Legislative subcommittee hears deep dive on how Montana calculates K‑12 'base aid' and where the money comes from

The Joint Appropriations Subcommittee on Education on Tuesday heard a detailed briefing from the Office of Public Instruction (OPI) on how Montana's K-12 "base aid" is calculated, the data needed to run the funding formulas and the three main revenue sources that pay those obligations.

Paul Taylor, a school finance official at the Office of Public Instruction, told the committee the presentation was intended as an "educational presentation" about how the budget request for base aid is developed. "Base aid or the base amount for school equity determines the largest state funding support for public school districts," Taylor said.

Why it matters: Base aid drives the single largest portion of state K-12 funding, shapes district budget limits and voting limits, and feeds the guaranteed tax base (GTB) formulas that send property-tax relief to low-wealth districts. Small changes in enrollment counts, special-education reports or state revenue estimates can shift hundreds of millions in how funds are distributed among districts.

Taylor walked legislators through the statutory components that together make up base aid under 20-9-306 and related sections of law. He summarized the principal pieces as: the direct state aid portion, the guaranteed tax base portion, and several 100%-state-paid components created after a past school-funding study (quality educator payments, at-risk payments, Indian education payments, and a data-for-achievement payment). Taylor explained those parts are combined for the biennial House Bill 2 request the OPI submits and that some historically separate line items (for example, special-education allowable-cost payments) are now folded into the base-aid request to provide flexibility and to reduce the chance of mid‑biennium shortfalls.

Key technical details and counting rules

- Enrollment: OPI emphasized that the formulas depend on two official count dates (the first Monday in October and the first Monday in February). Those counts are adjusted into "student count for A and B" by excluding certain students (for example, students under age 5,…