Introduction
Leaving everything to your spouse "tax-free" sounds like the end of the story. It usually isn't. The U.S. marital deduction generally defers federal estate or gift tax until a later transfer, often the surviving spouse's death.
This guide explains the U.S. federal marital deduction in plain language and separates it from Australian tax rules. We cover eligibility, qualifying trusts, portability, limits and cross-border planning for Australians with U.S. connections.
This article is general education, not advice. Outcomes depend on citizenship, residency, domicile, asset location, ownership, trust wording, filing history and current law. Get tailored advice in each relevant jurisdiction.
Key Takeaways
- Qualifying spousal transfers can pass without immediate U.S. federal estate or gift tax, subject to eligibility rules.
- The deduction is generally a deferral, not a permanent exemption.
- Outright gifts, QTIPs, QDOTs, bypass trusts and portability each serve different goals.
- A U.S. result does not decide the treatment of Australian assets, trusts or superannuation.
What Is the Marital Deduction and How Does It Work?
The estate marital deduction under IRC 2056(a) removes qualifying property passing from a decedent to a surviving spouse from the taxable estate. IRC 2523(a) does the same for qualifying lifetime gifts. It is not a fixed-dollar allowance.
It is also not an income-tax deduction, a capital gains exemption, an inheritance tax or an Australian tax deduction. It reduces the U.S. transfer-tax base only.
The mechanics at the first death
- Identify the gross estate under the applicable valuation rules.
- Determine which property passes to the surviving spouse.
- Deduct qualifying property that meets IRC 2056 requirements.
- Apply the exclusion and rate to the remaining taxable estate.
Property can pass by will, revocable trust, beneficiary designation or joint ownership, but the arrangement must meet the statutory and trust requirements.
Why it defers rather than erases
When the survivor dies, assets received (and not spent or given away) may sit in the survivor's taxable estate. Under IRC 2044, QTIP property previously deducted is included in the survivor's gross estate. Inclusion does not by itself mean tax is payable, because the survivor's own exclusion may absorb it.
A simple hypothetical
Assume a couple with a combined estate and a modest family home. Both examples use current rules; confirm details against IRS guidance.
- Outright transfer: Everything passes to the survivor with no tax at the first death. The first spouse's exclusion goes unused unless portability is elected, so the survivor's estate holds everything plus growth.
- Bypass trust: The first spouse funds a trust using their exclusion. The survivor receives defined benefits, and later growth in that trust generally stays outside the survivor's estate.
Who Qualifies and Which Transfers Are Eligible?
Eligibility depends on a few core requirements:
- A legally recognised marriage
- A transfer from the decedent's estate or the donor
- Property passing to the spouse
- Compliance with U.S. federal requirements
Treasury Regulation 301.7701-18 recognises a foreign marriage if at least one U.S. state would recognise it. An Australian marriage will generally meet this test.
The citizen-spouse rule
IRC 2056(d) generally denies the estate marital deduction when the surviving spouse is not a U.S. citizen. U.S. residence alone does not fix this. A properly structured QDOT can restore qualifying treatment.
For lifetime gifts to a non-citizen spouse, there is no unlimited deduction. A separate annual exclusion of $194,000 applies for 2026 to qualifying present-interest gifts.
Qualifying forms and the terminable-interest rule
Qualifying forms include:
- Outright transfers
- Life-estate trusts with a qualifying power of appointment
- QTIP trusts
The exact trust terms control the result.
The terminable-interest rule denies the deduction where the spouse's interest ends on a time or event while someone else can then enjoy the property. Treasury's example is property to a spouse for life, with remainder to another person. Without an exception, no deduction applies.
Procedure
- File an accurate Form 706 where required
- Make the QTIP election on Schedule M (it is irrevocable)
- Administer the trust correctly and keep records
- Confirm deadlines in the current IRS instructions
Which Trusts and Planning Strategies Can Use It?
Outright transfer
The simplest route. The survivor gets full ownership and flexibility. The trade-off is losing control over who ultimately inherits.
QTIP trust
A QTIP gives the survivor all income at least annually for life, with no power to appoint the property to others during their life. The first spouse decides who receives the remainder. The executor elects QTIP treatment, and the property is included in the survivor's estate.
Consider a QTIP for:
- Blended families
- Remarriage concerns
- Creditor exposure
- A survivor less comfortable managing money
- Preserving assets for named remainder beneficiaries
QDOT
A QDOT lets a non-citizen surviving spouse receive marital deduction treatment. IRC 2056A requires a U.S.-citizen individual or domestic-corporation trustee, withholding rights over principal distributions, and an executor election.
Principal distributions and assets remaining at the survivor's death can trigger the deferred tax, with exceptions for income and qualifying hardship. A label alone is not enough; the trust needs an otherwise qualifying marital interest.
Citizenship, domicile, treaty provisions and asset location can materially change the analysis for an Australian spouse.
Bypass trust and portability
A bypass (credit-shelter) trust uses the first spouse's exclusion rather than the marital deduction for the sheltered share, while still providing defined benefits to the survivor.
