Submit form IT 4 to your employer on or before the start date of employment so your employer will withhold and remit Ohio income tax from your compensation. With rare exception, employers that do business in Ohio are responsible for withholding Ohio individual income tax from their employees' pay.If you are eligible to claim an exemption from withholding, you can use the W-4 form. SmartAsset's Ohio paycheck calculator shows your hourly and salary income after federal, state and local taxes. Enter your info to see your take home pay. Contractor Exemption Listing. To claim exempt, write EXEMPT under line 4c. Years of age are exempt. • EXEMPT not written in the correct area – Must be under line 4c. • Step 1c does not have one of the boxes checked.