Hawaii Estate Tax: $5.49M Exemption + Non-Resident Rules

Hawaii is one of 12 states (plus DC) that impose a state-level estate tax. The Hawaii estate tax is codified at HRS Chapter 236E, administered by the Hawaii Department of Taxation, and filed on Hawaii Form M-6. For 2026, the exemption is $5.49 million per individual — and unlike most states, Hawaii recognizes portability between spouses, doubling the shelter to $10.98M for a married couple that files the portability election timely.

Two features make Hawaii's estate tax distinct from the other state estate-tax regimes:

• The top marginal rate of 20% — tied with Washington for the highest state estate tax rate in the country. Massachusetts, Oregon, and Vermont cap at 16%.
• The aggressive non-resident sourcing rules under HRS 236E-2, which reach Hawaii-situated real property of non-residents. A California or Washington resident with a Maui condo or Big Island rental is in scope.

The Hawaii exemption: $5.49M in 2026, indexed

HRS 236E-7 sets the Hawaii estate tax filing threshold and exemption equal to the pre-TCJA federal exemption (the $5M base, indexed for inflation). Hawaii deliberately did not adopt the post-TCJA $13.99M federal exemption when the TCJA passed. The progression of the Hawaii exemption since the statute was last amended:

• $5.34M (the earliest indexed figure under the current statute)
• $5.45M
• $5.49M (the current 2026 figure, confirmed by Hawaii Department of Taxation)

This is the per-individual amount. With portability, a married couple can shelter up to $10.98M — but only if Form M-6 is filed within 9 months of the first death electing portability of the deceased spouse's unused exclusion amount (DSUE).

The Hawaii rate structure: 10% to 20% on the excess

Hawaii applies graduated rates only to the taxable estate above the $5.49M exemption (no cliff effect at the threshold). The bracket structure under HRS 236E-8:

On an $8M Hawaii resident estate (taxable estate of $2.51M after the $5.49M exemption), the Hawaii tax bill runs approximately $311,200. On a $15M estate ($9.51M taxable), the bill jumps to approximately $1,331,600. On a $25M estate ($19.51M taxable), the bill exceeds $3.27M — the 20% top rate doing most of the work above $10M of taxable estate.

Worked example: $8M Hawaii estate, single individual

David, a Honolulu resident, age 76, dies leaving an $8M estate:

• Primary residence in Kahala: $2.5M (cost basis $400K from a purchase decades ago)
• Brokerage account at Schwab: $3.0M (cost basis $1.2M)
• Traditional IRA: $1.5M
• Big Island vacation rental: $850K (cost basis $300K)
• Bank accounts and personal property: $150K
• Total gross estate: $8,000,000

Hawaii estate tax calculation:

• Gross estate: $8,000,000
• Less Hawaii exemption: ($5,490,000)
• Hawaii taxable estate: $2,510,000

Applying the graduated rates: 10% on the first $1M ($100,000) + 11% on the next $1M ($110,000) + 12% on the next $510K ($61,200) = $271,200 in Hawaii estate tax.

Federal estate tax: $0. David's $8M gross estate is well below the federal $13.99M exemption. The Hawaii tax is the entire estate tax bill. There is no federal estate tax against which to deduct the Hawaii payment (under IRC §2053), so the Hawaii liability is borne in full.

Step-up in basis: David's heirs receive a full federal §1014 step-up to date-of-death FMV on all appreciated assets. The $1.8M of brokerage gain ($3.0M FMV less $1.2M basis), the $2.1M of home appreciation, and the $550K of vacation-rental gain all reset. Heirs selling those assets the following month pay near-zero capital gains.

Non-resident sourcing: the Hawaii vacation-property trap

HRS 236E-2 reaches non-residents who own Hawaii-situated real property or tangible personal property at death. This is the rule that catches most mainland families with vacation homes or rental properties in Hawaii.

