To keep track of eBay sales for taxes, log every transaction as it happens: the gross payment from the buyer, the fees eBay took out, what you paid for the item, shipping costs in and out, and any refunds. Do it in a spreadsheet or accounting app that can produce a categorized profit-and-loss summary at year-end, and back it up with downloaded eBay reports and saved receipts. The reason this matters is simple. The 1099-K eBay sends the IRS reports your gross payments before fees, refunds, or marketplace-collected sales tax come out, so the number is almost always larger than your actual income.1Internal Revenue Service. What to Do With Form 1099-K Your records are what prove the difference.
One boundary worth naming up front: if you’re only selling personal items for less than you paid, you don’t owe income tax on those sales, but you still need records showing the original purchase price. Without them, the IRS sees a sale and no basis.2Internal Revenue Service. Topic No. 409, Capital Gains and Losses The rest of this guide assumes you’re selling at a profit or running a resale business.
What to Record on the Income Side
Gross receipts are the total payments from buyers before any fees or costs come out, and this figure includes shipping charges the buyer paid you. On Schedule C, it goes on Line 1.3Internal Revenue Service. Instructions for Schedule C (Form 1040) For each sale, capture:
- Sale date
- Item description
- Buyer payment amount
- Shipping charged to the buyer
- Sales tax eBay collected (tracked separately)
- Refunds issued, if any
Sales tax that eBay collects as a marketplace facilitator belongs to the state, not to you. It may still appear inside your 1099-K gross total, which is exactly why you need to break it out in your own records. Same with refunds: when you refund a buyer, that reduces your gross sales for the year, and any fees eBay credits back should be reflected too.
Log sales as they occur. Reconstructing months of transactions from memory in April is where sellers lose money to missed refunds and forgotten fees.
What to Record on the Expense Side
Everything you spend to run the selling activity reduces your taxable profit, but only if you have documentation. Credit card statements show that you paid someone; they don’t show what you bought. Save the actual receipt or invoice, including screenshots of digital purchase confirmations.
The categories most eBay sellers deal with:
- Platform fees: listing fees, final value fees, payment processing fees
- Shipping costs: postage, boxes, tape, labels, bubble wrap, and other packaging materials
- Advertising: promoted listing fees and any other paid marketing
- Supplies and software: office supplies, accounting software subscriptions, label printers
- A proportional share of internet and phone service used for the business
Categorize each expense when you enter it. At year-end these categories map directly to the lines on Schedule C, so consistent tagging turns filing into an assembly job.
Inventory and Cost of Goods Sold
If you buy items to resell, their cost is not a regular expense. It’s Cost of Goods Sold, which has its own section on Schedule C (Part III) and is subtracted from gross receipts before operating expenses.4Internal Revenue Service. Schedule C (Form 1040) – Profit or Loss From Business Deducting purchase costs as ordinary expenses instead of tracking them through inventory will distort your profit.
For each item you buy to resell, record:
- Purchase date
- What you paid, including tax and any inbound shipping to get it to you
- Date it sold (once it sells)
The Schedule C formula is: beginning-of-year inventory, plus purchases during the year, minus year-end inventory still on hand. Whatever method you use to value closing inventory, the IRS requires you to apply it consistently year to year.5Internal Revenue Service. Lower of Cost or Market (LCM)
For most eBay sellers, whose stock is unique or varied, specific-item tracking is the most practical approach: you know what you paid for that vintage jacket, and you record that exact cost when it sells. High-volume sellers dealing in identical or interchangeable products sometimes use FIFO, which treats the oldest inventory as the first to sell. Either way, an inventory ledger with purchase costs, dates, and sale dates is essential once you carry stock from one year into the next.
Mileage and Home Office Records
Two deductions have their own logging requirements because the IRS won’t accept reconstructed numbers.
Driving to the post office, thrift stores, estate sales, or supply stores creates deductible business mileage. For 2026 the standard rate is 72.5 cents per mile.6Internal Revenue Service. IRS Sets 2026 Business Standard Mileage Rate at 72.5 Cents Per Mile, Up 2.5 Cents Every trip needs a contemporaneous log entry: date, destination, business purpose, and miles driven. A notes app on your phone works fine as long as you update it each trip.
