Ohio Rev. Code § 3123.021
If an obligor under a support order is identified as being in default under the order and is also identified under section 3121.895 of the Revised Code as obtaining employment, the withholding notice issued under section 3121.03 of the Revised Code shall require the arrearage amount resulting from the default to be withheld in addition to current support amounts.
If an obligor under a support order is identified as being in default under the order and is also identified through a source other than section 3121.895 of the Revised Code as obtaining employment, the child support enforcement agency administering the order shall send a withholding notice to the employer pursuant to section 3121.03 of the Revised Code, unless the employee's income is not subject to withholding, not later than two business days after discovery of the employment. The withholding notice shall require the arrearage amount resulting from the default to be withheld in addition to current support amounts.
Section 3123.21 of the Revised Code applies to a withholding notice issued in accordance with this section beginning on the date it is issued and ending on the date the period of default ends.
R.C. § 3123.021