Self-Proving Affidavit for Wills Requirements in South Dakota

At a glance

Requirements one by one

Availability and governing law

South Dakota's two forms are in SDCL § 29A-2-504. Subsection (a) combines execution, attestation, and self-proof. Subsection (b) lets an already attested will be made self-proved later. Section 29A-3-406 states the contested-case proof rules for wills with and without self-proof.

Who signs or swears

The testator and both witnesses are sworn and sign. The testator declares willing personal execution or willing direction of another signer. Each witness declares that the testator signed willingly and that the witness signed in the testator's presence and hearing. The officer then certifies the testator's subscription, oath, and acknowledgment and the witnesses' subscriptions and oaths.

The later form repeats the same three affiants. No personal representative or other replacement signer appears in the statute.

When it may be made

Subsection (b) allows self-proof “at any time after its execution.” The statute sets no numerical deadline. But all three affiants remain necessary, so the later route depends on the continued availability of the testator and both witnesses.

Officer, oath, and seal

The officer must be authorized to administer oaths under the law of the state where the execution or later acknowledgment occurs. Both forms require the officer's certificate, signature, official capacity, and official seal. The operative text says “under official seal,” and each form prints a seal line.

Required recitals and form

The forms need only be followed substantially. The testator recites willing and free execution or directed signing, age eighteen or older, sound mind, and freedom from constraint or undue influence. The witnesses swear that the testator signed willingly and that they signed “in the presence and hearing of the testator.”

The self-proof form does not add mutual witness presence. That is distinct from any separate choice a drafter makes for the underlying will ceremony.

Attachment to the will

The later officer certificate must be “attached or annexed to the will.” Section 29A-3-406 likewise requires filing the will with the acknowledgment and affidavits annexed or attached to obtain the self-proof presumptions.

Section 29A-2-504(c) adds a signature-spillover rule: a signature on an attached self-proving affidavit counts as a signature on the will when necessary to prove due execution. Other execution requirements still apply.

Electronic, remote, and out-of-state rules

Section 29A-2-504 does not create a separate electronic-will, remote-affidavit, or foreign-self-proof route. It does allow the officer's authority to come from the law of the state where the execution or later acknowledgment occurs, so an out-of-state ceremony can use an officer authorized there while still following the South Dakota form.

Probate effect and exceptions

Section 29A-3-406(b) divides the evidentiary effect. Compliance with signature requirements is conclusively presumed. Other execution requirements are presumed but remain subject to rebuttal, without testimony from a witness after the will and attached acknowledgment and affidavits are filed.

Proof of fraud or forgery affecting the acknowledgment or affidavit defeats those presumptions. The affidavit is not a conclusive ruling on capacity or undue influence.

If there is no affidavit

In a contested case where execution evidence is needed, § 29A-3-406(a) ordinarily requires testimony from at least one attesting witness who is in South Dakota, competent, and able to testify. The same subsection allows due execution of an attested or unattested will to be proved by other evidence.

That alternative matters in a state with harmless-error and holographic-will rules, but the proof question remains separate from whether a particular document meets those validity routes.

What trips people up

• The official seal is mandatory. Both statutory forms require it.
• The affidavit needs three affiant signatures. An officer-only signature block does not match the statute.
• Only signature compliance is conclusive. Other execution facts remain open to rebuttal.
• Later self-proof still needs the testator and both witnesses. “At any time” is not a post-death replacement process.

Common questions

Can the affidavit be added later?

Yes. Section 29A-2-504(b) permits it at any time after execution, using the later form with all three affiants and an authorized officer under official seal.

Can an affidavit signature repair a missing will signature?

Potentially. Section 29A-2-504(c) lets an attached affidavit signature count as a will signature when necessary to prove due execution. It does not excuse other execution requirements.

Does a self-proved will avoid every execution challenge?

No. Signature compliance is conclusive, but § 29A-3-406(b) makes other execution requirements only rebuttably presumed and preserves the fraud-or-forgery exception.

Statutes and sources

• S.D. Codified Laws § 29A-2-504 — both self-proof routes, forms, signer set, official seal, attachment, and signature-spillover rule. https://sdlegislature.gov/api/Statutes/29A-2-504.html (accessed 2026-08-01)
• S.D. Codified Laws § 29A-3-406 — split presumptions, fraud/forgery exception, witness testimony, and other proof. https://sdlegislature.gov/api/Statutes/29A-3-406.html (accessed 2026-08-01)