Compare your profit across every marketplace, after platform fees AND estimated tax. The profit calculator competitors don't have.
The problem: Every reseller profit calculator shows you what you made after platform fees. None show what you keep after taxes. A reseller who "made" $20,000 in profit on eBay last year actually kept ~$14,000 after self-employment tax and income tax, but no tool told them that. Platforms only have to send a federal Form 1099-K once you pass $20,000 and 200 transactions (restored by the One Big Beautiful Bill Act), but the profit is taxable from the first dollar whether or not a form arrives, and some states set lower reporting thresholds.
This tool gives you: true profit after platform fees AND taxes, across eBay, Poshmark, Mercari, FB Marketplace, Depop, Etsy, and Amazon, side by side. See which platform actually pays you the most per item. Batch mode handles up to 20 items with sortable results and aggregate tax estimates.
| # | Item Name | Buy $ | Sell $ | Platform | Ship $ |
|---|
See your full platform comparison
The side-by-side fee comparison across every platform and your minimum sell prices to clear a profit, unlocked here and emailed to you.
| Platform | Fee Structure |
|---|---|
| eBay | 13.6% final value fee + $0.40 per order ($0.30 on orders of $10 or less); athletic sneakers $150+ are 8% |
| Poshmark | Flat $2.95 under $15, 20% over $15 |
| Mercari | 10% selling fee |
| FB Marketplace | 10% on shipped orders (minimum $0.80); no fee on local pickup |
| Depop | No selling fee for US sellers since July 2024; payment processing applies (see Depop's current fees) |
| Etsy | 6.5% transaction + $0.20 listing + 3% + $0.25 payment processing |
| Amazon (Individual) | $0.99 per item + ~15% referral fee |
Disclaimer: This calculator provides estimates for educational purposes only. It is not tax, legal, or financial advice. Platform fee calculations use simplified models and may not reflect all seller-level discounts, promotions, or category-specific rates. Tax estimates use marginal rate approximations. Actual liability may differ. Always consult a qualified tax professional for advice specific to your situation.
This tool calculates your true profit on each sale by subtracting three layers of cost: platform fees, cost of goods sold (COGS) plus shipping, and estimated income tax on the resulting profit. Platform fees are modeled individually for seven marketplaces using their 2026 fee schedules: eBay charges 13.6% plus $0.40 per order in most categories, Poshmark takes a flat $2.95 on items under $15 or 20% over $15, Mercari charges 10%, and so on for FB Marketplace (10% on shipped orders), Depop (no US selling fee; payment processing only), Etsy (6.5% transaction plus payment processing), and Amazon Individual (15% referral plus $0.99 per item).
The tax layer uses marginal tax calculation: it computes your total tax at your stated annual income level, then computes the additional tax generated by each item's profit. This marginal approach is more accurate than applying a flat tax rate because it captures the actual bracket your reselling income falls into. The tax engine applies self-employment tax (15.3% on 92.35% of net profit per Schedule SE), federal income tax using 2026 brackets, and state income tax. The minimum sell price feature uses binary search to find the lowest sale price that yields your target profit after all fees and taxes.
Tyler sources vintage Nike sneakers from thrift stores and resells them online. He buys a pair for $25 and lists it at $75. He ships for $8 and has about $20,000 in total annual resale income. Filing as single in Florida (no state income tax), he wants to know which platform gives him the best profit.
On eBay, the 13.6% fee plus $0.40 comes to $10.60, leaving $31.40 after fees and shipping. Estimated tax on that profit is about $7.36 (a blend of SE tax and federal income tax at his bracket), leaving a true net profit of $24.04. On Poshmark, the 20% fee takes $15.00, leaving $27.00 after fees and shipping, with $6.32 in tax for a true profit of $20.68. Mercari's 10% fee ($7.50) yields a true profit of $26.42, and FB Marketplace's 10% shipped-order fee ($7.50) lands in the same place. Without the tax layer, Tyler would have seen the fee difference but not the full picture: he keeps $26.42 on Mercari or FB Marketplace versus $24.04 on eBay, a $2.38 per-item difference that adds up across hundreds of sales.
Use this calculator before listing high-value items to determine which platform maximizes your profit after fees and taxes. It is particularly useful when you cross-list items on multiple platforms and need to decide where to accept an offer. The batch mode is designed for monthly or quarterly profit reviews: enter your last 20 sales to see aggregate revenue, total fees, estimated tax liability, and true profit. This data is essential for making accurate quarterly estimated tax payments and avoiding underpayment penalties. Run it before sourcing decisions too, since the minimum sell price feature tells you exactly what you need to sell an item for to hit your profit target on each platform.
Yes. If you sell items for more than you paid for them, the profit is taxable income. Under the One Big Beautiful Bill Act, platforms like eBay, Poshmark, and Mercari only have to send a federal Form 1099-K once your sales pass $20,000 and 200 transactions, though some states require one at lower amounts and a platform may send one anyway. You owe income tax and self-employment tax (15.3%) on your net profit after deducting COGS, fees, shipping, and other business expenses. Selling personal items at a loss is not taxable, but you need records to prove the loss.
Each marketplace has a different fee structure. eBay uses a percentage-based final value fee plus a fixed per-order charge. Poshmark uses a tiered system (flat fee under $15, percentage over $15). Mercari charges a flat 10%; Depop charges US sellers no selling fee, only payment processing. Etsy combines a transaction fee, listing fee, and payment processing fee. Amazon charges a referral percentage plus a per-item fee for individual sellers. These differences mean the same $75 sale produces significantly different net amounts depending on where you list. That is exactly why comparing across platforms matters.
COGS includes the amount you paid to acquire the item you are reselling. This covers thrift store purchases, wholesale costs, retail arbitrage buys, garage sale finds, and any direct acquisition costs. Sales tax you paid on the original purchase is also part of COGS. However, overhead expenses like shipping supplies, storage fees, photography equipment, and mileage to sourcing locations are separate business expenses that you deduct on Schedule C. Both COGS and business expenses reduce your taxable profit.
Batch mode lets you enter up to 20 items at once, each with its own buy price, sell price, platform, and shipping cost. The calculator processes all items simultaneously and produces a sortable results table showing per-item profit, fees, tax allocation, and ROI. Tax is calculated on your aggregate profit (not per-item) for accuracy, then proportionally allocated back to each item. The footer row shows totals for quick reference. You can sort by any column to find your most and least profitable items.
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