No. If you add or subtract income, it's taxed at the top bracket, not the overall average.
https://www.nerdwallet.com/blog/taxes/federal-income-tax-brackets/
For example, a single taxpayer with gross income $80,000.
Standard deduction $10,200, taxable income $69,800.
The first $9,700 is taxed at 10%.
The next $30,000 is taxed at 12% (from $9701 to $39,475).
The rest is taxed at 22% (from $39,476 to $84,200).
The overall average is around 15% probably. But if you add or subtract (let's say) $10,000, that changes your taxable income from $59,800 to $79,800, all of which is within the 22% range.
