Whether you're driving for a rideshare app in Mesa, selling crafts online, or doing freelance consulting on the weekends, having a side gig in addition to your primary W-2 job drastically changes how you file your taxes. You are now officially a business owner in the eyes of the IRS.
Enter Schedule C
Even if you haven't formally registered an LLC, the income from your side gig must be reported on a Schedule C (Profit or Loss From Business) attached to your standard Form 1040. You will likely receive a 1099-NEC or 1099-K from the platforms you work for, but you must report the income even if it falls below the threshold to generate a forced form.
The Double-Edged Sword of Business Expenses
The good news: Unlike W-2 employees (who lost the ability to write off unreimbursed employee expenses in 2018), side gig workers can write off "ordinary and necessary" business expenses to lower their taxable income.
- Home Office: If you use a dedicated space exclusively for your side gig, you can deduct a percentage of your rent/mortgage and utilities.
- Mileage: Miles driven specifically for the side business are deductible (keep a rigorous log!).
- Supplies & Software: Subscriptions, tools, and inventory used for the gig are write-offs.
The Self-Employment Tax Trap
The bad news: The net profit from your side gig is subject to self-employment tax (15.3% for Social Security and Medicare) in addition to your standard income bracket tax. If your W-2 job doesn't withhold enough to cover the taxes generated by your side gig, you could face a massive, unexpected tax bill and underpayment penalties in April.
The Solution
As your tax professional, I can help you correctly categorize your side-gig expenses to lower that taxable profit, and we can calculate exactly how much you need to adjust your W-4 withholding at your primary "day job" so that your side hustle remains profitable without destroying your spring tax refund.