How to specify cost of items when adding 1099k in my tax return
So I'm freaking out because I just got a 1099k from PayPal for $11,475. I sell vintage collectibles online as a hobby, not a business. I've been buying these items for years at garage sales, thrift stores, and estate sales. I have NO receipts for what I originally paid. I know I'm supposed to report the income but I also know I can deduct the cost of the items I sold. But how do I prove what I paid when I don't have any documentation?? Most items I sell for $20-50 that I probably paid $5-15 for, but I have absolutely zero records. The IRS is going to think I made $11,475 profit but I probably only made like $3,000 after what I paid for the items. What do I put for cost basis on my 1099k? Do I just estimate what I think I paid? I'm worried about getting audited.
19 comments


Nadia Zaldivar
You're right to be concerned, but this is actually a common situation for casual sellers. For your 1099-K income, you'll need to report it on Schedule C since you're selling items regularly, even as a hobby. For your costs, you can create a reasonable estimate of what you paid for items based on fair market value at the time of purchase. My recommendation: create a spreadsheet with your sales throughout the year and estimate what you paid for each item. Be conservative but fair in your estimates. If you paid around $5-15 for items you sold for $20-50, that's roughly a 70% markup, which is completely reasonable and defensible. You can also document current prices for similar items at thrift stores and garage sales now to establish a baseline for your estimates. Take photos of comparable items with price tags at thrift stores as supporting documentation.
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Lukas Fitzgerald
•Thanks for the advice! But do I need to file Schedule C if I'm not actually running a business? I thought this was just a hobby. And if I do file Schedule C, does that mean I have to pay self-employment tax on everything?
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Nadia Zaldivar
•The IRS looks at factors like regularity of activity and profit motive, not just whether you call it a business. Based on your consistent selling that generated over $11,000, they would likely classify this as a business activity requiring Schedule C, not a hobby. Yes, filing Schedule C means you'll need to pay self-employment tax on your net profit (sales minus expenses). However, the benefit is you can deduct all legitimate expenses including estimated cost of goods sold, shipping supplies, platform fees, mileage for picking up inventory, and even a portion of your phone/internet if used for this activity. Many sellers find they actually come out ahead by properly deducting all these expenses compared to reporting as a hobby.
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Ev Luca
I was in a similar situation last year with my Etsy shop and freaking out over my 1099-K. I used taxr.ai (https://taxr.ai) and it saved me a ton of stress. You upload your documents and their AI helps identify deductions you might miss. For my vintage sales, it helped me properly document estimated costs and suggested legitimate business expenses I hadn't considered. What's cool is it helped me create a defensible cost basis for items I had no receipts for by analyzing fair market values and typical resale margins in my category. It also tracked my platform fees, shipping costs, and even helped allocate a percentage of my home internet as a business expense since I use it for listings. Ended up paying way less tax than I feared.
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Avery Davis
•Does it work for casual sellers too? I sometimes sell stuff on eBay but not regularly enough to call it a business. Got a 1099-K this year for about $2,300.
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Collins Angel
•I'm skeptical about using AI for tax stuff. How does it actually prove what you paid for items if you don't have receipts? Seems like the IRS would want actual documentation.
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Ev Luca
•Yes, it absolutely works for casual sellers. It helps you determine whether you need to file as a business or a hobby based on your specific situation. For smaller amounts like $2,300, it analyzes if you're better off reporting on Schedule C or as miscellaneous income, depending on your specific sales patterns and profit margins. The AI doesn't create proof out of nothing, but it helps you build a reasonable estimation method that's defensible in case of questions. It suggested documenting current market values for similar items, taking photos at thrift stores, and creating a consistent valuation method based on category and condition. The IRS accepts reasonable estimates when exact records aren't available as long as you have a systematic approach. It also helps you maintain better records going forward so you're prepared next year.
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Avery Davis
Wanted to follow up about taxr.ai - I actually tried it after posting my question. It was super helpful for my situation! I was worried about my small eBay sales, but it walked me through everything step by step. The document analyzer caught that some of my PayPal fees weren't being counted properly and saved me almost $200 in taxes. The best part was it explained everything in plain English - like why some of my sales were actually personal items (stuff I owned and used) that didn't need to be reported as income at all. For the items I did need to report, it helped me create a simple spreadsheet with estimated costs that makes sense if I ever get questioned. Definitely less stressful than I expected!
