Liability for tax.
Liability for tax. For the purpose of computing the limitation based on amount of tax, section 50A(a)(3) defines the liability for tax as the income tax imposed for the taxable year by chapter 1 of the Code, reduced by the sum of the credits allowable under -
(1) Section 33 (relating to taxes of foreign countries and possessions of the United States,
(2) Section 37 (relating to credit for the elderly),
(3) Section 38 (relating to investment in certain depreciable property), and
(4) Section 41 (relating to contributions to candidates for public office).