Ohio Rev. Code § 4504.09
Any county, township, municipal, transportation improvement district, or regional transportation improvement project motor vehicle license tax shall be paid to the registrar of motor vehicles or to a deputy registrar at the time application for registration of a motor vehicle as provided in sections 4503.10 and 4503.102 of the Revised Code is made and no certificate of registration, numbered license plates and validation stickers, or validation stickers alone, shall be issued to the owner of a motor vehicle for which any amount of county, township, municipal, transportation improvement district, or regional transportation improvement project motor vehicle license tax due thereon has not been paid. Payment of the tax shall be evidenced by a stamp on the certificate of registration by the official issuing such certificate.
Upon the transfer of ownership of a motor vehicle, the registrar or deputy registrar shall collect any additional county, township, municipal, transportation improvement district, or regional transportation improvement project motor vehicle license tax due thereon, computed in the manner provided in section 4503.12 of the Revised Code.
R.C. § 4504.09