Jails are funded primarily by the county or city that operates them, with local property taxes and general fund allocations covering most of the bill. That local money is supplemented by state per diem payments for housing sentenced state inmates, competitive federal grants, contracts to hold detainees for the U.S. Marshals Service, ICE, or neighboring counties, and fees charged to incarcerated people and their families. Unlike state prisons and federal penitentiaries, jails sit on local budgets, so the tax base of a single county or city largely determines how well a facility runs.
Local Taxes and the County Budget
Property taxes are the most reliable funding source for jail operations nationwide. Local governments assess residential and commercial real estate, and the revenue flows into a general fund covering all public services. County commissioners or city councils then decide during the annual budget cycle how much of that general fund the jail gets. Sales tax revenue adds a secondary layer, though it swings with consumer spending in ways property tax collections generally do not.
The sheriff or jail administrator submits a formal budget request each fiscal year, laying out projected costs for staffing, food, medical care, utilities, and maintenance. Elected officials weigh that request against schools, roads, social services, and every other function drawing from the same pool. Jails often lose ground here. A school district can point to enrollment; a road department can point to measurable infrastructure needs. Jail budgets rise and fall with arrest rates, sentencing trends, and pretrial detention practices that local leaders have limited ability to predict or control.
When the general fund cannot keep up, jurisdictions ask voters to approve dedicated tax levies. These ballot measures propose a specific millage rate increase tied to jail construction, renovation, or operations. Tying the tax to a defined purpose reassures voters and produces a revenue stream that cannot be diverted elsewhere. The levies typically run for a fixed period, and rates vary widely with the scope of the project and the local tax base.
State Per Diem Payments
States pay local jails to house people who have been sentenced to state prison time. When state prison systems run overcrowded, corrections departments contract with counties to hold sentenced inmates at a daily rate rather than build new state facilities. Those daily rates vary enormously from one state to another, and many jurisdictions have long complained that the reimbursement falls short of what it actually costs to house, feed, and provide medical care to these inmates. When a state’s payment covers only a fraction of the true expense, local taxpayers quietly subsidize what should be a state obligation.
Federal Grants
Federal support flows mainly through competitive grants administered by the Department of Justice, particularly the Bureau of Justice Assistance.1United States Department of Justice. Grants These grants are almost always earmarked for specific improvements rather than general operations. A county might receive funding to launch substance abuse treatment, implement mental health screening at intake, or build reentry services for people leaving custody. The BJA’s Smart Reentry Demonstration Program, for example, awards up to $1 million per grantee to develop strategies for reducing recidivism after release from jail or prison.2Grants.gov. BJA FY25 Smart Reentry Demonstration Program
Many federal grants require a local cash match, often around 25% of total project cost. A county that can barely afford to keep the lights on may not have the spare funds to put up a match, which means the jurisdictions that need help most are sometimes the least able to qualify for it. Grant categories also shift with political priorities, so it is risky for a jail to build ongoing programs around grant dollars alone.
Housing Contracts With Other Agencies
One of the more straightforward revenue sources is renting empty beds to other government agencies. Through intergovernmental agreements, the U.S. Marshals Service contracts with local jails to hold federal pretrial detainees awaiting trial or transport to a Bureau of Prisons facility. Roughly 1,200 of these agreements exist across the country. Immigration and Customs Enforcement uses local jail space through its own contracts or by piggybacking on existing Marshals Service agreements.
Per diem rates in these contracts vary widely. A rural jail with low operating costs might accept $30 per day, while a facility in a high-cost metro area might negotiate $90 or more. For a jail with significant unused capacity, these payments can become a meaningful budget supplement and even generate a surplus beyond the direct cost of the beds being used.
Local facilities also house inmates from neighboring counties dealing with overcrowding or facility closures. A county with a newer or larger jail charges the sending county a daily rate to hold overflow. The risk is real: the contracting agency sets standards the jail must meet, and losing a contract for compliance failures can blow a hole in a budget that officials were counting on to cover salaries and operating costs.
