(a) In order to provide the special reduced rate mandated by section one of this article and still maintain the integrity of the earnings of the eligible telecommunications carriers offering tel-assistance service, the commission shall determine, upon application by any affected eligible telecommunications carrier, that eligible telecommunications carrier's revenue deficiency for the eligible telecommunications carrier's taxable year resulting from the special reduced rates. Upon determining any eligible telecommunications carrier's revenue deficiency, the commission shall issue an order certifying the amount of that deficiency. Certified revenue deficiencies shall thereafter be recovered by the affected eligible telecommunications carrier as follows:

(1) An eligible telecommunications carrier's certified revenue deficiency, if any, resulting from the provision of tel-assistance service shall be allowed as a tax credit against the liability of the eligible telecommunications carrier pursuant to the provisions of article thirteen-g, chapter eleven of this code.

(2) After allowance of such a tax credit pursuant to the provisions of article thirteen-g, chapter eleven of this code, an eligible telecommunications carrier's remaining certified revenue deficiency, if any, resulting from the provision of tel-assistance service shall be allowed as a tax credit against the liability of the eligible telecommunications carrier pursuant to the provisions of section eleven-a, article twenty-four, chapter eleven of this code.

(b) An eligible telecommunications carrier's revenue deficiency under the provisions of section five of this article shall be limited to the amounts generated from providing tel-assistance service to qualified low-income consumers who are either disabled or age sixty or older. The agreements or tariffs required by this article shall specify the methodology by which the eligible telecommunications carrier will calculate the revenue deficiency, and may include a provision to freeze the revenue deficiency at certain levels as determined by the Public Service Commission. No such agreement or tariff by an eligible telecommunications carrier may be effective unless first approved by the Public Service Commission.

(c) In determining such revenue deficiency in the case of resale of tel-assistance service, the commission shall allocate the revenue deficiency between the eligible telecommunications carrier that physically provided the tel-assistance line, and the eligible telecommunications carrier that provided the tel-assistance service at retail to an eligible consumer. Such allocation shall be based on the wholesale resale discount applicable to such tel-assistance service.