SEP contribution limits are computed not from net profit but from net profit "adjusted" for the deduction for self-employment tax (2019 Form 1040 Schedule C, line 31; 2019 Form 1040, Schedule F, line 34; or 2019 Form 1065, Schedule K-1, box 14, code A). Barring limits, this is half the 15.3% FICA tax, levied on net earnings, which is 92.35% of net profit. Therefore, adjusted net profit (net profit minus deduction for self-employment tax) is 92.935225% of net profit, which is close to but slightly more than net earnings.