Hawaii Form N-15 is the state income tax return for nonresidents and part-year residents who earned income from Hawaii sources during the tax year. It uses a dual-column format: one column reports your total federal adjusted gross income, the other reports only the portion sourced to Hawaii. An allocation ratio built from those two numbers then determines how much of your deductions, exemptions, and calculated tax actually apply to the state. The return is due April 20, five days after the federal deadline.1Hawaii Department of Taxation. Frequently Asked Questions
Who Has to File Form N-15
Two groups file N-15: nonresidents with any Hawaii tax liability, and anyone who was a Hawaii resident for only part of the year. If you moved into or out of Hawaii during the tax year, you’re a part-year resident and belong on N-15, not on the resident Form N-11.2State of Hawaii Department of Taxation. Tax Facts 97-4 – Form N-15 Nonresident and Part-Year Resident Return Full-year Hawaii residents file N-11.
Hawaii sets no minimum income threshold and no minimum number of workdays before the filing obligation kicks in. A short business trip that produced Hawaii-sourced wages, or a single rental check from a Maui condo, is enough. If you assumed a small amount would fall below some exemption, it doesn’t.
Are You Actually a Nonresident?
Residency status controls the whole return, so it’s worth confirming before you file. Hawaii looks primarily at domicile: your true, permanent home, the place you intend to return to whenever you’re away.3Hawaii Department of Taxation. Tax Information Release 97-1 – Determination of Residence Status If your domicile stayed outside Hawaii for the full year, you’re a nonresident.
Domicile turns on real-world ties: voter registration, driver’s license, bank accounts, vehicle registration. DoTax weighs the total picture, and the burden is on you to show your permanent home is somewhere else if you claim nonresident status. Getting this wrong costs you: back taxes, penalties, and interest calculated as if you’d been a resident owing tax on worldwide income.
The 200-Day Presumption
Spend more than 200 days in Hawaii during the tax year, and DoTax presumes you were a resident from the day you arrived. The days don’t have to be consecutive. You can rebut the presumption with evidence of a permanent home outside the state and a temporary or transitory purpose for your time in Hawaii.4Legal Information Institute. Hawaii Code R 18-235-1.07 – Establishing Residency by Residing in the State If you can’t, you’re treated as a resident and file N-11 on your worldwide income instead.
What Counts as Hawaii-Sourced Income
Hawaii only taxes nonresidents on income sourced within the state. Mainland wages, mainland rental income, and interest from a mainland bank stay out of the N-15 calculation entirely. The sourcing rules vary by income type, and this is where most filers slip.
Wages
Wages are sourced to where you physically performed the work. Hawaii applies a physical presence rule, not the “convenience of the employer” test some states use. Telecommuting from your mainland home for a Honolulu employer produces no Hawaii-sourced wages. Working in Hawaii on a business trip does, even if your employer is headquartered elsewhere.
Rentals and Real Property
Rental income is sourced to where the property sits. Every dollar of net income from a Hawaii rental is Hawaii-sourced, no matter where you live. Royalties and other income tied to tangible property in the state follow the same rule.
Capital Gains
Capital gains from selling Hawaii real property are allocable to Hawaii.5Hawaii Department of Taxation. Chapter 235 HRS – Income Tax Law – Section 235-26 Hawaii also imposes a 7.25% withholding on the sale price when a nonresident sells Hawaii real property, under the Hawaii Real Property Tax Act (HARPTA).6Hawaii Department of Taxation. Tax Facts 2010-1 – Understanding HARPTA You receive Form N-288A documenting what was withheld and claim credit for that amount on your N-15. If the withholding exceeds your actual tax on the gain, you get the difference back, but only if you file.
Gains from selling intangible property such as stocks, bonds, and mutual funds are sourced to your state of residence. A nonresident selling shares in a Hawaii-based company owes Hawaii nothing on that gain.
Business and Pass-Through Income
Services performed in Hawaii as a sole proprietor are sourced where the work was done. Income from selling tangible goods is sourced to where the sale took place. If you receive a Schedule K-1 from a partnership or S-corporation operating in Hawaii, your share of Hawaii-sourced income flows from that K-1 onto the N-15.
How the Allocation Ratio Works
The allocation ratio is the engine of the N-15. Divide your Hawaii-sourced adjusted gross income by your total federal AGI, and that fraction determines how much of your deductions, exemptions, and calculated tax get attributed to Hawaii. It appears on Line 37 of the current form.7Hawaii Department of Taxation. Form N-15 Nonresident and Part-Year Resident Income Tax Return
Hawaii law requires nonresidents to prorate the standard deduction and personal exemptions by that ratio. If your Hawaii income is 15% of your total income, you claim 15% of the standard deduction and 15% of each exemption. Deductions not tied to a specific income source, such as medical expenses, are prorated the same way.8Justia. Hawaii Code 235-5 – Allocation of Income of Persons Not Taxable Upon Entire Income Deductions directly connected to your Hawaii income, like depreciation on a Hawaii rental, are fully deductible without proration.
