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Side Hustle Taxes: What Happens When You Make Money Outside Your Day Job

By Pennie at FiscallyAI • Updated • 12 min read

The Basic Rule

All income is taxable. Whether you receive a 1099, get paid in cash, or barter for services, the IRS expects you to report it. There is no minimum threshold below which income becomes tax-free (the $600 1099 reporting threshold is about what the payer must report, not what you must report).

How Side Hustle Income Is Taxed

If You Earn Less Than $400 in Net Self-Employment Income

You do not owe self-employment tax, but you still owe income tax on the earnings.

For more on this topic, see our guide on Freelancer Tax Guide: Quarterly Payments, Deductions, and Common Mistakes.

If You Earn $400 or More in Net Self-Employment Income

You owe both income tax AND self-employment tax (15.3%). This is in addition to the taxes on your day job income.

For more on this topic, see our guide on Side Hustle Income Calculator: How Much Can You Actually Make?.

The Tax Bracket Surprise

Side hustle income stacks on top of your day job income. If your day job puts you in the 22% bracket, every dollar of side hustle income is taxed at 22% (federal) plus self-employment tax (15.3%) plus state tax. Your effective side hustle tax rate can easily reach 35-40%.

Platform-Specific Rules

Rideshare (Uber, Lyft, DoorDash)

You are an independent contractor. Track your mileage (the standard mileage deduction in 2026 is $0.70/mile). For many drivers, the mileage deduction significantly reduces taxable income.

Selling Online (Etsy, eBay, Poshmark)

If you are selling items at a profit, the profit is taxable income. If you are selling personal items at a loss (decluttering your closet), there is no tax. The cost basis of the item matters.

Freelancing (Upwork, Fiverr)

Standard self-employment rules apply. Deduct business expenses, pay quarterly estimated taxes if you expect to owe $1,000 or more.

The Action Plan

  1. Open a separate bank account for side hustle income.
  2. Immediately transfer 30% of every payment to a savings account earmarked for taxes.
  3. Track all business expenses.
  4. Pay quarterly estimated taxes if your side hustle is generating significant income.
  5. Consider a SEP-IRA or Solo 401(k) to shelter some side hustle income from taxes while building retirement savings.