Oregon Estate Tax Calculator (2026 Exemption Limits & Inheritance Liabilities)

Oregon's $1,000,000 estate tax exemption is the lowest of any state that still taxes estates at the state level (barely a fifth of Maryland's threshold and a fraction of Connecticut's $15,000,000 line), which means a comparatively modest Oregon estate, sometimes not much more than a paid-off home and a retirement account, can trigger a state filing.

Above that threshold, Oregon taxes the excess progressively, from 10% up to 16%, calculated entirely separately from the federal system, whose exemption is more than thirteen times higher.

Oregon does not levy a separate inheritance tax, so the estate-level bill described here is the only state death tax that applies. Neighboring Washington, directly to the north, also taxes estates, at a considerably higher $3,000,000 exemption, so an Oregon family with property or heirs across the Columbia River can face two different state calculations depending on where each asset and beneficiary sits.

Because the exemption is set so low relative to other states, Oregon estate planning tends to focus less on whether the tax applies and more on how much of the estate it ultimately reaches.

The calculator starts from two numbers you enter: the gross estate at fair market value, and the marital, charitable, and administrative deductions the estate can claim. It subtracts the second from the first to get the net estate, then applies Oregon's own schedule to that figure. Nothing else feeds the result.

Below the exemption the tax is zero. Above it, Oregon does not apply one rate to the whole excess. Each dollar is taxed at the rate for the bracket that dollar falls into, so the schedule below is read slice by slice.

1. Value the gross estate. Fair market value at the date of death of all real property, business interests, securities, cash, and life insurance proceeds the decedent owned.
2. Subtract allowable deductions. Debts, administrative expenses, qualifying charitable bequests, and the unlimited marital deduction come off the gross figure. What remains is the net estate.
3. Test it against the $1,000,000 exemption. If the net estate is at or below that line, the answer is $0 and the calculation stops.
4. Walk the brackets. Each slice of the net estate above $1,000,000 is multiplied by its own rate and the products are added together. Quoting the top rate against the whole excess overstates the bill on any estate that does not reach the final bracket.
5. Subtract the tax. What is left of the net estate is what beneficiaries actually receive.

The ten brackets come from ORS 118.010(4). Because Oregon's schedule opens at 10%, the first dollar over the exemption is taxed harder than in any other state except Washington and Hawaii.

That is the entire computation. The calculator does not carry over a deceased spouse's unused exemption, add back lifetime taxable gifts, apply the generation-skipping transfer tax, discount closely held interests, or figure the separate federal return. Those sit under "What This Does Not Account For" below, not in the math above.

1. Start with the gross estate. This example uses a $5,000,000 gross estate: the fair market value of all property, business interests, equities, cash, and life insurance the decedent owned at death, before deductions.
2. Apply Oregon's exemption. Oregon taxes estates only above $1,000,000, so that amount passes tax-free and only the remainder is exposed to state tax.
3. Walk the graduated table (ORS 118.010(4)), not a single flat rate. A $5,000,000 estate falls in the table's $4,500,000-$5,500,000 bracket. Its statutory base tax at $4,500,000 is $367,500, plus 11.5% of the amount from $4,500,000 to $5,000,000: $367,500 + (11.5% × $500,000) = $425,000.
4. Net estate distributed to heirs. $425,000 in tax leaves $4,575,000 ($5,000,000 minus $425,000) to beneficiaries.
5. Why this isn't "excess × 16%." A flat 16% on the full $4,000,000 above the exemption would suggest $640,000; the actual graduated table produces $425,000 because most of that $4,000,000 falls in brackets well below the 16% top rate, which only starts above $9,500,000 of total estate value.
6. What this leaves out. This is Oregon's state-level computation only; federal estate tax is assessed separately under IRC § 2010.

Oregon taxes estates above $1,000,000, the lowest threshold of any state, and applies ORS 118.010(4)'s ten-bracket table to the full taxable estate rather than to the excess. The sweep crosses the threshold and then every band above it.

At $1,000,000, the exemption exactly. The tax is $0.00.

At $1,000,100, one hundred dollars later. The tax is $10.00, being 10% of the $100 above the line. Oregon's threshold is a clean edge with no phase-out behind it, which is the opposite of New York's structure.

At $1,500,000 and $1,500,100. The tax moves from $50,000.00 to $50,010.25, the step from the 10.0% band into the 10.25% band. Each $100 of estate now costs $10.25 instead of $10.00.

Higher up the table. At $2,500,000 the tax is $152,500.00; at $4,000,000 it is $312,500.00; at $5,000,000 it is $425,000.00, an effective rate of 8.50%. At $15,000,000 it is $1,902,500.00, an effective rate of 12.68% against a 16% top bracket.

The marginal cost of the next unit. At the $5,000,000 baseline, raising the estate to $5,001,000 moves the tax from $425,000.00 to $425,115.00, so each additional $1,000 costs $115.00, matching the 11.5% band. In the top bracket the cost is higher but not dramatically so: from $9,500,000 to $9,501,000 the tax moves from $1,022,500.00 to $1,022,660.00, or $160.00 per $1,000.

The reverse question: what do deductions buy? Entering $1,000,000 of allowable deductions against the $5,000,000 baseline estate reduces the taxable estate to $4,000,000 and the tax from $425,000.00 to $312,500.00. That million dollars of deduction is worth $112,500.00 of Oregon tax, an average of $112.50 per $1,000 deducted. Unlike New York, Oregon has no phase-out band in which a deduction returns more than the top marginal rate.

Right method against wrong method, priced. The standard error is applying the 16% top rate to the amount above the exemption: 16% of the $4,000,000 above $1,000,000 gives $640,000.00 against the engine's $425,000.00, overstating the liability by $215,000.00. The 16% band does not begin until $9,500,000 of estate value, and most of that $4,000,000 falls in bands between 10% and 11.5%.

What is not modelled. The engine applies no Oregon natural resource property credit, which can materially reduce the tax on qualifying farm, forest and fishing property. It applies no marital or charitable deduction of its own, no portability of a deceased spouse's exclusion, and no federal estate tax. It also performs no apportionment for a non-resident decedent with Oregon real property, which Oregon computes on a ratio of Oregon to total estate value.

• Portability of a deceased spouse's unused exemption. Most states with an estate tax, including this one, do not allow it at the state level, and the calculator does not apply it in either direction.
• Lifetime taxable gifts added back into the taxable estate, and any QTIP election, credit shelter trust, or state QTIP decoupling that would change what the taxable estate actually is.
• Valuation discounts for minority or non-marketable interests in closely held entities. Enter the discounted value yourself if the appraisal supports one.
• Federal generation-skipping transfer (GST) tax under IRC Chapter 13.
• Ancillary probate requirements for real property situated in other jurisdictions.
• Complex liquidity discounts for minority non-voting family business entities.
• State-specific inheritance taxes levied directly on beneficiaries (e.g. PA, NJ, MD, KY, NE).

• Assuming State Exemption Matches Federal: Forgetting that states like Oregon ($1.0M) and Massachusetts ($2.0M) tax estates far below the federal threshold.
• The "Cliff" Effect in Specific States: Failing to recognize that states like New York eliminate the exemption entirely if the estate exceeds 105% of the threshold.
• Out-of-State Real Property Exposure: Holding real estate in states with active estate taxes exposes non-resident estates to proportional state estate taxes.
• Failing to Fund Revocable Living Trusts: Assets held outside trust structures are subjected to public probate proceedings and statutory executor fees.

• Oregon Department of Revenue: Estate Tax Guidance (2026). oregon.gov/dor