Hawaii Estate
Tax Calculator

Hawaii imposes a state estate tax with an exemption of **$5.49 million**, indexed for inflation. The tax applies to estates of Hawaii residents and to Hawaii-situated property of nonresidents.

Rates range from 10% to 20%, with the top rate applying to taxable estates exceeding $10 million — one of the highest state estate tax rates in the nation.

Hawaii is also notable for being one of the few states to allow estate tax portability between spouses. A surviving spouse may elect to use the deceased spouse's unused Hawaii estate tax exemption, similar to the federal portability provisions.

This feature meaningfully simplifies planning for married couples compared to most other estate-tax states.

The federal exemption of approximately $15 million far exceeds Hawaii's **$5.49 million** exemption. Estates valued between these thresholds face Hawaii estate tax but no federal estate tax.

Both the federal and Hawaii taxes apply independently — the Hawaii tax is not a credit against federal liability. Hawaii's top marginal rate of 20% on taxable amounts over $10 million is actually half the federal top rate of 40%, but it applies at a much lower starting point.

Nonresidents with Hawaii real estate or tangible personal property in the state should evaluate whether their Hawaii-situated assets trigger filing requirements. The threshold is based on the proportion of Hawaii property to the total estate.

Hawaii's portability provision is a significant advantage. Unlike most estate-tax states, a surviving spouse can file a Hawaii estate tax return for the first-to-die spouse solely to elect portability, even if no tax is owed.

This eliminates the need for a credit shelter trust purely for state tax purposes, though such trusts may still be advisable for asset protection or other reasons.

Hawaii's community property opt-in system (Act 125, effective 2024) allows married couples to elect community property treatment via a community property trust. This creates potential basis step-up benefits on both halves of community property at the first death, an important consideration when considering both income tax and estate tax planning.

Run a Hawaii estate tax estimate with this calculator. It factors in Hawaii's specific exemption, rate brackets, and portability election — free for all jurisdictions.

Hawaii residents with taxable estates face a two-layer system: the federal estate tax (exemption of $15 million in 2025, top rate of 40%) and the Hawaii estate tax (exemption of $5.49 million). The gap between these exemptions creates a range where only the state tax applies.

An estate valued at $8 million, for example, may owe Hawaii estate tax while owing nothing at the federal level.

The federal return (Form 706) allows a deduction for state estate taxes paid, which partially offsets the double-taxation effect but does not eliminate it. The state tax is deductible on the federal return as an estate administration expense or under the state death tax credit rules, depending on the estate's circumstances.

The net result is that combined effective rates in Hawaii can exceed 45% on estates large enough to trigger both layers.

Planning for this interaction requires modeling both taxes simultaneously. Strategies that reduce the Hawaii taxable estate — such as lifetime gifts, charitable bequests, and irrevocable trusts — may also reduce federal exposure, but the relative benefit depends on where the estate falls within each jurisdiction's rate brackets.

Use our Hawaii estate tax calculator to model both layers side by side, and check the Hawaii probate cost calculator to estimate administration expenses.

Federal law permits a surviving spouse to use the deceased spouse's unused exclusion (DSUE) — commonly called portability — by timely filing Form 706 for the first-to-die spouse. This allows married couples to shelter up to $30 million federally without trust-based planning.

However, most estate-tax states, including Hawaii, do not offer portability of the state exemption.

This asymmetry makes bypass trusts (also called credit shelter trusts or B trusts) essential in Hawaii. At the first spouse's death, funding a bypass trust up to the Hawaii exemption amount preserves that exemption for state tax purposes.

Without the trust, the unlimited marital deduction passes everything to the surviving spouse tax-free at the first death — but the surviving spouse's estate then has only one Hawaii exemption, effectively wasting the first spouse's.

The bypass trust should be sized carefully. Overfunding it beyond the Hawaii exemption wastes the marital deduction benefit; underfunding it fails to capture the full state exemption.

For married couples with estates above $5.49 million but below $15 million, the bypass trust is the single most impactful planning tool available. Review your plan with the Hawaii estate tax estimator, and use the executor fee calculator to account for administration costs in your projections.

The $5.49 million Hawaii exemption establishes a lower threshold than the federal exemption, making proactive estate reduction strategies more urgent. Irrevocable trusts are the primary vehicle: irrevocable life insurance trusts (ILITs) remove life insurance proceeds from the taxable estate, spousal lifetime access trusts (SLATs) allow married couples to remove assets while retaining indirect access, and qualified personal residence trusts (QPRTs) transfer a home at a discounted gift tax value.

Annual exclusion gifting — currently $19,000 per recipient (2025) — reduces the taxable estate dollar-for-dollar without consuming the lifetime gift exemption. For Hawaii residents near the $5.49 million threshold, a sustained gifting program over several years can bring the estate below the state exemption entirely.

Charitable remainder trusts (CRTs) and charitable lead trusts (CLTs) offer additional reduction while generating income tax deductions.

GRATs (grantor retained annuity trusts) are particularly effective in low-interest-rate environments, transferring asset appreciation to beneficiaries with minimal or zero gift tax cost. For Hawaii business owners, entity-level planning — family limited partnerships, LLCs with valuation discounts, and buy-sell agreements — can reduce the reportable value of closely held interests for both state and federal purposes.

Compare strategies using the Hawaii estate tax calculator or find a Hawaii estate planning attorney.