HRS §231-40.5
When the tax agency has extra time to check your return
If you leave out more than 25% of what you should have reported on your tax return, the state has 6 years from the filing date to assess or sue for the tax. If you clearly show the omitted amount on the return or an attached statement, it does not count as omitted. This follows federal tax rules.
The statute, as written — Statute of limitations; extension for substantial omissions
(a) Notwithstanding any other law to the contrary limiting the time for assessment of any tax, if a taxpayer omits an amount of: (1) Gross income or gross proceeds of sale; (2) Gross rental or gross rental proceeds; (3) Price, value, or consideration paid or received for any property; (4) Gross receipts; or (5) Gallonage, tonnage, cigarette count, day, or other weight or measure applicable to any tax, properly includable therein that is in excess of twenty-five per cent of the amount stated in the return, the tax may be assessed or a proceeding in court with respect to the tax without assessment may be begun without assessment, at any time within six years after the return was filed. (b) In determining any amount omitted, there shall not be taken into account any amount that is stated in the return if such amount is disclosed in the return or in a statement attached to the return in a manner adequate to apprise the department of taxation of the nature and amount of such item. (c) This section shall be construed in accordance with regulations and judicial interpretations given to section 6501 of the Internal Revenue Code.
LawTrove is not legal advice. The summary above is a computer-generated restatement — the authoritative text is the official version linked above.