Updated October 8, 2026. Quick answer: Generally no, if you qualify for the federal exclusion. The Form 40 instructions say “Idaho conforms to the IRC as of January 1, 2026.” Gain above the exclusion is taxed at a flat rate: “the individual income tax rate is 5.3%.”
Idaho tax on home sale profit at a glance
| Item | What the documents say |
|---|---|
| Profit on your main home | Conforms to the Internal Revenue Code as of January 1, 2026; Form 40 starts from federal adjusted gross income |
| Rate on gain above the exclusion | Flat 5.3% |
| Collected at the sale | None found in the documents read |
| Source | Idaho State Tax Commission; Idaho Legislature |
What the Idaho documents say
The 2025 Form 40 instructions say “Idaho conforms to the IRC as of January 1, 2026.” and tell filers to “Enter your federal adjusted gross income from Form 1040”. Idaho’s income tax act states the legislature’s intent to make state law “identical to the provisions of the Federal Internal Revenue Code” in measuring taxable income. Under the federal statute, “Gross income shall not include gain from the sale or exchange” of a principal residence that meets the ownership and use tests, so an excluded gain never enters federal adjusted gross income. That is reasoning from two documents. The Idaho pages read never name section 121.
On the rate, the instructions say “the individual income tax rate is 5.3%.” The Tax Commission’s 2026 withholding table also uses 5.3%, so the rate is unchanged for 2026. Form 40 also has a capital gains deduction of 60% for some qualified Idaho property, including “Real property held for at least 12 months”; the instructions read do not say whether a main home qualifies, so this page does not apply it.
What the federal exclusion requires
Most state answers start here. The statute says “Gross income shall not include gain from the sale or exchange” of property that, during the five years before the sale, you owned and used as your principal residence for periods adding up to two years or more. The limit is “shall not exceed $250,000”, or $500,000 for a husband and wife who make a joint return and meet the statute’s conditions. See CMG’s home sale taxes page and exclusion calculator.
A worked example at a $400,000 gain
An illustration, not a return: a married couple in Idaho sells their main home with a gain of $400,000 and meets the federal ownership and use tests. The gain is below the $500,000 joint exclusion, so it is not in federal adjusted gross income and, on the documents read, $0 is taxed by Idaho. As a second illustration, computed below, suppose the gain were $600,000. The amount above the exclusion would then be $100,000 and, computed as that excess times 5.3%, the tax at the flat rate would be $5,300, before any deduction.
What is collected at the sale
The documents read show no Idaho withholding, prepayment or transfer tax on a home sale. That is a gap in what was read, not a statement that none exists; ask the closing agent.
What changes in 2026
Idaho: the Tax Commission’s 2026 withholding tables still apply a flat 5.3%, the same rate as 2025.
What the documents do not say
- The pages read never name section 121, so conformity is reasoned from the conformity statement and the federal starting point. Whether the 60% capital gains deduction reaches gain on a main home is not settled by the lines read. No sale-time rule was found. The instructions are for tax year 2025.
Common mistakes
- Assuming the 60% capital gains deduction removes tax on a home sale; the instructions read do not say a main home qualifies.
- Applying the flat rate to the whole gain; the rate applies to what remains after the federal exclusion.
- Assuming the answer for one state applies to another, or that the state answer changes the federal tax on the sale.
Related: home sale taxes, state tax on home sale profit, how Idaho taxes capital gains, Idaho retirement taxes, and home sale exclusion calculator.
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Answer againSources
- 2025 Form 40 Instructions, Individual Income Tax (EIN00046): https://tax.idaho.gov/wp-content/uploads/forms/EIN00046/EIN00046_03-02-2026.pdf
- Idaho Code Title 63, Chapter 30 (Income Tax): https://legislature.idaho.gov/wp-content/uploads/statutesrules/idstat/Title63/T63CH30.pdf
- Capital Gains (popular credits and deductions): https://tax.idaho.gov/taxes/income-tax/individual-income/popular-credits-and-deductions/capital-gains/
- Table for Percentage Computation Method of Withholding (EPB00744, 07-23-2026), annual payroll period: https://tax.idaho.gov/document-mngr/pubs_epb00744/
- Withholding tables updated for 2026 (press release, July 31, 2026): https://tax.idaho.gov/pressrelease/withholding-tables-updated-for-2026/
- Idaho Code Title 63, Chapter 30 (Income Tax), 63-3024: https://legislature.idaho.gov/wp-content/uploads/statutesrules/idstat/Title63/T63CH30.pdf
- 26 U.S.C. 121, Exclusion of gain from sale of principal residence (U.S. Code, GovInfo): https://www.govinfo.gov/content/pkg/USCODE-2023-title26/html/USCODE-2023-title26-subtitleA-chap1-subchapB-partIII-sec121.htm
Sources: the primary documents linked above, read on October 8, 2026. General information, not tax advice. Your own facts decide the outcome, and a tax professional or the state agency itself is the right place to confirm anything consequential.