When does selling things online go on Schedule C, and when doesn't it?
The Schedule C instructions say it reports income or loss from a business you operated as a sole proprietor, and that an activity is a business if your primary purpose is income or profit and you are involved in it with continuity and regularity. The same instructions say a sporadic activity, a not-for-profit activity or a hobby doesn't qualify, and IRS guidance sends a gain on a personal item to Form 8949 and Schedule D and a personal item sold at a loss to the entry space at the top of Schedule 1.
General information from IRS sources, not tax advice. It doesn't say what you should file; check with a tax professional about your own situation.
Checked against the IRS pages listed below on .
What the IRS says
"For example, a sporadic activity, a not-for-profit activity, or a hobby does not qualify as a business."
"You can have business income even if you are not involved in the activity on a regular full-time basis."
"If you owned more than one business, complete a separate Schedule C for each business."
"Generally, if you and your spouse jointly own and operate an unincorporated business and share in the profits and losses, you are partners in a partnership, whether or not you have a formal partnership agreement."
Where IRS guidance points, by kind of sale
| What you did | Where the IRS guidance points |
|---|---|
| Sold your own used belongings for less than you paid | No tax on the loss. For 2025, the 1099-K amount goes in the entry space at the top of Schedule 1, or the sale goes on Form 8949 and Schedule D with an adjustment that brings the loss to zero |
| Sold your own belongings for more than you paid | The gain is figured on Form 8949 and Schedule D |
| Sold as an activity not engaged in for profit (a hobby) | Income on Schedule 1, line 8j |
| Bought goods to resell, regularly, for profit, as a sole proprietor | Schedule C |
| Same, through a single-member LLC that hasn't elected to be taxed as a corporation | Schedule C |
| Same, with your spouse as co-owners of an unincorporated business | Generally a partnership return (Form 1065), unless you qualify as a qualified joint venture or own it as community property |
What comes with Schedule C
- Self-employment tax on Schedule SE once net earnings from self-employment reach $400: see self-employment tax.
- Estimated tax payments if you expect to owe $1,000 or more: see estimated tax.
- Income you report on Schedule C may be qualified business income, which can mean a deduction figured on Form 8995 or 8995-A.
- Line I asks whether you made payments that would require you to file any Forms 1099: see 1099-NEC for helpers.
- Line B asks for a business code; the instructions say nonstore retailers select the code by the primary product they sell.
- The instructions add that you may be subject to state and local taxes and requirements such as business licenses, and to check with your state and local governments. Marketplace sales tax and state Form 1099-K rules are on the state pages.
Spouses who sell together
The Schedule C instructions say spouses who jointly own and operate an unincorporated business and share profits and losses are generally partners. They can instead elect to be a qualified joint venture if each materially participates, they are the only owners and they file a joint return; each then files a separate Schedule C with their share, and each may need a Schedule SE.
A business owned through an LLC doesn't qualify for the qualified joint venture election. In a community property state (the instructions list Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington and Wisconsin), spouses who wholly own an unincorporated business as community property can treat it as a sole proprietorship on one spouse's Schedule C.
Worked examples
Three sellers, three different kinds of sale
The first sells a couch she bought for $1,000 for $700: a personal item sold at a loss. The second sells a handbag he bought for $800 for $1,200: a $400 gain on a personal item. The third buys at estate sales every weekend to resell and keeps books on it: the kind of regular, for-profit activity the Schedule C instructions describe. Each lands in a different place on the return.
A couple's qualified joint venture
Spouses who both source and ship, own the business together and file jointly have $12,000 of net profit and elect qualified joint venture treatment, splitting by their equal interests. Each files a Schedule C showing $6,000, and each figures self-employment tax on their own share.
Edge cases
- A single-member LLC that elected to be treated as a corporation doesn't use Schedule C; the instructions point to Form 8832 for that election.
- If you started or acquired the business during the year, the instructions say to check the box on line H.
- Getting a Form 1099-K doesn't decide the form: the IRS says just because a payment is reported on a 1099-K doesn't mean it is taxable, and where it goes depends on the kind of transactions.
- Two separate businesses each get their own Schedule C, but self-employment tax combines them on one Schedule SE.
What to do
- Sort the year's sales into your own belongings and items you bought to resell, and keep cost records for each.
- If you're unsure whether your selling is a business, read the IRS hobby factors.
- If you sell with a spouse, look at the qualified joint venture and community property rules with a tax professional.
- Check with a tax professional before filing; this page describes the IRS instructions, not which forms fit your situation.
Questions
I only sell part-time. Can that still be a business?
Yes, it can. Publication 334 says you can have business income even if you aren't involved on a regular full-time basis, and the IRS's business activities page says a part-time business in addition to a regular job may also be self-employment.
Does getting a 1099-K mean my sales go on Schedule C?
No. The IRS says how you report Form 1099-K payments depends on the type of transactions: personal items sold at a gain or a loss are reported differently from goods sold in a business.
My spouse and I sell together. One Schedule C or two?
The instructions say a jointly owned and operated business is generally a partnership. With a qualified joint venture election, each spouse files a separate Schedule C; in a community property state, the business can be treated as a sole proprietorship on one spouse's Schedule C.
General information, not tax advice
This page summarizes IRS publications, instructions and guidance as read on . It doesn't say what you should file or deduct. Tax rules depend on your facts, and state rules aren't covered here (see state rules). Check with a tax professional.
Sources
Every figure, rule and quote on this page comes from one of these official pages.
- Instructions for Schedule C (Form 1040) (2025) (IRS, page reviewed or updated Apr 30, 2026; read Oct 19, 2026)
- Instructions for Form 1040 (2025) (IRS, page reviewed or updated May 7, 2026; read Oct 19, 2026)
- What to do with Form 1099-K (IRS, page reviewed or updated Jul 27, 2026; read Oct 19, 2026)
- Form 1099-K FAQs: What to do if you receive a Form 1099-K (IRS, page reviewed or updated Jun 27, 2026; read Oct 19, 2026)
- Publication 525 (2025), Taxable and Nontaxable Income (IRS, page reviewed or updated Apr 30, 2026; read Oct 19, 2026)
- Publication 334 (2025), Tax Guide for Small Business (IRS, page reviewed or updated Apr 30, 2026; read Oct 19, 2026)
- Business activities (IRS, page reviewed or updated Mar 26, 2026; read Oct 19, 2026)
- Instructions for Schedule SE (Form 1040) (2025) (IRS, page reviewed or updated Apr 30, 2026; read Oct 19, 2026)
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