Massachusetts General Laws Part I. Administration of the Government (Ch. 1-182) Ch. 63, § 38I

In determining the net income subject to tax under this chapter for the taxable year, a business corporation may deduct in addition to any other allowable deduction under this chapter, a deduction equal to the credit allowed under section fifty-one of the Federal Internal Revenue Code 1 as amended and in effect for the taxable year, with respect to wages deemed to be compensation paid in the commonwealth within the meaning of subsection (e) of section thirty-eight of this chapter; provided, however, that with regard to compensation qualifying for this deduction and the deduction under section thirty-eight F of this chapter, the corporation may elect either of two deductions but not both. Any such election must be made annually on the return filed and shall be irrevocable.