Question 5 of 35. To avoid a penalty for underpayment of estimated tax for 2021, a sole proprietor with an AGI below $150,000 (575,000 if MFS) should make estimated payments in the amount of the smaller of % of the tax shown on their 2020 return or % of the tax shown on their 2021 return. O 50%, 90% 90%: 50% 90%, 100% 100%, 90% Mart tar follow.com OOOO Question 6 of 35. Self-employed taxpayers are allowed to deduct one-half of their SE tax on their Schedule A (Form 1040) Schedulo 1 (Form 1040). Schedule C (Form 1040). Schedule SE (Form 1040). Mark for follow up