Common Delaware Estate Planning Mistakes and How to Avoid Them

Estate planning mistakes don't announce themselves. They hide inside documents that look fine to the person who signed them, only surfacing months or years later when a family member tries to use them — and discovers they don't work.

Delaware's specific statutory requirements make certain mistakes more common here than in other states. Knowing what they are is half the battle.

Mistake 1: Relying on a Handwritten Will

This is the most devastating Delaware-specific mistake because the will looks perfectly reasonable. A person writes out their wishes in their own handwriting, signs it, maybe even dates it. In roughly half of U.S. states, this "holographic will" is legally valid.

In Delaware, it's worthless. Delaware does not recognize holographic wills under any circumstances. A valid will must be in writing (typed or printed), signed by the testator, and witnessed by two competent adults. A handwritten will that was valid in a state the person previously lived in may not be recognized after they move to Delaware.

Mistake 2: Using the Wrong Witnesses

Delaware applies different witness rules to different documents, and mixing them up invalidates the document:

Wills: Two competent adult witnesses required. Beneficiaries are not disqualified but are strongly discouraged.

Powers of Attorney: One adult witness required. The witness must not be related by blood, marriage, or adoption, and must not be a beneficiary. Violation invalidates the document.

Advance Directives: Two witnesses required. A five-point exclusion list bars relatives, beneficiaries, creditors, medical providers, and facility employees. If the person lives in a long-term care facility, at least one witness must be a state-designated Ombudsman.

Using a family member to witness a power of attorney — which feels natural and convenient — produces a document that every bank in Delaware will reject.

Mistake 3: Skipping the Agent's Certification on a Power of Attorney

Delaware's Durable Personal Powers of Attorney Act requires that the appointed agent sign a statutory "Agent's Certification" before exercising any authority. This is a separate document from the power of attorney itself.

Without it, the agent has been technically appointed but has no practical authority. Financial institutions will refuse to process transactions, and the family is stuck — either tracking down the agent to sign the certification (if the principal is still competent) or petitioning the court for guardianship (if they're not).

Mistake 4: Failing to Record a Transfer on Death Deed Before Death

Delaware's TOD deed law (effective December 2025) allows real estate to pass directly to a beneficiary outside of probate. But the deed must be signed, notarized, witnessed, and recorded with the county Recorder of Deeds before the owner dies.

An executed TOD deed sitting in a desk drawer — unrecorded — has no legal effect. The property goes through probate as if the deed never existed. There is no grace period, no retroactive recording, and no exception.

Mistake 5: Naming All Children as TOD Deed Beneficiaries Without a Survivorship Clause

When a TOD deed names multiple beneficiaries, Delaware law defaults them to tenants in common — not joint tenants. This means if one beneficiary dies before the property owner, that beneficiary's share passes to their own heirs (not to the surviving siblings).

A parent with three children who records a TOD deed naming all three as beneficiaries may intend for the home to be split equally among whoever survives. Instead, if one child dies first, that child's share goes to their spouse or children — introducing an in-law or grandchild as a co-owner of the family home.

Mistake 6: Not Updating Beneficiary Designations After Life Changes

Beneficiary designations on retirement accounts, life insurance, and bank accounts override everything — including your will. After a divorce, remarriage, birth, or death in the family, outdated designations can send assets to the wrong person.

This is especially dangerous with retirement accounts governed by federal ERISA law, where Delaware's automatic revocation statute (which nullifies will provisions favoring an ex-spouse) may not apply. If your ex-spouse is still named on your 401(k), they likely inherit it regardless of what your will says.

Mistake 7: Creating a Trust but Never Funding It

A revocable living trust avoids probate only for assets that have been retitled into the trust. A trust that exists on paper but holds no assets is just an expensive document. The family still goes through probate for every account, property, and vehicle left in the individual's name.

Proper funding means physically changing the ownership: re-deeding real estate, renaming bank accounts, updating investment account registrations, and aligning beneficiary designations. This is tedious, unglamorous work — and it's where most DIY trust creators stop short.

Mistake 8: Ignoring the 10-Day Will Filing Deadline

Under 12 Del. C. § 1301, anyone who possesses an original will must deliver it to the county Register of Wills within 10 days of learning of the testator's death. Keeping the will in a safe deposit box, a home safe, or a filing cabinet past this deadline triggers potential civil liability and contempt of court charges.

The fix is simple but often overlooked: tell your executor exactly where the original will is stored, and make sure they can physically access it within 10 days of your death.

The Delaware Basic Estate Planning Kit addresses each of these mistakes with step-by-step guidance, witness eligibility references, and county-specific filing checklists — so you catch the errors before they become irreversible.

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