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Cost basis is what a card cost you, properly counted: the purchase price plus shipping in, sales tax, and grading. It is the number subtracted from your sale price to get the gain, and it is the only defense you have against a marketplace reporting your gross sales as though all of it were profit.
It is also the number most likely to be missing. Cards are bought in lots, graded months later, and sold years after that, and each of those steps is a chance for the original cost to fall out of the record.
Direct answer: track basis per card, not per order. Capture the purchase price and date at the time of buying, add grading and inbound shipping as they happen, and record selling fees against the sale. A card is the unit that gets sold, so it has to be the unit that carries the cost.
Two piles, and it matters less than people think which pile a cost lands in, because both reduce the gain. What matters is that nothing gets forgotten entirely.
| Cost | Where it belongs | Commonly missed? |
|---|---|---|
| Card purchase price | Basis | No |
| Shipping paid to receive it | Basis | Yes |
| Sales tax paid | Basis | Yes |
| Grading fee and shipping both ways | Basis | Very often |
| Marketplace commission | Reduces proceeds | Sometimes |
| Shipping and supplies to send it out | Reduces proceeds | Very often |
You paid $400 for a box lot with one card worth having and forty that are not. Two years later the good one sells for $900. What was its basis?
Not $400, because you still own the rest. Not $10, because dividing by forty-one pretends they were all worth the same. The workable answer is to allocate the purchase price across the cards in proportion to what each was worth at the time you bought it, so the hit carries most of the cost because it was most of the reason you paid.
The percentages are your judgment at the time of purchase, so write down how you arrived at them while you still remember. A method you can explain and apply consistently is worth far more than a precision you cannot support.
When a raw card comes back as a PSA 9, the grading fee and the shipping both ways join its basis. What should not happen is the card becoming a new record with the original purchase price lost behind it, which is exactly what tends to happen in a spreadsheet where grading is tracked on a separate tab.
The related trap is the opposite one: if you own a raw copy and a graded copy of the same card, they are two assets with two different costs and two different values. Merging them into a single row with a quantity of two destroys the basis on both.
Everything above is easy on the day you buy and painful two years later. The purchase price is right there in the order confirmation, the date is exact, and you remember what you thought the lot was worth and why. All of that decays.
Every card you bought online is already recorded somewhere, with a date and a price attached, in the purchase history of the marketplace you bought it from. That is the basis you are trying to reconstruct, sitting in a place nobody looks.
Exporting it and turning those orders into card records is a fundamentally easier task than typing a collection out by hand, and the numbers arrive correct rather than remembered.
This is general information rather than tax advice. Basis rules interact with whether you are treated as a hobby seller, an investor or a dealer, and that question is worth putting to a CPA if you are selling seriously.
Turn your eBay buying into card records that keep what you paid, what grading cost, and what each one finally sold for after fees.
The price you paid for the card, plus the costs of acquiring and improving it: inbound shipping, sales tax, grading fees, and the shipping to and from the grader. Costs of selling, such as marketplace commission and outbound shipping, are normally treated as reducing your proceeds rather than adding to basis. Either way they reduce the gain, which is why every one of them is worth capturing.
Allocate the total across the cards in a way you can explain and apply consistently. Splitting by relative market value at the time of purchase is the most defensible approach for a lot with one obvious hit and a pile of commons. Dividing evenly is simpler but distorts badly when one card carries most of the value. Whichever you choose, write down the method and use the same one every time.
Generally yes for someone holding cards as investments: grading is a cost of putting the card into the condition in which it is sold, so it is capitalized into basis rather than deducted separately. A dealer running a business handles the same cost inside inventory and cost of goods sold. The one treatment where it does not help is hobby selling, where associated expenses are currently not deductible.
Reconstruct it from whatever evidence exists: order history, payment records, or a dated invoice from a show. Where nothing exists, a documented, reasonable estimate is better than a guess made at filing time, but be aware that basis you cannot support may be challenged, and an unsupported basis of zero means the entire sale price is treated as gain.
Not as something on hand. Cost is incurred at purchase, so the money is already spent and belongs in your records, but a card in the post cannot be sold and should not be counted in what you physically hold. Tracking in transit as its own status keeps both facts true at once.