What One More Student Actually Costs
Last spring I wrote a piece on this site arguing that Edgecomb's tuition-in students bring in more than they cost — that the right way to judge them is not the school's average cost per student, but the marginal cost of filling a seat in a classroom that already exists. Several readers asked the fair follow-up: fine, but how much more, exactly? What does one more student actually cost?
So I built the model. Every assumption is on the table, and the model itself is available to anyone who wants to check the arithmetic. Here is what it shows.
First, the two numbers that get compared — wrongly.
Edgecomb Eddy currently enrolls 108 students: 77 who live in Edgecomb and 31 tuition students from towns that don't operate an elementary school. Each tuition student pays the tuition rate set by the state — $18,812.53 for Edgecomb in the most recent published rate year. The claim circulating against tuition students takes the school's average cost per pupil — about $31,502, the whole budget divided by enrollment — subtracts the tuition, and calls the roughly $12,689 difference a loss on every student.
The flaw is in the average. That $31,502 includes the building, the heat, the principal, the debt payments, and every teacher's salary — costs that are identical whether a given seat is filled or empty. Charging a new student a share of costs that don't change isn't accounting; it's just division. The honest question is narrower: when one more student sits down in an existing classroom, with no new teacher hired, what spending actually goes up?
What actually changes: about $500 a year.
Going line by line through what a school buys per student, the list is short: workbooks and classroom supplies (about $200), per-seat software licenses ($60), testing fees ($25), a share of activities and field trips ($75), health-screening consumables ($15), the net cost of school meals after families and the state and federal programs pay their parts ($50), a little more water, power, and cleaning ($50), and registration and records processing ($25). Call it $500, with honest ranges on each line — these are modeled estimates, and the school business office's ledger would tighten them. What is not on the list matters more: no salary, no benefits, no building, no bus. Those are already bought.
The one real wildcard: special education.
Candor requires this section. A tuition student with significant special needs can cost far more than the tuition rate — that's true, and any honest model has to face it. Maine law, however, was written for exactly this: the sending town pays the regular tuition plus a separate special-education tuition for that student's services. Edgecomb's realistic exposure is only the slippage around the edges of that system. Modeled as an expected value across all tuition students — some share needing services, some share of cost unrecovered — it adds about $179 per student in the base case. Even stacking pessimistic assumptions (one in five students needing services, at high cost, with 30% never recovered) adds $900.
The total, and the margin for error.
Add it up: roughly $678 per tuition student per year in the base case — about $21,000 across all 31 students, against roughly $450,000 in tuition revenue. Stack every assumption at its high end simultaneously and the cost reaches $1,950 per student, still barely a tenth of the $18,812.53 each student pays.
That gap is the real finding, because it tells you how wrong the model would have to be to change the answer. For tuition students to merely break even, filling a seat would have to cost $18,812.53 — about 28 times the base estimate. There is no version of a workbook, a software license, and a school lunch that gets there.
Two related traps are worth naming. Dividing the budget's tuition revenue line ($450,000) by 31 students gives $14,516, which is sometimes quoted as if it were the rate. It isn't — the rate is set by the state, and the budget deliberately projects tuition income below the full amount because student populations shift from year to year. That is conservative budgeting, and the town should keep doing it; it just isn't a per-student price. And the model's one real boundary is capacity: it holds as long as no single grade grows enough to require an additional teacher. Enrollment runs about 15 students per grade, with tuition adding four or five — but even if a bulge in one grade forced a hire at roughly $85,000 fully loaded, spread across the tuition students the all-in cost would be about $3,400 per student. The answer survives its own worst case.
The flip side is the part nobody prices.
Run the experiment in reverse. If the 31 tuition students left, Edgecomb would lose about $450,000 in revenue and save about $21,000 in costs. The building, the staff, and the bus routes would remain — and roughly $429,000 more would have to be raised from Edgecomb taxpayers to run the same school for fewer children. Every empty seat concentrates the school's fixed costs on the people who live here. Filled seats spread them.
None of this settles every question about enrollment — class size matters educationally, and capacity is a real planning issue. But the cost argument, the one that says each tuition student loses the town money, has the arithmetic exactly backwards. A tuition student is not a $12,689 loss. On the town's own budget figures, a tuition student is about an $18,000 payment toward costs Edgecomb taxpayers would otherwise carry alone, in exchange for about $700 of new spending.
The model, its assumptions, and its ranges are available to check. That's the standard this conversation should be held to — anybody's numbers, mine included.
John Allen serves on the Edgecomb school board. This series explains how the numbers work; it doesn't advocate for or against any budget. Enrollment, budget, and revenue figures are from Edgecomb's adopted FY26 school budget; the tuition rate is the Maine Department of Education's published elementary tuition rate for Edgecomb (2024–25). The marginal-cost figures are a model built from the stated assumptions, not district ledger actuals.
