Most people assume their estate plan comes down to the will, the trust, or the attorney they hired years ago. But one of the most expensive mistakes families make has nothing to do with legal documents at all. It’s how their assets are titled.
A surprising number of parents add an adult child as a joint owner on the house or brokerage account “to make things easier.” The intent is good: avoid probate, simplify access, keep things clean. But this well-meaning shortcut often triggers an avoidable tax bill later.
When someone dies, many assets receive a step-up in cost basis, meaning their tax basis resets to the value on the date of death. That step-up can eliminate decades of unrealized capital gains. But if a child is added as a joint owner, the IRS treats part of the asset as already belonging to the child. That portion does not receive a step-up at the parent’s death. When the asset is sold, the child may owe tax on gains that could have been wiped away with proper titling.
It’s an easy mistake to make and an expensive one to fix.
The good news is that probate-avoidance and tax-optimization don’t have to conflict. Tools like transfer-on-death (TOD) designations, pay-on-death (POD) accounts, and revocable living trusts can keep assets out of probate and preserve the step-up in basis. Even retitling a home into a properly drafted trust can protect both the family and the tax outcome.
A simple rule of thumb:
Avoid joint ownership solely for convenience. Use designations or a trust instead.
If you’re helping aging parents—or planning ahead for your own family—take an hour to review how the house, bank accounts, and investment accounts are titled. A small adjustment today can save your heirs thousands in capital gains taxes tomorrow.
If you’re unsure whether your current setup preserves the step-up, we can walk through the details and help you choose the right structure. Estate planning is more than paperwork. Done well, it’s one of the most cost-effective financial decisions you can make.