Conn. Gen. Stat. § 12-412h: Exemption for gas, electricity and fuel for heating when sold for use in agricultural production, fabrication of a product or manufacturing. Burden of proving that sale is for an exempt purpose.

For purposes of the exemptions from sales and use tax under subdivisions (3) and (16) of section 12-412, applicable to sales for use directly in agricultural production, fabrication of a finished product to be sold or furnishing of power to an industrial manufacturing plant, the burden of proving that a sale under said subsections is not subject to tax is upon the person making such sale unless such person takes a certificate from the purchaser, in good faith, to the effect that such sale is for an exempt purpose under the applicable subsection. Such certificate shall be signed by and bear the name and address of the manufacturer or producer and shall be on a form furnished by the commissioner for such purpose.