In estate planning, per stirpes is a Latin phrase meaning “by the branch,” and it controls what happens to a beneficiary’s share if that beneficiary dies before you do. When a will, trust, or beneficiary form says assets pass “to my children, per stirpes,” it means that if one of your children dies first, that child’s portion flows down to their own children rather than getting split among the surviving siblings. The designation keeps wealth moving within each family line, and it shows up in wills, trusts, and beneficiary forms for retirement accounts and life insurance policies.
How the Distribution Actually Works
Division starts at the first generation below you. If you leave your estate to your children per stirpes, the estate is split into equal shares at the children’s level. Each living child takes their share outright. For any child who died before you, that share doesn’t disappear and doesn’t get absorbed by the surviving children. It drops down to that deceased child’s own children, split equally among them.
A concrete example. You have three children and a $900,000 estate. Each child’s branch is allocated $300,000. Two children survive you and each receive $300,000 directly. Your third child died before you but left two kids. Those two grandchildren split the $300,000 branch equally, receiving $150,000 each. The surviving children still get their full one-third shares; the grandchildren only inherit what would have gone to their parent.
The division always begins at the children’s generation, even if every one of your children has died before you.1Legal Information Institute. Pure Per Stirpes In that case the estate is still carved into as many shares as you had children (skipping any child who left no descendants), and each share flows down through that child’s line. This can continue through several generations, with shares splitting again at each level.
What Happens When a Branch Has No Descendants
If one of your children died before you and left no children or grandchildren, that branch effectively dies out. A deceased child with no living descendants is disregarded when counting shares.1Legal Information Institute. Pure Per Stirpes The estate gets divided only among the branches that have someone alive to inherit.
Back to the $900,000 example: if you had three children but one died with no descendants, the estate splits into two shares of $450,000, not three shares of $300,000 with one share floating in limbo. People sometimes assume the extinct branch’s share passes to that child’s surviving spouse or to the other grandchildren. It doesn’t. The share simply never exists because there is no one in that branch to receive it.
Why Grandchildren Can Inherit Unequal Amounts
One surprising feature of per stirpes is that cousins in the same generation can receive very different amounts. The math depends on how many siblings share a branch, not on how many grandchildren exist overall.
Say you have two children, each with kids of their own. Child A dies before you leaving four children. Child B also dies before you but leaves only one child. Under per stirpes, your estate splits in half. Child A’s four children split that half equally and receive one-eighth of the estate each. Child B’s sole child gets the entire other half. That single grandchild inherits four times what each of Child A’s children receives, even though all five are in the same generation.
This is the main criticism of per stirpes. Studies have found a strong popular preference for grandchildren in the same generation to inherit equal amounts.2California Law Revision Commission. Study L-602 – Probate Code – Intestate Succession Per Stirpes or Per Capita Distribution If equal treatment across cousins matters to you, a different distribution method may fit better.
Per Stirpes Compared to Per Capita
Per stirpes is not the only way to distribute an estate among descendants. Two alternatives show up often in estate planning documents and in state intestacy laws, and confusing them can produce results you didn’t intend.
- Per stirpes (by the branch). Division starts at the children’s generation. Each branch gets an equal share, and a deceased child’s share passes down within that branch only. Grandchildren from different branches can receive very different amounts.
- Per capita (by the head). Each living beneficiary at the designated generation receives an equal share. If one of your children dies before you, that child’s descendants receive nothing unless you specifically provide for them; the surviving children split the estate among themselves.3Legal Information Institute. Per Capita
- Per capita at each generation. Living members at each generation take equal shares. Any shares belonging to deceased members at that level are pooled and divided equally among all descendants at the next generation, so grandchildren inherit equally regardless of which branch they come from.
The practical difference shows up when a predeceased child’s share reaches the grandchildren. Suppose you have three children, two of whom have died. Under per stirpes, each deceased child’s grandchildren split only their own parent’s one-third. Under per capita at each generation, the two deceased children’s shares are combined into one pool and divided equally among all surviving grandchildren from both branches, so every grandchild inherits the same amount.
