If you’ve read that the federal estate-tax exemption is $15,000,000 in 2026 and did the math for your marriage — “so we’re covered up to $30,000,000” — you’ve done the arithmetic a lot of families do. It’s also not quite right, and the gap between that arithmetic and what actually happens on paper is where estate plans quietly fail. Portability can move your exemption, but it can’t retitle your house. To learn more, schedule your consultation with our team at DuPont Law Group.

The $15 Million Estate Tax Figure Is Per Person, Not Per Household

The $15,000,000 exemption for 2026 is a per-person number. It’s what the IRS applies to one estate, at one death — not a figure that automatically doubles for a married couple. A surviving spouse can use whatever exemption the first spouse didn’t use, but that transfer isn’t automatic. It happens through an election called portability, and portability only happens if someone files for it.

We’ve seen this play out for families we’ll call the Hassans — a composite, not a real client — who read the $15,000,000 headline, assumed $30,000,000 of protection, and canceled a planning conversation they’d already scheduled. The math felt finished. It wasn’t.

Portability Is a Filing, With a Deadline

To pass the unused exemption to a surviving spouse, the estate’s executor has to file a federal estate tax return — Form 706 — and elect portability on it. The return has to be timely: nine months after the date of death, ordinarily, with one extension available. Filing Form 4768 on or before that nine-month deadline buys an automatic six-month extension to file, which stretches the window to fifteen months if it’s used.

There’s no separate grace period for families who simply didn’t know the filing existed — which is exactly the situation the exemption headline creates. Hearing “$15 million” tells you nothing about a deadline. It’s easy to miss a date you didn’t know you had.

Being Under the Estate Tax Threshold Doesn’t Mean There’s Nothing to File

Here’s the part that trips up estates that will never owe a dollar of federal estate tax: if your estate is comfortably under $15,000,000, you don’t owe tax and you’re not required to file — unless you want the unused exemption to be available to your spouse later. Wanting that requires the same instrument a taxable estate requires: a timely, complete Form 706. The size of the estate answers whether tax is owed. It doesn’t answer whether the option was preserved for the survivor.

If the Filing Window Was Missed, the Door Isn’t Necessarily Closed — But It’s Narrow

For estates that had an independent filing requirement — meaning they were over the threshold regardless of portability — missing the ordinary window closes the door. No extension applies.

For estates that were under the threshold and simply missed the deadline, there’s a narrower path: a simplified method that allows a complete Form 706 to be filed up to the fifth anniversary of the date of death, with a specific legend required at the top of the return. No fee applies to use it. But it only reaches certain estates — the ones without an independent filing requirement, where a spouse survived, and where no return was already filed on time. Outside those conditions, the only path back is a private letter-ruling request, a longer and more involved process.

Whether a given estate qualifies for the simplified path is not a rule of thumb. It’s a set of conditions that has to be tested against the actual facts of the estate — which is a conversation with an attorney, not a generalization from something you heard once.

Filing for Portability Is Not the Same Job as Defending Your Estate Plan or Financial Plan

Everything above is about one thing: moving a number from one spouse’s estate to the other’s, on a federal tax return. It says nothing about whether your house is titled the way your plan assumes, or whether the beneficiary form on your IRA still names who you think it names.

In our 4D Estate Plan™, that second ‘D’ is for Defend — making sure your assets and account titles actually align with your plan, so it works when it’s needed instead of failing on a detail nobody caught. A timely Form 706 and a properly defended plan solve two different problems. Filing one doesn’t finish the other.

If you’ve recently filed for portability, or expect to, it’s worth putting two things on the same table: any portability paperwork you have, and your current deed, account titles, and beneficiary confirmations. Seeing where they agree — and where they don’t — is often the fastest way to find out whether your plan is actually finished or just looks finished.

If that’s a conversation worth having, we’re glad to walk through it with you. To learn more about how portability can move your exemption but not retitle your house, schedule your consultation with DuPont Law Group today.

Educational information only — not legal, tax, or investment advice. Every estate’s facts are different; talk with your own attorney and CPA about your situation.