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Short answer: In Idaho, most property acquired during marriage belongs to both spouses equally. That means that each spouse can only give away their own half. Done right, community property also delivers a full capital-gains basis reset at the first spouse's death.
The ownership rule. Idaho is one of nine community property states. Earnings and property acquired during the marriage are presumptively community - owned 50/50 - regardless of whose name is on the account or title, and usually regardless of who paid for something. Separate property is what you owned before the marriage, plus gifts and inheritances received individually (Idaho Code § 32-903). At death, your will or trust controls your half of the community property and your separate property; you cannot give away your spouse's half.
The tax advantage most people miss. Under federal law (IRC § 1014(b)(6)), when the first spouse dies, BOTH halves of community property receive a new income-tax basis equal to fair market value - not just the decedent's half, as with joint tenancy in separate-property states. For a couple whose Boise-area home or farm ground has appreciated for decades, this 'double step-up' can erase an enormous embedded capital gains bill. It's a major reason married Idaho couples should think twice before holding appreciated property as plain joint tenants: bad titling can forfeit half the benefit.
The survivorship option. Since 2008, Idaho couples can hold real estate as community property with right of survivorship (§ 15-6-401) - combining the tax treatment of community property with automatic transfer to the survivor, no probate needed at the first death.
Moved here from another state? Property you acquired while living in a separate-property state gets 'quasi-community property' treatment at death (§ 15-2-201) - one more reason transplants to the Treasure Valley should have an Idaho attorney review the plan they brought with them.
Community property analysis - what's community, what's separate, how things got commingled - is where online forms and out-of-state documents most often go wrong in Idaho. It's worth an hour with a lawyer who works in this system daily.
Liberty Law Idaho offers flat-fee estate planning and family law services with prices published up front. Schedule a consultation - in person in Meridian or virtually anywhere in Idaho - at libertylawidaho.com or (208) 273-8825