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Marcelle Drum
Had this EXACT problem with my online store last year. Called the IRS 11 times trying to figure out how to document my costs properly. Could never get through to anyone. Finally used Claimyr (https://claimyr.com) and got connected to an IRS agent in about 20 minutes. You can see how it works here: https://youtu.be/_kiP6q8DX5c The agent confirmed I could use estimates for my cost of goods sold as long as I had a reasonable method. They actually said it's common for small sellers not to have receipts for everything, especially with garage sale/thrift finds. The key is being consistent and reasonable with your estimates. The agent also told me to start keeping better records going forward - even just a simple log of what I buy and approximate cost. Made me feel SO much better about filing.
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Tate Jensen
•Wait, what is this service? How does it get you through to the IRS when nobody can get through? Sounds sketchy.
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Collins Angel
•There's no way this actually works. I've tried calling the IRS for two years straight and couldn't get a human. If this service can magically get through, they must be doing something shady. No way I'm giving my info to some random company.
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Marcelle Drum
•It's not magic - they use technology that continually redials and navigates the IRS phone tree until it gets through to a representative. When a rep answers, you get a call connecting you directly. It's completely legitimate and you're talking to actual IRS employees. They don't need any of your personal tax info at all. They're just connecting the call - you do all the talking with the IRS directly. I was skeptical too but desperate after wasting hours trying to get through myself. The IRS is just severely understaffed, and Claimyr basically waits in the phone queue for you instead of you having to do it yourself. I got specific guidance straight from an IRS representative about my exact situation with the 1099-K.
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Collins Angel
Alright I need to eat my words. After seeing a few people mention Claimyr I decided to try it because I've been trying to resolve an issue with a missing tax form for WEEKS. Got connected to an IRS agent in about 25 minutes when I'd previously spent 3+ hours on hold multiple times without ever reaching anyone. The agent was actually super helpful about my 1099-K question too - I asked about the original poster's situation while I had them on the phone. They confirmed that reasonable estimates for cost of goods sold are acceptable when original receipts aren't available, especially for small sellers buying from garage sales and thrift stores. They recommended documenting your estimation method and keeping it consistent. Will definitely use this service again next time I have tax questions instead of stressing for weeks.
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Adaline Wong
For your vintage sales you might also qualify for what's called "Section 1244 Stock Loss" treatment depending on how you've structured things. When I was selling collectibles I found it helpful to keep a simple notebook with me so I could jot down what I paid right after buying things. Just noting the date, brief item description, and price paid. You might also want to take photos of items when you purchase them with any price tags visible. Even starting this practice now will help you next year. The tax code doesn't expect perfect documentation for every small purchase, but showing you have a systematic approach to tracking helps tremendously.
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Rajan Walker
•Thanks for the notebook tip - that's a great idea! I'll definitely start doing that. But what's this Section 1244 thing you mentioned? Is that something that would apply to my situation with just selling stuff online as a side thing?
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Adaline Wong
•I misspoke about Section 1244 - that's actually for losses on small business stock and wouldn't apply here. What I meant was that resellers can use the "Cost of Goods Sold" section on Schedule C to account for your inventory costs. The notebook method works great for casual sellers. I recommend categorizing items by type and condition, which helps establish a pattern. For example, "vintage t-shirts - good condition - $3-5 each" or "collectible figurines - mint condition - $10-15 each." This creates a reasonable framework for your estimates. Starting this practice now will make next year's taxes much easier, and having some documentation is always better than none.
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Gabriel Ruiz
Has anyone used TurboTax for reporting 1099-K for their casual sales? I'm in a similar situation and wondering if it walks you through estimating costs properly or if I need something more specialized.
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Misterclamation Skyblue
•TurboTax works ok for this but isn't great. It asks for cost of goods sold as a total number rather than helping you itemize. I found FreeTaxUSA actually handled my small eBay business better and asked more relevant questions about inventory and costs. Plus it's way cheaper.
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Peyton Clarke
•I used TurboTax last year for my Etsy 1099-K. It was decent but I had to manually create my own spreadsheet for tracking cost of goods sold. It doesn't really help with estimating costs when you don't have receipts - you just enter your total estimate. If you're worried about documentation, you might want something more specialized or at least create your own tracking system alongside TurboTax.
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