The non-resident estate tax is computed in three steps:

1. Compute the hypothetical Hawaii estate tax as if the decedent had been a Hawaii resident with the same worldwide gross estate.
2. Multiply by the ratio of (Hawaii-situated property) divided by (worldwide gross estate).
3. That product is the non-resident Hawaii estate tax owed.

Worked example: California resident with Maui condo

Linda is a Palo Alto resident with a $15M worldwide estate. Her assets include a $2M Maui beachfront condo titled in her revocable trust. She dies as a California resident.

Step 1 — Hypothetical Hawaii tax on $15M: Gross estate $15M, less Hawaii exemption $5.49M = $9.51M taxable. Cumulative graduated tax: $1,370,000 (cumulative through $10M bracket) less adjustment for the unused portion of the top bracket. Approximately $1,331,600 hypothetical.

Step 2 — Hawaii-situated ratio: $2M Hawaii real property / $15M worldwide = 13.33%.

Step 3 — Non-resident Hawaii tax: $1,331,600 × 13.33% = approximately $177,500.

Linda's estate owes Hawaii roughly $177,500 in non-resident estate tax on the $2M Maui condo, even though she was a California resident with the bulk of her estate located outside Hawaii. This is in addition to any California or federal estate tax due (California has no state estate tax; federal is $0 because $15M is above but the exemption $13.99M leaves only $1.01M taxable at 40% = ~$404,000 federal).

Planning around the non-resident sourcing rule: the LLC restructuring move

The most reliable structural defense against Hawaii non-resident estate tax for vacation-property owners is conversion of real-property situs to intangible interest situs. The mechanics:

1. Form a Hawaii LLC (or a Delaware/Nevada LLC qualified to do business in Hawaii).
2. Transfer the Hawaii real property into the LLC at fair market value, claiming the spousal/related-party exemption from Hawaii conveyance tax (HRS 247-3) where available.
3. The decedent owns LLC membership interests, not Hawaii real property directly.
4. The LLC interests are then ideally held by an out-of-state irrevocable trust resident in a no-estate-tax state (Florida, Nevada, Texas, Wyoming).

At death, the asset included in the decedent's estate is an intangible LLC membership interest. Intangibles owned by non-residents are not subject to Hawaii estate tax under HRS 236E-2. The transformation neutralizes the non-resident exposure.

Caveats:

• The restructuring must be substantively prior to death (at least 2-3 years for IRS step-transaction risk, though Hawaii has not aggressively challenged shorter timelines).
• Hawaii General Excise Tax (GET) on rental income is unaffected. The LLC will still owe Hawaii income tax and GET on its Hawaii-source rental income.
• Loss of step-up basis on the LLC interests at death — the underlying Hawaii real property does still receive a §1014 step-up through the LLC, but the planning needs careful drafting to preserve.
• Aggressive use of single-member LLCs treated as disregarded entities for federal tax may not provide situs conversion, depending on Hawaii's look-through approach.

Portability: Hawaii's rare advantage

Hawaii is one of only two states (with Maryland) to recognize portability of the deceased spouse's unused exclusion (DSUE) under HRS 236E-9. This is a meaningful advantage for Hawaii couples with $6M-$11M combined estates. Without portability, each spouse's $5.49M exemption operates independently; with portability, the surviving spouse can claim the first spouse's unused amount.

The portability election:

• Must be made on a timely-filed Hawaii Form M-6 estate tax return at the first death.
• The Form M-6 deadline is 9 months after death, with a 6-month extension available.
• The election must be made even if no Hawaii tax is owed at the first death (e.g., because the marital deduction covers the entire estate).
• Once elected, the DSUE is available to the surviving spouse's estate at the second death — locked in even if Hawaii law changes later.

The most expensive single failure point for Hawaii couples: not filing Form M-6 at the first death because no tax was owed. By the time the surviving spouse dies, the deadline has passed and the DSUE is forfeit. On an $11M Hawaii couple, the cost of this filing error can exceed $1M in lost shelter.

