It happens more often than you would think, and it complicates the work rather than removing it. The return still has to be prepared as at the date of death, which means reconstructing an inventory for assets that have since moved to beneficiaries in several countries. Beneficiaries are then being asked for records about property they now treat as their own. Exposure on a late return is charged by reference to the form and the delay rather than to any tax finally payable, so a distributed estate with no tax to pay is not a resolved estate. Gather what the executor still holds first, then approach the beneficiaries with a specific list.
What is the late filing penalty for Form 706?
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The US estate tax return for a citizen or resident decedent, including foreign assets and foreign death taxes paid. The exposure on this kind of filing is charged by reference to the form and the delay rather than to the tax, which is why an unfiled year with no tax can still be expensive.
What a late filing costs
The US estate tax return for a citizen or resident decedent, including foreign assets and foreign death taxes paid.

When the rule breaks
Worldwide assets are in the base, so a US citizen who spent a life abroad leaves an estate that must be valued in several currencies and reconciled with foreign probate and death-tax filings before anything can be distributed.
Where to go from here
The full treatment — who it binds, the deadline, the penalty and the fixed fee — is on 706 — US estate return. Whatever you have is enough to start the conversation, including nothing but the dates.
Checked and signed off for the 2025 and 2026 filing seasons by Udit Gupta, International Tax, Cross-Border Tax & Transfer Pricing Expert, Legal Quotient Consultants. Published as general information. For a position on your own file, call the 24-hour helpline.
Files that look like this one
Estate distributed before anyone looked at the US return
The executor had closed the administration and paid the beneficiaries, then learned a US estate return had been required for the citizen who died. The assets had gone to more than one country. We rebuilt the date-of-death inventory from the executor's remaining papers, approached each beneficiary with a specific list rather than a general request, and valued every asset as at the date of death rather than the date it was transferred. The engagement produced a filed return, a reconstruction note distinguishing evidenced items from estimated ones, and a written chronology of how the omission arose.
Read how this one runsPortability raised years after the first spouse died
The question arrived with the second death: had anything been elected when the first spouse died, and if not, what was the position now. No return had been filed at the first death and the family assumed the door was closed. We reconstructed the first estate's worldwide inventory from bank and property records still obtainable, documented what that estate had consisted of, and set out the election question on those facts so advice could be taken on it. The engagement produced an evidenced inventory for the earlier death and a written statement of the position, rather than a decision taken on assumption.
Read how this one runsForeign death tax evidence rebuilt after the foreign estate closed
A late US estate return needed the foreign death taxes documented, and the foreign administration had been closed and its file archived. The family held only proof that money had left an account. We traced the advisers who had acted abroad, obtained the assessment and clearance from their retained records, had them translated, and matched each charge to the assets on the US inventory. The engagement produced a filed return with the foreign tax position evidenced rather than asserted, and a note identifying which documents were originals and which were reconstructions.
Read how this one runsReturn filed on stated assumptions for an unvaluable asset
The estate had been open for years over one asset: a minority interest in a family business abroad with no market and no recent accounts. Everything else was ready. We stopped trying to reach certainty, instructed a valuer on assumptions written down in advance, recorded what evidence existed and what did not, and filed the return with the reasoning attached. The engagement produced a filed estate return, a valuation file that shows its own limits, and a closed administration for beneficiaries who had been waiting on an asset none of them could sell anyway.
Read how this one runsExecutor who assumed a foreign will meant no US filing
The deceased was a US citizen who had made a will abroad and appointed a local executor, who reasonably concluded the estate was a foreign one. Citizenship put the worldwide estate in scope. We explained the basis of the obligation, assembled the inventory across currencies, reconciled it with the foreign probate schedule, and prepared the overdue return. The engagement produced a filed return, a reconciliation between the two administrations' asset schedules, and a short written explanation the executor could give beneficiaries who had been told for years that no US filing existed.
