An NOL is the excess of business losses over business income reduced by the excess, if any, of nonbusiness income over nonbusiness deductions. By filling out worksheet 1 in pub 536 that will give you your NOL if any. Attach a computation of your NOL using Form 1045, Schedule A, and, if it applies, your NOL carryover using Form 1045, Schedule B. Don't attach a written statement as no one will read it anyway