Comparison with credit shelter trust: when does each tool win?

For couples in states with no portability (Massachusetts, Oregon, Vermont, DC, etc.), the credit shelter trust is the only way to preserve the first spouse's exemption. Hawaii couples have two tools available: portability OR a credit shelter trust. Which is better?

For most Hawaii couples in the $6M-$11M band who do not have blended-family or creditor concerns, portability is the simpler and more tax-efficient choice. For larger estates with rapid expected appreciation, blended families, or asset-protection needs, a credit shelter trust still wins despite the loss of second-death step-up.

Federal-Hawaii interaction: deduction at large estate sizes

For estates large enough to owe federal estate tax (over the $13.99M federal exemption in 2026), Hawaii estate tax paid is deductible on the federal Form 706 under IRC §2053(a)(3) as a debt of the estate. The deduction reduces the federal taxable estate, saving 40% of the deducted Hawaii tax in federal tax.

On a $25M Hawaii resident estate paying $3.27M in Hawaii tax: the federal return deducts $3.27M before computing the 40% federal rate, saving roughly $1.31M in federal tax. Net Hawaii cost after federal deduction: $3.27M - $1.31M = approximately $1.96M.

For estates between $5.49M and $13.99M, no federal tax is owed, so the Hawaii tax is unrecovered. This is the most common Hawaii exposure zone: $6M-$14M estates owing 10-15% Hawaii tax on the excess over $5.49M with no federal offset available.

Lifetime gifting: Hawaii has no gift tax

Hawaii does not impose a state-level gift tax. Lifetime gifts of any size are not taxed by Hawaii (though federal gift tax under IRC §2501 still applies for gifts over the $19,000 annual exclusion). This creates the same asymmetry as in DC, Massachusetts, and most other states with estate-but-not-gift taxes: a Hawaii resident can give away up to $13.99M lifetime (federal exemption) without state-level gift tax consequence.

High-impact Hawaii lifetime gifting strategies for $8M+ couples:

• Annual exclusion gifts: $19,000 per donee per donor for 2026. A married couple with 4 children and 6 grandchildren can give $380,000/year tax-free. Over 10 years, that's $3.8M removed from the Hawaii estate at zero tax cost.
• Spousal Lifetime Access Trust (SLAT): one spouse gifts up to $5.49M (using federal exemption) to an irrevocable trust for the other spouse. Removes the gifted assets and all future appreciation from both spouses' Hawaii estates.
• Direct payment of medical and tuition under IRC §2503(e): unlimited amounts paid directly to providers. Hawaii grandparents paying private school tuition for grandchildren on the mainland can remove $100K-$200K/year from the taxable estate.
• Grantor Retained Annuity Trust (GRAT) for pre-IPO founders: for Hawaii tech/biotech founders with pre-IPO stock, a short-term zero-out GRAT can shift appreciation out of the estate with minimal taxable gift.

Relocation: when does moving from Hawaii save estate tax?

For Hawaii residents with $10M+ estates, the relocation calculus is meaningful. The most common alternative destinations:

California, Nevada, Florida, and Texas have no state estate tax. The relocation saves the entire Hawaii bill. Washington is even worse than Hawaii at large estate sizes because of its lower $2.193M threshold and 20% top rate.

That said, don't move from Hawaii solely for estate tax. The cost of leaving a community where you've built relationships and where family lives is rarely offset by the tax savings on estates under $10M. For $15M+ estates with limited multigenerational Hawaii roots, the math becomes more compelling. The Hawaii Department of Taxation does verify residency aggressively in high-asset estate cases, so the relocation needs to be substantively complete (driver's license, primary residence, voter registration, doctors, dentists, mail forwarding) well before death.

Filing: Form M-6, due 9 months after death

Hawaii estate tax returns are filed on Form M-6 with the Hawaii Department of Taxation, due 9 months after the date of death. A 6-month extension is available on Form M-4768, but the extension applies only to the filing deadline, not to payment. Estimated tax must be paid by the original 9-month deadline.

