Side Hustles — Taxes and Tracking Income

Getting paid outside a regular job has different rules

Mowing lawns. Babysitting. Selling art online. Flipping items on eBay. Tutoring. Driving for a gig app. These are all side hustles — and they all have tax implications that regular paycheck jobs handle automatically for you, but side hustle income does not.

When you work a regular job, your employer withholds taxes from every paycheck and sends them to the government. When you earn money on your own — as a freelancer, contractor, or independent earner — nobody does that for you. You are responsible for tracking the income, paying the taxes, and filing correctly. Ignoring this leads to unexpected tax bills and sometimes penalties.

When does side hustle income become taxable?

The IRS requires you to report all income from any source — including self-employment income — if you earn more than $400 from self-employment in a year, or more than $600 from a single client or platform (who is required to send you a 1099-NEC form).

Even if you earn less than these thresholds, the income is technically taxable. The $400 and $600 figures are reporting and withholding triggers, not exemptions from tax liability.

Babysitting and lawn mowing paid in cash? Still taxable. Selling handmade goods on Etsy? Taxable income (minus expenses). Getting paid for tutoring? Taxable. Many teens assume cash income is invisible — it is not, and the IRS has significantly increased scrutiny of cash-based and gig economy income.

Self-employment tax vs income tax

Regular employees pay 7.65% in FICA taxes (Social Security + Medicare) — and their employer pays a matching 7.65%. Self-employed people pay both halves: 15.3% self-employment tax on net earnings. This comes on top of regular income tax. It is why self-employed income feels like it disappears faster than a paycheck — you are paying both sides of FICA yourself.

The 1099-NEC form

If a client, app, or platform pays you $600 or more, they are required to send you a Form 1099-NEC (Nonemployee Compensation) by January 31st. This form reports to both you and the IRS that you were paid this amount.

If you receive a 1099-NEC, you must report that income on your tax return. There is no matching withholding — you owe income tax and self-employment tax on the net amount. This surprises many first-time gig workers who expect a tax situation as simple as their W-2 job.

Quarterly estimated taxes

When self-employment income is significant enough, the IRS expects you to pay taxes quarterly — in April, June, September, and January — rather than waiting until the annual April filing date. If you wait until April and have a large tax bill, you may also owe a penalty for underpayment throughout the year.

The general rule: if you expect to owe more than $1,000 in federal taxes on your self-employment income, you should be making quarterly estimated payments using IRS Form 1040-ES.

The big advantage: business deductions

This is where self-employed people get a significant tax benefit. Business expenses that are ordinary and necessary for your work can be deducted from your income before calculating tax. This is completely legal and the IRS explicitly supports it.

Examples:

Lawn care business: mower fuel, replacement blades, safety equipment, website costs
Tutoring: educational materials, a portion of your internet bill, apps used for sessions
Art sales: supplies, shipping materials, marketplace fees (Etsy charges, PayPal fees)
Photography: equipment, editing software, memory cards, travel to shoots

If your art side hustle earned $1,500 but you spent $400 on supplies and $100 on platform fees, you are taxed on $1,000 — not $1,500.

Track everything from day one

The IRS requires substantiation for business deductions. A shoebox of receipts works technically, but a spreadsheet or free app (Wave, Keeper, or simply Google Sheets) works better. For each expense: date, amount, vendor, and business purpose. Photograph receipts as you go — they fade. The two minutes spent tracking each expense can save real money on your tax bill.

Separate business and personal money

Even as a teenager with a small side hustle, keeping business income and expenses in a separate bank account (or at minimum a separate spreadsheet column) protects you in two ways:

It makes tax filing vastly simpler — you can see total income and expenses clearly
It protects you from the IRS treating personal spending as business expenses, which can trigger audits

Opening a free checking account just for side hustle income is easy and worth doing from the first dollar.

Platforms that report to the IRS

Since 2023, digital payment platforms (Venmo Business, PayPal, Cash App Business, Etsy, eBay, Amazon Seller) are required to send a 1099-K to users who receive more than $600 in business transactions in a year. If you sell goods or services and accept payment through these apps, assume the IRS will receive a report of your activity.

Real-world example

Sia is 17 and starts a tutoring side hustle. She earns $3,200 over the year — all Venmo transfers. She also spends $240 on study materials and $60 in Zoom fees for remote sessions. Come tax time, she reports $3,200 in income and deducts $300 in expenses, leaving $2,900 in taxable self-employment income. She owes self-employment tax of 15.3% on $2,900 = $444, plus income tax. Total tax bill: roughly $600. She did not make quarterly payments and owes a small penalty too. Next year, she sets aside 25% of every payment she receives and makes one quarterly estimated payment. No surprises.

You earn $850 in cash from mowing lawns this summer. Do you need to report this income on your taxes?

You run a photography side hustle and earned $2,000 this year. You spent $450 on equipment and $100 on editing software. How much is your taxable self-employment income?

What is self-employment tax and why is it higher than regular employee payroll taxes?

You receive a Form 1099-NEC showing $1,800 from a tutoring app. What does this mean for your taxes?

Treat your side hustle like a business from the start

The simplest system: open a separate bank account, deposit every side hustle payment there, track all expenses in a free spreadsheet, and set aside 25–30% of net income for taxes. Do this from your first dollar and tax season becomes straightforward rather than stressful. Side hustles are genuinely valuable — they build skills, create income, and can grow into real careers. The tax piece is manageable once you know the rules.

Self-employment income over $400 must be reported on your tax return. You pay 15.3% self-employment tax (both employee and employer FICA halves) on net profit. Business expenses (supplies, software, equipment) reduce your taxable income — track everything with receipts. Platforms like Venmo, PayPal, and Etsy now report income over $600 directly to the IRS. Set aside 25–30% of side hustle income for taxes from day one.