Let's start simple. The IRS doesn't care that you love cards. It cares whether your card activity makes you money, costs you money, or breaks even. Three different answers map to three different tax situations. Most card people fit into one of three categories: hobbyist, dealer, or breaker. Each one files differently. Each one pays a different amount of tax for the same dollar of activity. Knowing which one you are is the most important tax decision you'll make this year.
The three tax personas
A hobbyist sells cards occasionally. Maybe a few cards a month, maybe a few cards a year. The motivation is the hobby itself, not the income. A hobbyist might sell to clean out duplicates or to fund the next box break. Selling now and then from a personal collection is collecting rather than a hobby activity: those sales go on Form 8949, and the costs of collecting are personal expenses under IRC §262(a), never deductible.
A dealer (also called an active reseller) buys cards specifically to sell them at a profit. The dealer tracks inventory, has a system, and treats the activity as a business. The motivation is the income.
A breaker opens sealed product (boxes, cases, hobby boxes, jumbo packs) live or recorded, and sells the cards as they come out, usually as spots, hits, or random teams. Breakers are dealers with a specific operational model. The tax treatment is the same as a dealer, but the inventory mechanics are more complex because sealed product is itself inventory until opened.
Hobbyist
A hobbyist files their card income on Schedule 1, line 8j. The form line title is "Activity not engaged in for profit," which is the IRS technical name for "hobby."
Income is taxable. The full sale price is reported as ordinary income, taxed at your normal income tax rate.
Operational expenses are not deductible. The Tax Cuts and Jobs Act of 2017 suspended the miscellaneous itemized deduction that hobby expenses used to flow through (IRC §67(g), for 2018 to 2025), and the One Big Beautiful Bill Act (P.L. 119-21) made the rule permanent from 2026 (IRC §67(h)). A hobbyist can still subtract the cost basis of the card itself (basis reduction is a different mechanism than expense deduction); so a hobbyist who sold a $400 card they paid $300 for owes tax on the $100 gain. What disappears is everything else: shipping, supplies, platform commissions, mileage. None of those costs come back to the hobbyist on their tax return. A grading fee is treated differently from those costs: KKATC Cards adds it to the card's cost basis, so it is subtracted from the amount realized with the rest of the basis when the card is sold.
This is the harshest tax treatment in the card world. It applies to anyone who sells regularly without operating like a business.
Dealer (active reseller)
A dealer files on Schedule C (Profit or Loss From Business). Schedule C is part of Form 1040 and is where every self-employed person reports business income.
Income is taxable. Gross sales for the year go on Schedule C Line 1.
Expenses are fully deductible if they are ordinary and necessary per IRC §162. Cost of goods sold (the cost of cards you sold), supplies, shipping, platform fees, mileage, software, and home office all reduce taxable income. In KKATC Cards, a grading fee you apply to a submission is divided evenly among the cards in that submission and added to the cost basis of each one. It is recovered when the card leaves your hands, not in the year you paid it. For a card held for sale to customers, the fee is part of the card's inventory cost and is recovered through cost of goods sold on Schedule C when the card sells.
Self-employment tax applies. A dealer pays 15.3% self-employment tax on net profit over $400, on top of federal income tax.
This is the standard treatment for a working reseller. It is also the most generous treatment in the card world, because deductions can dramatically reduce taxable income.
Breaker
A breaker is a dealer with a specific operational pattern. Schedule C is the form. The differences are in inventory accounting:
Sealed product is COGS. When you buy a hobby box for $200, that $200 is inventory until the box is opened and the cards are sold. Under the §471(c) election (TCJA small business taxpayer exception, available for businesses below the §448(c) small-business threshold of $32 million for TY2026 under IRC §448(c)(4); Rev. Proc. 2025-32; the threshold is adjusted annually for inflation, TY2025 was $31M; verify the current-year figure at IRS.gov before filing), the box cost is still recovered as the cards from it are provided to buyers, in the later of that year and the year you paid for the box (Treas. Reg. §1.471-1(b)(4)(i)); the election changes how you keep the books, not the year of the deduction. Under traditional §471(a), the unsold cards from the box stay as inventory.
