Your employer may be taking out too little, by design
Hawaii's income tax climbs to 11% across twelve brackets, but the withholding tables employers use stop at 7.90% - they reproduce the first eight brackets and then flatten everything above. The consequence is arithmetic, not opinion: above roughly $125,000 single or $250,000 filing jointly, what comes out of your pay is structurally less than what you owe, and the difference lands at filing. This page reports the tax due, so it will read higher than your stub if you are in that range. That is the point of it.
Two calendars, and only one of them moved
2026 is a year where a careless summary gets Hawaii half right. Act 46 left the brackets unchanged from 2025 - the schedule in force is the one that took effect after 31 December 2024, and the next one does not start until 2027. But the standard deduction changed: $8,000 for a single filer, $16,000 filing jointly, $12,000 as head of household, close to double the 2025 amounts. Saying "2026 is the same as 2025" is true of the rates and false of the deduction.
The state form, and the one it will not accept
Hawaii does not take the federal W-4. Your employer needs Form HW-4, and there is no "exempt" status on it - state law does not allow one. Worth knowing if you fill it in: the worksheet on page 2 still prints the pre-2024 standard deductions, which are now well out of date, and the Department of Taxation has not reissued it. The only other state line on your stub is Temporary Disability Insurance, at 0.5% of weekly pay and capped at $7.50 a week; your employer is allowed to pay more of it than that and some do.
Hawaii is the one state where the withholding tables cannot keep up with the tax. The tables your employer uses stop at 7.90%, but Hawaii's income tax itself goes up to 11%. Above roughly $125,000 single or $250,000 joint, what comes out of your paycheck is structurally less than what you owe — not an error, just the limit of the published tables — and the gap lands on your return. High earners here often need to plan for it rather than be surprised by it.