Ohio Employer Payroll Setup & Compliance — IT 941, JFS-20125, Municipal Withholding

Establish all required Ohio employer accounts before the first paycheck runs. Register with the Ohio Department of Taxation for state income tax withholding, with ODJFS for SUI via the ERIC portal, and with the Ohio BWC for workers' compensation. Critically, map every work location and every employee's home address to their taxing municipality — this determines whether RITA, CCA, or a direct-file city (Columbus, Cincinnati, Dayton, Toledo) is the correct collection agency for each obligation.

Collect Form IT 4 (Ohio's W-4 equivalent) from every new hire on or before their first day. IT 4 captures personal and dependent exemptions, the employee's school district number (line 4 — triggers school district income tax withholding if applicable), and the resident municipality (line 5 — used to determine courtesy withholding obligations). If IT 4 is not submitted, withhold at zero exemptions / single status as required by R.C. 5747.06(A). Configure the payroll system with the correct 2025 Ohio brackets (0% on the first $26,050, 2.75% on $26,051–$100,000, 3.50% above $100,000) and verify the payroll provider is using the updated 3.5% supplemental wage flat rate.

For each pay period, compute and remit Ohio state withholding (IT 501 for monthly/partial-weekly depositors) and municipal withholding to the correct agencies. The most error-prone step is municipal allocation: withhold at the workplace municipality rate for each day worked there, and apply the 20-day rule — the employer is not required to withhold for a non-principal-place-of-work municipality until the 21st day in that municipality in the calendar year, but once exceeded, withholding is retroactive to day one. Track actual days per municipality per employee. Determine whether to perform courtesy withholding to the employee's resident municipality and calculate any credit offset.

Each quarter, report wages and pay SUI contributions to ODJFS via Form JFS-20125 (Quarterly Contribution and Wage Report) filed through the ERIC portal. The 2025 SUI taxable wage base is $9,000 per employee. New non-construction employers pay 2.70%; construction employers pay 5.60%. The mutualized add-on rate is 0.0% for 2025. Verify each employee's cumulative wages to date to avoid over- or under-remitting once the $9,000 wage base is exhausted. Quarterly deadlines are April 30, July 31, October 31, and January 31.

By January 31 of the following year, file the annual IT 941 reconciliation with ODT and submit Form IT 3 (W-2 transmittal) with copies of all W-2s. Simultaneously file annual municipal withholding reconciliations: RITA Form 27 (due February 28), CCA Form CCA-W3, and each direct-file city's reconciliation form (Columbus IT-11, Cincinnati W-3, Dayton D-W3, Toledo W-3). Verify that year-end W-2 Box 15–20 state and local wage entries match every agency's records. Failure to transmit W-2s carries a $50 per-W-2 penalty up to $25,000.