No state death tax
Idaho Estate and Inheritance Tax in 2026
No current Idaho estate or inheritance tax on a 2026 or 2027 death. Idaho's estate tax expired in 2004 and Idaho has no inheritance or gift tax; estate income still follows fiduciary rules.
Updated 5 primary sources citedEditorial policy
Idaho and federal death-tax estimate
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- Total estimated death taxes
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- Idaho death tax
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- Federal estate tax
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Full federal worksheet with credits, GST and payments · What each input means
Estimate federal estate tax after preparing the estate's valuations, deductions, gifts and valid additional exclusion. Historical liabilities, property in another jurisdiction and estate income require separate review.
The primary-source rule for Idaho
Idaho's Tax Commission explicitly lists no inheritance or gift tax and says its estate tax expired in 2004. Its guidance separately directs estates and trusts to fiduciary income-tax rules; the absence of a death tax does not exempt income during administration.
| Rule | Idaho position | Applies to | Primary source |
|---|---|---|---|
| Inheritance tax | None | Any date of death | Idaho State Tax Commission: estates and taxes |
| Gift tax | None | Lifetime gifts | Idaho State Tax Commission: estates and taxes |
| Estate tax | Expired in 2004; requirements for these older estates come from the Commission | Deaths before January 1, 2005 | Idaho State Tax Commission: estate tax for deaths before 2005 |
| Estate and transfer tax statute | Idaho Code title 14, chapter 4 is listed as repealed | Current code | Idaho Code title 14, chapter 4 |
Worked example: $5 million of lifetime gifts and a $12 million Idaho estate
An Idaho resident gave $5,000,000 of adjusted taxable gifts during life, paid no federal gift tax on them, and dies in 2026 with a $12,000,000 prepared gross estate and $400,000 of deductions. Idaho has no gift tax on the earlier transfers and no tax at death. Federal Form 706 adds the gifts back: $11,600,000 plus $5,000,000 is $16,600,000, which is $1,600,000 over the $15,000,000 basic exclusion, so the federal worksheet estimates $640,000.
Leave the gifts out and the same $11,600,000 taxable estate stays under the exclusion, with a federal estimate of $0. That gap is why the gift history belongs in the inputs even though Idaho itself never taxed the gifts.
- IRS Form 706 instructions: adjusted taxable gifts
- Idaho State Tax Commission: no gift or inheritance tax
Idaho affidavits and the community-income rule
Idaho Code § 15-3-1201 allows collection of a decedent's property by affidavit once 30 days have passed, when the entire probate estate, wherever located and net of liens, does not exceed $100,000 and no personal representative application is pending.
Idaho Code § 32-906 makes property acquired after marriage community property, and also treats income from separate property as community unless the spouses agree otherwise in writing — a rule that can move investment income onto the community side of the inventory.
Estate income survives the expiration of a death tax
Idaho's Tax Commission places estate and trust income guidance beside its statement about expired estate tax. That layout can confuse an executor who searches only for the word estate. Identify the tax base first: a value transferred at death is different from rent, interest or business earnings produced afterward. The source's absence of an inheritance or gift tax does not resolve fiduciary income reporting.
An Idaho beneficiary can receive principal and taxable income in the same distribution. Obtain the fiduciary's accounting and any required income reporting documents before classifying the entire payment as one inheritance amount. This page estimates transfer-tax exposure only. It does not calculate the beneficiary's income tax, basis, gain on a later sale or the estate's annual income liability.
If the decedent also owned Washington property, the Washington estate worksheet deserves separate attention. Its current rules do not become Idaho rules merely because the executor lives in Idaho. For the federal form below, prepare the gross estate and deductions consistently; a property valuation must not be reduced by an unverified percentage intended to stand in for probate costs.
Sources reviewed October 1–2, 2026. Settlement statutes read October 5, 2026. Tax Commission page and Idaho Code title 14, chapter 4 read October 12, 2026. Prepare federal inputs or compare Idaho with the other no-tax states.
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