2026 tax year

Marketplace seller tax calculator

Selling a physical product is the one category where most of the money that arrives was never yours. Cost of goods and platform fees come off first, so gross receipts on a 1099-K bear almost no relation to taxable profit.

Materials, or what you paid to resell.

Enter your sales and costs.

Your 1099-K shows gross, not profit, reconcile it here. Full profit tool: seller profit calculator.

The deduction stack

Cost of goods sold is the largest line for this kind of work, which is what separates it from every other gig category. They are only deductible if you kept the record.

DeductionAmount
Cost of goods sold, 30% of sales$13,500
Platform fees, 29.50% of sales$13,275
Total deductions$26,775
Net profit, the taxable figure$18,225

On $45,000 of gross, 60% never reaches taxable profit. The gross and the cost figures illustrate the shape of the work, they are not a claim about what anyone earns, and every rate applied to them is from the verified 2026 dataset.

Nothing is withheld These platforms are not employers and take nothing out. What you owe is paid in four instalments across the year, see quarterly estimated payments.

Marketplace seller taxes by state

Your state's rate applies to that net profit. Each page works it through with that state's 2026 rules:

Platforms this covers

Other gig categories