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

Montana charges no estate tax and no inheritance tax, and none of its neighbors do either, so nothing reduces a Montana estate at the state level. Montana is among the 38 states levying no separate state estate tax today.

Nor does Montana levy a separate inheritance tax on beneficiaries, so heirs here face no state-level death tax of either kind, regardless of how the estate is structured or how many beneficiaries ultimately share in it.

The only number that matters for a Montana estate, then, is the federal exemption (currently above $15,000,000 per individual for 2026), since nothing at the state level reduces what beneficiaries ultimately receive.

That simplicity is one reason retirees and high-net-worth households have historically relocated to no-tax states like Montana, though residency for tax purposes turns on where someone is actually domiciled, not just where they own a vacation home.

Montana is one of the largest states by land area but among the least densely populated, but that has no bearing on the calculation here: a Montana resident's estate is unaffected by changes to other states' exemption thresholds, since only Montana and federal law govern property held within it.

There is no Montana estate tax statute, so there is no exemption to clear and no rate schedule to walk. The calculator confirms that rather than computing against a threshold, and the state tax line is $0 at every estate size.

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. This is bookkeeping here rather than tax math, since no state rate is applied to the result.
3. Look Montana up in the state table. It is not among the twelve states that impose an estate tax, so no exemption threshold or bracket schedule is loaded.
4. Return $0. The net estate passes to beneficiaries with no Montana reduction, whether it is $500,000 or $50,000,000.

The federal estate tax is a separate return with its own exemption, above $15,000,000 per individual for 2026, and this calculator does not compute it. It also does not carry over a deceased spouse's unused federal exemption, add back lifetime taxable gifts, or apply the generation-skipping transfer tax.

1. Start with the gross estate. This example uses a $5,000,000 gross estate: the fair market value of all real property, business interests, equities, cash, and life insurance the decedent owned at death, before deductions.
2. Check Montana's estate tax status. Montana is one of the 38 states with no separate state-level estate tax, so there is no state exemption threshold or bracket schedule to apply.
3. Compute the state estate tax due. Because Montana taxes no estates at any size, the calculator returns $0.00 in state tax. A $5,000,000 estate and a $50,000,000 estate both owe Montana nothing.
4. Distribute the net estate. With no state tax subtracted, the full $5,000,000.00 gross estate passes to beneficiaries as the net estate distributed.
5. What this excludes. This is Montana's state-level result only; federal estate tax is computed separately against the $15,000,000+ federal exemption per individual for 2026 on IRS Form 706.

The schedule under the result is the clearest evidence on the page. On the $5,000,000 default it runs from a $833,333.33 tier in row 1 to a $10,000,000 tier in row 12, and the "Estate Tax Due" column prints $0.00 in all twelve rows. The "Net to Heirs" column is therefore a character-for-character copy of the "Estate Value" column: $833,333.33 against $833,333.33 in row 1, and $10,000,000.00 against $10,000,000.00 in row 12.

Push the input to its extreme and nothing changes. A $50,000,000 gross estate returns $0.00 of Montana tax and $50,000,000.00 distributed. There is no bracket in the Montana entry of the state estate tax table, because the entry is flagged as having no estate tax at all and the function returns before any schedule is consulted.

Each additional $1,000,000 of estate value costs $0.00 in state tax. That is the marginal figure, and unlike every other calculator in this family it is constant in both directions: adding value changes nothing, and removing it changes nothing.

The reverse question has no answer here, and that is the answer. "How much can pass before crossing the exemption" is the single most searched question about state estate tax, and on this page there is no crossing point at any value the input accepts, up to its $1,000,000,000 ceiling.

One output is easy to read backwards. The "Statutory Exemption Threshold" field prints $0.00. That is a sentinel meaning no schedule was loaded, not a statement that Montana taxes estates from the first dollar. The "Taxable Estate Above Exemption" field prints $0.00 for the same reason. Read together with a $0.00 tax and a 0.00% effective rate, the four outputs are consistent, but the exemption line on its own says the opposite of what a reader might assume.

The deductions field changes the distribution, not the tax. Enter $500,000 of deductions against the $5,000,000 gross and the Montana tax stays at $0.00 while the net estate distributed falls to $4,500,000.00. The whole schedule moves with it, because the tiers are built from the net estate rather than the gross: row 1 becomes $750,000.00 and row 12 becomes $9,000,000.00. In a taxing state that field would move the liability; here it is pure bookkeeping, and it is worth knowing that the schedule silently rescales when you use it.

• No inheritance tax is computed either. Montana levies none, so there is nothing for the calculator to omit on that front, but the same code path would return $0.00 for a state that did.
• 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.

• Montana Department of Revenue: General state tax administration; Montana levies no state-level estate tax, so only the federal estate tax applies. mtrevenue.gov