A seller pulls up their eBay 1099-K in January, compares it to their own sales log, and finds a number that's a few thousand dollars higher than what they actually sold. The instinct is to assume eBay owes them an explanation, or that the IRS now thinks they made more money than they did. Neither is quite right. Box 1a is a specific, narrow thing — gross payment volume — and it was never designed to equal taxable income. The gap is real, it's explainable, and it's different on eBay than it is on Shopify.
Box 1a doesn't subtract anything you'd expect it to
Form 1099-K reports the gross amount of payments a processor settled to you, and "gross" is doing real work in that sentence. eBay's own seller help pages are explicit that the figure reflects total payments received, with no adjustment for credits, discounts, fees, refunds, or any other reduction. That means three things a seller's own books would naturally subtract are all still sitting in Box 1a:
- eBay and Discogs selling fees — [the 13.6% final value fee and
- per-order fee](/blog/ebay-fee-calculation-2026), [Discogs' 9% selling
- fee](/blog/discogs-selling-fee-math-2026) — never come out of the gross
- figure. They're a Schedule C expense you claim separately, not a
- reduction the form makes for you.
- Refunds to buyers — a sale that didn't actually stick, dollar-wise,
- is still in the total eBay says it processed for you that year.
- Shipping labels you bought through the platform — those are a cost of
- doing business, deducted on your return, not something the 1099-K
- nets out before reporting.
None of that is platform-specific. It's true of eBay, Shopify Payments, and (as far as public documentation goes) Discogs alike: the form answers "how much did this processor move for you," not "how much did you make."
What counts as "gross" is where eBay and Shopify actually diverge
Here's the part that doesn't get explained consistently: whether sales tax and buyer-paid shipping are in that gross figure to begin with depends on who's legally responsible for the tax, and that's not the same company on every platform.
On eBay: buyer-paid shipping is included in Box 1a — eBay's help content and its own seller-support answers are consistent that shipping and handling the buyer paid you counts as part of the gross payment, the same as the item price. Sales tax is the exception that actually gets carved out, but only the slice eBay itself is responsible for. In essentially every state today, eBay is the legally designated marketplace facilitator for sales tax — it calculates, collects, and remits that tax directly to the state, and the seller never touches it. eBay's own 1099-K guidance says that facilitator-collected tax is excluded from the gross amount specifically because it was never the seller's money to report as income in the first place. The rare exception is a seller who still collects their own sales tax outside eBay's facilitator system — that slice, if it exists, does land in Box 1a, because nothing but eBay's own facilitator flow gets the carve-out.
On Shopify: there's no equivalent carve-out, and the reason is structural, not an oversight. Shopify isn't a marketplace facilitator for your store the way eBay is for listings on eBay.com — a Shopify store is your storefront, and when it collects sales tax through Shopify's tax settings, it's collecting it on your behalf as the merchant, not on Shopify's own behalf as a third-party facilitator remitting under its own registration. Shopify Payments is just the processor moving the money; it has no "this tax was never the seller's to report" basis for excluding it. So sales tax collected through Shopify Payments checkout is generally still inside the gross figure on a Shopify-issued 1099-K, stacked right on top of the item price and shipping.
On Discogs: this is the one place to be careful rather than assume. Discogs Payments (the Stripe-backed option) and the legacy PayPal payout path both issue their own 1099-Ks once a seller crosses the threshold on that processor, but neither Discogs' public help content nor Stripe's spells out a sales-tax carve-out as explicitly as eBay does. Don't assume Discogs mirrors eBay's exclusion just because both are "marketplaces" in the everyday sense — check your own Discogs sales report against whatever Box 1a shows up with, rather than guessing which model applies.
A worked example
Say an eBay seller's own records for the year show: $24,000 in item sales, $1,850 in buyer-paid shipping, $620 refunded back to buyers on returns, and $3,400 in eBay final value and per-order fees. eBay, as the marketplace facilitator, separately collected and remitted $1,550 in sales tax on these sales — tax the seller never saw hit their own funds.
Box 1a on the 1099-K: $24,000 + $1,850 = $25,850. The $1,550 in facilitator-collected sales tax is excluded, exactly as eBay's guidance describes. But the $620 in refunds and the $3,400 in fees are not subtracted — gross means gross, refunds and fees included in what was originally processed.
Actual Schedule C gross receipts, built from the seller's own log: $24,000 + $1,850 − $620 = $25,230 (the $3,400 in fees gets claimed as a separate expense line, not netted against gross receipts). That's $620 lower than Box 1a, purely because of refunds the form never subtracted — on top of whatever gap the sales-tax treatment adds or doesn't, depending on the platform.
Run the same seller's numbers through Shopify Payments instead, with the same $1,550 in sales tax actually collected through Shopify's checkout, and Box 1a would include that $1,550 rather than excluding it — a materially different gross figure off the same underlying sales, purely because of who's on the hook to remit the tax.
What to actually do
- Stop trying to make Box 1a equal your taxable income. It was never
- built to. Schedule C gross receipts
- come from your own order-level records — sale price plus shipping you
- collected, minus actual refunds — not from the 1099-K total.
- Reconcile the gap by category, not by guessing. On eBay, start by
- removing facilitator-collected sales tax from the difference; what's left
- after that is almost always refunds and fees that the form never
- subtracted to begin with.
- Don't assume Shopify's 1099-K behaves like eBay's. If your store
- collects sales tax through Shopify Payments checkout, expect it inside
- the gross figure, not excluded from it — Shopify isn't acting as your
- tax remitter the way eBay is.
- **Verify your own Discogs numbers rather than assuming either model
- applies.** Treat whichever processor — Discogs Payments or PayPal —
- shows up on the form as the one whose own documentation governs it.
- **A 1099-K that's higher than your sales log isn't a sign anything is
- wrong.** It's a sign the form is doing exactly what it was built to do:
- report gross payments moved, not profit earned.
PalmFlow pulls the order-level numbers this reconciliation actually needs — sale price, shipping collected, refunds, fees, and cost basis — for every order it imports from eBay, Shopify, or Discogs, so the Schedule C side of this math doesn't depend on waiting for a 1099-K to show up or guessing at what's inside someone else's gross figure. Free plan, 50 active items, no card required.
Disclaimer: this is general information, not tax advice. 1099-K reporting rules, marketplace-facilitator tax treatment, and each platform's own documentation are subject to change and can vary by state — confirm your own numbers against eBay, Shopify, and Discogs directly, and talk to a CPA before relying on this for a filing decision.