The federal budget moves through four phases: formulation inside the Executive Branch, congressional action on Capitol Hill, execution by the agencies that actually spend the money, and audit by independent reviewers who check how it was spent. Each phase feeds the next, and because the federal fiscal year runs October 1 through September 30, work on several budgets is almost always happening at once. Understanding the four phases of the federal budget cycle explains both how the government funds itself and why the process so often breaks down before October 1.
Phase 1: Formulation
Formulation starts inside the Executive Branch, often 18 months or more before the fiscal year it will fund. Federal agencies assess what they need and send budget requests to the Office of Management and Budget, which sits within the Executive Office of the President. OMB weighs every request against the President’s priorities and fiscal targets, then returns a “passback” with approved funding levels. Agencies can appeal, but OMB has the final word inside the administration.
OMB then assembles the pieces into a single document: the President’s budget proposal. Federal law requires the President to submit it to Congress no later than the first Monday in February.1Office of the Law Revision Counsel. 31 USC 1105 – Budget Contents and Submission to Congress New administrations routinely miss that deadline. For fiscal year 2026, the White House sent Congress a preliminary “skinny budget” on May 2, 2025, three months late.2The White House. The White House Office of Management and Budget Releases the President’s Fiscal Year 2026 Skinny Budget
The proposal is not binding. Congress can adopt it, ignore it, or rewrite it. It does set the terms of debate and shows which programs the administration wants to grow, shrink, or eliminate.
Phase 2: Congressional Action
Once the proposal arrives, the legislative branch takes over. The rules governing this phase come from the Congressional Budget and Impoundment Control Act of 1974, which created the House and Senate Budget Committees and the Congressional Budget Office.3Congressional Budget Office. History Several distinct steps happen inside this phase.
The Budget Resolution
The Budget Committees draft a budget resolution setting overall spending limits and revenue targets for the coming year and at least four years out. A budget resolution is not a law. It is a concurrent resolution, an internal House-Senate agreement that never goes to the President.4Congress.gov. The Congressional Budget Resolution: Frequently Asked Questions It works as a blueprint for the appropriations bills that follow and can trigger reconciliation.
The statutory deadline is April 15.5U.S. House Committee on the Budget. Time Table of the Budget Process Congress rarely meets it. In most years since the modern process began, the resolution has been adopted late or skipped entirely. When it is skipped, a chamber can pass a “deeming resolution” that sets spending levels for the appropriators to work with.
CBO Scoring
The Congressional Budget Office produces a cost estimate for nearly every bill approved by a full committee in either chamber, measured against its baseline projection of spending under current law.6Congressional Budget Office. CBO Explains How It Incorporates Administrative and Judicial Actions When Updating Its Baseline Projections and Preparing Cost Estimates These nonpartisan numbers give lawmakers a check on the administration’s own projections. For revenue provisions, CBO uses estimates from the Joint Committee on Taxation.
Appropriations Bills
The Appropriations Committees split discretionary spending across 12 separate bills, each covering a slice of the government: defense, transportation, homeland security, and so on.7Congress.gov. Appropriations Status Table: FY2026 These bills give agencies the legal authority to draw money from the Treasury. When the House and Senate versions differ, a conference committee reconciles them, both chambers vote on the final text, and the President must sign each bill.
Getting all 12 through both chambers and signed before October 1 is the exception, not the rule. What happens when they don’t is covered under execution.
Budget Reconciliation
If the budget resolution contains reconciliation instructions, Congress can use an expedited process to change spending, revenues, or the debt limit. Reconciliation bills cannot be filibustered in the Senate, so they need only a simple majority instead of the 60 votes usually required to end debate. That makes reconciliation one of the most powerful tools for enacting large fiscal legislation, though the Byrd Rule limits what can ride along: provisions that don’t change outlays or revenues, or that would increase deficits outside the reconciliation window, can be struck as “extraneous.”8Office of the Law Revision Counsel. 2 USC 644 – Extraneous Matter in Reconciliation Legislation
What Congress Does and Doesn’t Control Each Year
A common misconception is that the annual appropriations fight covers all federal spending. It doesn’t. Mandatory spending, which includes Social Security, Medicare, and Medicaid, accounts for nearly two-thirds of federal spending and flows automatically under eligibility rules already written into law.9U.S. Treasury Fiscal Data. Federal Spending Congress does not vote on those amounts each year. Changing them requires amending the underlying statute, often through reconciliation.
