Wisconsin: Assumed-Name (DBA) Registration Requirements

Requirements one by one

The required county filing is narrow

Wisconsin has no general rule requiring every business using a DBA to register.
Section 134.17(1) instead targets a specific combination: a mercantile or
commission business uses a name that looks corporate, intends to obtain credit,
and the name discloses none of the real names involved. That filer must record a
verified ownership statement with the register of deeds in the county of its
principal place of business before engaging in or advertising the business.

Under § 134.18, adopting and advertising a corporate-form name that discloses
no connected person's name is legal evidence that the name was adopted or used
to obtain credit.

Most DBA users have an optional state registration

Chapter 132 defines a registrable mark to include a trade name
(§ 132.001(2)). Section 132.01(1) says an eligible user "may file" the mark
with DFI, and the agency's current filing page states directly that registration
is not required. The optional filing costs $15 and requires a separate filing
for each name or design (§ 132.01(3)).

The optional registration lasts 10 years. Renewal is available during the six
months before expiration for another 10-year period, also for $15
(§ 132.01(6)(b)). Voluntary cancellation is free under § 132.01(7)(b).

Registration is evidence, not the sole source of name rights

A DFI registration certificate is prima facie evidence of adoption and the
facts required for registration (§ 132.031). But § 132.25 preserves rights
acquired under common law. The filing record can therefore support a claim; it
does not erase an earlier user's rights or conclusively establish ownership.

What trips people up

• Section 134.17 is not a general optional county DBA system. It is a
  mandatory rule only when all of its corporate-looking-name, business-type,
  credit-intent, and owner-name conditions are met.
• The two routes have different terms. The county statement has no stated
  expiration, though verified amendments and discontinuances may be recorded.
  The optional DFI registration lasts 10 years.
• Ordinary trade-name registration has no newspaper step. Section 132.04
  does require publication, but only for ownership marks on specified cans,
  bottles, barrels, and other containers—not the § 132.01 DBA/name filing.
• The county rule has a direct penalty. A covered person who fails to record
  first faces up to a $1,000 fine, county jail for up to one year, or both
  (§ 134.17(1)). There is no penalty for declining the optional DFI filing.

Common questions

What if the covered county statement later changes? Section 134.17(2)
allows a verified amendment signed by all concerned parties to be recorded in
the same register of deeds office. A verified discontinuance signed by all
interested parties may also be recorded under subsection (3).

Is DFI's foreign-corporation fictitious-name form a normal DBA form? No.
Corp. 21B says it is only a supporting document when a foreign corporation's
real corporate name is unavailable for its Wisconsin certificate of authority.
It expressly says it is not for a Wisconsin entity or an ordinary DBA.

Statutes and sources

• Wis. Stat. §§ 134.17–.18 — narrow required county statement, amendments,
  discontinuance, fee cross-reference, penalty, and evidence of credit intent.
  Official text (accessed 2026-07-25).
• Wis. Stat. ch. 132, especially §§ 132.001, 132.01, 132.031, and 132.25 —
  optional mark/trade-name registration, $15 fee, 10-year term, renewal,
  evidentiary effect, and preserved common-law rights. Official chapter (accessed 2026-07-25).
• Wisconsin DFI Trademark File Online — agency confirmation that DBA/name
  registration is optional and costs $15. Official instructions (accessed 2026-07-25).
• Milwaukee County Register of Deeds — current $30 general document
  recording fee. Official county page (accessed 2026-07-25).