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.

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.

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.

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.

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.

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.

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.