Marisol filed her first reselling year the same way she filed her W-2: she ignored it until April. Then a 1099-K arrived from her marketplace, the IRS knew about every dollar that had crossed her account, and she spent three weekends reconstructing a year of cost basis from camera-roll screenshots. It cost her a tax preparer, a chunk of refund, and weeks of stress that would have been ten minutes a month if she had set up the basics on day one.
Reseller taxes aren't complicated once you understand the structure. The trap is procrastination, not arithmetic. Here's the plain-English overview every US reseller should read before their first full tax year ends—what you owe, what you can deduct, what the 1099 thresholds mean, and the year-round records that actually keep you compliant.
Important: This is general information for US-based individual resellers, not personalized tax advice. Rules change. Confirm specifics with a tax professional before filing.
Hobby vs Business: The Question That Sets Everything Else
The IRS treats reselling income differently depending on whether the activity is a hobby or a business. The distinction matters because:
- Hobby income is reportable, but most hobby expenses are not deductible against it.
- Business income is reportable on Schedule C, with ordinary and necessary expenses deductible against gross sales.
If you source intentionally, sell regularly, track results, and intend to profit, the IRS generally treats the activity as a business. Reselling more than a handful of items per month, advertising your listings, or running a booth or storefront all push you firmly into business territory.
For most active resellers, business treatment is both more accurate and more favorable, because it lets you deduct costs. The framework for that filing lives in the companion piece What Is Schedule C and Why Resellers File One.
What You Actually Owe
Active US-based reseller businesses generally face three categories of tax:
| Tax | What it is | Roughly |
|---|---|---|
| Federal income tax | On net profit from Schedule C | Varies by bracket |
| Self-employment tax | Social Security + Medicare on net profit | ~15.3% on most net profit |
| State income tax | Varies by state; some have none | 0–10%+ on net profit |
A common planning shortcut: set aside roughly 25–30% of your net profit (the number after expenses and COGS) for combined federal + self-employment tax. Add state if applicable. This is a rough reserve, not a final bill—your real liability depends on bracket, deductions, and credits.
Marisol's first year: $24K gross sales, ~$10K net profit after COGS and expenses. Her combined federal + SE + state was roughly $2,800. She had set aside $0. The shortfall hurt because she hadn't budgeted for it; the rate itself was reasonable.
Quarterly Estimated Taxes
If you expect to owe $1,000 or more in tax for the year (a low bar for most active resellers), the IRS expects quarterly estimated tax payments. Skipping them can result in an underpayment penalty even if you pay the full amount in April.
Estimated tax due dates are typically mid-April, mid-June, mid-September, and mid-January of the following year. Treat them like rent—a recurring calendar invite with a check (or an EFTPS scheduled payment).
The 1099-K Reality
The 1099-K is an information return that payment processors and marketplaces send the IRS for sellers above certain thresholds. The federal threshold has moved repeatedly in recent years and may continue to change—some states have stricter (lower) thresholds.
What hasn't changed:
- Income is taxable regardless of whether you receive a 1099. The form is a reporting trigger, not a tax trigger.
- If you do get a 1099-K, the gross amount reported is gross sales—not your taxable profit. You deduct costs separately on Schedule C.
- The 1099-K does not net out fees or refunds. Your tracking has to.
Marisol's first 1099-K showed gross sales that looked terrifying until she remembered she had spent over half on COGS and platform fees. The form is loud; the actual tax is on the net.
What You Can Deduct as a Reseller
Ordinary and necessary expenses against your reselling business are generally deductible on Schedule C. Common categories:
- Cost of goods sold — what you paid for items you sold.
- Platform fees and processing — eBay, Poshmark, Mercari, Whatnot, mall commission.
- Shipping and packaging supplies.
- Mileage for sourcing, drop-offs, supply runs (standard IRS rate or actual costs).
- Booth or storefront rent.
- Photography supplies and software used for the business.
- Inventory management software (like Inventr) and cross-listing tools.
- Phone and data for the business-use share.
- Insurance and business licenses where applicable.
- Home office if you have a dedicated space used regularly and exclusively for the business (talk to a preparer first).
- Education directly related to reselling—books, courses, conference fees.
For the full categorized expense map most booth and online resellers benefit from tracking, see Operating Expenses Every Booth Seller Should Track.
The Year-Round Records That Save April
You need three records active all year, not just at tax time:
- Item-level inventory log with purchase date, cost, sale date, and sale price. This is the spine of your COGS calculation.
- Categorized expense log (or business bank statements) for every business expense.
- Mileage log for sourcing and business trips—date, miles, purpose.
If you do these three things weekly, your April becomes a 90-minute task instead of a six-weekend ordeal. The pain of tax season is almost always the pain of reconstruction.
State and Local Considerations
State rules vary widely. Common things to check:
- State income tax on Schedule C net profit (most states; some have none).
- Sales tax collection — most marketplaces collect and remit on your behalf in most states, but verify for your channels.
- Local business licenses if you have a storefront or significant local sales.
- State-specific 1099-K thresholds that may be lower than federal.
The Five Habits That Make You Audit-Ready
- Track every item with date, cost, and sale price in one system.
- Run business expenses through a dedicated account.
- Log mileage in a phone app.
- Save quarterly tax reserves automatically (a separate savings account works).
- Reconcile monthly so you never have to reconstruct anything.
When to Hire a Tax Professional
Self-filing with software is fine for many resellers in their early years. Consider a preparer when:
- Your reselling income exceeds your day-job income.
- You operate across state lines or have inventory in multiple states.
- You're considering a business entity (LLC, S-Corp) for liability or tax planning.
- You have a 1099-K that doesn't match your own records.
- You're being asked to substantiate deductions on an IRS letter.
A good preparer who knows ecommerce or small-business returns usually pays for themselves the first year through deductions you missed.
The Calmest Version of Tax Season
Marisol's second year cost her three hours total: she opened her tracker, exported a CSV of items sold and expenses by category, handed it to a preparer, and signed the return. No April panic. No reconstructed mileage. No screenshots of marketplace fees from nine months ago. The difference was the habits, not the knowledge.
Taxes are not the scary part of reselling. They're the boring part with steep penalties for procrastination. Set up the habits in month one and the rest takes care of itself.