Montana Joint Tenancy Right of Survivorship: Benefits and Hidden Risks

Joint tenancy with right of survivorship is one of the most common probate-avoidance tools in Montana. When one joint tenant dies, the surviving tenant automatically becomes the sole owner — no probate, no will interpretation, no court involvement.

For married couples with straightforward situations, this works exactly as intended. But joint tenancy has significant limitations that catch people off guard, particularly in blended families and Medicaid planning scenarios.

How Joint Tenancy Works in Montana

Joint tenancy requires four "unities": the owners must acquire the property at the same time, through the same instrument, with equal ownership interests, and with equal rights of possession. The survivorship right is the defining feature — it operates automatically at death by operation of law.

To claim the property after a co-tenant's death, the surviving owner files a certified death certificate and an affidavit of survivorship with the County Clerk and Recorder. No probate petition, no waiting period (beyond the 120-hour survival requirement under MCA 72-2-114), and no attorney necessary.

For bank accounts, the surviving joint tenant simply presents a death certificate to the bank. For vehicles, the surviving owner files for a new title through the county motor vehicle division.

When Joint Tenancy Works Well

Married couples, first marriage, same children. If both spouses want everything to go to the survivor, and then to the same set of children, joint tenancy on the family home and major assets accomplishes this cleanly and cheaply.

Small estates. If your combined assets fall under the $100,000 small estate threshold (MCA 72-3-1101) after removing jointly held property, the combination of joint tenancy plus a small estate affidavit for remaining personal property can eliminate probate entirely.

Immediate access. Joint tenancy provides the surviving owner with immediate access to the property — no waiting for probate, no frozen assets. For a surviving spouse who needs the family home and bank accounts to continue daily life, this speed is critical.

The Risks Most People Miss

The Blended Family Problem

When a married couple holds their home in joint tenancy and one spouse has children from a prior relationship, the first spouse to die loses all control. The surviving spouse becomes the sole owner and can leave the property to anyone — their own children, a new partner, or a charity. The first spouse's children have zero legal recourse.

This isn't hypothetical. MSU Extension has documented this as one of the most common and destructive estate planning failures in Montana blended families. A Transfer on Death deed with layered beneficiaries provides similar probate avoidance while preserving the first spouse's ability to direct where their share ultimately goes.

The Second-Death Gap

Joint tenancy solves the first death perfectly. But when the surviving owner dies, every formerly joint asset is now solely in their name — and goes through probate unless additional planning exists (TOD deeds, beneficiary designations, or a trust).

Couples who rely exclusively on joint tenancy often leave the surviving spouse's estate completely unprotected against probate. The fix is simple: the surviving spouse should immediately execute a will and record TOD deeds on all real property after the first spouse's death.

Medicaid Exposure

Joint tenancy property is exposed to Montana's Medicaid Estate Recovery Program. Under MCA 53-6-167, DPHHS uses an "expanded estate" definition that reaches assets passing by right of survivorship — not just probate assets. Adding a child as joint tenant on your home doesn't protect it from Medicaid recovery after your death.

Accidental Gift Tax and Loss of Step-Up

Adding a child as joint tenant on your home while you're alive creates an immediate gift of their fractional interest. If the property is worth $400,000 and you add one child, you've made a $200,000 gift that may require filing a gift tax return.

Worse, the child's share of the property keeps your original cost basis rather than receiving a stepped-up basis at your death. If you paid $50,000 for the property decades ago, the child's share retains that $50,000 basis — creating a massive capital gains tax liability if they sell.

A TOD deed avoids both problems: no gift during your lifetime, and the full property receives a stepped-up basis at death.

Montana's Homestead Allowance and Exempt Property

Montana provides additional protections for surviving spouses that work alongside or independently of joint tenancy:

• Homestead allowance: $22,500 (MCA 72-2-412), which the surviving spouse can claim from the estate regardless of the will's provisions
• Exempt property: up to $15,000 in household furniture, automobiles, and personal effects (MCA 72-2-413)
• Family allowance: a reasonable allowance for maintenance during the estate administration period (MCA 72-2-414)

These allowances come off the top of the estate before distribution to beneficiaries. They're available whether or not joint tenancy is used, providing a financial floor for the surviving spouse.

Payable on Death Accounts: The Financial Account Alternative

For bank accounts and brokerage accounts, POD (Payable on Death) and TOD (Transfer on Death) designations accomplish the same instant transfer as joint tenancy — without the risks of shared ownership during your lifetime.

With a POD designation, you maintain complete control of the account. The beneficiary has no access or ownership while you're alive. They can't withdraw funds, they're not liable for the account, and there's no gift tax issue. At your death, they present a death certificate and the funds transfer immediately.

The combination of joint tenancy on the family home (for married couples), POD designations on financial accounts, and a will for everything else covers most Montana estates without the complexity or cost of a trust.

The Montana Basic Estate Planning Kit includes worksheets for coordinating all of these tools — joint tenancy, TOD deeds, POD designations, and beneficiary nominations — into a single, coherent plan that eliminates gaps and contradictions.

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