subsection (b)(2) applies, the applicable exclusion amount in effect at the time of the decedent’s death is less than such amount in effect at the time such gift is made by the decedent, the amount of tax computed under subsection (b) shall be reduced by the amount of tax which would have been payable under chapter 12 at the time of the gift if the applicable exclusion amount in effect at such time had been the applicable exclusion amount in effect at the time of the decedent's death and the modifications described in subsection (g) had been applicable at the time of such gifts. (2) Limitation The aggregate amount of gifts made in any calendar year to which the reduction under paragraph (1) applies shall not exceed the excess of— (A) the applicable exclusion amount in effect for such calendar year, over (B) the applicable exclusion amount in effect at the time of the decedent's death. (3) Applicable exclusion amount The term applicable exclusion amount means, with respect to any period, the amount determined under section 2010(c) for such period, except that in the case of any period for which such amount includes the deceased spousal unused exclusion amount (as defined in section 2010(c)(4)), such term shall mean the basic exclusion amount (as defined under section 2010(c)(3), as in effect for such period). . (B) Gift tax adjustment Section 2502 of such Code is amended by adding at the end the following new subsection: (d) Adjustment To reflect changes in exclusion amount (1) In general If the taxpayer made a taxable gift in an applicable preceding calendar period, the amount of tax computed under subsection (a) shall be reduced by the amount of tax which would have been payable under chapter 12 for such applicable preceding calendar period if the applicable exclusion amount in effect for such preceding calendar period had been the applicable exclusion amount in effect for the calendar year for which the tax is being computed and the modifications described in subsection (g) had been applicable for such