Section 2604. Credit for certain State taxes (a) General rule

-If a  generation-skipping  transfer  (other  than  a  direct  skip) occurs at the same time as and as a result of the death of
  an individual, a credit against the tax imposed by section 2601 shall be
  allowed in an amount  equal  to  the  generation-skipping  transfer  tax
  actually  paid  to  any State in respect to any property included in the
  generation-skipping transfer.
    (b) Limitation.-The aggregate amount allowed as a  credit  under  this
  section  with  respect to any transfer shall not exceed 5 percent of the
  amount of the tax imposed by section 2601 on such transfer.