Spot sales are revenue. When a buyer pays $30 for a spot in your random teams break, that $30 is gross revenue. The platform fee is a deductible expense. The cost basis of any card pulled in that buyer's spot is COGS. If the buyer pulls a $300 hit, that $300 is the buyer's card, not your inventory.
The date that matters is the day you bought the box, not the day you broke it. A box still sealed on December 31 is in your closing inventory at its cost, and its cost is recovered as its cards and spots sell. For an investor who opens a box to keep cards, the holding period of a card from it is generally measured from the box's purchase date; that is an interpretation, not settled law (IRC §1223 addresses carried-over holding periods, not this case). The break date is a record of what happened, never a tax date.
Consigned cards complicate things further. If you break sealed product on consignment for someone else, the revenue model splits between principal (you, the breaker) and the consignor. The principal-model accounting tracks the split inline at sale. KKATC Cards handles this in the Consignors tab.
Breakers typically need more sophisticated tracking than other dealers because each break involves multiple transactions across multiple buyers and multiple cards.
Quick decision tree
If you sell cards regularly with the intent to make money: dealer or breaker (Schedule C).
If you sell cards occasionally from a personal collection: collector (each sale on Form 8949; a loss is not deductible, and the costs of collecting are personal expenses under IRC §262(a)).
If you run an ongoing card activity without a profit motive: hobbyist (Schedule 1 line 8j).
If you open sealed product and sell spots to buyers: breaker (Schedule C, with the inventory complications above).
If you bought cards purely as long-term investments, never to flip, and they appreciated in value before you sold: capital gains on Schedule D and Form 8949 (different from any of the above).
The decision is not about how much you sold. A small hobbyist who sells $300 in cards a year is still a hobbyist. A dedicated reseller who sold $300 in cards last year because they had a slow year is still a dealer. The IRS hobby vs business test (Treas. Reg. §1.183-2(b)) looks at intent and operational pattern, not gross sales.
Consignment adds a wrinkle. If you're a consignor (your cards are being sold by someone else), what you report depends on why you held the card that sold, not on how you describe yourself overall. Holding purpose is decided card by card, so one person can be in all three of these positions across different consignments.
If the card was business inventory, the full sale price is gross receipts on Schedule C, the consignment house's commission is a separate Schedule C expense, and self-employment tax applies.
If the card was held as an investment, only the gain is income. The sale goes on Form 8949 and flows to Schedule D, long-term or short-term by the one-year holding-period test (IRC §1222), and the commission reduces the amount you realized on the sale, which is the same thing as an adjustment on Form 8949. It is never a separate itemized deduction, and there is no self-employment tax.
If the card was part of a personal collection, only a gain is income, with the same Form 8949 treatment of the commission. A gain is taxable; a loss is not deductible (IRC §165(c)). There is no self-employment tax.
Where the commission goes matters, because a seller who moves it can lose it. Treated as an investment expense under IRC §212, it would be a miscellaneous itemized deduction, not allowed for 2018 to 2025 (IRC §67(g)) and, under P.L. 119-21, from 2026 (IRC §67(h)), so it would be worth nothing. Treated as a cost of the sale, it is absorbed into the gain and is never at risk.
In all three cases keep gross and net apart. A Form 1099-K reports the gross payment (IRC §6050W), so a return built on the net amount the house sent you will not match the information return.
If you're a consignee (you're selling someone else's cards on consignment), you report the gross sale as revenue and the consignor's payout as a Line 10 expense; the consigned cards never enter your inventory. The Consignors tab in KKATC Cards covers this side, the consignee's. If your own cards are consigned to someone else, record each sale as your own sale, with the house's commission as a selling cost; KKATC Cards has no separate record for the consignor's side.
For deeper coverage, see "Hobby to Business: When Does the IRS Care?"