Hawaii requires a Form M-6 filing for any estate where the gross estate exceeds the $5.49M filing threshold OR where the executor wishes to elect portability (regardless of whether tax is owed). The portability election is the most commonly missed filing requirement — surviving spouses often skip filing because no Hawaii tax was owed at the first death, then face an unexpected bill at the second death because the DSUE was forfeit.

Common Hawaii estate tax mistakes

• Assuming federal exemption applies: Hawaii follows the pre-TCJA $5M base (indexed to $5.49M), not the current federal $13.99M figure. Many out-of-state attorneys and accountants miss this entirely.
• Missing the portability election deadline: failing to file Form M-6 within 9 months of the first death permanently forfeits portability. The fix is filing even when no tax is owed.
• Holding Hawaii vacation property directly as a non-resident: the LLC restructuring is the well-known fix, but the majority of non-resident Hawaii property owners have not implemented it.
• Ignoring the 20% top rate: Hawaii's 20% rate above $10M of taxable estate is the highest in the country (tied with Washington). For $25M+ estates, the back-end rate dominates the planning math.
• Forgetting Hawaii General Excise Tax (GET) on rental income: LLCs holding Hawaii rental property still owe Hawaii income tax and GET on rental income. The estate-tax restructuring does not change the lifetime income-tax exposure.
• Treating Hawaii as if it were a no-tax state because Maui felt easy: a perennial mainland mistake. The estate-tax bill on a Wailea house alone can run $150K-$300K under the non-resident sourcing rule.

Decision framework: who needs active Hawaii estate planning?

1. Single Hawaii resident under $5M, or couple under $10M with portability: simple will + beneficiary designations likely sufficient. No active Hawaii planning needed.
2. Single $5M-$10M / couple $10M-$15M: file Form M-6 portability election at first death (couple). Annual exclusion gifting program reduces exposure for larger estates in this band.
3. Single $10M-$20M / couple $15M-$25M: SLAT or credit shelter trust analysis. Aggressive annual gifting. Non-resident vacation-property owners need LLC restructuring.
4. $20M+ Hawaii estates: full planning suite — SLAT, GRAT, ILIT, dynasty trusts, charitable lead trusts. Relocation analysis worth running.
5. Non-residents with Hawaii vacation property: LLC restructuring is the priority regardless of mainland estate size. The $3K-$8K setup cost prevents $50K-$300K+ in non-resident Hawaii estate tax.

Key takeaways

• Hawaii's 2026 estate tax exemption is $5.49M per individual, indexed annually under HRS Chapter 236E. Rates run 10% to 20% on the excess — the 20% top rate tied with Washington for highest in the country.
• Hawaii recognizes portability between spouses under HRS 236E-9 — one of only two states (with Maryland) to do so. A married couple can shelter $10.98M with timely Form M-6 election.
• Non-residents owning Hawaii-situated real property are subject to Hawaii estate tax on a proportional basis. A $2M Hawaii vacation home in a $15M California estate triggers approximately $177,500 in Hawaii non-resident estate tax.
• The LLC restructuring move (Hawaii real property → LLC → out-of-state irrevocable trust) converts the asset to an intangible interest, avoiding the non-resident sourcing rule. Setup cost $3K-$8K; savings can exceed $300K on a $3M property.
• On an $8M Hawaii resident estate, the state tax bill is approximately $311,200. On a $25M estate, the bill exceeds $3.27M — reduced to roughly $1.96M after federal estate tax deduction under IRC §2053.
• Hawaii has no state-level gift tax. Annual exclusion gifting and SLAT structures are the most underused tools for $10M+ Hawaii families.
• For $15M+ Hawaii estates with limited multigenerational roots, relocation to California, Nevada, Florida, or Texas saves the entire Hawaii bill — though the move should be made for non-tax reasons first and substantively complete well before death.