Bank accounts and disputes

Why Adding a Child to an Account Backfires

Convenience is tempting, but joint ownership triggers lawsuits, sibling feuds, divorce liability, tax traps, and Medicaid penalties.

Do this first

If you want an adult child to write checks for bill paying, use a 'Convenience Signer' or a Durable Power of Attorney instead of adding them as a joint owner.

The 4 major dangers of joint bank accounts

Well-meaning parents often say: "I'll just add my daughter Sarah to my checking account so she can pay my electric bill." Here is why that causes disasters:

  1. Creditor & Lawsuit Exposure: If Sarah gets into a car accident, goes through a bitter divorce, or files bankruptcy, her creditors can legally seize 100% of her parent's life savings from that joint account.
  2. Accidental Disinheritance of Siblings: By law, joint tenancy has survivorship rights. When the parent dies, 100% of the money legally belongs to Sarah. Even if the parent's will says "divide everything equally among my 3 children," Sarah has zero legal obligation to share a penny.
  3. Medicaid Look-Back Penalties: If Sarah withdraws money for family expenses, Medicaid may view it as a disqualifying uncompensated transfer.
  4. Loss of Tax Step-Up in Basis: Putting a child on deeds or taxable brokerage accounts forfeits the full step-up in basis.

Sources

  • American Bar Association
  • National Academy of Elder Law Attorneys

Last reviewed: September 28, 2026