C. § 3101, caps the total amount the Treasury can borrow to pay obligations Congress has already authorized.10Office of the Law Revision Counsel. 31 USC 3101 – Public Debt Limit Raising it does not approve new spending; it lets the government pay bills it has already run up. When the ceiling is reached, Treasury can use “extraordinary measures” to keep paying obligations for a while, but those measures are finite.11Department of the Treasury. Description of the Extraordinary Measures The debt ceiling has no fixed annual date; it becomes an issue whenever accumulated borrowing approaches the statutory limit, which can happen at any point in the year.