Second Job or Side Hustle: How It Affects Your Tax Withholding
Picking up a second job or a side hustle is great for your income — but it can quietly create a tax withholding gap that surprises people at filing time. Here's why, and what to do about it. Why multiple jobs create a withholding problem Each employer calculates your federal withholding as if that job were your only source of income, using the standard deduction and tax brackets as though nothing else exists. When you have two jobs, both employers apply that same assumption independently — which means your combined income isn't withheld at the correct combined rate. The result is usually under-withholding , since neither employer accounts for the other's wages pushing you into a higher bracket. Worked example: two jobs, no adjustment Single filer with a $50,000 primary job and a $15,000 side job, no W-4 adjustments, no state tax. If each job withheld separately, as if it were the only income: Primary job ($50,000): withholds based on $50,000 minus standard ded...