Calculate taxes on part-time earnings, side hustles, and second jobs. Understand how additional income affects your overall tax liability.
This tool is for educational and informational purposes only and does not constitute accounting, tax, or legal advice. Consult a qualified professional for personalized advice. Tax year: 2026.
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Part-Time Income Tax Breakdown
Total Income
$0
Total Tax on Combined Income
$0
Tax Attributed to Part-Time
$0
Net Part-Time Income
$0
Marginal Tax Rate0%
Effective Tax Rate (Combined)0%
Federal Income Tax$0
State Income Tax$0
Social Security$0
Medicare$0
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Income and Tax Comparison
Understanding Part-Time Income Taxes
Part-time income is taxed the same way as full-time income. However, because it's additional income, it may push you into a higher tax bracket, meaning your marginal tax rate could be higher than your effective tax rate.
Marginal vs. Effective Tax Rate
Your marginal tax rate is the rate at which your last dollar of income is taxed. Your effective tax rate is the average rate you pay on all your income. Part-time income is typically taxed at your marginal rate.
Withholding for Second Jobs
When you have multiple jobs, each employer withholds taxes independently. This can result in under-withholding because each job may calculate withholding as if it's your only source of income.
Side Hustle Considerations
Income from side hustles (Uber, freelance, gig work) is considered self-employment income and is subject to self-employment tax (15.3%) in addition to income tax.
Example Cases
Example 1: Full-Time + Part-Time W-2 Job
Primary: $60,000, Part-Time: $15,000, Combined: $75,000, Federal Tax: ~$9,500, State Tax (CA): ~$4,200, SS + Medicare: ~$5,700, Total Tax: ~$19,400
Example 2: Full-Time + Gig Work
Primary: $50,000, Gig Income: $10,000, Self-Employment Tax: $1,530, Federal Income Tax: ~$7,800, State Tax (TX): $0, Total Tax: ~$9,330
Calculation Methodology
Data Source:IRS Publication 15, IRS Publication 533
Last Updated:July 2026
Federal income tax is calculated using 2026 IRS tax brackets on combined income. Social Security tax is 6.2% on income up to $168,600. Medicare tax is 1.45% on all income. State tax rates vary by state.
Yes, all earned income is subject to federal income tax, Social Security, and Medicare taxes, regardless of whether it's full-time or part-time.
Each employer withholds taxes independently. You may need to adjust your W-4 allowances or make estimated tax payments to avoid underpayment penalties.
Gig work is generally considered self-employment income, not employee income. You'll receive a 1099-NEC instead of a W-2, and you're responsible for paying self-employment tax.
If you're an employee (W-2), you can't deduct unreimbursed employee expenses. If you're self-employed (1099), you can deduct ordinary and necessary business expenses.