The Marital Deduction And Deferred Tax

Leaving everything to a spouse is the simplest plan available and frequently produces no tax at the first death. What it does is postpone the question.

How the deduction operates

Property passing to a surviving spouse is generally deducted from the taxable estate, so no transfer tax arises on that portion at the first death.

The rationale is that a married couple is treated as an economic unit, and tax is imposed when wealth leaves that unit rather than when it moves within it.

The deduction is usually unlimited in amount, which is why simple plans leaving everything to the survivor produce no immediate liability.

What deferral costs

The assets are now in the survivor's estate. Everything they inherited, plus their own property and any growth on both, is measured at the second death.

If the combined estate exceeds the available allowance at that point, tax falls on the whole excess, having been avoided entirely at the first death.

Growth over the survivor's remaining years compounds inside the taxable estate, so a long survivorship can substantially increase the eventual liability.

The wasted allowance problem

The first spouse to die has their own allowance. A plan leaving everything to the survivor may use none of it, effectively discarding it.

Traditional planning addressed this with a trust funded at the first death up to the available allowance, sheltering that amount and its future growth from the second estate.

Portability provisions in some systems allow an unused allowance to transfer to the survivor instead, though they typically require a return to be filed to claim it.

Conditions on the deduction

The deduction generally requires the survivor to receive property outright or through a qualifying interest, since a terminable interest may not qualify.

That rule exists to prevent a deduction for property that is really passing to someone else after a limited period of spousal enjoyment.

Specific trust forms are recognised as qualifying, which is why plans for blended families use defined structures rather than improvised limitations.

Where the survivor is not a citizen

Many systems restrict or deny the unlimited deduction where the surviving spouse is not a citizen, on the reasoning that the assets may leave the taxing jurisdiction.

Specialised trust structures exist to preserve deferral in those cases, with requirements about trustees and withholding that must be satisfied precisely.

Marital deduction rules, portability and non-citizen provisions vary by jurisdiction and change. This is general information rather than tax advice, and a qualified professional should review any specific plan.