Glossary term
Deceased Spousal Unused Exclusion (DSUE)
DSUE is the unused federal estate and gift tax exclusion a deceased spouse may transfer to a surviving spouse through a timely portability election.
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What Is DSUE?
Deceased spousal unused exclusion, or DSUE, is the portion of a deceased spouse's federal estate and gift tax exclusion that can be transferred to a surviving spouse. The transfer is commonly called portability.
DSUE matters because a surviving spouse may be able to add the deceased spouse's unused exclusion to their own available exclusion for later lifetime gifts or estate transfers. The election is made by filing a federal estate tax return for the deceased spouse's estate.
Key Takeaways
- DSUE stands for deceased spousal unused exclusion.
- It can allow a surviving spouse to use a deceased spouse's unused federal exclusion amount.
- The executor generally must make a portability election on Form 706.
- DSUE is a federal estate and gift tax concept, not a state inheritance rule.
- Portability can be useful even when the first spouse's estate owes no federal estate tax.
How DSUE Works
When a married person dies, that person's estate may use part, all, or none of their federal exclusion amount. If some exclusion remains unused, the estate may elect to transfer that unused amount to the surviving spouse.
The surviving spouse can then potentially use the DSUE amount for later taxable gifts or for estate tax at the surviving spouse's death. The election does not happen automatically. It depends on a properly filed estate tax return and the rules in effect for the decedent's estate.
Portability Election Basics
Item | Practical meaning |
|---|---|
Decedent | The spouse whose unused exclusion may be transferred. |
Surviving spouse | The spouse who may later use the DSUE amount. |
Form 706 | The federal estate tax return used to make the portability election. |
Unused exclusion | The portion not consumed by the first spouse's taxable estate and taxable gifts. |
Where DSUE Fits in Estate Planning
DSUE can reduce federal transfer-tax exposure for a surviving spouse, but it is not a replacement for all estate planning. Portability generally applies to federal estate and gift tax exclusion planning. It does not automatically solve state estate tax issues, asset titling, creditor concerns, remarriage planning, trust control, or generation-skipping transfer tax planning.
Families sometimes overlook DSUE because the first spouse's estate is below the filing threshold. A portability election may still be worth evaluating because the surviving spouse's later estate could be larger due to asset growth, inheritance, life insurance, retirement assets, or changes in tax law.
What Can Go Wrong
The biggest practical risk is missing the filing requirement or assuming portability is automatic. A second risk is treating DSUE as permanent planning certainty. The available exclusion, estate values, marital status, and federal law can change before the surviving spouse dies.
Records also matter. Executors may need asset values, prior gift information, deductions, and marital information even when the estate does not expect to pay tax.
The Bottom Line
DSUE lets a surviving spouse potentially use a deceased spouse's unused federal estate and gift tax exclusion. It is powerful because it can preserve transfer-tax capacity, but it depends on a timely and properly handled portability election.