Credit available.
Credit available. The credit available for the taxable year is the sum of
(1) Unused credit carried over from prior taxable years under section 46(b) (carryovers).
(2) Amount of credit determined under section 46(a)(2) for the taxable year (credit earned), and
(3) Unused credit carried back from succeeding taxable years under section 46(b) (carrybacks).