Setting up a seller account feels simple. Load a product. Pick a price. Wait for orders. Then a referral fee appears, a payout hold lands, and tax paperwork shows up months later. That gap between listing and getting paid is where first-time sellers get surprised.

Amazon, eBay, Etsy, and Walmart all look like storefronts. Each one controls your cash in a different way. Turns out, the money you can withdraw matters as much as traffic.

Start With Payouts, Not Traffic

Marketplace selling is not one decision. You choose a platform for your product, accept its fee stack, wait through its payout timeline, and keep proof if a buyer disputes the order. A marketplace with millions of shoppers can still be a bad first choice if it holds new-seller funds or charges fees that eat a thin margin.

Use the table as a starting point. The details decide whether the platform fits your cash flow.

Amazon: The Referral Rate Is One Line

Amazon doesn't reduce to one referral percentage. Third-party fee models published for 2026 often use a 15% default referral fee with a $0.30 minimum in many categories, and lower rates such as 8% for some electronics-style categories. See Amazon fee modeling.

Thing is, 15% is only one line. Fulfillment fees, storage, ads, returns, and inbound shipping can push total Amazon-side costs much higher. One fee breakdown estimates all Amazon-side fees commonly take 30% to 45% of the selling price before product and ad costs. The same source's $30 example totals $20.03 for Amazon fees, product, inbound, ads, and tools/ops. Read the full fee breakdown.

Check the exact category and fulfillment method before you buy inventory. A generic percentage from a forum won't protect your margin.

eBay: When Your Money Becomes Available

eBay uses transaction holds, payment dispute holds, and payout holds. For items sent with an eBay shipping label, funds typically become available 24 hours after delivery confirmation. Once a seller qualifies for faster payouts, eBay says funds are usually available within about 2 days of the buyer's payment. Local pickup confirmation can come from scanning the buyer's pickup code. See eBay's transaction holds help page.

Disputes run on a different clock. eBay may ask sellers for evidence within 5 calendar days after a dispute notification. For orders totaling $750 or more, seller protections can require proof that signature confirmation was purchased. For in-store pickup, the seller may need evidence such as scanning the buyer's QR code or entering the six-digit pickup code. eBay explains those requirements in its payment dispute seller protections.

Don't spend proceeds the moment a sale shows up. Wait for Available funds.

Etsy Reserves: What Changes the Hold

Etsy can place a payment reserve on a shop. It holds a percentage of funds for a period. For most sellers, the reserve is removed within 90 days. A reserve is not a suspension and not an accusation, according to Etsy's payment account reserve help page.

Tracking helps. If Etsy can confirm the order is in transit, reserved funds move to your current balance. Etsy also says support cannot give the specific reason a reserve was placed. Asking again usually won't free the money. Ship on time, add tracking, and keep cases low. Those are the signals the system can see.

Walmart: Approval Is the First Filter

Walmart Marketplace is smaller than Amazon. That doesn't make it easy to join. The application asks about your selling history, platforms, product categories, sales volume, SKU count, and shipping setup. Third-party guides say you should be able to ship within one to two days and use GS1-upgraded UPC codes. See this Walmart seller application guide for the reported steps and requirements.

WFS, Walmart's fulfillment program, changes the cost side. A third-party overview says WFS rates average about 15% less than comparable fulfillment services and that Walmart.com has roughly 200,000 active sellers against about 120 million monthly visitors. Treat those figures as context, not a profit promise. Fewer sellers can mean cheaper ad clicks. Approval and fulfillment rules still control whether you get in. The marketplace overview covers that side.

Tax Reporting: The 1099-K Is Not Your Profit

The 1099-K threshold has moved around in recent years. Seller tax sources currently describe the federal threshold for payment apps and online marketplaces as over $20,000 in gross payments and more than 200 transactions. That threshold is not a tax exemption. If you sell below it, you still owe tax on taxable profit. This is explained in a 1099-K threshold explainer and a seller tax guide.

To be honest, the 1099-K is not a profit statement. It reports gross payment volume. It can include platform fees, shipping, sales tax collected, refunds, and returns. You report the full amount on Schedule C Line 1, then deduct refunds, cost of goods sold, fees, and expenses; Line 31 is your net profit, which is the number that actually matters. A $700 payout can be a taxable gain, a non-taxable personal loss, or business revenue depending on what you sold and why.

State sales tax and nexus rules are separate from federal income tax reporting. Don't mix the two.

Compare the Math Before You List

Do the math per unit, not per platform slogan.

1. Estimate product cost, shipping to you, and packaging.
2. Add the platform's referral or final value fee for your exact category.
3. Add fulfillment, storage, and ad costs if you'll use them.
4. Check the payout hold or reserve policy for new sellers.
5. Set aside money for taxes based on your rate and state rules.
6. Keep tracking, receipts, and basis records for every item.

If the unit economics only work when you ignore holds, ads, or taxes, they don't work yet.

Questions Sellers Ask First

Do I get a 1099-K if I sell only a few used items? Not usually. The federal threshold is over $20,000 and more than 200 transactions. You still report taxable gain if you made one.

Why does Etsy hold my funds if I shipped with tracking? A reserve can stay for other risk factors. Tracking can release the reserved portion tied to an in-transit order. It doesn't automatically remove the whole reserve.

How long does eBay hold money for a new seller? eBay doesn't promise one timeline for every account. For items sent with an eBay shipping label, funds typically become available 24 hours after delivery confirmation. Sellers who qualify for faster payouts usually receive funds within about 2 days of the buyer's payment.

Is Walmart easier than Amazon because it has fewer sellers? Fewer sellers doesn't mean easy approval. Walmart asks for selling history, shipping capability, and compliant UPC codes.

What should I do before opening a seller account? Build a one-page cost sheet. Include fees, shipping, ads, returns, hold periods, and tax set-aside. If profit is still positive, list a small test batch.

Don't choose a platform because someone online called it passive income. Choose the one whose payout rules and fee structure you can live with. Then test one small batch before you scale.