Withholding tax remittance.

Requires the department of state revenue (department) to provide written notice, by electronic means, to each employer that is registered in the department's online INTIME program and whose employer's Form WH-1 monthly withholding tax report or withholding tax remittance is past due. Requires each payroll service provider to annually register with the department beginning January 1, 2022. Specifies the contents of the annual registration form. Defines "payroll service provider" and "responsible person" for purposes of these provisions. Provides that the department may charge an annual payroll service provider registration fee for purposes of the registration program. Provides that a provider shall be permitted to retain any income generated on business client (client) funds while held in a provider's legal possession pending remittance to authorized payees if the client agreement expressly permits it and the provider complies with certain rules. Provides that a payroll service provider contract must include a provision that specifies that if the payroll service provider fails to deposit or remit a business client's employer withholding taxes when due, and the failure is caused by an error or omission of the payroll service provider and not by the business client, the payroll service provider shall be required to reimburse the business client for the business client's payment of any penalties or interest assessed by the department as a result of the failure. Provides that, if a provider knowingly or intentionally fails to remit taxes withheld, the provider is liable and responsible persons shall be personally liable for such taxes that were withheld and not remitted, along with penalties and interest. Provides that a responsible person of the provider who knowingly or intentionally fails to remit taxes that were withheld commits a Class A misdemeanor, and increases the penalty depending on the amount of taxes that were not remitted. Provides that the liability shall not be construed to relieve the liability of the employer or any person otherwise with a duty to withhold. Provides that the employer's address shall be the address of record with the department for withholding tax purposes and that a payroll service provider may not change the address of record with the department.