Ohio’s earned-income-only school district income tax is a local tax that applies solely to wages and net self-employment profit. Retirement income, investment income, and most other passive sources are not taxed. Of the 214 Ohio school districts that levy an income tax, 68 use this earned-income base, with rates set by voters between 0.25% and 2.00%.1Ohio Department of Taxation. School District Tax Year 2026 The remaining districts use a broader “traditional” base that reaches nearly all income, so the first thing to confirm is which base your district uses.
What Counts as Earned Income
Two categories are in: employee compensation and net self-employment earnings. Employee compensation means wages, salaries, tips, bonuses, commissions, and similar pay as reported in Box 1 of your W-2. These are gross figures, before deductions for benefits or retirement contributions.2Ohio Department of Taxation. Income – School District Tax – Section: 8 How Is the School District Tax Calculated?
Self-employment income means profits from a sole proprietorship and your share of net earnings from a partnership, but only to the extent those amounts flow into your modified adjusted gross income (MAGI). If a portion of your earned income is excluded from MAGI for some other reason, it drops out of the school district calculation too. You report these figures by completing lines 30 through 39 on the SD 100 rather than copying a single line from your federal or state return.3Ohio Department of Taxation. Guide to Ohio’s School District Income Tax
Military pay has its own rule. Ohio residents on active duty owe no school district tax on pay and allowances earned while stationed outside Ohio, but active duty pay earned while stationed inside Ohio remains taxable. Nonresidents owe no school district tax on military compensation.4Ohio Department of Taxation. Employee’s Withholding Exemption Certificate IT 4
What’s Left Out
The reason districts choose this base is the long list of income it ignores:
- Interest, dividends, and capital gains
- Pensions, annuities, IRA distributions, and Social Security
- Unemployment compensation
A resident whose only income is a pension and Social Security owes nothing in an earned-income-only district.2Ohio Department of Taxation. Income – School District Tax – Section: 8 How Is the School District Tax Calculated?
One point trips up business owners. Distributive shares from an S-corporation are not earned income for this tax, so they stay off the SD 100 entirely in an earned-income-only district. The traditional base does tax those distributions, which is why the same shareholder living in a traditional-base district would owe tax on them. Partnership income treated as net self-employment earnings is still in.3Ohio Department of Taxation. Guide to Ohio’s School District Income Tax
Who Owes It and How to Find Your District
You owe this tax if you are domiciled in a taxing district, or if you live there and keep a permanent place of abode there during any part of the year. Even a few months of residency can create a filing obligation, provided you actually received income during that stretch and the calculation produces a liability.5Ohio Legislative Service Commission. Ohio Code 5748 – 5748.01 School District Income Tax Definitions6Ohio Department of Taxation. School District Income Tax
Every taxing district has a unique four-digit code, and you need it to file correctly and to set up withholding. The Ohio Department of Taxation’s online lookup, The Finder, takes an address or GPS coordinates and returns your district along with the base type it uses.7Ohio Department of Taxation. The Finder Using the wrong code sends your return to the wrong district and can trigger underpayment notices while the error is corrected.
Rate and Credits
Your district’s voter-approved rate applies as a flat percentage to your taxable earned income. The earned income base does not allow personal exemptions to reduce the amount before the rate is applied, and the joint filing credit, retirement income credit, and childcare credit are not available against this tax. A $50 senior citizen credit exists under the school district income tax generally.3Ohio Department of Taxation. Guide to Ohio’s School District Income Tax
Paying the Tax
The simplest route is employer withholding. You authorize it by filling out the school district section of Ohio Form IT 4, listing your four-digit district number and name, and giving the form to your employer. If you move to a different taxing district mid-year, submit an updated IT 4 with the new code.4Ohio Department of Taxation. Employee’s Withholding Exemption Certificate IT 4
Withholding is not required of employees, but if you skip it and your liability after credits will top $500 for the year, you must make quarterly estimated payments using Form SD 100ES. The safe harbors are the usual ones: cover at least 90% of this year’s liability or 100% of last year’s. Missing a quarterly deadline triggers interest from that installment’s due date forward.8Ohio Department of Taxation. 2026 School District Estimated Income Tax Instructions
If you moved into or out of a taxing district during the year, you owe only on earned income received while you were a resident there. The SD 100 includes a residency schedule for listing each district, the dates, and the days spent in each, and a single consolidated return now handles multiple districts on one form.9Ohio Department of Taxation. 2025 Ohio SD 100 School District Income Tax Return
Filing the SD 100
The return is Ohio Form SD 100, filed separately from the Ohio IT 1040 but sharing the same April 15 deadline.10Ohio Department of Taxation. Due Dates You can file electronically at no cost through the OH|TAX eServices portal.6Ohio Department of Taxation. School District Income Tax
A federal extension on IRS Form 4868 automatically extends the SD 100 deadline. Check the extension box on the SD 100 and attach a copy of the federal form. The extension gives you more time to file but not to pay, and interest runs on any unpaid balance from April 15.11Ohio Department of Taxation. Ohio’s Individual and School District Income Tax Filing Extension
Late filing carries a penalty of $50 per month, up to $500, and it applies even when the return shows a refund. Skipping the return because you expect money back still costs you. Unpaid balances accrue interest at 3%, and the late payment penalty equals double the interest owed.12Ohio Department of Taxation. Ohio School District Income Tax Failure to File Notice