2 U.S.C. § 4594

(a) Agreement by Secretary with appropriate State official; covered individuals Whenever— (1) the law of any State provides for the collection of an income tax by imposing upon employers generally the duty of withholding sums from the compensation of employees and remitting such sums to the authorities of such State; and (2) such duty to withhold is imposed generally with respect to the compensation of employees who are residents of such State; then the Secretary of the Senate is authorized, in accordance with the provisions of this section, to enter into an agreement with the appropriate official of that State to provide for the withholding and remittance of sums for individuals— (A) whose pay is disbursed by the Secretary; and (B) who request the Secretary to make such withholdings for remittance to that State. (b) Number of remittances authorized Any agreement entered into under subsection (a) of this section shall not require the Secretary to remit such sums more often than once each calendar quarter. (c) Requests by individuals of Secretary for withholding and remittance; amount of withholding; number and effective date of requests; change of designated State; revocation of request; rules and regulations (1) An individual whose pay is disbursed by the Secretary may request the Secretary to withhold sums from his pay for remittance to the appropriate authorities of the State that he designates. Amounts of withholdings shall be made in accordance with those provisions of the law of that State which apply generally to withholding by employers. (2) An individual may have in effect at any time only one request for withholdings, and he may not have more than two such requests in effect with respect to different States during any one calendar year. The request for withholdings is effective on the first day of the first month commencing after the day on which the request is received in the Disbursing Office of the Senate, except that— (A) when the Secretary first enters into an agreement with a State, a request for withholdings shall be effective on such date as the Secretary may determine; and (B) when an individual first receives an appointment, the request shall be effective on the day of appointment, if the individual makes the request at the time of appointment. (3) An individual may change the State designated by him for the purposes of having withholdings made and request that the withholdings be remitted in accordance with such change, and he may also revoke his request for withholdings. Any change in the State designated or revocation is effective on the first day of the first month commencing after the day on which the request for change or the revocation is received in the Disbursing Office. (4) The Secretary is authorized to issue rules and regulations he considers appropriate in carrying out this subsection. (d) Time or times of agreements by Secretary The Secretary may enter into agreements under subsection (a) of this section at such time or times as he considers appropriate. (e) Provisions as not imposing duty, burden, requirement or penalty on United States, Senate, or any officer or employee of United States; effect of filing paper, form, or document with Secretary This section imposes no duty, burden, or requirement upon the United States, the Senate, or any officer or employee of the United States, except as specifically provided in this section. Nothing in this section shall be deemed to consent to the application of any provision of law which has the effect of subjecting the United States, the Senate, or any officer or employee of the United States to any penalty or liability by reason of the provisions of this section. Any paper, form, or document filed with the Secretary under this section is a paper of the Senate within the provisions of rule XXX of the Standing Rules of the Senate. (f) “State” defined For the purposes of this section, “State” means any of the States of the United States and the District of Columbia.