What it means
Wills must answer an uncomfortable question: what happens if someone named in the will dies first? Per stirpes, Latin for by roots or by branch, is the traditional answer.
Under per stirpes, the estate divides first at the generation nearest the deceased. If a son has died, his share does not vanish or spill to his siblings; it flows down his branch to his children, who split it equally.
The contrast is per capita distribution, where the estate divides equally among the living members of a defined group. Per capita counts heads; per stirpes follows bloodlines.
A simple example shows the gap. A grandmother leaves $900,000 to her three children per stirpes; one son has died leaving two daughters.
The living children take 300,000 each, and the dead son's 300,000 splits 150,000 to each granddaughter. Under per capita by generation, the same facts can produce a different result, with the pot at each generation pooled and split evenly among everyone alive at that level, cousins included.
The choice matters most in blended and asymmetric families. Per stirpes protects the children of a deceased heir, which is why wills and retirement accounts so often default to it.
Beneficiary designations on life insurance and retirement accounts usually offer both options, and the box ticked years earlier can redirect large sums when a beneficiary predeceases the account holder. The Wex legal encyclopedia at Cornell notes the phrase appears constantly in wills and retirement documents, a reminder that one Latin term quietly controls real money in millions of estates.
For a non-finance reader, the practical step is to check every beneficiary form and will for the distribution method, and to choose per stirpes deliberately when keeping wealth inside each family branch is the goal. Some jurisdictions now prefer a hybrid called per capita at each generation, which pools shares at the first living generation.
Families who want strict branch protection must say so explicitly where the hybrid is the default.
In practice
Real-world examples.
Example
A father's will leaves everything to his two children per stirpes; when one child dies first, her share passes to her own daughter rather than to her brother. The branch logic extends further: if the granddaughter had also died leaving a child, that child's slice would continue down the same branch.
Example
A retirement account holder ticks per stirpes on the beneficiary form, so if his son predeceases him, the account flows to the son's children in equal shares.
Example
A will silent on the method triggers a family dispute when a beneficiary dies, forcing the court to apply the jurisdiction's default rule, which may not match the family's wish.
Formula
Calculation
Per stirpes divides the estate into equal shares at the first generation, living or dead; each deceased heir's share passes to their descendants and splits equally among them, repeating down the tree as needed.
Worked example. A fictional estate of $900,000 is left to three children per stirpes, and one child has died leaving two daughters. The estate divides into three equal branches of $900,000 / 3 = $300,000. The two living children take $300,000 each, and the deceased child's $300,000 splits between the two granddaughters at $300,000 / 2 = $150,000 each. If one granddaughter had also died leaving a single child, that child would receive her whole $150,000 slice, because the branch continues downwards.Case study
Seen in the real world.
This case study is fictional and illustrative. Halvor, a made-up widower in Bergen, writes a will leaving his estate to his three children per stirpes. Years later his eldest daughter dies, leaving two sons, and Halvor never updates the will because the designation already covers the situation.
When Halvor dies, the notary divides the estate into three branches: his two living children take a third each, and his late daughter's third flows to her sons, who receive a sixth each. A cousin argues the pot should be split per capita among all four living descendants, which would have given the grandsons a quarter each and shrunk the living children's shares. The per stirpes designation settles the argument before it starts, exactly as Halvor intended.
Watch out
Common mistakes.
- Assuming a deceased beneficiary's share automatically goes to their children; without per stirpes, it may be divided among the surviving named beneficiaries instead.
- Confusing per stirpes with per capita, which pools and splits by headcount at a generation and can shift significant sums between branches.
- Never revisiting beneficiary forms after births, deaths, and divorces, because the designation made decades earlier still controls the money.
Questions
People also ask.
What does per stirpes mean in plain English?
By branch: each child of the deceased takes an equal share, and a deceased child's share passes down to their own children equally.
How is per stirpes different from per capita?
Per stirpes preserves shares by family line, while per capita divides the pool equally among the living members of the named generation.
Does per stirpes apply to retirement accounts?
Only if the beneficiary designation says so; account holders choose the method on the form, and the default varies by provider and jurisdiction.
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