A school district income tax is a separate local levy on income that funds public schools, collected on top of federal and state income taxes. Only a handful of states authorize one, and Ohio operates by far the largest system: 210 Ohio school districts imposed the tax as of January 2026, at rates between 0.25% and 2%.1Ohio Department of Taxation. School Districts With an Income Tax as of January 2026 Whether you owe anything depends on where you live, what kind of income you earn, and which tax base your district uses.
Where the Tax Applies
Three states authorize some form of school-funded income tax, and they work differently.
In Ohio, a district can put a standalone income tax on the ballot after its board of education passes a resolution declaring the amount to be raised, and voters approve it at a general election.2Ohio Legislative Service Commission. Ohio Revised Code Chapter 5748 The Ohio Department of Taxation collects and administers it for each district.3Ohio Department of Taxation. School District Income Tax
Iowa uses a surtax rather than a standalone tax. Iowa school districts impose a percentage on top of the taxpayer’s state income tax liability, with the rate set by the state Department of Management based on the district’s revenue needs and authorized by either voters or the district’s board of directors.4Legal Information Institute. Iowa Code R. 701-304.1 – School District Surtax Because the surtax rides on state tax liability, a resident who owes no state income tax owes no surtax.
Pennsylvania authorizes a local earned income tax that municipalities and school districts share, generally capped at a combined 1%, collected through 69 county-wide tax collection districts rather than the state revenue agency. Because it is fundamentally a shared municipal-and-school tax, its filing procedures diverge from Ohio’s model.
Everything that follows applies to Ohio, where the standalone school district income tax is most common and the filing obligations are most involved.
Who Owes the Tax in Ohio
You owe Ohio school district income tax if you lived in a taxing district at any point during the year and had income while you were a resident there.3Ohio Department of Taxation. School District Income Tax “Lived in” means your permanent home. Time spent elsewhere for work or travel doesn’t change your domicile as long as you intend to return.
Every taxing district has a four-digit identification code. You’ll need it to file. The Ohio Department of Taxation publishes a lookup tool called The Finder, and the code also appears on the annual school district list.1Ohio Department of Taxation. School Districts With an Income Tax as of January 2026 The wrong code can send your payment to the wrong district and trigger a delinquency notice, so verify it before you file.
If your district’s rate shows as 0.00% on the published list, it does not have an income tax and you don’t need to file a school district return at all.
Traditional vs. Earned Income Tax Base
Ohio districts fall into one of two categories, and the difference can be worth thousands of dollars a year.
A district using the traditional tax base applies its rate to your modified adjusted gross income minus your exemption deduction. That sweeps in wages, interest, dividends, capital gains, and retirement income. A district using the earned income tax base applies its rate only to wages and net self-employment earnings. Retirement income is not taxable under this method.3Ohio Department of Taxation. School District Income Tax
A retiree living on a pension and investment income in a traditional-base district could owe a substantial amount. The same retiree in an earned-income-base district would owe nothing. On the published district list, earned-income districts are marked with a “(b)” notation next to the rate.1Ohio Department of Taxation. School Districts With an Income Tax as of January 2026 The Finder tool and the Ohio income tax instruction booklet also identify which base your district uses.
For traditional-base filers, the starting point is line 5 of the Ohio IT 1040, entered on line 19 of the SD 100.5Ohio Department of Taxation. Guide to Ohios School District Income Tax For earned-income-base filers, the calculation draws only from wage and self-employment figures already reported on the state return.
Filing the SD 100
The school district return is Form SD 100, due April 15 alongside your federal and Ohio state returns.6Ohio Department of Taxation. Individual and School District Income Tax Filing Season You’ll need your completed Ohio IT 1040, all W-2s, your Social Security number, and the four-digit district code. The SD 100 pulls figures directly from the state return, so complete the IT 1040 first.
