Tax liability
(j) Tax liability(1) In general. Tax liability for purposes of the regular and ESOP credit and carrybacks of nonrefundable energy credit to a taxable year ending before October 1, 1978, means the liability for tax as defined in section 46(a)(4). For ordering of regular, ESOP, and nonrefundable energy credits, see paragraph (m) of this section. In addition to taxes excluded under section 46(a)(4), tax liability does not include tax resulting from recapture of credit under section 47 and the alternative minimum tax imposed by section 55. See sections 47(c) and 55(c)(1). (2) Certain nonrefundable energy credit. For a taxable year ending after September 30, 1978, tax liability for purposes of the nonrefundable energy credit is liability for tax, as defined in section 46(a)(4) and paragraph (j)(1) of this section, reduced by the regular and ESOP credit allowed for the taxable year. Thus, carrybacks of regular or ESOP credit to a taxable year may displace nonrefundable energy carryovers or credit earned taken into account in that year. However, carrybacks of regular, ESOP, or nonrefundable energy credit do not affect refundable energy credit which is treated as an overpayment of tax under section 6401(b). See paragraph (k) of this section.