How Hawaii income tax works: federal AGI, Hawaii’s own deductions, twelve brackets to 11%

Hawaii builds its income tax from federal adjusted gross income, then does everything after that line its own way. Form N-11 copies AGI from the federal return, adds a few items, subtracts pensions and Social Security, and then applies Hawaii’s own standard deduction, which for 2026 is $8,000 for a single filer, $16,000 on a joint return and $12,000 for a head of household, nearly double what it was in 2025. Each person on the return is worth a $1,144 exemption, doubled at 65. What is left runs through twelve brackets from 1.4% to 11%. Then come the credits, and in Hawaii the ones that matter most to ordinary households are refundable: the food/excise credit, the child and dependent care credit and an earned income credit worth 40% of the federal one. There is no local income tax anywhere in the state.

One thing follows from that design: a federal deduction taken below the AGI line, the standard deduction, the $6,000 senior deduction, the tips and overtime deductions, never reaches Hawaii automatically; Hawaii decides item by item, and for 2026 it kept some and refused others. Also, Hawaii indexes nothing for inflation; every figure on the return is one the Legislature wrote, which is why the 2026 standard deduction jumped all at once instead of creeping.

Who files

A full-year Hawaii resident files Form N-11 and reports all income, wherever earned, with a credit for tax paid to another state on income taxed by both. A part-year resident or a nonresident with Hawaii-source income files Form N-15 instead, which taxes everything earned while a resident plus Hawaii-source income for the rest of the year and prorates the standard deduction and exemptions. Residency is covered in Moving to Hawaii. A single person under 65 must file once gross income passes $5,544 ($6,688 at 65 or older) (verify 2026); below that it is still worth filing to collect the refundable credits.

Where it starts: federal AGI, line 7

Line 7 of the N-11 is federal adjusted gross income, straight from the 1040. Every above-the-line adjustment, an IRA contribution, an HSA deposit, self-employed health insurance, student loan interest, is already out when Hawaii starts and cuts Hawaii tax too. Everything the federal return does after AGI is invisible until Hawaii chooses to see it.

For 2026 Hawaii has made those choices in Act 35 of 2026, the annual conformity law, which adopted the Internal Revenue Code as it stood on December 31, 2025. That brings the July 2025 federal law into the Hawaii return for the first time. The Legislature then listed what it would not follow. The overtime deduction is out: overtime premiums are fully taxed by Hawaii. The car-loan interest deduction is out. The $6,000 senior deduction never applied, because it hangs on a section of federal law Hawaii has not used for decades; Hawaii’s version of an age break is the second $1,144 exemption described below. The tips deduction is in: the Department of Taxation’s Announcement 2026-06 lists IRC section 224, the deduction of up to $25,000 for qualified tips, among the new federal provisions Hawaii conforms to, along with the charitable deduction for non-itemizers and the Trump-account exclusions. Which N-11 line carries it is the one thing the 2026 instructions have yet to show (verify the line). The whole list is in What is new in Hawaii for 2026.

The additions, lines 8 to 11

Hawaii adds a short list of items to federal AGI. Most households have none of them.

State wages above federal wages, line 8. A state or county employee’s ERS contributions and a federal employee’s Hawaii cost-of-living allowance are in Box 16 of the W-2 but not Box 1; the difference goes here.

Out-of-state bond interest, line 9. Interest on municipal bonds issued by other states is tax-exempt federally and taxable in Hawaii. Interest on Hawaii and U.S. government bonds stays exempt.

Other additions, line 10. Depreciation differences (Hawaii does not allow bonus depreciation; a sole proprietor or landlord adds it back and takes Hawaii depreciation instead), a 529 withdrawal spent on K-12 tuition, and the pass-through entity tax credit add-back.

The subtractions, lines 13 to 19

This is where the Hawaii return gives the most back, and the first two lines are the ones that make Hawaii different.

Line 13 is for the employer-funded share of a pension. The part of any distribution that came from the employee’s own money, which includes all of a 401(k) built from salary deferrals and all of an IRA, stays in Hawaii income. The rule is explained in Hawaii for retirees.

What is left on line 20 is Hawaii adjusted gross income. Several credits key off this number rather than federal AGI, which is why a retired couple with a large pension can have a high federal AGI and a low Hawaii one.

Standard deduction or itemized, lines 21 to 24

Hawaii has its own standard deduction, and 2026 is the year it moves. Act 46 of 2024 set a schedule: $4,400 single or separate, $8,800 joint and $6,424 head of household for 2025; $8,000, $16,000 and $12,000 for 2026 and 2027; $9,000, $18,000 and $13,500 for 2028 and 2029; $10,000, $20,000 and $15,000 for 2030; $12,000, $24,000 and $18,000 from 2031. The Department of Taxation confirmed the 2026 figures in Announcement 2024-03. There is no extra standard deduction for age or blindness; the age break is in the exemptions.