Since 2023, Ohio uses a consolidated SD 100 that lets you report multiple districts on one form if you moved during the year. Any school district tax your employer withheld can be applied against your total balance for the year, regardless of which district code the employer used.3Ohio Department of Taxation. School District Income Tax
You can file electronically through OH|Tax eServices for free, or through third-party tax software that supports Ohio school district returns.3Ohio Department of Taxation. School District Income Tax Paper filers mail the return to one of two Columbus addresses depending on whether payment is included:
- No payment enclosed: Ohio Department of Taxation, P.O. Box 182197, Columbus, OH 43218-2197
- Payment enclosed: Ohio Department of Taxation, P.O. Box 182389, Columbus, OH 43218-2389
Payments can be made through OH|Tax eServices or by mailing a check with the Ohio Universal Payment Coupon, available on the Department of Taxation’s forms page.7Ohio Department of Taxation. 2025 Ohio SD 100 School District Income Tax Return
Getting Employer Withholding Right
Ohio employers do not automatically withhold school district income tax. You have to tell them to. The mechanism is Form IT 4, Ohio’s withholding exemption certificate. You enter your four-digit district number on that form and your employer begins deducting the tax from each paycheck.8Ohio Department of Taxation. IT 4 – Employees Withholding Exemption Certificate
Skip the IT 4 or leave the school district section blank and your employer will withhold state income tax based on zero exemptions but nothing for school district tax.8Ohio Department of Taxation. IT 4 – Employees Withholding Exemption Certificate You’ll owe the full year’s tax at filing and may face an interest penalty for underpayment. New employees and recent movers get caught by this most often.
If you move into a taxing district or switch districts mid-year, submit an updated IT 4 to your employer. Pay stubs should reflect the change within a pay cycle or two. Checking the stubs after the update beats discovering the error in April.
Estimated Payments and Safe Harbor
Self-employed residents, retirees with taxable income in a traditional-base district, and anyone without adequate withholding need to make quarterly estimated payments. Submit them electronically through OH|Tax eServices or by mail with the Ohio Universal Payment Coupon.9Ohio Department of Taxation. 2026 School District Estimated Income Tax Instructions
Ohio’s safe harbor rules for school district estimated tax mirror the state rules. You avoid the interest penalty if any one of the following is true:
- Your tax liability minus employer withholding for the current year is $500 or less.
- You paid at least 90% of your current year’s school district tax liability.
- You paid at least 100% of your prior year’s school district tax liability, as shown on your timely filed return.
Each quarterly installment equals 25% of the lesser of the current-year or prior-year figures.10Ohio Department of Taxation. Estimated Income/School District Taxes and the 2210 Interest Penalty If your income fluctuates, paying based on 100% of last year’s liability is often simpler because you know the number upfront.
Penalties and Interest
Ohio imposes three separate consequences for falling behind, and they can stack:
- Late filing penalty of $50 for each month the return is late, up to $500. This applies even if you’re owed a refund, because the obligation is to file, not just to pay.
- Interest on unpaid tax at 3% annually.
- Late payment penalty equal to double the accrued interest.
The filing penalty surprises people most. If you lived in a taxing district and had income, you are required to file even if your tax liability is zero.11Ohio Department of Taxation. Ohio School District Income Tax Failure to File Notice Ignoring a delinquency notice triggers further collection activity.
The estimated tax interest penalty is calculated separately on Form IT/SD 2210, based on each quarterly underpayment and the period it remained unpaid rather than a flat percentage.10Ohio Department of Taxation. Estimated Income/School District Taxes and the 2210 Interest Penalty Staying within the safe harbor thresholds eliminates this for most taxpayers.
Moving Between Districts Mid-Year
When you move from one taxing district to another during the year, you owe tax to each district for the portion of the year you lived there. The consolidated SD 100 handles this on one form: report both districts, enter the dates you lived in each, and calculate the tax due separately for each period.3Ohio Department of Taxation. School District Income Tax Any withholding your employer sent to either district code applies against your total balance.
Keep a record of your exact move-in and move-out dates. The consolidated form requires them, and on audit “sometime in March” isn’t precise enough. A lease, closing statement, or utility activation notice will do.
Moving from a taxing district to a non-taxing district (or leaving Ohio entirely) doesn’t erase what accrued while you lived in the taxing district. Submit an updated IT 4 immediately so withholding stops for the district you left.
Military Members and Remote Workers
Active-duty military members stationed in Ohio but domiciled in another state are not liable for Ohio school district income tax.12Ohio Department of Taxation. Military The Servicemembers Civil Relief Act protects them from being taxed by a state or locality based solely on military assignment. Under the Military Spouses Residency Relief Act, a military spouse can elect to use the service member’s state of legal residence for income tax purposes even if the spouse has never lived there.13Military OneSource. The Military Spouses Residency Relief Act Non-military income earned by a service member, such as rental property income, may still be taxable where it is earned.
Remote work is the other common wrinkle. Ohio sources income to the location where the employee physically performs the work, and Ohio does not apply the “convenience of the employer” rule that a small number of states use to source income to the employer’s office instead. If you work from home in an Ohio taxing district for an employer located elsewhere, your home address controls your school district obligation.