Under pure per capita, if even one of your children is still alive, the surviving grandchildren of any deceased child get nothing at all. That result catches many people off guard, which is why per stirpes is the more common choice when the goal is to protect descendants.
There is also a variation called modified per stirpes, which starts the division at the first generation that has at least one living member rather than always starting at the children’s level.4Legal Information Institute. Modified Per Stirpes If all your children are dead but three grandchildren survive, the estate splits into three equal parts at the grandchild level, producing more equal treatment when the entire first generation is gone.
Per Stirpes on Retirement Accounts and Life Insurance
Many people first run into “per stirpes” not in a will but on a beneficiary form for a 401(k), IRA, or life insurance policy. The concept works the same way. If you name your children as beneficiaries per stirpes and one child dies before you, that child’s share passes to their descendants instead of being redivided among your surviving children.
How you select it depends on the institution. Some forms include a checkbox. Others make per stirpes the default when you name multiple beneficiaries. If no option appears, you can write “per stirpes” on the form after your beneficiaries’ names. Read the fine print, because the default handling of a deceased beneficiary’s share varies between institutions.
One critical detail: beneficiary designations on retirement accounts and life insurance policies override your will. If your will says “to my children, per stirpes” but your IRA beneficiary form names only one child with no per stirpes designation, the IRA goes to that one child regardless of what the will says. Keeping beneficiary forms consistent with your will is one of the most overlooked steps in estate planning, and a mismatch can redirect hundreds of thousands of dollars away from where you intended.
Not every program accepts per stirpes designations. The federal employees’ life insurance program, for example, does not allow per stirpes on its beneficiary forms.5U.S. Office of Personnel Management. What Is a Per Stirpes Designation A workaround is to name the beneficiary’s estate as the contingent recipient and then handle per stirpes distribution in your will.
Who Actually Counts as a Descendant
Per stirpes follows bloodlines and legal parent-child relationships. Three categories of people are commonly affected in ways that surprise families.
Adopted Children
Legally adopted children are treated identically to biological children for per stirpes purposes. If your son adopted a child, that adopted grandchild stands in line to inherit just as a biological grandchild would. The Uniform Probate Code, which many states have adopted in some form, explicitly includes adopted individuals in class gifts and terms of relationship used in estate documents.
Stepchildren
Stepchildren who have not been legally adopted are not considered lineal descendants. If your daughter married someone with a child from a prior relationship and never adopted that child, the stepchild receives nothing under a per stirpes distribution, even if they were raised as part of the family for decades. This is one of the most common sources of unintended disinheritance. If you want stepchildren included, you need to name them specifically in your will or trust.
Spouses of Deceased Children
The surviving husband or wife of your deceased child receives nothing through per stirpes. The share bypasses the in-law and passes directly to the deceased child’s descendants.1Legal Information Institute. Pure Per Stirpes If your son died before you leaving a wife and two children, only the two children inherit his share. His widow gets nothing from your estate through per stirpes unless you name her separately.
Using Per Stirpes in Your Own Plan
The phrase “to my descendants, per stirpes” in a will or trust creates a self-adjusting distribution. It automatically accounts for births and deaths that happen after you sign the document, so you don’t need to draft a new will every time a grandchild is born. That flexibility is why estate planning attorneys default to per stirpes language for most families. It typically appears in the residuary clause of a will, which covers everything left after specific bequests and debts are paid.
A few things worth getting right:
- Match your beneficiary forms to your will. Review every retirement account, life insurance policy, and payable-on-death bank account to confirm the per stirpes designation lines up with your overall plan.
- Decide whether unequal grandchild inheritance would bother you. If it would, ask your attorney about per capita at each generation as an alternative.
- Name stepchildren and in-laws explicitly. Per stirpes will never reach them on its own. If you want them included, they need their own line in the document.
- Revisit after major family changes. Per stirpes adjusts automatically for births and deaths, but events like adoption, divorce, or remarriage can create gaps that the language alone won’t cover.