Wis. Stat. § 24.77

The common school fund income is constituted of the interest derived from the common school fund and from unpaid balances of purchase money on sales of common school lands; and all other revenues derived from the common school lands; but the common school fund income and interest and revenues derived from the common school fund and from common school lands do not include expenses deducted from gross receipts permitted under ss. 24.04 (2), 24.53 and 24.62 (1).