Why the same activity can be a hobby OR business
The same person can shift categories over time. A casual collector who starts breaking boxes every week and tracks inventory becomes a dealer. A dealer who liquidates their inventory and stops sourcing new cards reverts to hobbyist or capital gains treatment for whatever they hold.
The IRS accepts this transition. What it doesn't accept is filing one way and operating the other way. A reseller who files as a hobbyist to avoid self-employment tax, while also tracking inventory and selling consistently, has a problem if audited. A casual seller who files as a business to claim deductions, without any of the operational signals of a real business, has a different problem.
File the way you actually operate.
Capital gains for vintage investors
Some collectors buy vintage cards as long-term investments, hold them for years, and eventually sell. If the activity is genuinely investment (no flipping, no business operation, no inventory tracking), the sale qualifies for capital gains treatment on Schedule D and Form 8949.
Long-term capital gains (held more than 1 year) generally tax at 0%, 15%, or 20% depending on your income bracket. However, IRC §1(h)(4) imposes a maximum 28% rate on long-term gains from collectibles, with §408(m) defining the term. Sports cards classified as collectibles for §408(m) purposes are subject to the 28% rate. The conservative reading leads with that 28% rate, with the 0, 15 or 20% rate shown beside it as the alternative; the question only arises for a card held more than one year (IRC §1222), since a shorter holding is taxed at ordinary rates under either reading. The IRS could settle it by guidance at any time. The IRS has not issued guidance naming any card, and §408(m)(2) names none, so whether a card is a collectible is not settled; this product shows both rates and applies neither.
Short-term capital gains (held 1 year or less) tax at your ordinary income rate.
Cards you received as a gift
A card you were given carries two basis figures (IRC §1015(a)). For a gain, your basis is the giver's basis. For a loss, it is the lower of that and the card's fair market value on the date of the gift. A sale price between the two gives neither a gain nor a loss. Keep both figures from the day you receive the card: whether a loss is deductible is decided only when you sell (a personal-collection loss is not deductible under IRC §165(c)), and a collector can later become a dealer. Gift tax paid on the gift can add to basis (IRC §1015(d)), and the giver's holding period carries over to you (IRC §1223(2)).
The 3.8% net investment income tax
An investor's or collector's gain on a card is net investment income (IRC §1411(c)(1)(A)); a dealer's gain from an active business is not. The 3.8% tax applies only above a modified adjusted gross income threshold, and it is figured on the lesser of your net investment income and the amount over the threshold, two figures from your whole return. KKATC Cards does not hold those figures, so it flags the tax and does not compute it.
If an investment card sells at a loss instead, the loss first cancels capital gains and then only a limited amount comes off ordinary income each year; Selling Cards at a Loss walks through the order, the yearly limit, and why a personal-collection card gets no loss at all.
1099-K applies to all of you
Whether you're a hobbyist, dealer, breaker, or investor, the platforms you sell on report your gross sales to the IRS via Form 1099-K. The current threshold under OBBBA is $20,000 in payments AND 200 transactions per third-party payment network. KKATC Cards covers the federal return only and does not track state 1099-K thresholds; a state can set its own, so check with your state's revenue department.
The 1099-K is a payment processor reporting form, not a tax determination. Receiving one doesn't make you a business. Ignoring one doesn't make the income disappear. The IRS receives the same form and matches it against your return. Where the income lands on your return (Schedule C for dealers/breakers, Schedule D for investors, Schedule 1 line 8j for hobbyists) depends on your activity type. Even if you sold cards at a loss, you still have to report the 1099-K amount and reconcile against cost basis. Silence on a 1099-K is the audit trigger, not the underlying tax outcome.
Bottom line
Hobbyist, dealer, breaker, or investor: each one has a tax form and a tax outcome. Filing the right form for your actual activity is the difference between paying what you owe and either overpaying as a hobbyist or underpaying with a paper trail that doesn't match reality. Pick the category that fits, file accordingly, and document everything.
KKATC Cards Tax tab determines your Schedule C line items based on your activity pattern. The Plain English toggle explains every line.
This is general tax information, not tax advice. Talk to a CPA or enrolled agent about your specific situation.