eBay knows what sold. It never saw what you paid.

Seller Hub is a good report about one half of your business. It has your sale prices, your fees and your postage labels, and it is authoritative about all of them. What it structurally cannot know is what the item cost you, because that happened in a car park, in cash, three months before you listed it.

The missing half is the one that decides everything

Without a cost basis, every eBay report you can produce is revenue dressed as performance. A month with four thousand in sales looks identical whether the stock cost you eight hundred or three thousand two hundred.

It also breaks the decision you make most often. Standing in a shop holding something at twelve pounds, the question is whether things like this have historically returned enough to be worth twelve pounds. That is a question about cost, and no marketplace dashboard can answer it.

So the cost basis has to be recorded somewhere that survives, at the moment of buying, attached to the specific unit. Everything else in reseller bookkeeping is arithmetic on top of that one habit.

Per payout is not per item

eBay pays out in batches. A payout covers several sales, minus fees, minus refunds, minus whatever adjustment landed that week. It is an accurate summary of money moving and a poor description of which items earned it.

Reselling decisions are per item. Which categories return best, which sources produce stock that sells, which things sat for nine months before going for less than you paid. None of those questions are answerable from a payout, and all of them are answerable if each sale is attached to the unit it emptied from your shelf.

Fees vary more than people assume

Final value fees differ by category, and there are per-order elements, optional listing upgrades, international variations and promoted listing rates that only apply to some of your sales. Any tool that applies one flat percentage across everything you sell is producing a plausible number rather than your number.

Recording what eBay actually deducted on that sale takes seconds and stays correct through every fee change and every category you branch into. It is also the version that matches your bank statement at the end of the year, which matters more than it sounds when somebody asks you to account for it.

Returns arrive after you have moved on

A refund in November against a sale in August rewrites a month you have already counted and, if you are unlucky, a quarter you have already reported. The item may come back to your shelf, in which case it is stock again and its cost basis is still yours to recover.

Records that cannot express "this sale partly reversed" force a choice between deleting the sale, which erases the fact that it happened, and leaving it, which overstates the year. Both are wrong, and the second is the one most people pick because it is less work.

How Flippo handles it

Record the purchase when you buy, split it into individual units, and record the sale with what eBay actually took. Flippo gives you profit and ROI per item, days on hand, sell-through, and a comparison across every platform you sell on, not just eBay. Refunds are recorded against the sale that they reverse.

It is not a crosslisting or listing tool and does not post to eBay for you. It runs in any browser including a phone browser, which is where the cost basis actually gets entered: standing in the shop, before you have forgotten what you paid.

If you are weighing the options, this comparison lists what the main tracking apps charge, including the ones with free tiers, checked at source.