How to Track Reseller Profit Across eBay, Poshmark, Mercari, and Depop (2026 Guide)
"Most resellers don't actually know how much money they're making. They know their revenue... but the gap between ‘I sold it for $45’ and ‘I profited $22’ is filled with fees, shipping costs, supplies, gas, returns, and a dozen other expenses that silently erode margins." — Underpriced.app
That gap is the entire reason profit tracking exists. This guide covers exactly what to track, which numbers matter, and how to see your real P&L across eBay, Poshmark, Mercari, and Depop in 2026 — without maintaining a spreadsheet full of stale fee formulas.
Why Revenue Is the Wrong Number
Every platform dashboard shows you gross sales. That number feels good — it's big. But it's not your business. Your business is what you kept.
A $500 sales month can really equal just $180 in profit after accounting for platform fees, actual shipping costs, packaging, sourcing expenses, and hidden costs. That's not an edge case — that's typical for resellers who aren't tracking the gap.
Revenue is vanity. Profit is sanity. The goal of a P&L tracker is to show you profit — the number you actually kept — not the number you moved.
The Five Numbers That Determine Real Profit
For every item you sell, you need five inputs to get to true profit:
- Item cost (cost basis) — what you paid to acquire it, including sourcing costs like gas or estate sale entry fees.
- Sale price — what the buyer paid for the item (not including shipping, in most cases).
- Platform fee — varies by platform and category (see below).
- Shipping label cost — what you actually paid for postage. Not what the buyer paid for shipping — those are often different.
- Packaging — poly mailers, boxes, tape, tissue paper. It's small per item, but it adds up across 100 sales.
True profit = Sale price − Platform fee − Shipping label − Packaging − Item cost.
Most sellers skip steps 3 and 4 (using estimates instead of actuals) and ignore step 5 entirely. The result: they overestimate profit by 15–30% on typical items.
Platform Fee Reference for 2026
Fee rates as of June 2026, verified against each platform's public seller policies. These are the rates that apply to most sellers — use Cleared's fee calculator to run any specific scenario instantly.
| Platform | Seller fee (2026) | On a $50 sale |
|---|---|---|
| eBay | ~13.25% FVF on item + shipping, plus $0.40/order. Most categories. Varies by category. | ~$7.03 fee → ~$42.97 gross |
| Poshmark | 20% on sales ≥ $15; flat $2.95 under $15. No buyer fee (reversed Oct 2024). | $10.00 fee → $40.00 gross |
| Mercari | 10% flat on sale price. No separate processing fee as of Jan 2025. | $5.00 fee → $45.00 gross |
| Depop (US) | 0% selling fee (US/UK, since Jul 2024). Payment processing: 3.3% + $0.45. | ~$2.10 fee → ~$47.90 gross |
On the same $50 item: Depop nets ~$47.90, Mercari $45.00, eBay ~$42.97, Poshmark $40.00. That $7.90 difference compounds fast. Across 100 items a month, platform choice alone can mean $790 more or less in your pocket — before sourcing and shipping.
Why Spreadsheets Break Down
"Most spreadsheet systems fail because the reseller has to remember to log the buy, the list date, the sale, the fees, the shipping cost, and the refund if one happens." — Underpriced.app
There are three specific failure modes:
- Stale fee formulas. Platforms change fees constantly — Poshmark reversed its structure in Oct 2024, Mercari restructured its fee twice in two years, Depop dropped its 10% selling fee mid-2024. If your spreadsheet has hardcoded percentages, you may have been miscalculating for months without knowing it.
- Missing line items. "Most resellers who rely on spreadsheets underestimate their time investment and overestimate their profit because they forget to track fees, shipping supplies, and gas/sourcing time." — Underpriced.app
- Scale. A 5-item spreadsheet works. A 200-item spreadsheet with 4 platforms, partial refunds, and a return rate is a full-time job to maintain correctly.
A dedicated tracker with an editable fee engine — one you can update once when eBay changes a rate — solves all three. Every future calculation updates automatically.
What to Look for in a Reseller P&L Tracker
Five features that separate a useful tracker from a glorified spreadsheet:
- Per-item net profit. Not just totals — you need to know which categories and which platforms are actually profitable for you specifically.
- Editable fee schedules. When a platform changes rates (and they all do), you change one number and every past and future calculation updates.
- Multi-platform support. If you sell on three platforms, you need one view — not three tabs you reconcile manually.
- Actual shipping cost field. Not estimated, not buyer-paid. What you paid for the label.
- Tax-ready export. Your accountant needs cost basis, sale price, and net profit per item — not a screenshot of your eBay dashboard.
Cleared is built around exactly these five features — free to start, with an editable fee engine that covers eBay, Poshmark, Mercari, Depop, and more.
The Death Pile: Inventory You're Not Tracking
"Every reseller has a ‘death pile.’ Items that sit for months, eventually get donated, sold at a loss, or thrown away." — Underpriced.app
Your P&L tracker should surface aged inventory — items you bought 90+ days ago that haven't sold. The cost is tied up, and every month it sits is a month it's not earning. A visible "days to sell" column on every item makes the death pile visible instead of invisible.
A Simple Starting System
If you're starting from scratch, here's the minimum that actually works:
- Log every item the day you buy it: item name, cost paid, source (eBay, thrift store, estate sale).
- When it sells: add sale price, platform, shipping label cost, packaging estimate.
- Let the fee engine calculate net profit automatically — don't compute this by hand.
- Review monthly: which platforms, categories, and sources are most profitable?
That's it. The discipline is in the logging — the math should be handled for you. Try Cleared— it's free, and the calculator works instantly with no signup.
Frequently Asked Questions
Why don't platform payout dashboards show my real profit?
Platform dashboards show gross sales — your revenue before fees. To see real profit you need to subtract the platform's fee, the shipping label cost, your packaging, sourcing cost, and any returns. Cleared does this per item and per sale automatically.
What's the fastest way to track reseller profit across multiple platforms?
Log each item's cost basis (what you paid), the platform it sold on, and the sale price. A tool with built-in fee schedules for eBay, Poshmark, Mercari, and Depop will calculate the net automatically — so you don't maintain formulas manually when platforms change their rates.
Do I need a spreadsheet or a dedicated app to track reseller profit?
A spreadsheet works at low volume, but most reseller spreadsheets fail past 50 items because the fee formulas go stale and people forget to update them when platforms change rates. A dedicated tool with editable fee engines keeps the math current for you.
What costs do most resellers forget when tracking profit?
Platform fees and shipping labels are obvious. The ones people miss: packaging materials (poly mailers, tape, boxes), sourcing costs (gas to the thrift store, estate sale entry fees), and the time cost of returns and refunds. Each erodes your margin silently.
Is Cleared free to use?
Yes. The fee calculator and basic P&L tracker are fully free with no signup required to calculate. A Pro tier adds unlimited item tracking and CSV export for taxes.