“Deferred marital property” means any property that satisfies all of the following:
(1) Is not classified by ch. 766.
(1m) Is not classified as individual property or marital property under a valid marital property agreement, unless the marital property agreement provides otherwise.
(2) Was acquired while the spouses were married.
(3) Would have been classified as marital property under ch. 766 if the property had been acquired when ch. 766 applied.