DSUE Portability
Category: Estate & gift · Related form: Form 706
Deceased spousal unused exclusion that a surviving spouse may add to their own basic exclusion when a proper portability election is made on a timely Form 706.
How DSUE Portability fits 2026 planning
DSUE Portability sits inside gift and estate transfer tax, annual exclusions, and lifetime exemption usage. For tax year 2026, US Tax Tools treats year-scoped constants (brackets, contribution limits, wage bases, credit schedules) as separate datasets — so explanations of DSUE Portability should be read with the same year selected in any linked calculator.
Category focus: Estate & gift. Readers usually land on this page while comparing a paycheck estimate, a credit phaseout, or a retirement contribution room figure that depends on understanding DSUE Portability first.
Worked example
If the first spouse uses none of a $15 million exclusion, the survivor may elect to carry that unused amount forward.
Treat the example as a teaching sketch, not a filing position. Change filing status, state residency, or mid-year events and the same definition of DSUE Portability can produce a different cash outcome even when the glossary text stays the same.
What to watch for
Definitions of DSUE Portability can differ slightly across IRS publications, SSA rules, Marketplace subsidy worksheets, and state agencies. When two programs both say “income,” confirm which modification rules apply — MAGI for one credit is not always MAGI for another.
Legislation and inflation adjustments can move the dollar thresholds around DSUE Portability without renaming the concept. Prefer the effective date on the primary source (Rev. Proc., SSA notice, USDA table, or state DOR bulletin) over any blog summary — including this one if a later notice supersedes it.
On a filed return, DSUE Portability most often surfaces around Form 706. Read the official IRS instructions for that form for the tax year you are filing — glossary pages summarize concepts; they do not replace line-by-line worksheets.
Next step
When you are ready to model numbers, open the DSUE Portability related calculator on US Tax Tools. Engines keep tax-year datasets separate so a 2025 habit does not silently reuse a 2026 constant.
Related reading: Tax insights for longer 2026 explainers, Methodology for how engines store cents and traces, and Disclaimer for educational-use limits.