The jurisdictional base is residence and only residence, and that is the species-level difference from the wider category of a local income tax. Ohio defines a resident of the school district as an individual who is a resident of the state "during all or a portion of the taxable year and who, during all or a portion of such period of state residency, is domiciled in the school district or lives in and maintains a permanent place of abode in the school district." Set that beside the municipal income tax, whose entire occasional entrant exemption exists because municipalities do tax nonresidents on work performed inside them. A person can commute into a school district every working day for forty years and owe it nothing, while owing the city they work in from day twenty-one.
The second surprise is that the base itself is a choice, made when the levy is written. Section 5748.01(E) gives two options, and the resolution imposing the tax picks one. The first is "modified adjusted gross income for the taxable year ... less the exemptions provided by section 5747.025," which is effectively all state-taxable income. The second is "wages, salaries, tips, and other employee compensation ... and net earnings from self-employment, as defined in section 1402(a) of the Internal Revenue Code."
The consequence is direct: a retiree living on a pension, Social Security and investment income owes nothing at all in a district that chose the second base and owes the full rate in a district that chose the first. Two neighbors a mile apart, with identical incomes and identical nominal rates, can face completely different bills. Ohio also blocks the obvious workaround. Section 5748.02(E) prevents a board from asking voters for a tax on one of those bases where it would be in addition to an existing tax on the other.
Adoption runs through the ballot box, not the board alone. A board of education first asks the state tax commissioner to certify a rate estimate, then may adopt a resolution proposing the tax at the certified rate "rounded to the nearest one-fourth of one per cent," for a fixed number of years or for a continuing period, taking effect on "the first day of January of any year following the year in which the question is submitted." The resolution goes to the county board of elections and the proposal is put to the district's electors as a separate question. A board may not put the question to voters more than twice in a calendar year.
Liability is measured by the months you lived there, not by the year. School district income is defined as the portion of taxable income received "during the portion of the taxable year that the individual is a resident of the school district and the school district income tax is in effect in that school district," and the statute adds that an individual may have school district income with respect to more than one district. Moving mid-year splits the year rather than picking a side.
A small credit for older taxpayers has sat in the chapter, unamended, since 1989. Section 5748.06 allows a taxpayer aged sixty-five or older during the taxable year a credit of fifty dollars against the tax for each return required to be filed, capped at the tax otherwise due. The figure is not indexed and has not moved.
Identifying your own district is the practical difficulty, and the state publishes the answer. School district boundaries do not follow municipal or county lines, and a mailing address is not evidence of which district a house sits in. The Ohio Department of Taxation runs an address lookup, The Finder, which returns the district number and its rate; a rate of zero means the district levies no income tax and no return is due. Getting the district wrong on the return sends money to the wrong place or to no place at all.
The return has a name, and it is separate from the state return. Ohio's school district income tax return is the SD 100. The department collects and administers the tax on behalf of the districts, and states that school district income tax returns "are subject to the same requirements and procedures as the Ohio individual income tax return." A resident can owe school district income tax while owing no state income tax, in which case both the SD 100 and the state return are filed.