Or you can itemize for Hawaii, and the Hawaii choice is independent of the federal one. A homeowner who took the $32,200 federal standard deduction can still itemize on the N-11 if mortgage interest, property tax, gifts and medical costs over 7.5% of Hawaii AGI exceed $16,000. Hawaii’s worksheets A-1 through A-6 follow the federal Schedule A categories with two Hawaii limits. The federal $40,400 SALT cap does not apply; instead, state and local income taxes are deductible only if federal AGI is under $100,000 single or separate, $150,000 head of household or $200,000 joint, and above those lines that deduction is gone entirely (property taxes remain deductible). Hawaii also still applies the pre-2018 federal overall limitation on itemized deductions for higher earners, at the 2009 thresholds.

Exemptions, line 25

Each exemption on line 6e is worth $1,144: taxpayer, spouse, each dependent. A taxpayer or spouse 65 or older gets a second one, so a retired couple both over 65 claims four, or $4,576. A dependent claimed on someone else’s return gets no exemption of their own. A person certified blind, deaf or totally disabled on Form N-172 may claim a $7,000 exemption in place of all others.

Hawaii AGI minus the standard or itemized deduction, minus exemptions, is Hawaii taxable income on line 26.

The rates, line 27

Hawaii has twelve brackets, and they did not move for 2026; Announcement 2024-03 says the 2026 brackets are the same as 2025.

Married filing separately uses the single column. The rates are marginal: a single filer with $50,000 of taxable income pays 1.4% on the first $9,600, 3.2% on the next $4,800, and so on, for a total of $2,691, about 5.4% of taxable income. Most working households finish in the wide 7.6% bracket.

Net long-term capital gains get an alternative maximum rate of 7.25%, figured on the Capital Gains Tax Worksheet. Because it is a maximum, it helps only once taxable income is past the 7.2% bracket, $36,000 single or $72,000 joint. Qualified dividends and short-term gains get no break and are taxed as ordinary income.

For 2027, Act 24 of 2026 widens the lower brackets, cuts the second and third rates to 2.5% and 5%, holds the 11% line and adds a 13% bracket over $500,000 single, $750,000 head of household and $1,000,000 joint. It does not touch the 2026 return.

The credits, lines 28 to 35

Hawaii puts its refundable credits first, on lines 28 through 33; if they exceed the tax, the difference is paid out. Most are figured on Schedule X.

There is no Hawaii child tax credit, no property tax credit on the income tax return, no K-12 or college tuition credit and no deduction for 529 contributions. The family credits, with a worked example, are in Credits and breaks for Hawaii families.

Withholding and estimated payments

Hawaii withholding on wages is figured from Form HW-4, the Hawaii version of the W-4, and the employer’s Booklet A tables. The Department re-issued the tables for 2026 to reflect the larger standard deduction, so withholding on an unchanged salary dropped in January. Nothing is withheld from pensions or IRA withdrawals; a voluntary 1099-R withholding election arrives in 2027 under Act 118 of 2026.

Anyone who expects to owe $500 or more after withholding and credits must make estimated payments on Form N-200V, due April 20, June 20, September 20 and January 20. The safe harbor is easier than the federal one: no penalty if withholding and credits cover the smaller of 60% of this year’s tax or 100% of last year’s. The people caught are retirees drawing on IRAs, the self-employed, landlords and anyone with a large capital gain. The penalty is figured on Form N-210.

How to file

The return is due April 20, 2027, five days after the federal date. Hawaii grants an automatic six-month extension to October 20 with no form to file, but only if 100% of the properly estimated tax is paid by April 20; a federal Form 4868 does not substitute. Interest and penalties run from April 20 on anything unpaid. Hawaii Tax Online, the Department’s own system, files the N-11 and N-15 free, takes bank-debit payments without a fee and shows refund status; commercial software carries the Hawaii return as well. Dates, forms and links are in Hawaii calendar and forms.

The general excise tax, which is not on this return

Hawaii has no sales tax. In its place is the general excise tax: 4% on the gross receipts of nearly every business, plus a 0.5% county surcharge in all four counties, passed on to customers at up to 4.712%. The difference from a sales tax is who owes it and on what: the business owes GET on everything it takes in, including services, rent and commissions, whether or not it collects from the customer. A landlord with one rental, a consultant with one client and a side business selling online all need a GET license (a one-time $20 fee) and periodic GET returns, profitable or not. Lines 51 to 53 of the N-11 ask anyone with a Schedule C, E or F for Hawaii gross receipts and a Hawaii tax ID, and the Department matches the two.

What trips people up

• An IRA or 401(k) distribution left off Hawaii income because “Hawaii doesn’t tax pensions.” It taxes the employee-funded part in full.
• The federal overtime deduction or the $6,000 senior deduction expected to lower Hawaii tax. Neither reaches the N-11.
• The state income tax deduction claimed on a Hawaii Schedule A with federal AGI over the $100,000, $150,000 or $200,000 line.
• Estimated payments sent on the 15th. Hawaii’s dates are the 20th, and the $500 threshold is low.
• A federal 4868 treated as a Hawaii extension.
• A rental or side business with no GET license.