LEGO Reselling Tax Guide: What Sellers Need to Know

Yes, money you make reselling LEGO sets, minifigures, or bulk parts counts as taxable income in the eyes of the IRS, whether you call it a side hustle or a real business. It doesn't matter if you're selling on eBay, Whatnot, BrickLink, Mercari, or just cash deals through Facebook Marketplace. Once you cross certain sales thresholds, a marketplace may also send you a 1099-K and report those sales to the IRS directly, which is the part that catches most new sellers off guard.

I've bought and sold LEGO across most of these platforms for years, and in my experience the tax side trips up more resellers than pricing or sourcing ever does. The good news is that once you understand a few core rules, hobby versus business status, self-employment tax, what counts as a deduction, and how 1099-K reporting actually works, this stops being scary and just becomes part of running the business. This guide is written from that experience, not from a tax office, so treat it as a starting map rather than a final answer for your own return.

• LEGO resale profit is taxable income no matter which platform you sell on.
• The IRS generally treats a reselling operation as a business, not a hobby, once you show a profit in at least 3 of the last 5 years.
• Self employment tax adds roughly 15.3% on top of regular income tax once you're running this as a business.
• 1099-K reporting thresholds have moved several times since 2021 and are still being phased in, so check the current year's threshold instead of assuming you're under it.
• Tracking what you actually paid for every lot, set, and minifigure (your cost basis) is the single best way to lower your taxable profit honestly.

Are LEGO Reselling Profits Taxable?

Yes. Any profit from reselling LEGO sets, minifigures, or parts is taxable income, whether you're clearing out a closet once a year or running weekly Whatnot shows. The IRS doesn't care that the inventory is plastic bricks instead of furniture or clothes. What matters is whether you're making a profit, and if you are, that profit needs to show up on your return in some form.

In my experience, the confusion isn't really about whether it's taxable. Most sellers already assume it is. The confusion is about how much is actually taxable, because people forget that tax applies to profit, not to the full sale price. If you bought a bulk lot for $200 and sold the pieces for $500 total, your taxable profit is closer to $300, not $500, once you factor in what you paid and any related costs. That distinction is where good recordkeeping starts paying for itself.

Hobby or Business: Which One Are You?

The IRS generally presumes you're running a business, not a hobby, if you show a profit in at least 3 of the last 5 years, and that classification changes what you can deduct. A hobby seller reports income but historically has had a much harder time deducting related costs, while a business can deduct ordinary and necessary expenses against that income.

From what I've seen, most people who start casually reselling LEGO end up tipping into "business" territory faster than they expect, especially once they're buying bulk lots with the intention of flipping them rather than just thinning out a personal collection. If you're sourcing from Facebook Marketplace, sorting inventory, and relisting on eBay or BrickLink on a repeated basis, that pattern looks like a business to the IRS even if you never filed any paperwork to "start" one. I personally treat it as a business from day one, because it forces better habits around tracking cost and expenses, and it's a lot easier to stay organized from the start than to reconstruct a year of purchases later.

How Does Self Employment Tax Work for LEGO Sellers?

Self employment tax is the roughly 15.3% combined Social Security and Medicare tax that applies to net profit once you're operating as a business rather than a hobby, and it comes on top of your regular income tax. That rate splits out to about 12.4% for Social Security and 2.9% for Medicare, and it applies to your net profit after deducting legitimate business expenses, not your total revenue.

This is the number that catches people off guard the most. A seller I know went from flipping a few lots on the side to running a full Whatnot schedule, and the jump from hobby-level sales to real self employment tax on a much bigger profit number was the first time taxes actually felt like a cost of doing business rather than paperwork. I recommend setting aside a percentage of every payout, even a rough estimate, into a separate account so you're not scrambling in April.

What Is the 1099-K and When Will You Get One?

A 1099-K is a form that payment platforms like eBay, Whatnot, and Mercari send to sellers (and to the IRS) once your sales cross a certain dollar threshold in a calendar year, and that threshold has been phased down gradually since a 2021 law change. Because the exact number has shifted year to year since then, and is still being phased in, you should check the current threshold directly with whichever platform you sell on rather than relying on an old number.

Here's the part that trips people up: getting a 1099-K does not mean all of that reported amount is taxable profit. It's the platform's record of gross sales processed through them, before you subtract what you paid for the inventory, shipping costs, or platform fees. BrickLink, by contrast, tends to run lower fees than some marketplaces, which is one reason a lot of resellers I know use it for individual parts and minifigures where every dollar of fee matters more on a $3 sale than it does on a $300 one.

What Expenses Can LEGO Resellers Deduct?

If you're running this as a business, you can generally deduct ordinary costs tied to generating that income, including the cost of the inventory itself, shipping supplies, platform and payment fees, and a portion of tools you use specifically for the business. The core idea is that you're only taxed on profit, so anything that legitimately reduced your profit should be subtracted before you calculate what you owe.

