Married taxpayers who file a joint return and have taxable income of less than $$340,101$ may be eligible to deduct $20\%$ of their qualified business income. However, their deduction could be subject to a limitation based on:

Ordinary taxable income $($taxable income before any OBQ deduction, minus net capital gains and qualifed dividends.$)$

Phase$-$in rules.

Phaseout rules.

The amount of their taxable income from Form $1040,$ line $15.$