If a trustee does not maintain a separate account for a business or other activity conducted as a sole proprietorship, the net profits of the sole proprietorship in any fiscal or calendar year, as reasonably and equitably determined by the trustee, must be allocated to income while any net loss in that year must be charged to principal and must not be carried into any other fiscal or calendar year for purposes of calculating net income.
Minn. Stat. § 501C.1108
2015 c 5 art 11 s 8