N.Y. Insurance Law § 2304
(b) The information furnished in support of a filing may include:
(d) The systems of expense provisions included in the rates for use by any insurer or group of insurers may differ from those of other insurers or groups of insurers to reflect the requirements of the operating methods of any such insurer or group with respect to one or more kinds of insurance, or subdivisions of kinds of insurance, or classes of risks, or any part or combination of the foregoing, for which separate expense provisions are applicable. (e)(1) Premiums for workers' compensation insurance for employments classified under sections two hundred twenty, two hundred forty and two hundred forty-one of the labor law, provided such employments are classified under each of said sections, shall be established on the basis of payroll and a formula which provides appropriate credits, provided such credits shall not apply to payroll in excess of the payroll limitation amount set forth in subdivision two of section eighty-nine of the workers' compensation law and this subsection. With the exception of employments engaged in the construction of one or two family residential housing, premiums shall be calculated in accordance with the following limitations:
(2) The loss costs applicable to employments classified under sections two hundred twenty, two hundred forty and two hundred forty-one of the labor law, provided such employments are classified under each of said sections, shall be adjusted to reflect the payroll limitations required by this section as they separately affect such rates for work actually performed within each of the following geographic territories: