South Dakota Will Requirements: How to Make a Legally Valid Will

South Dakota law does not require you to hire an attorney to make a will. Under SDCL 29A-2-501, any adult of sound mind can draft their own legally binding will — but the execution requirements are specific, and getting them wrong can prevent probate or require additional proof. Here's exactly what the law requires.

The Basic Requirements

A valid will in South Dakota must meet all of these criteria under SDCL 29A-2-502:

1. Written document: The will must be in writing. South Dakota also permits remote witnessing of a non-holographic will under SDCL 18-8-2, but an ordinary electronic-signature workflow should not be assumed to satisfy all statutory execution requirements.

2. Signed by the testator: You must sign the document yourself, or direct someone else to sign in your presence and at your direction if you are physically unable.

3. Two witnesses: At least two individuals must witness either your signing of the will or your acknowledgment of your signature. Both witnesses must sign the document in your presence.

That's it for the core requirements. No attorney signature. No notarization (though a notary plays a role in the self-proving affidavit — more on that below). No filing with any court or government office during your lifetime.

The Holographic Will Option

South Dakota recognizes holographic (handwritten) wills under SDCL 29A-2-502(a). If the signature and all material provisions of the document are in your own handwriting, the will is valid without any witnesses.

This sounds convenient, but it carries real risk. Holographic wills are more frequently contested because there are no witnesses to confirm your mental state or intent at the time of writing. And "material provisions" means every substantive instruction — not just your signature, but the entire distribution plan, executor nomination, and guardian designations must be handwritten. A partially typed, partially handwritten document does not qualify as holographic unless its signature and material portions are in the testator's handwriting.

If you go the holographic route, date the document clearly. South Dakota law does not explicitly require a date on holographic wills, but an undated will creates ambiguity if you have multiple versions — and ambiguity means litigation.

Making Your Will Self-Proving

A self-proving affidavit under SDCL 29A-2-504 is the single most valuable addition to any South Dakota will. Without it, the court must locate your witnesses during probate to verify the will's authenticity. If a witness has moved, become incapacitated, or died, this creates delays and potential challenges.

The self-proving process works like this:

1. After signing the will with your two witnesses present, all three of you sign a separate affidavit
2. A notary public notarizes this affidavit, confirming the identities and signatures
3. The affidavit is attached to the will

With a self-proving affidavit in place, the court accepts the will without needing to track down witnesses — the notarized affidavit substitutes for live testimony.

Critical distinction: The notary does not make the will valid. The two witnesses make the will valid. The notary only makes the will self-proving, which simplifies the probate process later.

Common Mistakes That Invalidate a Will

Using a notary instead of witnesses. Many people believe a notarized signature alone makes a will binding. For a non-holographic will, a notarized signature alone does not satisfy SDCL 29A-2-502(b); two attesting witnesses are required.

Writing changes directly on a typed will. A handwritten change that does not follow the ordinary execution rules may require clear-and-convincing proof under SDCL 29A-2-503 that the testator intended it as an alteration. Use a formally executed codicil with the same witness requirements as the original will, or a completely new will, instead of relying on an informal change.

Signing electronically. South Dakota permits remote witnessing under SDCL 18-8-2, but the statutory electronic-presence and witness requirements still apply; do not assume a generic DocuSign workflow is sufficient.

Forgetting to update after major life events. If you marry after executing your will and the will does not provide for your new spouse, South Dakota's "omitted spouse" rule under SDCL 29A-2-301 generally gives your spouse an intestate share of your estate, subject to statutory exceptions such as a will made in contemplation of the marriage or a will stating that it remains effective despite a later marriage. The will isn't invalidated, but large portions of your estate may be redirected from your intended beneficiaries to your new spouse by operation of law.

Do You Need a Lawyer?

South Dakota law explicitly allows self-drafted wills. For straightforward estates — a home, bank accounts, retirement savings, personal property, and clear family structures — a well-executed will with a self-proving affidavit handles everything the probate court needs.

The situations where an attorney becomes important are specific: blended families with children from prior relationships, substantial business or agricultural interests, real property in multiple states, or special needs beneficiaries who receive government benefits.

The South Dakota Basic Estate Planning Kit provides the state-specific framework, execution instructions, and self-proving affidavit template to create a legally compliant will — covering the exact requirements under SDCL 29A-2-502 and 29A-2-504.

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