Wis. Stat. § 846.13
The mortgagor, the mortgagor's heirs, personal representatives or assigns may redeem the mortgaged premises at any time before the sale by paying to the clerk of the court in which the judgment was rendered, or to the plaintiff, or any assignee thereof, the amount of such judgment, interest thereon and costs, and any costs subsequent to such judgment, and any taxes paid by the plaintiff subsequent to the judgment upon the mortgaged premises, with interest thereon from the date of payment, at the same rate. On payment to such clerk or on filing the receipt of the plaintiff or the plaintiff's assigns for such payment in the office of said clerk the clerk shall thereupon discharge such judgment, and a certificate of such discharge, duly recorded in the office of the register of deeds, shall discharge such mortgage of record to the extent of the sum so paid.
Wis. Stat. § 846.13
A bankruptcy court reduction of a mortgage lien does not affect the payment required for redemption. Hobl v. Lord, 162 Wis. 2d 226, 470 N.W.2d 265 (1991). A circuit court has no authority to accept a plan of redemption that fails to provide for immediate, full payment. A mortgagor may only redeem the mortgaged property for the full amount of the foreclosure judgment, plus interest, costs, and taxes. M&I Marshall & Ilsley v. Kazim Investment, Inc. 2004 WI App 13, 269 Wis. 2d 479, 678 N.W.2d 479, 03-0404. Sale under this section means confirmation of the sale. That under M&I a circuit court has no authority to accept a plan of redemption that fails to provide for immediate full payment does not contradict that fact. State Bank v. Sechen, 2005 WI App 253, 288 Wis. 2d 168, 707 N.W.2d 576, 05-0482. Someone must notify the court when a redeeming payment is made, but this section does not require that it be the mortgagor. By the plain language of the first sentence, redemption occurs upon payment. The second sentence does not mention redemption, does not give any suggestion that the receipt must be filed within any particular time limit, and does not state that filing the receipt is a necessary prerequisite for redemption to occur or that redemption is void if a receipt is not filed. Osterberg v. Lincoln State Bank, 2006 WI App 237, 297 Wis. 2d 30, 725 N.W.2d 634, 06-0068. This section does not apply to a junior lienholder. Section 846.15 specifically addresses junior lienholders. In practice, the "right to redeem" may be used loosely to include both a mortgagor's right to redeem under s. 846.13 and a junior lienholder's right under s. 846.15 to pay the judgment and become subrogated to the plaintiff's rights in the judgment. However, when a mortgagor pays the plaintiff the amount of the judgment, the judgment is discharged and the mortgagor retains title. When a junior lienholder pays the plaintiff the amount of the judgment, the junior lienholder neither retains title, since it never had it, nor acquires title; rather, the junior lienholder acquires the rights the plaintiff has as a result of the judgment. JP Morgan Chase Bank, NA v. Green, 2008 WI App 78, 311 Wis. 2d 715, 753 N.W.2d 536, 07-1753. A circuit court could reasonably exercise its discretion to adjourn a scheduled confirmation hearing to allow a mortgagor additional time to make a promised redemption payment. However, it would not be an misuse of discretion for a court to decline such a request and proceed to address the only issue relevant to a confirmation hearing whether the sale at public auction should be confirmed. A mortgagor who has the ability and desire to redeem must make payment before the commencement of a properly scheduled confirmation hearing in order to avoid the risk of losing the opportunity to redeem as permitted under this section. Harbor Credit Union v. Samp, 2011 WI App 40, 332 Wis. 2d 214, 796 N.W.2d 813, 10-0974.