Local governments in the United States are funded by state transfers through several distinct channels: formula-based revenue sharing that arrives as general-purpose money, categorical grants tied to specific programs, block grants that fund a policy area with some flexibility, federal dollars passed through the state, and reimbursements for state-imposed mandates. In 2021, local governments received roughly $546 billion directly from state treasuries, covering everything from teacher salaries to road repairs. Each channel carries its own rules about how the money can be spent and what the local government must report back, and understanding the differences is what separates a city budget that survives an audit from one that does not.
Why States Send Money Down at All
Local governments are legally creations of their state. Under Dillon’s Rule, a local government possesses only the powers its state legislature expressly grants. Even in home rule states that give cities broader authority, the state retains ultimate control over which fiscal tools local officials can use. A city cannot simply invent a new tax to cover a budget shortfall. It needs state permission, and permission often comes with conditions.
That legal reality drives the funding relationship. States collect broad-based taxes (sales, income, excise) more efficiently than any single city or county could, because economic activity crosses local lines constantly. A commuter who works in one city and shops in another generates revenue no single local government could fully capture. Pooling the money at the state level and pushing portions back down means the community where residents actually live and use services gets a share of what those residents generate elsewhere.
The policy goal is fiscal equalization. A wealthy suburb and a struggling rural county sit in the same state with property tax bases that look nothing alike. Without redistribution, the suburb would enjoy well-funded schools and parks while the rural county scraped by. States use transfer formulas to close that gap. Education is the clearest case: states supplied 46 percent of all elementary and secondary education funding nationally in 2021, compared with 44 percent from local sources and 11 percent from the federal government.1Urban Institute. State and Local Expenditures
Formula-Based Revenue Sharing
The largest category of unrestricted state transfers moves through mathematical formulas that weigh each community’s needs and resources. These formulas generally use three factors: population (how many people need services), income (how much revenue the local economy can generate), and tax effort (how aggressively the local government is already taxing its own residents).2U.S. GAO. Revenue Sharing Formulas – An Assessment and Framework for Further Research Some states add variables like assessed property values or the number of road miles a county maintains, but the core logic is consistent: communities with more people, less wealth, and higher existing tax rates get a bigger share.
Money distributed this way is general-purpose. Local officials decide how to spend it based on their own priorities. A city council might direct formula revenue toward police salaries one year and infrastructure the next without seeking state approval for each decision. State auditors still review spending to catch diversion to prohibited uses, but the default is local discretion, and that flexibility is the defining advantage of formula sharing.
States recalculate distributions periodically using updated census data and property assessments. Because the formulas rely on data that shifts with population and economic conditions, a fast-growing suburb might see its share climb while a shrinking rural town gets less. The lag between real-world change and the next data update creates temporary mismatches, which is why some states use estimated population figures between full census counts.
Categorical Grants and the Strings They Carry
Categorical grants are the opposite of general-purpose funding. The state attaches detailed conditions specifying what the money must be used for, and local officials have little room to deviate. A grant earmarked for bridge inspection cannot be redirected to hire librarians, no matter how badly the library needs staff. These grants exist because the state wants to guarantee uniform implementation of certain priorities: education standards, public health programs, transportation safety.
Categorical grants impose the most constraints on recipients. They typically require specific administrative procedures, detailed expenditure reports, and performance audits proving the money went where directed.3Library of Congress. Federal Grants to State and Local Governments – Trends and Issues Falling out of compliance can mean the state withholds future payments or demands repayment. The reporting burden is real: local finance officers spend significant time tracking categorical dollars separately from general revenue, because mixing them up even accidentally can trigger audit findings.
Many categorical grants require a local match, meaning the city or county must contribute a percentage of the project cost from its own funds. Match rates vary widely, but 10 to 25 percent is common. The match ensures the local government has something at stake and stretches state dollars further by leveraging local contributions.
Maintenance of Effort Requirements
Some categorical grants include “maintenance of effort” clauses that prevent a local government from pocketing state money and cutting its own spending by an equal amount. State funds are meant to add to local spending, not replace it.4SAMHSA. A Primer on Maintenance of Effort Requirements Under a typical rule, the local government must show its own contribution stayed at or above the prior year’s level. If spending drops, the jurisdiction risks losing eligibility entirely.
