Public schools in the United States are funded by three layers of government working together: state aid, local property taxes, and federal grants. In the 2020–21 school year those sources produced $954 billion combined, with states contributing roughly 46 percent, local governments about 44 percent, and the federal government the remaining 11 percent.1National Center for Education Statistics. COE – Public School Revenue Sources Those shares shift year to year and look very different from one state to another, but the three-layer structure is the same everywhere.
The Three Revenue Sources
State revenue for schools comes primarily from income and sales taxes. It reaches local districts through statutory funding formulas designed to provide a baseline level of support for every school regardless of the wealth of the surrounding community. State funds totaled about $437 billion in 2020–21.1National Center for Education Statistics. COE – Public School Revenue Sources
Local revenue, about $416 billion that same year, comes overwhelmingly from property taxes. Nationally, property taxes account for roughly 83 percent of all locally generated school revenue.1National Center for Education Statistics. COE – Public School Revenue Sources Some districts also collect local sales or income taxes, but property taxes dominate in nearly every state.
Federal funding is the smallest slice and it comes with strings. Federal money arrives as categorical grants, meaning districts cannot spend it as they choose. Each dollar is earmarked: supporting low-income students, funding special education, providing school meals. The federal share spiked during the pandemic because of emergency relief funding. With those programs now expired, the proportion is settling back toward historical levels closer to 8 percent.
How State Funding Formulas Work
Every state distributes money to districts through a statutory formula, and the details of that formula shape how much each school actually receives. The most common approach is the foundation funding model, used in roughly half the states. The state sets a minimum per-pupil spending floor, calculates how much each district can raise locally based on its property wealth, and fills the gap. Districts with weaker tax bases get more state aid; wealthier ones get less.
The goal is equalization. A district sitting on high-value commercial real estate can generate significant revenue with a modest tax rate, while a rural district with low property values might tax residents heavily and still fall short. Foundation funding is meant to level that out. In practice, the floor is often set too low, and wealthier districts can still spend far more by supplementing state aid with locally raised revenue that poorer districts cannot match.
Many states layer weighted student formulas on top of the foundation model. Instead of treating every student as identical for funding purposes, weighted formulas assign a higher dollar value to students who cost more to educate. An English language learner, for example, might carry a weight of 1.49, meaning the district receives 49 percent more funding for that student than for one without additional needs. Special education students typically carry higher weights still. About half the states use a flat additional weight or dollar amount for English language learners, while others adjust it based on proficiency or how long the student has been classified.
Local Property Taxes and the Wealth Gap
Property taxes fund schools through a mechanism called a millage rate. One mill equals $1 in tax for every $1,000 of assessed property value. A home assessed at $250,000 in a district with a 20-mill school tax rate generates $5,000 in school revenue. Multiply that across every taxable property in the district and you get the local contribution.
The math creates a structural inequality that funding formulas only partially offset. A district where the average home is worth $500,000 generates twice the revenue per mill as one where homes average $250,000. Wealthier districts can set lower tax rates and still raise more per student than poorer districts taxing at higher rates. This dynamic is the central tension in school finance and has driven decades of litigation.
Tax increment financing adds a wrinkle. When a city designates an area for redevelopment under a TIF arrangement, property tax growth within that zone is redirected to pay for the development project rather than flowing to schools. The district keeps collecting taxes on the area’s pre-TIF assessed value, but any increase during the TIF period funds the redevelopment. Research on Iowa’s TIF districts found measurable revenue losses for schools, and the effect varies by state depending on whether school districts can opt out or negotiate their participation.
School Bonds and Voter-Approved Levies
Day-to-day operations and long-term construction run on separate financial tracks. Operating levies fund recurring costs: teacher salaries, utilities, textbooks, and transportation. Capital projects like building new schools or replacing aging roofs are financed through school bonds, which function like loans the district repays over many years using a dedicated property tax levy.
Both types typically require voter approval, and that is where school finance gets personal. A bond election asks voters to authorize the district to borrow money and raise property taxes to repay it. Most states require a simple majority, though some set higher thresholds. When a levy or bond measure fails, the consequences hit quickly. Districts may pull from reserves, defer building maintenance, or cut programs and staff. Health services, counselors, and facility upgrades are often the first casualties because they sit outside the core instructional budget that districts protect most fiercely.
Failed levies compound. Deferred maintenance becomes more expensive the longer it is delayed, and program cuts can drive families to neighboring districts, further eroding enrollment and the revenue that follows it. Districts that lose a levy vote often return with a revised proposal at a lower amount, but the gap between what was needed and what passes can take years to close.
