Picture this: You die in Missouri. St. Louis, maybe — somewhere near the Arch, which is a fitting monument to things that go up and then… stop. Your family is processing the loss. They’re managing logistics. And then, out of absolutely nowhere, a person shows up claiming to be your child. A child you didn’t know about. Or maybe you vaguely suspected but never legally confirmed. Missouri law says: if it’s true, they get an equal share. Your estate — the house, the retirement account, everything — now has a new claimant. Your existing children are furious. Your spouse is shell-shocked. The lawyers are writing their children’s tuition checks.
Here’s what Missouri does with your estate when you die without a will — including the parts nobody warns you about.
Missouri’s Intestate Succession Law
Missouri intestacy is governed by Chapter 474 of the Missouri Revised Statutes. The formula is familiar — spouse first, then children, then parents — but Missouri has some specific wrinkles worth knowing.
If you have a surviving spouse and children:
- All children are also the spouse’s children? Spouse inherits the entire estate.
- Children from a prior relationship? Spouse inherits half the estate; the other half goes to all children equally (including any prior-relationship children).
If you have a surviving spouse but no children:
- Spouse inherits the entire estate.
If you have children but no surviving spouse:
- Children share equally.
No spouse, no children:
- Parents inherit (equally if both alive).
- No parents? Siblings split equally.
- No siblings? Descendants of siblings (nieces, nephews) share by representation.
- No nieces or nephews? The estate goes to grandparents, then their descendants, then more distant relatives.
- Truly no one? Estate escheats to Missouri.
Unmarried partners: Missouri does not recognize common-law marriage (it abolished the concept in 1921). An unmarried partner — regardless of cohabitation length or financial interdependence — inherits nothing under intestacy. A will is the only protection.
The unknown child scenario: This is where Missouri gets particularly interesting. If a child is born after a person dies intestate — or if a child’s parentage is established posthumously — that child has a claim on the estate. DNA testing, prior relationships, brief encounters decades ago — any of these can produce a claimant your estate wasn’t prepared for.
What Probate Looks Like in Missouri
Missouri probate runs through the Circuit Court in the county where you lived. Missouri has 45 circuit courts across 46 counties (Jackson County has two circuits) plus the City of St. Louis, which operates as an independent city with its own circuit.
Timeline: Missouri probate typically takes 6–12 months for straightforward estates. The mandatory creditor notification period is 6 months from the date of the first published notice — setting the minimum timeline. Complex estates, disputes among heirs, or challenges to parentage can push this to 18–24 months or more.
The process:
- Petition filed in Circuit Court
- Administrator appointed (no will = administrator, not executor)
- Letters of administration issued
- Inventory and appraisal of assets
- Creditors notified; 6-month claims period
- Debts and taxes paid
- Distribution per intestacy law
- Final settlement; estate closed
Cost: Missouri probate costs typically run 3–5% of the estate value in attorney fees and administrative costs. A $300,000 Missouri estate might see $9,000–$15,000 in fees. Court filing fees are modest; the real costs are time and professional hours.
Missouri’s small estate shortcut: Estates under $40,000 (net of liens) can use the “refusal of letters” procedure — a simplified affidavit that allows heirs to collect assets without full probate. No court appointment required. For many Missourians with modest estates, this is a meaningful escape hatch. For homeowners or those with retirement accounts, $40,000 is far too low a threshold.
Missouri-Specific Quirks
The pretermitted heir rule — Missouri’s hidden time bomb.
Missouri’s pretermitted heir statute (§474.240) is the provision that makes the unknown child scenario real. Here’s how it works:
If you have a child who is born after you make your will, that child is a “pretermitted heir” and is entitled to an intestate share — even if your will doesn’t mention them. The will doesn’t cut them out automatically. This applies even more directly in intestacy: any child established as yours, regardless of when or how parentage is determined, gets an equal share.
What this means in practice: if a person claims to be your child after you die, DNA testing can establish parentage posthumously. If confirmed, they get an equal share with your other children. Even if you had no idea they existed. Even if you would have wanted nothing to do with them. The law doesn’t care about your preferences — just biology and legal parentage.
No estate tax. No inheritance tax.
Missouri has neither a state estate tax nor an inheritance tax. Repealed. Done. Whatever your family inherits, Missouri doesn’t take a cut. This is genuinely good news and makes Missouri one of the more tax-friendly states for estate purposes.
The “refusal of letters” procedure for small estates. As noted above, Missouri’s $40,000 small estate affidavit is a real option for qualifying estates. The form is filed with the court (or sometimes directly with the asset holder), heirs are identified, and assets are distributed without full probate. It’s genuinely useful for the estates it covers.
Missouri’s spousal elective share. A surviving spouse can elect to take against the will — claiming a percentage of the estate regardless of what the will says. In intestacy, this is less relevant, but it reflects Missouri’s general protection of spousal rights.
Circuit court structure. Missouri’s 45 circuit courts serve the state, with the City of St. Louis operating independently. This matters because circuit courts vary in efficiency, local customs, and processing times. St. Louis County (suburban) and Kansas City (Jackson County) courts handle large volumes of estate matters. Rural circuit courts may have very different rhythms.
How to Avoid This Mess
Missouri’s combination of the pretermitted heir rule, a 6-month creditor period, and full probate for any estate over $40,000 makes dying without a will here an extended ordeal — and potentially a dramatic one if parentage is ever contested.
A will gives you control:
- Direct your assets to the people you want to have them
- Explicitly address any children (including any you know about from prior relationships)
- Protect an unmarried partner who’d otherwise inherit nothing
- Name guardians for minor children
- Specify your personal representative rather than letting the court appoint one
Killswitch makes a legally valid will for $69. One hour of a Missouri probate attorney’s time costs more than this. The peace of mind it buys is worth considerably more than that.
Write your will. Don’t let an unknown heir derail everything you built.
Go to killswitch.rip.
Frequently Asked Questions
Q: Can an unknown child claim a share of a Missouri estate?
Yes. If parentage is established (including posthumously through DNA testing), a child is entitled to an equal intestate share regardless of whether the deceased knew about them. The pretermitted heir rule applies; a will can address this explicitly, but intestacy cannot.
Q: Does Missouri have a small estate procedure to avoid probate?
Yes — estates under $40,000 (net of liens and encumbrances) can use Missouri’s “refusal of letters” procedure, collecting assets via affidavit without full probate. This threshold covers many modest estates but won’t help most homeowners.
Q: Does Missouri have a state estate tax or inheritance tax?
No. Missouri has neither. Your estate won’t owe Missouri any death taxes, making it one of the more tax-friendly states for inheritance purposes.
Q: What happens to an unmarried partner in Missouri without a will?
Nothing. Missouri abolished common-law marriage in 1921 and doesn’t recognize it. An unmarried partner inherits zero under intestacy, regardless of relationship length. A will is the only protection.
Q: How long does Missouri probate take?
The mandatory 6-month creditor notice period sets the minimum. Most simple estates close in 6–12 months. Disputes over parentage, real estate issues, or multiple heirs with disagreements extend this significantly — sometimes to 18–24 months.
