Self-Proving Affidavit for Wills Requirements in Iowa

At a glance

Requirements one by one

Availability and governing law

Iowa Code § 633.279(2) allows an attested will to be made self-proved. The same section now contains a permanent remote-signing overlay: original counterparts may be executed in different locations and aggregated, and statutory “presence” can be physical or electronic in real time.

Who signs or swears

The testator acknowledges and signs, and both attesting witnesses make affidavits and sign. Iowa's form also requires the witnesses to declare that they were at least 16 years old.

When it may be made

Self-proof may be completed at the will's execution or at any subsequent date. The later form still requires the testator's acknowledgment and both witnesses' affidavits; the statute does not create a post-death substitute signer.

Officer, oath and seal

The testator and witnesses act before a person authorized under Iowa law both to administer oaths and take acknowledgments. That person's certificate must be under seal.

Required recitals and form

The form need only be substantially followed, but Iowa specifies an unusually detailed factual set. The participants declare that they knew one another's identities, the testator exhibited and identified the instrument as the will, the signing occurred at the stated place and date, the testator and witnesses acted in the required presence and at the testator's request, and the witnesses were at least 16.

Attachment to the will

The authorized person's sealed certificate must be attached or annexed to the will. The statutory affidavit identifies the “attached or foregoing” instrument.

Electronic, remote and out-of-state rules

For all of § 633.279, presence includes a physical or electronic setting in which the witness and testator can see and hear each other's acts in real time. A remotely signed will may consist of original counterparts aggregated into the complete instrument. That is not the same as authorizing a will that exists only as an electronic record.

Section 633.283 may validate a written, subscribed will executed under the law of the place of execution or the testator's domicile, but does not state that a foreign self-proof clause automatically supplies Iowa probate proof.

Probate effect and exceptions

The affidavit constitutes the due-execution proof required for admission under § 633.293 and permits probate without witness testimony. Section 633.279 does not call the affidavit conclusive, prevent a contest, or excuse an execution defect that the affidavit does not truthfully establish.

If there is no affidavit

Section 633.295 permits oral or written testimony from one or more subscribing witnesses, and its written form may be sworn before or after the testator's death. If every subscribing witness is dead or otherwise unavailable, § 633.297 allows two credible disinterested witnesses to prove the relevant handwriting or permits other sufficient evidence of execution.

What trips people up

Remote signing does not mean a purely electronic will

The 2023 amendment authorizes real-time electronic presence and aggregation of original counterparts. The statutory text still describes original documents and counterparts, so a video ceremony does not by itself authorize a will that exists only as a digital file.

Iowa's affidavit asks for more than a generic capacity recital

The statutory form focuses on identities, exhibition of the will, its declaration and signing location/date, the requested mutual-presence ceremony, and witness age. A generic affidavit that only says the testator was competent misses much of the prescribed factual proof.

Common questions

Must an Iowa will witness be 18 to sign the affidavit?

No. The statutory form asks the witnesses to declare that they were 16 years of age or older, matching Iowa's witness-competency floor.

May ordinary written witness proof be sworn after the testator dies?

Yes. Section 633.295 expressly says its written subscribing-witness testimony form may be executed and sworn to before or after the decedent's death.

Statutes and sources

• Iowa Code § 633.279(2)–(5) — self-proof form and effect, later timing, remote counterparts, disaster-era validation, and physical/electronic presence: official Iowa Code 2026 Chapter 633 PDF (accessed 2026-08-01)
• Iowa Code § 633.293 — admission upon proof of due execution: official Iowa Code 2026 Chapter 633 PDF (accessed 2026-08-01)
• Iowa Code §§ 633.295 and 633.297 — subscribing-witness testimony and unavailable-witness alternatives: official Iowa Code 2026 Chapter 633 PDF (accessed 2026-08-01)
• Iowa Code § 633.283 — foreign execution validity: official Iowa Code 2026 Chapter 633 PDF (accessed 2026-08-01)