What Happens If I Can't Find the Original Receipts for Things I'm Selling Online?
Selling a stack of old belongings online and later realizing there’s a tax question attached — what did each item originally cost — can be a genuine problem when the receipts, if they ever existed, are long gone.
The quick answer
When an original purchase price can’t be documented, the general approach is to make a reasonable, good-faith estimate of what the item cost when new, using whatever evidence is available, and to keep a record of how that estimate was reached. Tax rules don’t require an original receipt for every item, but they do expect a defensible basis for the number used, especially if the item sold for a meaningful gain.
Why cost basis matters here
Gain or loss on a sale is generally calculated as the difference between the sale price and the original cost, so without a documented cost, there’s no clear way to know whether a sale even produced a taxable gain. For most personal-use items sold at a loss — used furniture, clothing, older electronics — this is largely academic, since losses on personal property generally aren’t deductible anyway. It becomes more relevant when an item sells for more than it plausibly cost, which is more common with collectibles, vintage items, or anything that appreciated after purchase.
Reasonable ways to estimate a missing cost
- Credit card or bank statements. Even without the original receipt, a statement showing a purchase from around the right time and store can support a reasonable cost estimate.
- Comparable pricing from around the purchase date. If the item is a known model or product, historical pricing information can support a reasonable estimate of what it likely cost when new.
- Photos, manuals, or warranty cards. These sometimes include dates or purchase details that help narrow down a reasonable range.
- A documented, conservative estimate. When no records exist at all, using a cautious, well-reasoned estimate — and writing down the logic used to arrive at it — is generally considered more defensible than guessing without any explanation.
What tends to trigger this question in the first place
A lot of casual online sellers only run into cost-basis questions after a payment app or marketplace issues a tax form for the year’s total sales, prompting a closer look at which of those sales, if any, actually produced a gain. That’s a separate question from what to do if a payment app sends a tax form for transfers that weren’t really sales, but the two often come up around the same time for people selling online regularly.
When this shifts from a hobby into something more
Selling occasional personal items is treated differently than running an ongoing resale operation, and the more consistent and profit-driven the selling becomes, the more it starts to resemble a business rather than occasional personal sales — which changes the recordkeeping expectations. It’s worth understanding what happens if a side activity gets treated as a hobby instead of a business, since that distinction affects what can be estimated versus what needs more rigorous documentation going forward.
Putting it in perspective
Missing receipts aren’t a dead end — a reasonable, documented estimate is an accepted starting point when better records don’t exist, and the standard is defensibility rather than perfection. Going forward, keeping basic records for anything of meaningful value avoids this problem entirely, which ties into the broader question of how long tax records generally need to be kept. The same basis concept comes up in other contexts too, including what a stepped-up basis means for an inherited house, where the starting value is handled differently but the underlying question — what number a gain gets measured against — is the same.