Haw. Rev. Stat. § 236E-17
(a) A Hawaii generation-skipping transfer tax is imposed on every taxable transfer involving:
(c) The person required to report and pay the federal generation-skipping transfer tax, or, if no federal generation-skipping transfer tax is due, the person who would be required to report and pay the federal generation-skipping transfer tax if any were due, shall file with the department the following:
(2) A true copy of the federal generation-skipping transfer tax return, if any is due.
The information required under this subsection shall be filed with the department on or before the date prescribed in section 2662 of the Internal Revenue Code and the regulations promulgated thereunder.
(d) If a federal transfer tax is due and the person required to file the return has obtained an extension of time for filing the federal return, the filing required by subsection (c) shall be extended similarly until the end of the time period granted in the extension of time for the federal return. A true copy of the extension shall be filed with the department along with the report required under subsection (c).
If a federal transfer tax is not due, the director of taxation may grant a reasonable extension of time for filing returns under rules as the department shall prescribe.
(e) If a taxable transfer subject to the Hawaii generation-skipping transfer tax is subject to a generation-skipping transfer tax imposed by another state and if the tax imposed by the other state is not qualified by a reciprocal provision allowing the property to be taxed in this State, the amount of the tax due under this section shall be credited with the lesser of:
[L 2012, c 220, pt of §1; am L 2018, c 27, §12]
The 2018 amendment applies to decedents dying or taxable transfers occurring after December 31, 2017. L 2018, c 27, §15(2).