Section 235-17(c), HRS, requires all claims for the credit, including amended claims, be filed on or before the end of the twelfth month following the close of the taxable year for which the credit may be claimed. Failure to comply with the twelve-month filing requirement constitutes waiver of the right to claim the credit. The department has no authority to suspend or waive this provision.
Haw. Code R. § 18-235-17-06