The 12 appropriations bills fund discretionary spending: defense, education, transportation, scientific research, and most day-to-day operations. That is the piece of the budget the annual cycle actually controls.
Phase 3: Execution
Once the President signs an appropriations bill, the money does not land in agency accounts all at once. OMB releases it through a process called apportionment. Each agency requests permission to spend its funds in increments, usually by quarter or by program activity. OMB reviews and can adjust the request before approving it. Agencies then set internal allotments to distribute funds among their divisions.
The layered structure exists to keep agencies from burning through a full year of funding in the first few months. OMB monitors spending across the year, and agencies track their own to stay within the apportioned amounts.
The Antideficiency Act
The legal backstop is the Antideficiency Act. Federal employees cannot spend more than their appropriation allows, and they cannot commit the government to pay for something before Congress has appropriated the money. Violations can bring administrative discipline up to removal from office. Knowing and willful violations carry criminal penalties of up to $5,000 in fines and two years in prison.10Office of the Law Revision Counsel. 31 USC Subtitle II, Chapter 13, Subchapter III – Limitations, Exceptions, and Penalties
Funding Gaps and Shutdowns
When Congress fails to pass one or more appropriations bills by October 1 and no continuing resolution is in place, the affected agencies hit a funding gap. Because the Antideficiency Act bars them from spending without authority, non-essential operations shut down.
A continuing resolution is the usual workaround. It provides temporary funding, typically at the prior year’s levels, while negotiations continue, and it usually bars agencies from starting new programs that weren’t funded the year before.11Congress.gov. Continuing Resolutions: Overview of Components and Practices A CR can last a day or the rest of the fiscal year.
When even a CR fails, the result is a shutdown. Essential personnel, including military service members, air traffic controllers, TSA officers, and law enforcement, keep working without pay. Other federal employees are furloughed. More than 20 funding gaps have occurred since the modern budget process began in 1976. Most lasted only days; the longest have stretched beyond a month.
Phase 4: Audit and Review
The final phase closes the loop. After the money is spent, independent reviewers examine whether it was used legally, efficiently, and effectively, and the findings feed straight into the next round of formulation.
The Government Accountability Office
The GAO, often called the “congressional watchdog,” is a nonpartisan agency in the legislative branch. It has audited the federal government’s consolidated financial statements every year since fiscal year 1997, checking whether agencies presented their finances fairly, maintained effective internal controls, and complied with the law.12U.S. Government Accountability Office. Federal Financial Accountability GAO also evaluates program effectiveness and flags waste across the government, sending its reports to Congress for use in oversight and appropriations decisions.
Inspectors General
Nearly every federal agency has its own Inspector General, a role created by the Inspector General Act of 1978. IGs are appointed by the President, confirmed by the Senate, and chosen on professional qualifications rather than political affiliation. They report to the agency head but cannot be blocked from initiating or completing any audit or investigation.13Department of Defense Inspector General. Inspector General Act of 1978 They audit programs, investigate fraud and mismanagement, and recommend corrective actions inside their agencies.
The Annual Financial Report
Each year, Treasury, working with OMB, publishes the Financial Report of the United States Government. It consolidates the audited financial statements of individual agencies into a single picture of the government’s assets, liabilities, revenues, costs, and long-term fiscal outlook.14U.S. Department of the Treasury – Bureau of the Fiscal Service. Financial Report of the United States Government GAO audits that consolidated report, and any material weaknesses it identifies become priorities for agency management and congressional oversight when the cycle starts again.