What a Side Gig Really Pays After Fees and Taxes

A side gig that brings in $500 in sales did not actually put $500 in your pocket. Platform fees come out first, and self-employment tax comes out after that, on top of your regular income tax. Knowing both numbers ahead of time keeps you from mistaking revenue for take-home pay.

1. Start with platform fees, since they come out first

Different platforms structure their fees differently, but marketplace selling platforms are a useful concrete example. Etsy's published fee policy lists a $0.20 listing fee, a 6.5% transaction fee on the order total (item price plus shipping), and a payment processing fee of 3% plus $0.25 per transaction for US sellers.

On a $50 sale with no separate shipping charge:

• Listing fee: $0.20
• Transaction fee: $50 × 0.065 = $3.25
• Payment processing: $50 × 0.03 + $0.25 = $1.75
• Total fees: $5.20

Net from the sale after platform fees: $50 - $5.20 = $44.80. That is before subtracting your cost of goods, and well before taxes.

2. Then self-employment tax, on your net profit

If your side gig is run as a sole proprietor (the default structure for most individuals who have not formally incorporated), you generally owe self-employment tax once your net earnings from self-employment reach $400 or more in a year, according to the IRS. The self-employment tax rate is 15.3%, made up of 12.4% for Social Security and 2.9% for Medicare, but it is not calculated on 100% of your net profit. The IRS requires you to apply the tax to 92.35% of your net earnings first.

Take a side gig with $20,000 in net profit for the year (after deducting costs of goods, platform fees, and legitimate business expenses):

Taxable base: $20,000 × 0.9235 = $18,470 Self-employment tax: $18,470 × 0.153 = $2,825.91

On $20,000 in net profit, self-employment tax alone takes $2,825.91, roughly 14.1% of that net profit figure, before any federal or state income tax is applied on top. The IRS does let you deduct half of this self-employment tax ($1,412.96 in this example) when calculating your adjusted gross income, which softens the income tax impact slightly, but the self-employment tax itself is still owed in full.

3. A smaller example, since many side gigs are modest

Not every side gig clears $20,000. On a more typical $8,000 in net profit for the year:

Taxable base: $8,000 × 0.9235 = $7,388 Self-employment tax: $7,388 × 0.153 = $1,130.36

Even at this smaller scale, self-employment tax takes just over $1,130, which is worth setting aside throughout the year rather than discovering at tax time.

4. Putting both pieces together

Starting from $500 in sales on a platform like Etsy:

1. Platform fees (at the rates above, scaled to $500): roughly $52 in combined listing, transaction, and processing fees
2. Remaining after fees: about $448
3. Subtract your actual cost of goods (materials, supplies) to get net profit; assume $200 in costs for this example, leaving $248 in net profit
4. Self-employment tax on $248 of net profit: $248 × 0.9235 × 0.153 ≈ $35

After fees, cost of goods, and self-employment tax, roughly $213 of the original $500 in sales remains before any income tax is applied. That is a meaningfully different number than the $500 figure that might appear in a sales dashboard.

5. Why this matters for pricing and planning

Side gig sellers who price products based only on covering materials cost, without accounting for platform fees and the eventual self-employment tax bill, often discover at tax season that a "profitable" year actually left less cash on hand than expected. Setting aside a portion of every sale (some side-income guides suggest 25% to 30% of net profit as a rough reserve for federal self-employment and income tax combined, though your actual rate depends on your total income and filing status) avoids a surprise bill later.

6. Key takeaways

• Platform fees come out of your sale price immediately; on a $50 Etsy sale, combined listing, transaction, and payment processing fees total about $5.20.
• Self-employment tax applies once net self-employment earnings reach $400 or more in a year, at a combined rate of 15.3%, calculated on 92.35% of net earnings, not the full amount.
• On $20,000 in net profit, self-employment tax alone is $2,825.91; on $8,000, it is $1,130.36.
• Half of your self-employment tax is deductible when calculating adjusted gross income, which reduces (but does not eliminate) its overall impact.
• Setting aside a portion of every sale for taxes, separate from the money already lost to platform fees, prevents an unpleasant surprise at filing time.

The gap between "sales" and "take-home" is real and calculable. Running your own numbers through fees, cost of goods, and self-employment tax before setting prices or spending the money gives a far more honest picture than the sales total alone.