In my experience, the costs people forget most often are the boring ones: shipping boxes, bubble wrap, a scale, storage bins, and mileage to pick up a Facebook Marketplace lot. None of these feel like "real" business expenses when you're buying them, but they add up fast once you're doing dozens of lots a year. I use a simple habit of photographing receipts the day I buy anything, because trying to remember six months later whether a $40 Home Depot run was storage bins or something personal is a losing game.

How Should You Track Cost Basis and Inventory?

Cost basis is simply what you paid for an item, and tracking it accurately for every set, minifigure, and bulk lot is what lets you report real profit instead of guessing. Without it, you're stuck either overpaying tax on the full sale price or underreporting profit, and neither one is a good position to be in if your records ever get questioned.

When I sort a new bulk lot, I try to record what I paid for the whole lot and then allocate that cost across the pieces I plan to sell individually, even if it's a rough split based on known values. Tools like brick'em's LEGO collection value calculator make this a lot faster than a spreadsheet from scratch, especially when a lot has hundreds of minifigures and parts mixed together. If you're regularly buying lots and want to see your margin before you even commit to a purchase, running the numbers through a haul calculator first can save you from buying inventory that never clears a real profit once fees and cost basis are factored in.

Does Sales Tax Apply to LEGO Resales?

In most cases, marketplaces like eBay, Whatnot, and Mercari already collect and remit sales tax on your behalf for sales made through their platform, because of marketplace facilitator laws most states have adopted. That means you typically don't have to separately collect sales tax yourself on those transactions, but the rules can differ for private, cash, or local sales outside of a marketplace.

Where this gets murkier is local, in-person sales, like a deal made at a LEGO convention or a cash transaction through Facebook Marketplace. Those don't automatically have sales tax collected for you, so depending on your state and how much you're selling, you may have obligations there that a marketplace-based seller doesn't have to think about as often. I'd rather flag that gap honestly than pretend it doesn't exist, because it's genuinely state specific and changes depending on where you live and where the buyer is.

A Simple LEGO Reseller Tax Checklist

Here's a basic checklist I use to stay organized through the year instead of scrambling every April. None of this replaces working with a tax professional, but it covers the habits that make that conversation much easier when the time comes.

Task	Why It Matters	How Often
Record cost basis for every lot or set purchased	Lets you report real profit instead of full sale price	At time of purchase
Save receipts for supplies, mileage, and fees	These reduce taxable profit when documented	Weekly
Check current year 1099-K thresholds per platform	Thresholds have changed almost every year since 2021	Quarterly
Set aside a percentage of profit for taxes	Self employment tax plus income tax adds up fast	Monthly
Reconcile platform payout reports against your own log	Marketplace 1099-Ks show gross sales, not profit	Monthly
Review hobby vs business status for the year	Changes what you can legitimately deduct	Annually

What Mistakes Do LEGO Resellers Commonly Make With Taxes?

The most common mistake I see is treating the 1099-K number as the taxable amount, when it's really just gross sales before costs are subtracted. The second most common mistake is not tracking cost basis at all, which means sellers either overpay out of fear or underreport and hope nobody asks. Both come from the same root problem: not keeping records as you go.

I started brick'em partly because I noticed how much time resellers waste reconstructing their own numbers months after the fact, instead of logging things once at the time of purchase or sale. Whether you're scanning a bulk lot of minifigures or logging a single sealed set, the habit of recording cost and sale price together, in one place, is what separates a clean tax season from a stressful one. If you haven't set up a system yet, it's worth starting a 14-day free trial of an inventory tool before your next big haul rather than after it.

Frequently Asked Questions

Do I owe taxes if I only sell a few LEGO sets a year?

Possibly, but it depends on whether the IRS would view the activity as a hobby or a business and whether you turned a profit. Occasional sales of personal items at a loss generally aren't taxable the same way, but repeated profitable sales, even a handful a year, can still count as taxable income you need to report.

What happens if I get a 1099-K but didn't actually profit?

You still report the form, but you can offset it with your cost basis and expenses to show the real profit or loss, which may be much lower than the 1099-K total. Keeping records of what you paid for each item is what makes that offset possible, so don't ignore the form just because it looks high.

Can I deduct the cost of LEGO sets I bought to resell?

Generally yes, if you're operating as a business, the cost of inventory you bought specifically to resell is deductible against the income from selling it. The key is documenting what you paid, which is much easier if you log purchases as you make them instead of trying to remember later.

Is BrickLink or eBay better for keeping taxes simple?

Both report sales similarly once you cross reporting thresholds, so neither is inherently simpler from a tax standpoint. In my experience the bigger factor is your own tracking habits, not which platform you use, since the underlying tax rules apply the same way across eBay, Whatnot, Mercari, and BrickLink.

Should I set up an LLC for LEGO reselling?

Some sellers I know do this once their volume grows, mainly for liability and organizational reasons, but it isn't required to simply report and pay tax on resale profit as an individual. This is a decision worth discussing with a tax or legal professional based on your specific sales volume and risk tolerance.