Ohio Rev. Code § 3121.893
An employer shall make a new hire report for each newly hired employee or contractor in a manner prescribed by the department of job and family services. The department may require that the report include or consist of the submission of a copy of the United States internal revenue service form W-4 (employee's withholding allowance certificate) for the employee, a form provided by the department, or any other hiring document or data storage device or mechanism the department authorizes. An employer may make the new hire report by mail, fax, magnetic or electronic means, or other means the department authorizes. If an employer makes a new hire report by mail, the date of making the report is the postmark date if the report is mailed in the United States with first class postage and is addressed as the department authorizes. An employer shall make the new hire report not later than twenty days after the date on which the employer hires an employee or the date on which the employer engages or re-engages the contractor or the contractor resumes providing services under the contract.
R.C. § 3121.893