How an Ohio paycheck works
Ohio withholds state income tax on one thing only: how many exemptions you claim. Filing status does not appear anywhere in the state formula, so a married employee and a single employee on the same salary claiming the same exemptions have the same state tax withheld. Three bands apply, and the lowest is wide enough that a large part of a middle income falls inside it, at a rate far below the top one.
Federal income tax withholding
Federal withholding annualises the wage, subtracts the standard deduction for the filing status on Form W-4 Step 1, applies the graduated schedule for that status, and deducts the dependent credit from Step 3. This page models a W-4 with Steps 2 and 4 blank: one job, no spouse income, no other income, no extra withholding.
Social Security and Medicare
Social Security takes a flat rate on wages up to an annual ceiling that moves each year. Medicare applies to every dollar, and above a fixed threshold the employer withholds the Additional Medicare tax on the excess.
Exemptions, and why the default is zero
Each exemption takes a flat amount off the annual wage before the bands apply. The state exemption certificate allows one for yourself, one for a spouse who is not claimed elsewhere, and one for each dependant. Where an employee has not filed the certificate at all, the employer is required to withhold as though zero exemptions were claimed, which is why this page starts there rather than at one.
Because an exemption reduces taxable wages rather than the tax itself, each one is worth the band rate that applies to your top dollar. That is a few tens of dollars a year, not hundreds.
The tables changed partway through the year
Ohio's current withholding tables carry an effective date partway through this tax year, and this page uses them. Different tables were in force before that date, so a payslip from earlier in the year need not match what is shown here. The state's published tables give the effective date and say nothing about how pay already made is treated, so this page does not assume either way. The annual return settles what was actually owed.
Local income tax
This is the part of an Ohio paycheck this calculator cannot show, and it is not a small one. Several hundred municipalities levy their own income tax, and many school districts levy a second one on top. Municipal tax generally follows where you work as well as where you live, with a credit for tax paid to another city; school district tax follows where you live. The rates are low individually, but together they are often comparable to the state tax itself.
Neither is included in the figure on this page. Anyone comparing this against a real Ohio payslip should expect those lines to be missing.
What the employer pays on top
The employer matches Social Security and Medicare and pays federal unemployment tax at its net rate. Ohio unemployment insurance is an employer contribution at an experience-rated percentage on a state wage base. There is no employee-side state levy: no disability insurance, no paid leave premium.
What this calculator assumes
The figure models a salaried employee paid evenly across the year with a standard Form W-4 and state exemption certificate, and no pre-tax deductions. It leaves out:
- Municipal income tax and school district income tax.
- Pre-tax contributions such as a 401(k), health premiums, HSA or flexible spending accounts.
- Extra withholding requested on either certificate, and the W-4 Step 2 and Step 4 adjustments.
- Bonuses and other supplemental wages, which may be withheld differently.
- Employer-side Ohio unemployment insurance.
Withholding versus your final tax bill
Withholding is a prepayment. The federal and Ohio returns replace these assumptions with your real situation: itemised deductions, other income, and credits payroll knows nothing about, including Ohio's own joint filing credit and its exemption credit. Because the state formula ignores filing status entirely, a married couple filing jointly is the group most likely to find the return differs noticeably from what was withheld.