Lesson 18 of 25 · 7 min

A change in basis at death, mechanically

In some systems the figure subtracted on a later sale is reset to a value that nobody ever paid.

What happens to basis when a holder dies is the largest structural difference between tax systems that a long-term borrower will meet, and systems genuinely split three ways.

Three mechanics, each of which some systems use:

The basis of assets held at death is adjusted to their value at that date, so gain accumulated during the holder's life is never recognised by whoever inherits.
The basis carries over unchanged, so the same accumulated gain is recognised whenever the inheritor eventually disposes of the asset.
Death is itself treated as a disposal, so the gain is recognised at that moment in the deceased holder's final period.

The three produce very different numbers from identical facts. A holding with a basis of $184,000 is worth $2,910,000 at the date of death, so $2,726,000 of gain has accumulated. Under an adjustment to value, the basis becomes $2,910,000 and a sale fourteen months later at $3,046,000 recognises $136,000. Under a carryover, the same sale recognises $3,046,000 − $184,000 = $2,862,000. Under a deemed disposal, $2,726,000 is recognised at the date of death and the inheritor begins from $2,910,000.

The gap between the first two is $2,862,000 − $136,000 = $2,726,000, which is precisely the lifetime gain. That is not a coincidence. The adjustment mechanic removes exactly the accumulated amount, no more and no less, while the deemed-disposal mechanic moves the same amount out of the future and into the present.

Which of the three applies, and with what exceptions, thresholds, elections and alternative valuation dates sitting around it, depends on the system and on facts about the holder that a lesson does not have. This is a description of three mechanisms and not a statement about any estate.

Key terms

Adjustment to value: Resetting an asset's basis to its value at the date of death, so the figure subtracted later is one nobody actually paid.
Carryover: Passing the original basis on unchanged, so accumulated gain remains attached to the asset in the inheritor's hands.
Deemed disposal: Treating death as though the asset had been sold, recognising the accumulated gain at that date rather than deferring it further.

Worked example

Three mechanics, one holding

A holding with a basis of $184,000, worth $2,910,000 at the date of death, sold by the inheritor fourteen months later at $3,046,000.

Gain accumulated during the holder's life: $2,726,000
Basis under an adjustment to value: $2,910,000
Recognised on the later sale: $136,000
Basis under a carryover: $184,000
Recognised on the same sale: $2,862,000
Difference between the two: $2,726,000

Same asset, same sale, same day. The entire difference between the two columns is the amount that accumulated while the first holder was alive.

Check yourself

A holding with a $184,000 basis is worth $2,910,000 at the date of death and sold fourteen months later at $3,046,000. What is recognised under an adjustment to value and under a carryover, and why is the gap the size it is?

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Educational only. Nothing in this lesson is investment, legal or tax advice, or a recommendation to enter into any transaction. Figures are illustrative and computed from the inputs stated in the lesson.