What is the Wisconsin statute of limitations in filing a small claims action?

It depends on the action. SOLs are based on what you are suing about, not where you are suing.

What is the Wisconsin Statute of Limitations in Small Claims Court for collecting an unpaid loan made between 2 private individuals?

Please don't start a new thread with a follow-up, just add a reply to the thread. I've merged the two threads for you.

Both written contracts and Open accounts carry a 6 year SOL.

Wisconsin Statute of Limitations (http://www.acollectionagency.com/statuteoflimitations/wisconsin.php)