Block Grants as a Middle Ground
Block grants sit between unrestricted formula sharing and tightly controlled categorical grants. They fund a broad functional area, such as community development or public safety, but let local governments choose which specific activities within that area to support.3Library of Congress. Federal Grants to State and Local Governments – Trends and Issues A public health block grant might allow a county to choose between expanding clinic hours and launching a vaccination outreach campaign. Reporting is less burdensome than under a categorical grant but more demanding than general-purpose sharing.
Federal Money That Comes Through the State
A substantial portion of what looks like state aid actually originates federally. The federal government sends money to state agencies, which then distribute it to cities, counties, and school districts. Education funding is the most prominent example. Transportation, Medicaid, and public safety grants follow similar paths. The state acts as a fiscal intermediary, adding its own compliance requirements on top of the federal ones.
Local governments that spend $750,000 or more in federal awards during a fiscal year, including these pass-through funds, must undergo a Single Audit.5eCFR. 2 CFR 200.501 – Audit Requirements The Single Audit evaluates whether the jurisdiction spent federal dollars in line with program requirements and reported expenditures properly. Smaller communities that rarely handled significant federal money before the pandemic discovered this obligation the hard way when American Rescue Plan Act funds pushed them over the threshold. The audit requires the local government to prepare a detailed schedule of all federal expenditures and hire an independent auditor, which adds real cost and administrative burden.
Layered federal and state requirements on pass-through funds create a compliance challenge that general-purpose state revenue sharing does not. A single grant dollar might be subject to federal spending rules, state reporting deadlines, and local budget procedures at the same time. Local finance officers track those dollars in separate accounting codes and keep records sufficient to satisfy auditors at every level. For small towns with lean staffs, this overhead can eat a meaningful share of the grant itself.
Reimbursement When the State Imposes a Mandate
When a state legislature passes a law requiring local governments to provide a new service or meet a higher regulatory standard, the cost of compliance falls on local budgets unless the state provides funding. A majority of states have adopted constitutional or statutory protections against unfunded mandates. These provisions generally require the state to reimburse local governments for the cost of implementing state-imposed requirements.
Reimbursement typically works after the fact. The local government implements the mandated program, documents its costs, and files a claim with a designated state agency. Claims must be supported by financial records showing what the community actually spent. Some states simplify the process by reimbursing based on cost formulas or estimates rather than receipt-by-receipt documentation.
The teeth of these protections matter more than their existence on paper. In some states, a local government that does not receive timely reimbursement can seek a court order excusing it from compliance until the state pays. In others, the state must either fund the mandate in its annual budget or suspend the requirement. That fiscal note attached to every new mandate makes legislatures think twice before imposing expensive obligations. Enforcement varies, though. Some states have well-established claims processes and commissions that resolve disputes efficiently. Others have protections that look strong in the state constitution but prove hard for local governments to actually invoke.
When State Revenue Drops, Local Budgets Feel It
The biggest vulnerability in the transfer system is that local budgets end up dependent on revenue the local government does not control. When a recession hits and state sales and income tax collections fall, the legislature faces pressure to cut aid to local governments to balance its own books. During the Great Recession, widespread state cutbacks in local aid compounded the revenue losses local governments were already experiencing from the housing bust.6Brookings Institution. State and Local Budgets and the Great Recession Cities that built their budgets around predictable state transfers suddenly faced shortfalls they had no quick way to replace.
Recent data confirms the volatility. State tax revenue surged 19.4 percent in fiscal year 2021 and another 16.2 percent in fiscal 2022, then declined 3.4 percent in fiscal 2023 before rising a modest 3.3 percent in fiscal 2024.7The Pew Charitable Trusts. State Tax Revenue Volatility Remains High as Long-Term Trends Moderate Swings that large in the state revenue stream translate directly into uncertainty for local governments waiting on their share. Pandemic disruptions, federal policy changes, inflation, and stock market movement all contributed.
The practical implication for local budgeting is straightforward. State transfers are never guaranteed at last year’s level, so treating them as somewhat uncertain and holding local reserves against potential cuts is more prudent than assuming the checks will keep arriving unchanged. That caution applies to every category above: formula distributions, categorical and block grants, pass-through federal dollars, and even mandate reimbursements can all move when the state’s own fiscal picture shifts.