Read how this one runsTwo deaths in sequence with the earlier return outstanding
The later estate could not be settled because the earlier one had never been filed, and what that estate consisted of affected what the later one had to show. We took the deaths in order rather than starting with the recent one. The earlier inventory was reconstructed from records still held by institutions, the later estate was built on top of it, and the relationship between them was documented. The engagement produced filed returns that tell a consistent story, and a note explaining the order of work so nobody reopens the earlier one assuming it was guessed at.
Read how this one runsA Family Trust Abroad With Reporting on Both Sides
A trust settled in one country and a beneficiary living in another produces reporting for the trust, the settlor and the beneficiary, on different forms and different dates. The engagement maps who files what before anything is prepared.
Read how this one runsA Retirement Plan That Grows Tax-Deferred in Only One Country
Cross-border retirement accounts are recognised by treaty, but the deferral usually has to be elected rather than assumed. The engagement checks whether the election was made, makes it where it was missed, and reports the account on whichever side requires it.
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Performance income is taxed where the performance happens, and the deduction is usually taken at source on the gross fee before expenses. Recovering the difference is a filing exercise in the other country, and it only works if the tour, the residency and the withholding certificates were documented while the work was being done.
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Also asked about Form 706
The election lives on the return, so an estate that filed nothing has made no election. Whether it can still be made when the return is late is a question to be examined on the facts of that estate rather than assumed in either direction, and the answer depends partly on what the estate looked like at the first death. What is clear is that the position does not improve with waiting. Establish the worldwide inventory as at the first death while records still exist, document the size of the estate, and take advice on the election with those facts in hand rather than as a hypothetical.
Foreign death taxes paid are brought in on the return, so nothing is claimed until the return is filed. The real damage from delay is evidential. A foreign estate that has been closed and distributed no longer has an open file, and the assessment or clearance showing what was charged, and on what, becomes something you request as a favour. Where a foreign adviser acted, approach them before their retention period expires. Where the family holds only a payment record, say so in the return rather than describing it as an assessment, and keep the distinction between what is evidenced and what is reconstructed.
You value them on stated assumptions, and disclose the assumptions. A worldwide base means some assets sit in markets with no ready evidence — a part interest in family land, a private company, a property in a country with no public price record. Waiting for certainty is what keeps estates open for years. Instruct a valuer to opine as at the date of death on assumptions written down in advance, record what evidence was and was not available, and file. A figure with its reasoning attached can be discussed. An unfiled return cannot, and the delay is charged by reference to the form rather than to the difficulty.
The estate carries the return and the executor administers it, so the work and the correspondence sit with whoever is acting — including an executor who inherited the problem from a predecessor. Beneficiaries come into it differently. Once assets have been distributed they hold the records the inventory needs, and they may hold the assets a later liability would look to. That is a reason to bring them in early with a specific request rather than a general appeal, and to give them a written explanation of why a return is being prepared for a death they consider long settled.
Distributing first is what creates most of the late-filing problems we see. For a citizen or resident estate the base is worldwide, and the assets have to be valued and reconciled with foreign probate and any foreign death taxes before the picture is complete — which is precisely the exercise a distribution interrupts. Once property has gone to beneficiaries in several countries, the inventory has to be rebuilt from their records rather than the executor's. Where beneficiaries are pressing, the ordinary answer is a partial distribution with the inventory and valuations already settled, not a full one with the return outstanding.
Shares issued by a US company are generally US-situs for estate tax purposes, and a fund domiciled in the United States is a US company however global its holdings. A fund domiciled elsewhere that holds the same underlying stocks generally is not. That distinction — the domicile of the wrapper rather than the location of the investments — is why cross-border portfolios get restructured, and it should be confirmed against your own holdings before anything is sold. See US estate tax exposure for Canadians.
With paperwork built for both systems rather than one. In practice that means wills that work where each asset actually sits, an executor with authority a foreign bank or land registry will accept, clearance certificates before the estate distributes so the executor is not left personally exposed, and an estate tax exposure calculation done while the person is alive and can still act on it. Doing it afterwards costs more and forecloses most of the options. See cross-border wills and trusts.



