HARPTA when you PCS out: the 7.25% withholding, Form N-289, and the 10-day clock

The direct answer

Under HARPTA — the Hawaii Real Property Tax Act, section 235-68, Hawaii Revised Statutes — every buyer of Hawaii real property must withhold 7.25% of the amount realized and pay it to the Hawaii Department of Taxation, unless the seller gives the buyer a Form N-289 certifying an exemption. It is not a tax. The Department is explicit: the amount withheld is an estimated tax payment made for the seller, credited against what you actually owe when you file a Hawaii income tax return for the year of the sale. Over-withhold and you get it back — eventually. The whole game for an outbound military seller is reducing the withholding before closing rather than waiting a year to reclaim it. (Hawaii DOTAX Tax Facts 2010-1, rev. April 2025.)

What 7.25% actually means at Oahu prices

The withholding is 7.25% of the amount realized, which is not the same thing as your equity and not always the sticker price. Generally it's the sales price, but the Department includes the fair market value of any property you receive and any liability the buyer assumes. Critically, it's calculated on the whole amount realized — so a seller with modest equity, or none, can still see a large sum withheld from proceeds:

Note what the last line does to the most-cited exemption. The principal-residence exemption on Form N-289 applies where the amount realized does not exceed $300,000 — a ceiling that sits below both Oahu medians. On this island that exemption is largely theoretical for a typical sale, which is why Oahu sellers end up at Form N-288B instead.

Who this applies to — including the resident misperception

For a service member the residency question itself is genuinely fact-specific and worth getting right rather than assuming. The Department defines a resident person as an individual domiciled in Hawaii or one who resides in the State for other than a temporary or transitory purpose, and points to TIR 97-1, "Determination of Residence Status," for how that's decided. Keeping a mainland state of legal residence through a tour here doesn't automatically resolve it in either direction, and neither does length of time on island. This is the one question on this page worth taking to the Department or to a tax professional you choose before you list — the answer determines whether you're filing an N-289 or an N-288B.

The three N-289 exemptions

Withholding isn't required if the seller gives the buyer Form N-289 stating the seller's taxpayer identification number and one of the following:

1. The seller is a Hawaii resident person. See the residency note above.
2. No gain or loss is recognized under a nonrecognition provision of the Internal Revenue Code that Hawaii conforms to, or under a U.S. treaty. Common ones: a section 1031 like-kind exchange, transfers by gift, transfers by bequest, and transfers incident to divorce. You must describe the transfer and summarize the law and facts supporting the claim — and if any gain is recognized in a 1031 exchange, Form N-289 can't be used for it.
3. Principal residence under $300,000. The property was used by the seller as a principal residence for the year preceding the transfer and the amount realized does not exceed $300,000. As shown above, this rarely reaches an Oahu sale. Note this differs from federal FIRPTA, where the $300,000 test looks at the buyer's intended use.

The lever that usually matters here: Form N-288B and the 10-working-day clock

If you don't qualify for an N-289 exemption but you won't owe anywhere near 7.25% of the sale, the instrument is Form N-288B, the Application for Withholding Certificate, which asks the Department to reduce or eliminate the withholding up front. It's used where the seller will realize no gain, where the gain is fully covered by the capital-gains exclusion, or where sale proceeds are insufficient to pay the withholding in full.

One trap worth stating plainly: if you're relying on the principal-residence gain exclusion and any amount of gain remains after applying it, Form N-288B cannot be used, and the buyer is required to withhold the full 7.25% of the amount realized. Partial relief through N-288B is not available for a partially-excluded gain. And even when a withholding certificate is issued, you must still file a Hawaii income tax return for the year of the sale.

The capital-gains exclusion and the military suspension

Hawaii conforms to IRC section 121, which lets a seller exclude up to $250,000 of gain on a principal residence — $500,000 on a joint return — if the seller owned the home at least two years of the five-year period ending on the sale date, lived in it as a principal residence for at least two of those years, didn't acquire it through a 1031 exchange in the past five years, and hasn't excluded gain on another home in the two years before this sale.

The two-of-five-year test is exactly what a PCS breaks — which is why the military provision exists. Under the federal rules, a member of the uniformed services on qualified official extended duty may elect to suspend that five-year period for up to 10 years. Extended duty qualifies when you're serving at a duty station at least 50 miles from the home, under a call or order to active duty for an indefinite period or a definite period of more than 90 days (IRS Publication 523). A partial exclusion may also be available where the sale is due to a change in workplace location, health, or an unforeseeable event — the category most PCS-driven sales are argued under.

Two cautions. The suspension is a federal election described in IRS guidance; Hawaii's conformity to section 121 is stated by the Department in Tax Facts 2010-1, but how the election applies to your Hawaii return is a question to confirm with the Department or a tax professional rather than assume from this page. And the exclusion is about the tax — it only touches the withholding through a timely, approved Form N-288B.

Getting money back if too much was withheld

Two routes, per the Department. First, file your Hawaii income tax return after the end of the year; the withholding is credited against the tax and the excess is refunded. Second, if the return for the year of sale isn't available yet — the usual case for a summer PCS-season closing — you can apply for a tentative refund on Form N-288C. Either way you must still file a Hawaii return for the year of the sale to report the sale and any other Hawaii income. One detail worth knowing before you ask your escrow company to fix an error: escrow cannot apply for the refund. Once payment reaches the Department it's credited to the seller's account, and only the seller can request it back.

Next steps

1. Settle your residency status first. Domicile and the purpose of your presence under TIR 97-1 decide whether you're on the N-289 path or the N-288B path. Do this before you list, not during escrow.
2. Estimate the gain, not the equity. The Department is blunt that people confuse the two: you can have no equity and still have taxable gain, particularly after refinancing or depreciation on a rental period. Depreciation allowed or allowable reduces basis whether or not you claimed it.
3. Count 10 working days backward from your target closing. If Form N-288B is your route, that date — not closing — is your real deadline. Put it on the PCS calendar alongside the other clocks in the PCS timeline checklist.
4. Decide sell-vs-rent with the withholding in the math. A 7.25% hold on proceeds changes what a sale actually frees up this year. Run it against the accidental-landlord numbers in the sell-or-rent departure brief.
5. Take the return itself to a professional. Forms and current rates are on the Department's site; its technical section is reachable at 808-587-1577, and forms by phone at 808-587-4242 or toll-free 1-800-222-3229. For deeper background the Department points to TIR 2017-01.

Sources

• Hawaii Department of Taxation, Tax Facts 2010-1, "Understanding HARPTA" (rev. April 2025) — the 7.25% rate, amount realized, the resident misperception, the N-289 exemptions, the 20th-day payment deadline, N-288C refunds, and section 121 conformity.
• Hawaii DOTAX, Instructions for Form N-288B (rev. 2025) — the 10-working-day filing deadline and what happens to late applications.
• Hawaii DOTAX, TIR 97-1, "Determination of Residence Status" — how residency is determined.
• IRS Publication 523, "Selling Your Home" — the section 121 exclusion amounts and the uniformed-services suspension of the five-year test.

Compiled from the sources above and verified August 16, 2026. Rates, thresholds, and forms change; the Department's published forms and Tax Facts govern, not this page. Nothing here is tax, legal, or accounting advice, an opinion on your residency status, or a computation of what you will owe — those are for the Department of Taxation or a tax professional you choose.