Missouri Estate Planning Mistakes That Cost Families

What Happened

A Kansas City-area estate planning law firm published a detailed breakdown of the most damaging mistakes families make when creating or neglecting estate plans. The piece, authored by attorney Kyle Krull of Harvest Law KC in Overland Park, identifies eight recurring patterns that transform estate plans into costly disasters for surviving family members. The article draws on a June 2026 Kiplinger analysis titled "Wills Gone Wild: How to Avoid Estate Planning Disasters" as a reference point.

The core argument is straightforward: estate planning failures rarely stem from one catastrophic error. Instead, they accumulate from small oversights — an unreviewed beneficiary form, a trustee chosen for loyalty rather than capability, documents stored where no one can find them. Each gap creates friction during an already emotionally difficult time, and in many cases, these gaps translate directly into court involvement, family conflict, and avoidable financial loss.

The article identifies six primary failure modes: never creating a plan at all, writing unclear or impractical instructions, failing to update beneficiary designations, choosing the wrong executor or trustee, leaving documents uncoordinated, and hiding important paperwork where family members cannot locate it. A seventh thread runs through all of these: waiting until a crisis forces the issue, at which point thoughtful planning becomes nearly impossible. The piece emphasizes that effective estate planning is not a one-time event but an ongoing process tied to life changes.

What It Means

For Missouri families, these mistakes carry specific legal and financial consequences that the state's own statutes make concrete. Consider the beneficiary designation problem first. Missouri law treats divorce as an automatic revocation of beneficiary designations on certain accounts, a protection that applies in Missouri — but this protection does not cover every asset type, and it does not help when someone simply forgets to update a form after remarriage or the birth of a child. When a beneficiary designation conflicts with a will, the designation controls. An outdated form on a life insurance policy or retirement account can redirect thousands of dollars away from the intended recipient, regardless of what the will says.

The executor and trustee selection problem has direct cost implications in Missouri. The state uses a statutory fee schedule for attorney compensation during probate, running from 5%RSMo § 473.153(3) (statutory minimum: 5% first $5K, 4% next $20K, 3% next $75K, 2.75% next $300K, 2.5% next $600K, 2% over $1M; where reasonable compensation exceeds the minimum the court shall allow additional compensation — extraordinary services not required). Per § 473.153(1) the base is personal property administered plus proceeds of court-ordered real property sales; unsold real property is excluded.Verified Jul 14, 2026View source on the first portion of the estate down to 2%RSMo § 473.153(3) (statutory minimum: 5% first $5K, 4% next $20K, 3% next $75K, 2.75% next $300K, 2.5% next $600K, 2% over $1M; where reasonable compensation exceeds the minimum the court shall allow additional compensation — extraordinary services not required). Per § 473.153(1) the base is personal property administered plus proceeds of court-ordered real property sales; unsold real property is excluded.Verified Jul 14, 2026View source on amounts above one million dollars. A poorly chosen personal representative who creates delays or disputes can extend what is already a 12 monthsRSMo § 473.023Verified Jul 14, 2026View source to 18 monthsRSMo § 473.023Verified Jul 14, 2026View source probate process, compounding both professional fees and family stress. Missouri probate carries a court filing fee of $115 - $565 (based on estate value)Mo. Sup. Ct. Op. R. 21.01(a)(12)-(13); RSMo §§ 488.012, 483.580Verified Jul 14, 2026View source, and executors typically must post a surety bond — estimated at roughly 0.5%RSMo §§ 473.157 (requirement), 473.160 (waiver by will)Verified Jul 14, 2026View source of the estate value — though the will can waive this requirement. These costs multiply when administration drags on. Families with estates below $40,000§ 473.097Verified Jul 14, 2026View source in net personal property value can use a Small Estate AffidavitRSMo § 473.023Verified Jul 14, 2026View source after a 30 days§ 473.097Verified Jul 14, 2026View source waiting period, but only if the estate plan — or lack of one — does not complicate asset transfers.

The coordination failure identified in the Harvest Law KC article connects directly to Missouri's intestate succession rules. When someone dies without a coordinated plan, or with a plan that contradicts itself, Missouri law fills the gaps automatically. A surviving spouse with children who are also the decedent's children receives the first $20,000 plus half of the remaining estate under Missouri's default rules — First $20,000 plus half of the remaining estateMo. Rev. Stat. § 474.010Verified Jul 15, 2026View source. When children are from a prior relationship, the surviving spouse receives only Half of the estate (no base amount when children are not of spouse)Mo. Rev. Stat. § 474.010Verified Jul 15, 2026View source. These outcomes may not match what the deceased intended, particularly in blended families. Missouri also requires that a beneficiary survive the decedent by 120 hoursMo. Rev. Stat. § 474.010Verified Jul 15, 2026View source to inherit under intestate succession — a detail that matters when multiple family members are involved in the same accident or illness. None of these defaults account for family dynamics, debt situations, or the specific wishes of the person who died. A coordinated estate plan, reviewed regularly, replaces these defaults with deliberate choices. For Missouri families interested in understanding how probate works and why avoiding it matters, the SimplyTrust guide on avoiding probate with a trust and the overview of what probate actually involves provide useful context.

Context from SimplyTrust

The mistakes catalogued in the Harvest Law KC article — unreviewed documents, mismatched beneficiary forms, hidden paperwork — all point toward the same underlying need: a complete, coordinated estate plan that reflects current circumstances. Missouri residents creating wills need 2RSMo § 474.320Verified Jul 15, 2026View source witnesses and must meet a minimum age of 18 yearsRSMo § 474.320Verified Jul 15, 2026View source. Missouri does not require notarization for a will to be recognized, though a self-proving affidavit — which does require notarization — speeds up the probate process by eliminating the need to locate witnesses later. Missouri does not recognize handwritten wills, meaning an informal, handwritten document carries no legal weight under state law. For Missouri residents thinking through the full picture of their estate plan, the SimplyTrust glossary of estate planning terms clarifies the vocabulary involved, and the article on 20 common estate planning mistakes expands on the patterns described here. Missouri also recognizes transfer-on-death deeds for real property, giving homeowners an additional tool for keeping real estate out of probate without a full trust. Missouri imposes no state estate or inheritance tax, which simplifies planning for most families — though the federal estate tax exemption of $15,000,00026 USC 2001(c), 2010; P.L. 119-21 §70106Verified Jul 13, 2026View source remains relevant for larger estates. Understanding the full range of available tools, from beneficiary designations to trusts to transfer-on-death deeds, is the starting point for avoiding the disasters described in this article. The SimplyTrust resource on seven reasons to bypass probate outlines why proactive planning consistently outperforms reactive administration.

Source: Common Estate Planning Disasters and How to Avoid Them - Harvest Law KC