Where Federal Dollars Actually Go
Two programs account for the bulk of federal K-12 spending. Title I of the Elementary and Secondary Education Act provides supplemental funding to schools serving high concentrations of students from low-income families. Allocations are based on poverty estimates from the Census Bureau, and within a district, funds flow to individual schools based on the percentage of students eligible for free or reduced-price lunch. Schools where at least 40 percent of students come from low-income families can use Title I funds for schoolwide programs rather than targeting only individual students.2National Center for Education Statistics. Fast Facts – Title I
The Individuals with Disabilities Education Act requires states to provide a free appropriate public education to every child with a disability and provides federal grants to help cover the cost. IDEA’s grants-to-states program accounts for about 92 percent of total IDEA funding.3Congress.gov. The Individuals with Disabilities Education Act (IDEA) Funding The law was designed to cover up to 40 percent of the additional cost of special education, but actual federal funding has never reached that level, leaving states and districts to pick up the rest.
The federal fiscal year 2026 budget request proposed $18.4 billion for Title I grants and $14.9 billion for IDEA grants to states. Those headline programs were preserved or slightly increased, but the same budget proposed consolidating 18 smaller K-12 grant programs into a single block grant and eliminating dedicated funding for 21st Century Community Learning Centers, homeless student education, and rural education grants. The overall Department of Education discretionary budget request was $66.7 billion, a 15.3 percent reduction from the prior year.4Department of Education. Fiscal Year 2026 Budget Summary Budget proposals change through the legislative process, so final appropriations may differ, but the direction signals reduced federal involvement in many supplemental programs districts have relied on for years.
How Districts Spend Their Budgets
Schools are labor-intensive, and their budgets show it. Approximately 80 percent of current spending goes to salaries and benefits for teachers, administrators, counselors, bus drivers, custodians, and other staff. That ratio is roughly double the personnel share in most private-sector organizations, which means budget pressures almost inevitably translate into staffing decisions.
District budgets are divided into categories with different levels of flexibility:
- The general fund is the main operating account, covering instruction, administration, and maintenance. Districts have the most discretion over how these dollars are spent.
- Categorical funds are restricted to specific purposes by the granting authority. Federal Title I dollars, for example, cannot be redirected to cover a general fund shortfall. State categorical grants often carry similar restrictions.
- Capital funds are separated from operations entirely. Bond proceeds and capital levy revenue can only be spent on construction, renovation, and major equipment, not on salaries or supplies.
Instruction consistently accounts for the largest single spending category, covering teacher and instructional aide compensation, classroom supplies, and curriculum materials. Support services like transportation, food service, and facility maintenance claim much of the remainder. The average district spent $18,614 per enrolled student in 2020–21, though that figure ranged from under $10,000 in some states to over $25,000 in others.5National Center for Education Statistics. Fast Facts – Expenditures
How School Choice Shifts the Money
The growth of charter schools, voucher programs, and education savings accounts has reshaped the funding landscape. The common thread is that public dollars follow the student out of the traditional district school, reducing the district’s enrollment count and the revenue tied to it.
Charter schools generally receive per-pupil funding through the same state formula as traditional schools, minus an administrative fee that authorizers retain. That fee typically ranges from 2 to 5 percent depending on the state. In most states, charter schools receive full state and federal per-pupil funding but do not receive local property tax revenue, which is a significant gap in states where local taxes make up a large share of the total.
Voucher and education savings account programs work differently. States fund an account or scholarship that parents use toward private school tuition and approved educational expenses. Recent ESA programs have set per-student amounts ranging from roughly $5,000 to $15,000, depending on the state and the student’s needs. These programs are expanding, with several states launching universal or near-universal eligibility in 2025 and 2026.
The financial strain on districts that lose students comes down to fixed costs. When enrollment drops by 10 percent, total revenue drops by roughly 10 percent, but costs like building maintenance, utilities, debt service, and administrative infrastructure do not decline proportionally. The entire reduction has to come from variable spending like staffing and supplies, which means per-pupil spending on instruction and services actually falls for the students who remain. The math is the same whether students leave for a charter school, a private school, or a neighboring district.
Court Challenges and Public Oversight
School funding has been litigated in 45 of the 50 states, making it one of the most active areas of state constitutional law. Early cases focused on equity: the gap between what wealthy and poor districts could spend per student. After the U.S. Supreme Court ruled in 1973 that education is not a fundamental right under the federal Constitution, advocates shifted to state courts and state constitutional provisions guaranteeing an adequate education.
That shift changed the argument. Equity asks whether every district gets the same resources. Adequacy asks whether every district gets enough resources to meet a defined educational standard, even if that means some districts need more. Plaintiffs have won roughly two-thirds of these cases since 1989, and court orders have led states to overhaul funding formulas, establish pre-K programs, and invest in school construction. Compliance is uneven; legislatures sometimes meet orders minimally, and gains can erode through inflation.
Public participation runs on a separate track and is more immediate. Most states require districts to hold public hearings before adopting an annual operating budget, and many require the proposed budget to be published on the district’s website before the hearing. Some states mandate multiple public meetings spread across different weeks. Beyond hearings, voters exercise direct control through levy and bond elections. Districts are also required to report detailed financial data to their state education agency and to the federal government through the Census Bureau’s Annual Survey of School System Finances, and that data is publicly available for comparison across districts and states.