The E-Commerce Seller's 1099 Tax Handbook

Your 1099-K says $80,000. You did not earn $80,000.

It reports every dollar a processor moved for you - before marketplace commission, before payment fees, before refunds, before shipping labels, and before what the goods cost you. Report it wrong and you pay tax on money you never kept.

What you'll learn

• How to reconcile a 1099-K to your own books — line by line, so the gross number on the form and the profit on your return tell the same story
• Why inventory is not an expense when you buy it — the single costliest mistake sellers make, and the cost-of-goods calculation that fixes it
• The simpler inventory method most small sellers qualify for — and why you may not need the accounting system you think you do
• Every deduction sellers miss — marketplace fees, processing fees, packaging, software, home office, mileage, returns
• Sales tax, nexus and marketplace facilitators — where your obligation starts, and what a platform collecting on your behalf does and does not settle
• Quarterly taxes without the panic — four dates, the safe harbour, and what to do if you miss one
• Filing step by step — Schedule C including Part III, Schedule SE and Form 1040 without jargon

New for 2026

• The 1099-K threshold went the other way from the headlines — the 2025 law restored $20,000 and 200 transactions, so fewer sellers get a form, not more. Payment-card sales still have no minimum
• 1099-NEC threshold now $2,000 — up from $600, which changes what you must issue to your own contractors
• Backup withholding is 24% — when a W-9 is missing or wrong
• Social Security wage base — $184,500
• The 20% qualified business income deduction — worked through on a seller's numbers

Who this guide is for

• Amazon, Etsy, eBay, Shopify, Walmart and TikTok Shop sellers
• Anyone selling across more than one channel
• Handmade and print-on-demand sellers, and dropshippers
• Sellers who deducted a year of stock purchases and suspect that was wrong

Why this one is different

It shows the arithmetic. Every rate, threshold and deadline is a number you can scan and use, collected again in a quick-reference appendix, with templates and a year-end checklist so you are not rebuilding records in April.

Use it as an educational companion throughout the year, then bring your organized records and specific questions to a qualified tax professional when your situation calls for personalized advice.

Read on this subject

Free articles on the questions this guide covers, each one checked against IRS sources.

• The stock you bought in December is not a December deduction Inventory is deducted when it sells, not when you pay for it.
• Your card processor has no 1099-K threshold at all $20,000 and 200 transactions covers payment apps. Card processors have no threshold whatsoever.