How is the small business deduction calculated for 2019? Multiple Choice 19% the lesser of active business income, taxable income, or the $500,000 annual limit. 19% the greater of active business income, taxable income, or the annual limit. 9% the greater of active business income, taxable income, or the annual limit. 9% the lesser of active business income, taxable income, or the $500,000 annual limit.