Public schools in the United States are funded substantially from local property taxes. The arrangement is old, deliberate, and the source of continuing legal argument.
The structure is historical
Schools were established locally long before states built substantial education bureaucracies, and communities funded them from the most visible local asset available: land and buildings.
Property was practical to tax because it cannot be moved or hidden, and its ownership was already recorded for other purposes.
The system persisted as districts formalised, and the link between a district's property wealth and its school budget was carried forward largely intact.
Assessment and rate are separate levers
The tax owed on a property is its assessed value multiplied by a rate. Districts control the rate; assessment is generally handled by a separate county function.
A district with low property values must set a higher rate to raise the same revenue per pupil as a wealthier district raising it at a lower rate.
This is the core of the equity problem. Comparable tax effort produces very different revenue depending on what the district has to tax.
States equalise, partially
Most states supplement local revenue with formulas that direct more state money to districts with less capacity to raise their own.
Formulas often weight for student characteristics as well, allocating additional funding for pupils who cost more to educate, such as those learning English or with disabilities.
How completely these formulas close the gap varies enormously between states, and the answer changes as legislatures revise the formulas.
Courts have been involved for decades
Litigation over school funding has run in state courts for many years, generally arguing that funding disparities violate education provisions in state constitutions.
Some cases have produced court-ordered changes to funding formulas; others have failed, with courts holding the question belongs to the legislature.
Because the claims rest on state constitutional language, outcomes differ from state to state even where the underlying facts look similar.
The link shapes housing decisions
Because school quality is tied to district boundaries, families weigh school assignment when choosing where to buy, and that demand is reflected in home prices.
Higher prices raise the assessed base, which raises district revenue, which supports the schools that attracted the buyers in the first place.
That feedback loop is why funding reform is politically difficult: changing the link would alter property values, and homeowners have already paid for the current arrangement.