For tax year 2025, the Hawaii standard deduction is $4,400 for single filers, $8,800 for married filing jointly, and $6,424 for head of household.9Department of Taxation. Tax Year Information – 2025 The personal exemption is $1,144.10Justia. Hawaii Code 235-54 – Exemptions Both are prorated on the N-15, so nonresidents with a small Hawaii fraction end up with modest deductions.
The tax calculation itself works in two steps. First, you compute the tax on your total AGI using Hawaii’s progressive rate schedules. Then you multiply that full tax figure by the allocation ratio to arrive at what you owe Hawaii, on Line 44 of the current form.7Hawaii Department of Taxation. Form N-15 Nonresident and Part-Year Resident Income Tax Return This means you pay at the bracket your total income would produce, but only on the Hawaii-sourced share.
Documents to Attach
Attach a complete copy of your federal Form 1040 with all schedules. DoTax uses it to reconcile your total AGI against the federal column of the N-15. Missing federal returns are a common cause of processing delays.
Include every W-2 showing Hawaii state withholding and every 1099 reporting Hawaii-sourced income. If you sold Hawaii real property and had HARPTA withholding, attach Form N-288A to claim the credit.11Hawaii Department of Taxation. Form N-288 Instructions – Hawaii Real Property Withholding Complete Schedule CR if you’re claiming any tax credits. Most nonrefundable credits, including the child and dependent care credit, are prorated by the allocation ratio.
Filing Deadline and Extensions
Hawaii individual returns are due April 20 each year.1Hawaii Department of Taxation. Frequently Asked Questions For tax year 2025, that means April 20, 2026.9Department of Taxation. Tax Year Information – 2025 If the date falls on a weekend or holiday, the deadline moves to the next business day.
Hawaii grants an automatic six-month extension to October 20, but only if you meet three conditions: pay 100% of your properly estimated tax liability by the original April 20 deadline, file the return before the extension period ends, and include full payment of any remaining balance when you file. The extension is to file, not to pay. Miss any of those conditions and the extension is treated as invalid, with penalties and interest running from the original due date.12Hawaii Department of Taxation. Tax Facts 2021-1 – Penalties and Interest
How to Pay
Electronic filing through authorized tax software is the fastest option, and DoTax accepts electronic payments through its website and through credit card processors. Paper filers mail returns with payment to a different P.O. box than returns without payment; both addresses are in the N-15 instructions.13Hawaii Department of Taxation. Instructions for Form N-15 Checks are made payable to “Hawaii State Tax Collector.”
Installment Agreements
If you can’t pay in full, DoTax offers installment agreements. You can request one online through Hawaii Tax Online when your unpaid balance is more than $100 and you don’t already have a plan in place. A nonrefundable $50 processing fee applies, and interest and penalties continue to accrue on the unpaid balance until it’s cleared.14Department of Taxation. Payment Plans All required returns must be on file before you’re eligible. Missing a payment or picking up a new tax liability puts the plan in default.
Estimated Tax for Nonresidents
If you expect to owe $500 or more in Hawaii tax for the year on income that isn’t subject to withholding, you generally have to make quarterly estimated payments using Form N-200V. The first quarterly payment is due April 20, and the remaining three follow the federal estimated tax schedule. Skipping required estimated payments triggers an underpayment penalty on top of any tax due, even if your final return ends up showing a refund.2State of Hawaii Department of Taxation. Tax Facts 97-4 – Form N-15 Nonresident and Part-Year Resident Return
Penalties for Missing the Deadline
Hawaii’s late penalties are steep enough that an extension paired with a best-guess payment almost always beats missing April 20 entirely.
- Late filing: 5% of the unpaid tax for each month or partial month the return is late, capped at 25%.15Hawaii Department of Taxation. Chapter 231 HRS – Administration of Taxes – Section 231-39
- Late payment: 5% of the unpaid tax for each month or partial month the payment is late, also capped at 25%.15Hawaii Department of Taxation. Chapter 231 HRS – Administration of Taxes – Section 231-39
- Interest: two-thirds of 1% per month on unpaid taxes and penalties, starting the day after the payment due date.12Hawaii Department of Taxation. Tax Facts 2021-1 – Penalties and Interest
The two penalties run concurrently, so filing late and paying late can hit 50% of the unpaid tax within five months, plus interest. Both can be waived on a showing of reasonable cause and not neglect, but DoTax sets a high bar. Filing on time with a partial payment beats filing late with a full one.
Amending a Filed N-15
To correct an error on a return you’ve already filed, submit a corrected Form N-15 with the “Amended Return” box checked. Attach an explanation of what changed and any supporting documents. Common triggers include a corrected W-2 or K-1 arriving after you filed, income sourced incorrectly the first time, or a credit you missed.
If the IRS adjusts your federal return in a way that changes your Hawaii-sourced income or deductions, you’re required to report the change to DoTax. To claim a refund on an amended return, you generally have to file within three years of the original due date or within two years of paying the tax, whichever is later. Wait longer and the right to the refund is gone, even if the overpayment is obvious.