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 upgrade their personal collection, to clean out duplicates, or to fund the next box break.
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, extended under the One Big Beautiful Bill Act, eliminated the miscellaneous itemized deduction that hobby expenses used to flow through. 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, grading fees, supplies, platform commissions, mileage. None of those costs come back to the hobbyist on their tax return.
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, grading fees, shipping, platform fees, mileage, software, and home office all reduce taxable income.
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), you can expense the box at purchase. 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.
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 to fund your hobby or upgrade your collection: 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), you report the gross sale price on Schedule C Line 1 and the seller's commission as a Line 10 expense; you don't net the income. 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. KKATC Cards handles both sides in the Consignors tab.
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 IRS has not issued definitive guidance on which modern cards qualify; tax practitioners typically apply the 28% rate to vintage cards and analyze modern cards case-by-case.
Short-term capital gains (held 1 year or less) tax at your ordinary income rate.
Most card resellers do not qualify for capital gains treatment because their activity is dealer-level. Capital gains is the right answer only for genuine long-term investors.
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. Several states set theirs much lower; the lowest in 2026 are Rhode Island ($100), Massachusetts ($600), Vermont ($600), and New Jersey ($1,000).
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.