The corpus › Metric

Effective Operating Millage

The property tax rate a district actually levies for current operating expenses after H.B. 920 reduction factors, as distinct from the rate its voters approved. The gap between the two is the entire H.B. 920 mechanism expressed as a number.

metric/effective-operating-millage · 1 node point here

Ohio reports it separately for Class 1 property (residential and agricultural) and Class 2 (all other), because reduction factors are computed per class and the two diverge as residential and commercial values move differently. A district can be at the floor for one class and above it for the other, so “the district’s effective millage” is not a single quantity and any analysis must say which class it means. verified

This metric exists chiefly to determine floor status, which is a regime switch rather than a continuous variable — see Twenty-Mill Floor. Above the floor, valuation growth on existing property does not reach revenue; at the floor it passes through directly. Partitioning districts on this metric is the precondition for any credible statewide property tax analysis. inference

The statewide picture, TY2023, Class 1, all 606 traditional districts verified: median 23.40 mills, maximum 84.29, with 170 districts at exactly 20.000 and 233 within half a mill of it. The distribution is therefore bimodal in effect: a large cluster pinned at the floor and a long right tail of districts whose voters have approved far more than reduction factors have taken away.

The spread in voted millage is far wider than the spread in effective millage, which is the mechanism doing its work: Upper Arlington’s voters approved 112.76 mills and the district levies 37.09; Northern Local’s approved 31.35 and it levies exactly 20. verified Reduction factors compress the top of the distribution and the floor holds up the bottom.

Properties

NameEffective operating millage
Unitmills
Definitioneffective_operating_millage = voted current operating millage x reduction factor, subject to a statutory floor of 20 mills for city, local, and exempted village districts and 2 mills for joint vocational school districts, where the floor cannot raise a rate above the voted rate.

Computed and reported separately for Class 1 (residential and agricultural) and Class 2 (all other real property). A figure without its class is not usable.
InputsCurrent operating millage and effective Class 1 and Class 2 millage by district and tax year — FY2024 District Profile Report, and tax-abstract for the underlying abstracts. Table SD-1 for TY2021-TY2024, Table SD-1 — School district taxable value and taxes charged, for the series.
Values over time
Table SD-1's effective operating rates over all 611 school districts the abstract carries, in every tax year it holds verified crates/dispersion/src/sd1.rs:
            Class I median   Class II median   at 20.00   within 0.5 of 20
  TY2021        24.91            29.33            102           171
  TY2022        24.56            28.67            137           180
  TY2023        23.31            27.46            172           232
  TY2024        22.80            26.26            155           240
"At 20.00" is a Class I rate that reads 20.00 to the hundredth, because the abstract publishes some years to two decimals and others to four; "within 0.5" counts either side of the floor. Both medians fall in every year and the band around the floor fills in every year. The count exactly on it does not: it falls by seventeen in TY2024 while the band gains eight. verified A falling median over a filling band is what reduction factors do while values rise — they take rates down until the floor stops them. inference

The TY2023 row is not the profile report's picture in the description (606 districts, median 23.40, 170 at 20.000, 233 below 20.5). SD-1 carries five more districts, and that 233 counts everything under 20.5, where the band here is two-sided. verified
CaveatsClass 1 and Class 2 rates differ and are not interchangeable.

Five districts in the FY2024 report show an effective rate marginally above their voted rate — up to 0.0004 mills — which is published rounding, not a data error. A validity check with too tight a tolerance rejects good rows. verified

Fourteen districts report effective Class 1 rates just below 20 mills despite having voted between 23 and 48. Two candidates were named for it and both are now disconfirmed. The pre-1982 joint vocational taxes that R.C. 319.301(E)(2) combines with a district's own current-expense taxes are in the section and the corpus's model does omit them — that much still holds, at crates/project/tests/the_term_the_floor_model_omits.rs. But the term belongs to a district's joint vocational district and so binds every member of it alike. Anna Local sits on the floor while Botkins, in the same joint vocational district, sits 0.0705 mills below, and six of the districts below the floor are in no joint vocational district at all. Rounding inside the reduction-factor computation fails for a separate reason: R.C. 319.301(D)(1) recomputes the percentage annually, and seventeen districts are below the floor in all four tax years. verified see Twenty-Mill Floor and crates/dispersion/tests/the_neighbour_that_sits_at_exactly_twenty.rs

What holds is the bound: no district that voted twenty sits more than three tenths of a mill below it, and every district more than half a mill below never voted twenty. The cause is unexplained, and what is known about it now is that it is stable per district rather than a fresh error each year. open

Tax year and fiscal year are offset; the FY2024 report carries TY2023 millage.
Calculatormillage

Where this appears on the site

The pages outside the corpus that link here, and the section of each the link sits in.

CompareIn “Side by side”.
Cleveland MunicipalIn “Where the state aid comes from”. The same link is on 588 of the 609 pages like this one.
Cleveland Municipal — TaxesIn “What voters approved, and what the factors left”. The same link is on 606 of the 609 pages like this one.