Wisconsin: Petition to Probate a Will Requirements

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).