Portability is different. The executor files a timely, complete Form 706 to transfer the deceased spouse's unused exclusion (DSUE) to the survivor. Under Rev. Proc. 2022-32, some estates can file late, up to the fifth anniversary of death, if conditions are met.
Portability does not transfer the generation-skipping transfer (GST) exemption, and an estate of a non-resident non-citizen cannot elect it.
| Factor | Bypass trust | Portability |
|---|---|---|
| Future growth | Generally outside survivor's estate | Included in survivor's estate |
| Basis at survivor's death | Generally no second adjustment | Adjustment for included assets |
| Generation-skipping (GST) exemption | Can be allocated | Not transferred |
| Cost and control | Higher administration, more control | Simpler, less control |
No strategy is universally better. US state taxes, creditor protection and costs all matter.
What Tax Benefits and Limitations Should Couples Understand?
The main benefit is postponing U.S. federal estate or gift tax at the first transfer. Later exposure depends on the survivor's estate size, exemptions, growth and the law then in force.
Current 2026 U.S. federal figures
| Measure | 2026 |
|---|---|
| Basic exclusion | $15,000,000 per individual |
| Top rate | 40% |
| Form 706 filing threshold | Gross estate plus adjusted taxable gifts above $15,000,000 |
| Annual gift exclusion | $19,000 per recipient |
The 2026 Form 706 instructions note that the filing test is not based on the estate left after the marital deduction. Amounts are in U.S. dollars.
Limitations
Leaving everything outright can leave the first spouse's exclusion unused, or enlarge the survivor's estate. Portability and bypass trusts address that, in different ways.
Also weigh:
- Basis under IRC 1014, which can move up or down
- Capital gains on later sales
- State estate or inheritance taxes (for example, New York and Washington levy estate tax, and Pennsylvania levies inheritance tax)
- Generation-skipping transfer (GST) tax
- Liquidity needs and trustee fees
- Asset-protection goals
How Does the Marital Deduction Apply to Australians With U.S. Connections?
Start with a jurisdiction checklist
- Each spouse's citizenship and tax residence
- Where the deceased was domiciled (U.S. estate-tax residence turns on domicile, not income-tax residence)
- Whether assets are U.S.-situs or Australian-situs
- How ownership is recorded
- Whether a U.S. return is required
For non-resident non-citizens, U.S. real property and shares in U.S.-incorporated companies are U.S.-situs, even if held through foreign custody. Qualifying U.S. bank deposits generally are not.
The statutory credit is $13,000, commonly described as sheltering $60,000, and Form 706-NA generally applies above that. The 1953 U.S.-Australia estate and gift conventions are in force, but treaty relief is a separate analysis, not an automatic full exclusion.
The Australian side
Australia has no inheritance or estate tax, so there is no direct equivalent of the marital deduction. Separate rules apply:
- CGT is generally disregarded on transfers on death; the beneficiary framework in section 128-15 is not spouse-only
- Post-CGT assets generally keep the deceased's cost base, unlike the U.S. basis reset
- CGT event K3 can apply when assets pass to a foreign-resident beneficiary
- Superannuation death benefits depend on dependant status and benefit type; a lump sum to a tax-law dependant is tax-free
- Australian residents declare worldwide income on later dividends, rent and gains
- Family provision claims are succession-law matters, not tax deductions
Document checklist
- Wills and trust deeds in each jurisdiction
- Beneficiary designations and ownership records
- Prior gifts and valuations
- Business interests
- Tax returns
- Citizenship evidence
- Advice received to date
Australians with U.S. assets or dual-jurisdiction estates may find VJM Global's cross-border tax, accounting and compliance support useful for coordinating financial records and reporting. Estate-planning documents and legal opinions should come from qualified advisers in each relevant jurisdiction.
Frequently Asked Questions
What qualifies for the marital deduction?
A qualifying property interest passing to a legally recognised spouse, subject to citizenship and terminable-interest rules. Confirm current U.S. rules before relying on it.
What trusts qualify for the marital deduction?
QTIP and life-estate trusts with a qualifying general power of appointment qualify. A QDOT also needs an underlying qualifying marital interest. Trust terms, elections and citizenship decide eligibility.
What is the marital deduction for 2026?
It is unlimited for qualifying transfers, not a dollar figure. Don't confuse it with the $15 million exclusion or the $19,000 annual gift exclusion.
Can I use my late wife's inheritance tax allowance?
"Inheritance tax allowance" is UK terminology. In the U.S., the executor can elect portability of the unused exclusion (DSUE) by filing Form 706 on time, or under Rev. Proc. 2022-32 where eligible.
Does Australia have a marital deduction?
No. Australia has no estate tax, and its death-related CGT rules are broader than spouse-only relief. With cross-border assets, get coordinated Australian and U.S. advice.
Is the marital deduction a permanent tax exemption?
Generally no. QTIP property is included in the survivor's estate, and QDOT rules impose deferred tax on specified events. Trust design, portability, basis and growth planning all matter.
