A lot of people think adding someone to a deed was pretty straightforward. You fill out some paperwork, file it, and it’s done. But the more clients I work with who are navigating co-ownership, the more I’ve seen how much can go sideways when the structure isn’t right.
I sat down with an estate and probate attorney I trust and asked them what they see go wrong most often. Here’s what they told me.
Mistake #1: Not Knowing Which Type of Joint Ownership You’re Choosing
Joint tenancy with right of survivorship and tenancy in common are not the same thing, and choosing the wrong one has real consequences.
With joint tenancy, when one owner dies, their share automatically passes to the surviving co-owner. No probate, no will required. But that also means the deceased owner’s share can’t go to anyone else, not a child from a previous relationship, not another family member. Your estate plan gets overridden entirely.
With tenancy in common, each owner holds a defined percentage and can leave their share to whoever they want through a will. If there’s no will, that share goes through probate and could end up with someone you never intended to co-own property with.
These two structures lead to very different outcomes. Know which one your deed is being titled in before you sign it.
Mistake #2: Never Talking Through Expectations
A parent adds an adult child to the deed, assuming they’ll help cover expenses. The child assumes they’re being set up to inherit the home. Nobody says any of this out loud.
Then something shifts. The parent needs to sell to fund care. The child isn’t ready. The property needs major repairs and nobody budgeted for it.
Without a written agreement, both owners have equal legal standing and neither can force a sale without the other’s cooperation. If it gets bad enough, either party can pursue a partition lawsuit. That process is expensive, slow, and hard on families.
Before anyone’s name goes on a deed, be specific. What happens if one person wants to sell and the other doesn’t? Who pays property taxes? What if one owner hits a financial crisis?
Mistake #3: Ignoring Your Co-Owner’s Financial Situation
When someone’s name goes on your deed, their financial situation connects to your property.
A creditor judgment against them could result in a lien on your home. A divorce could give their spouse a legal claim to their ownership share. A bankruptcy filing can pull the property into the proceedings.
The attorney I work with is direct about this: before anyone goes on a deed, you need a clear picture of their finances. It feels like a personal question. Legally, it’s a necessary one.
Mistake #4: Missing the Gift Tax Implications
Adding someone to your deed can trigger a reportable gift if the value of their share exceeds the annual gift tax exclusion, which is $19,000 per person as of 2026. If it does, a gift tax return may need to be filed. Actual tax owed depends on your lifetime exemption usage (currently $15,000,000), but the reporting requirement alone catches people off guard.
Mistake #5: Getting the Capital Gains Basis Wrong
This one surprises a lot of people.
When you add someone to a deed during your lifetime, they take on your original cost basis in the property. When the home eventually sells, its taxable gain is calculated from that original purchase price, not the current market value. If you’ve owned the home for decades, that gap can be significant.
Compare that to inherited property. When someone receives a home through a will or trust, they typically get a stepped-up basis to fair market value at the time of inheritance. That can dramatically reduce what’s owed in capital gains when the property sells.
The difference between gifting a property and inheriting one can mean tens of thousands of dollars in taxes. Talk to a CPA before you decide which route makes more sense.
Mistake #6: Waiting Until There’s Already a Problem
The estate and probate attorney I refer clients to says this comes up constantly. People make a quick deed change because the intention felt obvious, and then realize later it created tax issues, legal complications, or family conflict they didn’t anticipate.
Changing a deed after the fact isn’t always simple. Sometimes it creates its own set of problems. Getting it right the first time is almost always easier.
Talk to the Right People First
If you’re thinking about adding someone to your deed or sorting through co-ownership on an inherited property, I’m happy to connect you with a trusted local estate attorney. Reach out anytime.
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