Fees Charged to Inmates and Their Families
Many jails charge the people they incarcerate for the cost of their own detention. At least 43 states have authorized some form of pay-to-stay fee, where inmates are billed a daily rate for housing and meals that commonly runs from $20 to $80 per day. The charges accumulate during the entire period of incarceration, and the debt follows people after release. Most of it is never collected. Data from one state’s criminal justice debt system showed collection agencies recovered only about 10% of outstanding balances after referral.3Consumer Financial Protection Bureau. Justice-Involved Individuals and the Consumer Financial Marketplace As a revenue source, pay-to-stay fees generate more unpayable debt than actual income.
Phone calls and video visits have been another revenue channel, though the economics are shifting. Jails have historically contracted with telecommunications vendors who charge inmates and their families for every call and video session, then share a percentage of the revenue with the facility. The FCC has described these commission payments as “a division of locational monopoly profit,” and in some cases the commissions reached 40% or more of total calling revenue.4Federal Communications Commission. Rates for Interstate Inmate Calling Services Federal regulation is now squeezing that income. Under the Martha Wright-Reed Act, the FCC set interim per-minute rate caps ranging from $0.08 to $0.17 for audio and $0.17 to $0.42 for video depending on facility size, with a compliance date of April 6, 2026.5Federal Communications Commission. Incarcerated Peoples Communication Services, Implementation of the Martha Wright-Reed Act, Rates for Interstate and International Incarcerated Peoples Communication Services The FCC has also proposed retaining the outright prohibition on site commission payments it first adopted in 2024.6Federal Communications Commission. Incarcerated Peoples Communication Services, Implementation of the Martha Wright-Reed Act, Rates for Incarcerated Peoples Communication Services
Commissary sales round out the internal economy. Jails sell snacks, hygiene products, writing materials, and other items at marked-up prices, and the profits are supposed to flow into an inmate welfare fund used for library books, recreational equipment, and chapel services. In practice, oversight is often minimal, and investigations in multiple jurisdictions have found welfare fund dollars spent on staff perks and law enforcement equipment unrelated to the incarcerated population. Some states have tightened restrictions on how these funds can be used, but enforcement remains uneven.
Where the Money Goes
Understanding the funding side means seeing where the money actually gets spent, because two categories dominate every jail budget and drive the endless push for more revenue.
Personnel is the biggest line item, often 70% or more of operating spending, and in some jurisdictions well over 80%. Salaries, health insurance, retirement contributions, and overtime pay for correctional officers, nurses, administrative staff, and kitchen workers add up fast. The local jail workforce has declined roughly 7% since 2020, and facilities that cannot fill positions rely on mandatory overtime at 1.5 times the base rate. A jail operating at half its authorized staffing can burn through its personnel budget months before the fiscal year ends.
Healthcare is the fastest-growing pressure point. Some jails now spend a third of their budget on medical services, covering chronic disease management, mental health treatment, emergency room visits, and prescription medications. A gap in federal Medicaid law makes the local burden heavier: under 42 U.S.C. ยง 1396d, federal Medicaid dollars generally cannot pay for care provided to inmates of public institutions, with narrow exceptions for inpatient hospital stays and certain juvenile services.7Office of the Law Revision Counsel. 42 USC 1396d – Definitions When someone on Medicaid gets booked, federal payment for their healthcare stops and the county picks up the full tab. Given jail populations with disproportionately high rates of mental illness, substance use disorders, and chronic conditions, the cost shift is substantial.
Lawsuits are the third pressure. Civil rights litigation over inadequate medical care, excessive force, or dangerous conditions can produce settlements and verdicts running into the hundreds of thousands or millions. Counties that self-insure pay directly from the general fund; those with liability insurance have seen premiums climb sharply as claims have increased, and some jurisdictions have watched their jail-related insurance premiums triple over a span of just a few years. The cost of defending poor conditions often exceeds what it would have cost to fix them.