Petition to Probate a Will Requirements in Wisconsin

At a glance

Requirements one by one

Governing law and proceeding type

Wisconsin separates formal and informal administration. Formal administration uses the chapter 856 petition, court hearing, proof, and appointment sequence. Section 865.01 defines informal administration as a circuit-court proceeding without continuous court supervision, with administrative action by the probate registrar rather than the court.

Informal administration is unavailable if the will prohibits it. When the will does not name an accepting representative or the other statutory conditions are not met, § 865.02 generally requires all interested persons to request or consent in writing to both informal administration and the same proposed representative.

Court and venue

Section 856.01 places a Wisconsin domiciliary's estate in the circuit court of the domicile county. For a decedent without a Wisconsin domicile, any county containing decedent property may act, and the court that first exercises jurisdiction has exclusive jurisdiction. The verified filing must show that jurisdiction.

Who may petition

Under § 856.07, a person named in the will to act as personal representative or any interested person may petition. If neither does so within thirty days after death, the statute opens the formal route to the decedent's former guardian, a creditor, someone whose cause of action or appeal requires a representative, or someone interested in property that is or may be part of the estate.

Absent a formal-administration demand or another listed proceeding, § 865.04 allows any interested person to apply for informal administration.

Petition contents

The formal petition combines § 879.01's general verified-petition requirements with § 856.09. It shows jurisdiction and the petitioner's interest; reasonably ascertainable interested persons, addresses, disabilities, and guardians; the decedent's name, age, domicile, address, and death; administrable property; will status and date; named representative and testamentary trustee; and the requested appointee's address and eligibility facts.

An informal application under § 865.06 is also verified and carries those facts forward. It adds other Wisconsin or out-of-state proceedings and, for a testate estate, the location or attachment of the original or authenticated foreign copy, plus the applicant's proper-execution, validity, diligent-inquiry, and no-revocation statements.

Original will, copy, and lodging

Section 856.05 requires the original will to be filed in the proper court or delivered to the named representative for filing. For informal probate, § 865.06 requires the application to state that the original is already with the court or accompanies the application. If the will was probated elsewhere, an authenticated copy accompanies the application.

A missing will does not use that ordinary original-or-authenticated-copy route. Section 856.17 authorizes proof of its execution and validity and requires the petition to state the will's provisions.

Filing or production deadline

The two thirty-day clocks in § 856.05 have different triggers. A custodian other than the named representative has thirty days after learning of death to file the will or deliver it to the nominee. A named representative has thirty days after knowing both that the will names that person and that the testator died to file, unless the will is already deposited with the court.

The statutes state no general numerical deadline for the probate petition. Section 856.07's thirty days instead expands who may petition; it does not close the proceeding to the initial eligible filers.

Proof and self-proving route

For an uncontested formal probate, § 856.15 allows one subscribing witness to make the required sworn statement in open court. An attestation clause showing statutory execution or a substantially compliant § 853.04 affidavit permits the court to admit the will without testimony or other evidence. If no competent subscribing witness lives in Wisconsin or can be found there after reasonable diligence, other testimony may prove competency, execution, and the relevant handwriting.

Section 856.16 gives a statutory self-proving affidavit its conclusive execution-compliance presumption, rebuttable presumptions for other execution requirements, and signature-curing effect unless affidavit fraud or forgery is proved. For informal probate, § 865.07 requires the original will to carry the qualifying attestation clause or affidavit.

Notice, hearing, and objections

Formal administration requires a hearing under § 856.11 to prove the will, determine heirship, and appoint a representative. Interested persons receive a will copy, except that a specific or monetary beneficiary instead may receive the nature and amount of the gift. General notice rules require first-class mail at least twenty days before the proceeding or personal service at least ten days before the hearing; the first mailed notice is accompanied by class 3 publication.

Informal administration still requires notice under § 865.05, but the statute does not impose a universal hearing. Notice may be waived under the cross-referenced rule. Within ten days after appointment in a testate informal estate, § 865.08(5) requires the representative to give each interested person a will copy and the interested-person list.

Executor, bond, and letters

Section 856.21 gives the named representative first priority, followed by an interested person or nominee in the court's discretion, then a court-selected person. Section 856.23 disqualifies an unauthorized corporation, a nonresident who has not filed a resident-agent appointment, and a person found unsuitable for good cause; nonresidence may itself support nonappointment or removal.

Under § 856.25, letters do not issue until bond is given or the court orders appointment without bond. Bond and amount are otherwise solely discretionary, a will's no-bond request is not binding, and specified authorized banks are exempt. For informal administration, § 865.08 requires acceptance and any bond before letters, which issue after appointment and qualification. If the decedent was a nonresident, informal appointment waits until thirty days after death unless the applicant is the domiciliary representative.

What trips people up

The thirty-day will-filing rule is not a universal thirty-day probate-petition deadline. One clock governs the custodian, another governs the person named as representative, and a separate thirty-day passage expands the class of people who may petition.

Informal administration does not mean no notice. It replaces continuous court supervision with registrar action, but the initiation notice and the ten-day post-appointment will-and-list delivery still apply unless the governing notice can be waived.

Common questions

Does Wisconsin always require a formal probate hearing?

No. Formal administration uses the § 856.11 hearing. Qualifying informal administration proceeds before the probate registrar and has notice requirements, but §§ 865.05 through 865.08 do not make a hearing universal.

Can a creditor petition immediately after death?

Not under the expanded § 856.07(2) category. That route opens after thirty days if neither a named representative nor an interested person has petitioned.

Does a no-bond clause bind the Wisconsin court?

No. Section 856.25 expressly says the will's direction or request is not binding, and the court retains discretion over whether and how much bond to require.

Statutes and sources

• Wis. Stat. §§ 856.01, 856.05, 856.07, 856.09, 856.11, and 856.13 — venue, delivery, petitioner, contents, hearing, and admission routes (accessed August 4, 2026).
• Wis. Stat. §§ 856.15 through 856.17 and 856.21 through 856.25 — proof, self-proof, missing wills, priority, disqualification, bond, and letters (accessed August 4, 2026).
• Wis. Stat. §§ 865.01, 865.02, and 865.04 through 865.08 — informal administration, application, notice, determinations, appointment, and letters (accessed August 4, 2026).
• Wis. Stat. §§ 879.01, 879.03, and 879.05 — verified petition, notice recipients, service timing, and publication (accessed August 4, 2026).