To calculate Nevaeh's qualified business income $($QBI$)$ deduction, we need to follow these steps:

Calculate Nevaeh's QBI:

Nevaeh's QBI is equal to her net profit from her business since she did not have any other adjustments $($like employee wages or depreciation$).$ Therefore:

QBI$=$Net$$Profit$=170,000\backslash$text$\{$QBI$\}=\backslash$text$\{$Net Profit$\}=170,000$QBI$=$Net$$Profit$=170,000$

Determine the QBI Deduction:

The QBI deduction is generally $20\%$ of the QBI, but it can be limited based on taxable income thresholds. Since Nevaeh's joint taxable income is $$324,750,$ we need to check if it exceeds the threshold for the QBI deduction limit$.$

For the $2022$ tax year, the QBI deduction is subject to certain thresholds:

For married couples filing jointly, the threshold is $$329,800.$ If taxable income exceeds this threshold, certain limitations apply.

Since Nevaeh's taxable income is $$324,750,$ it is below the threshold, and thus, she is eligible for the full QBI deduction of $20\%$ on her QBI.

QBI$$Deduction$=20\%$QBI$=20\%170,000=34,000\backslash$text$\{$QBI Deduction$\}=20\backslash \%\backslash$times $\backslash$text$\{$QBI$\}=20\backslash \%\backslash$times $170,000=34,000$QBI$$Deduction$=20\%$QBI$=20\%170,000=34,000$

Conclusion

Nevaeh's qualified business income $($QBI$)$ deduction is:

Answer: $4.$ $$34,000.$