The federal budget is due by September 30 each year. That is the date by which all 12 annual appropriations bills must be passed by Congress and signed by the President, because the federal fiscal year ends September 30 and the new one begins October 1. If the bills are not enacted by then, the government loses legal authority to spend money on most discretionary programs. Several earlier statutory deadlines feed into that final date, though in practice nearly all of them are missed.
Why September 30 Is the Hard Deadline
The federal government does not run on a calendar year. Its fiscal year runs from October 1 through September 30, so fiscal year 2026 began on October 1, 2025 and ends on September 30, 2026.1Office of the Law Revision Counsel. 31 USC 1102 – Fiscal Year Every other deadline in the budget process works backward from that September 30 wall. Miss it, and either a continuing resolution or a shutdown follows on October 1.
The President’s Budget Proposal: First Monday in February
The process officially begins with the President’s budget request to Congress. Federal law sets the deadline as the first Monday in February. The proposal covers every federal agency and includes revenue estimates, spending, the national debt, and economic projections for the current year plus at least four years beyond it.2Office of the Law Revision Counsel. 31 USC 1105 – Budget Contents and Submission to Congress
The proposal is a request, not a law. Congress can ignore it. But it sets the terms of debate and gives the Congressional Budget Office data for its own analysis.
Presidents miss this deadline routinely. New administrations especially need time to set priorities. The fiscal year 2026 budget request was not submitted until late May 2025, nearly four months late. There is no penalty for missing the date, which is why it functions as a target rather than an enforceable rule.
The Mid-Session Review: Before July 16
The President’s obligations do not end in February. Federal law also requires a supplemental budget update, the Mid-Session Review, before July 16 each year.3Office of the Law Revision Counsel. 31 US Code 1106 – Supplemental Budget Estimates and Changes It updates the original numbers with revised economic conditions, spending estimates, and any new obligations that have emerged since February.
The CBO’s Budget and Economic Outlook: January or February
Before Congress writes its own budget, the Congressional Budget Office publishes its annual Budget and Economic Outlook report, typically in January or February. The most recent edition, covering fiscal years 2026 through 2036, was released on February 11, 2026.4Congressional Budget Office. Outlook for the Budget and the Economy It provides nonpartisan projections of federal revenue, spending, deficits, and economic growth that serve as the baseline for negotiations.
The CBO’s numbers often differ from the White House’s, sometimes significantly, and those differences shape the debate that follows.
The Congressional Budget Resolution: April 15
Congress is supposed to adopt its own budget framework, called a concurrent resolution on the budget, by April 15.5Office of the Law Revision Counsel. 2 USC 631 – Timetable The resolution sets overall spending and revenue targets for the coming fiscal year and at least four years beyond it, plus totals for broad spending categories, the expected deficit or surplus, and the level of public debt.6Office of the Law Revision Counsel. 2 USC 632 – Annual Adoption of Concurrent Resolution on the Budget
The resolution is not a law. The President does not sign it. It is an internal House-Senate agreement setting the ceiling that individual appropriations bills must stay beneath.
Congress almost never meets this deadline. As of 2023, Congress had failed to complete a budget resolution by April 15 for more than 20 consecutive years. When no resolution is adopted, each chamber can pass a deeming resolution instead, which sets enforceable spending levels as a substitute.7U.S. Senate Budget Committee. Deeming Resolutions: Budget Enforcement in the Absence of a Budget Resolution The appropriations process continues either way.
The 12 Appropriations Bills: Signed by September 30
Once spending targets are set, the work moves to the Appropriations Committees. Each chamber has 12 subcommittees that handle a specific slice of federal spending, covering defense, agriculture, transportation, energy, and other areas.8U.S. Senate Committee on Appropriations. Subcommittees Each subcommittee drafts its bill, holds hearings, and marks it up before it reaches the full committee.
Each of the 12 bills must pass both the House and Senate in identical form and be signed by the President before October 1. Completing all 12 on time has become exceptionally rare. The bills often get bundled into omnibus packages or extended through temporary funding measures.
Worth knowing: only about 25 percent of federal spending flows through these annual bills. The rest is mandatory spending on programs like Social Security, Medicare, and Medicaid, which run on autopilot under permanent laws and do not require yearly approval. A missed September 30 deadline does not stop Social Security checks or Medicare payments. The annual fight is over that smaller discretionary slice.
The Full Timeline at a Glance
- January or February: CBO releases its Budget and Economic Outlook.
- First Monday in February: President’s budget proposal due to Congress.
- April 15: Congressional budget resolution due.
- Before July 16: President submits the Mid-Session Review.
- September 30: All 12 appropriations bills must be signed into law.
- October 1: New fiscal year begins.
What Happens If September 30 Passes
When October 1 arrives without all 12 appropriations bills signed, Congress has two options: pass a temporary funding measure or allow a shutdown.
Continuing Resolutions
The usual workaround is a continuing resolution, which keeps agencies funded at prior-year levels for a set period while negotiations continue.9U.S. Government Accountability Office. What Is a Continuing Resolution and How Does It Impact Government Operations Continuing resolutions are meant as stopgaps, but they have become routine. Some fiscal years run entirely on them without final appropriations ever being enacted.
Because funding is frozen at prior-year levels, agencies operating under a continuing resolution cannot start new programs, adjust to changing needs, or implement expansions Congress has already authorized.
Government Shutdowns
If neither appropriations bills nor a continuing resolution is enacted, the government enters a shutdown. The legal basis is the Antideficiency Act, which prohibits federal agencies from spending or obligating funds without an appropriation from Congress.10Office of the Law Revision Counsel. 31 USC 1341 – Limitations on Expending and Obligating Amounts A companion provision bars agencies from accepting volunteer work or employing people beyond what Congress has authorized, except in emergencies involving the safety of human life or the protection of property.11Office of the Law Revision Counsel. 31 US Code 1342 – Limitation on Voluntary Services
The scope of a shutdown depends on how many of the 12 bills remain unsigned. If Congress has passed some but not others, only the unfunded agencies shut down.
The Debt Ceiling Is Not This Deadline
People often confuse the September 30 budget deadline with the debt ceiling. They are entirely different. A missed budget deadline cuts off funding for discretionary programs. A debt ceiling crisis happens when the government hits its legal borrowing limit and cannot issue new debt to pay obligations it has already incurred. The debt ceiling has no fixed annual date; it is reached whenever cumulative borrowing hits the statutory cap. When it does, the Treasury Department deploys extraordinary measures, including suspending investments in federal retirement funds and halting sales of certain Treasury securities, to keep paying bills temporarily.12Department of the Treasury. Description of Extraordinary Measures
Every step in the budget timeline carries a statutory deadline, and nearly every one is treated as aspirational. The system holds together because the October 1 fiscal year start creates a hard wall that forces some kind of resolution by September 30, even when that resolution is just another temporary patch.