N.Y. Comp. Codes R. & Regs. tit. 20, § 171.8
(a) An employer need not deduct and withhold any New York State personal income tax from a payment of wages made to an employee, provided:
(2) such exemption certificate is in effect.
The exemption from withholding certificate is not in effect if it has expired, has been revoked by the employee or has been required to be revoked by the employer. If the employee files his New York State personal income tax return on a calendar-year basis, the exemption from withholding certificate expires on the 30th day of April of the next year. If the employee files his New York State personal income tax return on a fiscal-year basis, the exemption from withholding certificate expires on the last day of the fourth month following the close of the taxable year.
(b)
(1) An employee qualifies for exemption from withholding of New York State personal income tax under paragraph (3) of subsection (a) of section 671 of the Tax Law with respect to a taxable year if: An employee incurs New York State income tax liability if his joint or separate New York State personal income tax return shows any New York State income tax before the allowance of any credit for New York State personal income tax withheld. A full-time student is one who meets the requirements of subsection (b) of section 1.151-3 of the Federal income tax regulations.
(2) An employee who qualifies for exemption from withholding of New York State personal income tax on the grounds set forth in this subdivision must revoke the exemption from withholding certificate:
(i) within 10 days from the day such employee can reasonably expect to incur New York income tax liability for the current taxable year; or
(ii)
(3) An employer must revoke the exemption from withholding certificate within 10 days from the date that the date of birth stated on the exemption from withholding certificate furnished by the employee indicates that the employee no longer meets the age requirements for exemption from withholding under this subdivision. The revocation must be made by written notice to the employee.
(c) Submission of certain Certificates of Exemption from Withholding (forms IT-2104E).
(2) Rules for submission.
(i) In general.
(b) When to submit. Copies of Certificates of Exemption from Withholding (forms IT-2104E) required to be submitted under paragraph (1) of this subdivision are to be submitted as follows:
| Reporting period | Due date |
|---|---|
| January through March | April 30th |
| April through June | July 31st |
| July through September | October 31st |
| October through December | January 31st |
(4) Computation of New York State personal income tax to be withheld.
(d) The provisions of this section shall also be applicable in determining exemption from withholding for purposes of the City of New York personal income tax on residents of the City of New York and the City of Yonkers income tax surcharge on residents of the City of Yonkers.
(e) Penalties.
Tax Law, § 671(a)(3)