I usually charge when I get this specific, but here goes.
So I just want to make sure I understand the consensus here.
This is not something you do or not do based on consensus. If we all agree but we are all wrong, then you will lose in court. Read the Wisconsin Statutes, Title XL, Chapter 409 SECURED TRANSACTIONS:
1. In Subsection Section 409.102 it defines the debtor as the
"person having an interest, other than a security interest or other lien, in the collateral, whether or not the person is an obligor". This includes, in mpliska's example, the husband with his 50% undivided interest and the wife with her 50% undivided interest. [Section 409.102(1)(gs)(1)]
2. For a security interest to attach (e.g., the requirement to obtain a lien) the secured party (that's the lender) must make certain that the
"debtor (husband and wife in the referenced example)
has authenticated (signed)
a security agreement that provides a description of the collateral". That is why you have the borrowing husband and the non-borrowing wife sign the security agreement so you will have a security interest in 100% of the collateral. [Section 409.203(2)(c)(1.)]
3. In order for a filed financing statement to be effective the debtor (husband and wife) must authorize such filing. Section 409.509 is titled:
"PERSONS ENTITLED TO FILE A RECORD." In subsection (1) it states that a
"person may file an initial financing statement, amendment that adds collateral covered by a financing statement, or amendment that adds a debtor to a financing statement only if: -
(a) The debtor authorizes the filing in an authenticated record". Note, the most common way we have someone authenticate is to have them sign.
Therefore, if you want to file on both the husband and the wife you must have both of them sign something that will authorize the filing.
Sub (1)(a) continues by stating
"or pursuant to sub. (2) or (3)". The law then gives another way to obtain the authenticated record that authorizes the filing. The referenced sub (2) states:
"By authenticating or becoming bound as debtor by a security agreement, a debtor or new debtor authorizes the filing of an initial financing statement, and an amendment" covering the collateral described in the security agreement.
Therefore, by having both the husband and wife sign the security agreement it did two thing:
1. It gave you a security interest in each parties 50% undivided interest, and
2. I authorized your filing in both the name of the husband and the wife.
No spousal consent needed. But if you like the redundancy of having two thumbs on one hand, go ahead.