A home office deduction requires a space used exclusively and regularly for the business. The simplified method pays $5 per square foot up to 300 square feet, capping the deduction at $1,500.7Internal Revenue Service. Simplified Option for Home Office Deduction The regular method calculates the business-use percentage of your home and applies it to actual housing expenses on Form 8829.8Internal Revenue Service. How Small Business Owners Can Deduct Their Home Office From Their Taxes If you plan to use the regular method, track rent or mortgage, utilities, and insurance throughout the year so the calculation is ready in April.
Choosing a Tracking Tool
The right tool depends on volume. Below a couple dozen items a month, a well-organized spreadsheet is enough. Set up columns for date, item description, sale price, shipping collected, platform fees, shipping cost, purchase cost, and net profit. Keep a second tab for non-sale expenses: supplies, mileage, software subscriptions.
Once volume climbs, manual entry becomes a liability. QuickBooks Online, Xero, and similar accounting platforms can pull transactions from your bank and credit card feeds, reducing data entry and catching items you’d otherwise miss. Some e-commerce-specific tools plug into eBay directly and import sales, fees, and refunds automatically.
The test for any system: can it produce a categorized profit-and-loss statement on demand, and does it handle inventory alongside sales? If your COGS ledger lives in a separate file that drifts out of sync with your revenue data, the system isn’t doing its job.
Using eBay Seller Hub Reports
You don’t have to build your dataset from scratch. Seller Hub generates Transaction Reports and monthly Financial Statements that break out gross sales, final value fees, listing fees, promoted listing charges, shipping label costs, and refunds. Download them monthly in spreadsheet format so they can be imported into your accounting system or checked against your own log.
The monthly financial statement doubles as a reconciliation tool. Match it against your bank deposits; if the totals don’t line up, investigate the gap while it’s still fresh. Shipping labels bought through eBay show up as a deductible expense in these reports, kept separate from postage you buy at the post office or through third-party services.
Why Real-Time Tracking Matters for Quarterly Taxes
eBay doesn’t withhold anything from your payments. If your net self-employment earnings hit $400 or more, you owe self-employment tax on top of income tax, and both are due through quarterly estimated payments rather than at filing.9Internal Revenue Service. Topic No. 554, Self-Employment Tax For 2026 those payments fall on April 15, June 15, September 15, and January 15, 2027.10Taxpayer Advocate Service. Making Estimated Tax Payments
To dodge underpayment penalties, you generally need to have paid at least 90 percent of the current year’s tax or 100 percent of last year’s (110 percent if your prior-year AGI was over $150,000).11Office of the Law Revision Counsel. 26 USC 6654 – Failure by Individual to Pay Estimated Income Tax You cannot estimate what you owe each quarter without a running picture of income minus expenses. Waiting until December to tally your year means you’ve already missed three deadlines. This is the practical reason tracking has to be a habit, not a project.
Reconciling Against Your 1099-K
eBay sends a Form 1099-K to you and the IRS if your gross payments exceed $20,000 and you have more than 200 transactions in the year.12Internal Revenue Service. IRS Issues FAQs on Form 1099-K Threshold Under the One, Big, Beautiful Bill; Dollar Limit Reverts to $20,000 Under the threshold, no form arrives, but the tax on any profit is still owed.
Before you file, compare the 1099-K figure to the gross receipts in your records. The 1099-K will usually be higher because it includes marketplace-collected sales tax, refunded transactions, and shipping charges bundled into gross payments. Your records are what document the reconciliation. The IRS matches 1099-K totals against returns automatically, and an unexplained gap is a common reason for a notice.
How Long to Keep the Records
Keep everything supporting income, deductions, and credits until the statute of limitations runs out. For most sellers that’s at least three years from the date the return was filed.13Internal Revenue Service. How Long Should I Keep Records If you claim a bad debt deduction or a loss from worthless securities, retention runs seven years.14Internal Revenue Service. Topic No. 305, Recordkeeping
That means holding onto downloaded eBay reports, expense receipts, bank statements, inventory purchase records, mileage logs, and the 1099-K itself. Digital storage is fine and preferable to paper. Back everything up to a second location: cloud storage, an external drive, or both. The sellers who move through an audit quickly are the ones who can produce any receipt from any month in minutes.