Reseller Bookkeeping and Taxes: A Practical Setup Guide
Reseller Tips · 2026-08-20 · 6 min read · FlipScout Team
Most resellers do not have a profit problem. They have a record-keeping problem that looks like a profit problem in February, when a platform statement lands and nobody can prove what the inventory cost.
Here is the opinionated version: your bookkeeping only needs to answer four questions — what did I pay for it, what did I sell it for, what did the platform and carrier take, and how far did I drive to get it. If your system answers those four every week, tax season is an afternoon. If it does not, no app will save you.
This is a workflow guide, not tax advice. Rules change and your situation is specific — anything below that touches your return should be confirmed with a CPA or enrolled agent who has seen reseller books before.
The four numbers that actually matter
Everything else is decoration. Track these per item, at the moment they happen:
| Number | When you record it | Where it lands at tax time |
|---|---|---|
| Cost of the item (COGS) | The day you buy it | Cost of goods sold |
| Gross sale price | The day it sells | Gross receipts |
| Platform + processing fees | The day it sells | Commissions / fees |
| Shipping labels and supplies | When purchased | Shipping expense |
Add mileage as a fifth line that lives in a separate log, because it is claimed on a rate, not a receipt.
The trap is the gross sale price. Platform payout reports show what hit your bank; information returns show gross, before fees, refunds and shipping. Those two numbers are never the same, and the gap is exactly why you need your own records.
What the 1099-K threshold actually is right now
The federal reporting threshold has whipsawed for four years, and half the advice online still quotes a dead number. As of the current IRS guidance: a third-party settlement organization (eBay, Mercari, PayPal, Whatnot and friends) is not required to file a Form 1099-K for you unless your gross payments exceed $20,000 and you have more than 200 transactions in the year. The One, Big, Beautiful Bill retroactively reinstated that pre-2021 threshold, killing the $600 rule that never fully took effect.
Two things resellers get wrong about this:
- Your state may be lower. Several states require the form at far smaller amounts, and platforms comply. Getting a 1099-K you did not expect is normal; it does not mean you did something wrong.
- No form does not mean no tax. Income is income whether or not a piece of paper reports it. The threshold governs the platform's filing duty, not your reporting duty.
Reconcile, don't panic. If a 1099-K shows $22,000 and you actually netted $6,000, that is not an error. Box 1a is gross — before fees, refunds, and shipping the buyer paid. Your books are what turn that number into reality, which is why "I'll figure it out later" is the most expensive sentence in reselling.
The 20-minute-a-week system
You do not need accounting software on day one. You need one spreadsheet with one row per item and columns for: SKU, source, date bought, cost, date listed, list price, date sold, platform, gross sale, fees, shipping label, and net. Add the row when you buy, finish the row when it sells.
Three rules make it survive contact with reality:
- Photograph every receipt at the source. Garage sales and estate sales give you nothing. Snap a photo of the pile with the cash amount written on a sticky note, or log it in your phone before you drive away. Untracked cash sourcing is the single biggest hole in most reseller books.
- One bank account and one card for the business. Not for legal reasons — for reconstruction reasons. When your memory fails in January, the statement is the backup copy of your year.
- Never delete a sold listing before it is recorded. Platforms purge sold data on their own schedule. Our guide to eBay sold comps is about pricing, but the same lesson applies: sold data disappears faster than you think.
COGS: the part people get wrong
Cost of goods sold is not "what I spent on inventory this year." It is what you spent on the items that sold this year. A $400 pallet that produced $150 of sales in December does not deduct as $400 in December — the unsold portion is still inventory.
That means lot purchases need an allocation. Two defensible methods for a small operation:
| Method | How it works | Best for |
|---|---|---|
| Per-item split | Divide lot cost evenly across usable items | Uniform lots (a box of 20 similar shirts) |
| Value-weighted split | Allocate cost in proportion to expected sale price | Mixed lots with one or two hero items |
Pick one and stay with it. Consistency matters more than which one you choose, and switching methods mid-year is how you end up with books nobody can audit — including you. Note that some small businesses can elect simplified inventory treatment under the small-business taxpayer rules; whether you qualify and whether it helps is a genuine CPA question, not a blog question.
Mileage is the deduction resellers leave on the table
Sourcing runs are miles. Post office trips are miles. Storage unit runs are miles. Under the IRS standard mileage rate, business miles in 2026 are deductible at 72.5 cents per mile for January 1 through June 30 and 76 cents per mile for July 1 through December 31 (it was 70 cents for all of 2025). Two rates in one year means your log needs dates, not just totals.
Do the math on a normal Saturday: an 18-mile thrift loop plus a 6-mile post office run is 24 miles. At 76 cents that is $18.24. Forty Saturdays is roughly $730 of deduction you either recorded or did not.
A valid log needs the date, the mileage, and the business purpose. An app that runs in the background is fine; a note in your phone is fine. A December reconstruction from memory is not fine.
Also worth knowing: if you use part of your home regularly and exclusively for the business — including storing inventory — there is a simplified home office option of $5 per square foot up to 300 square feet. The "exclusively" word does real work there, so get it checked.
Hobby or business — and why it matters
If reselling is a business, expenses offset income. If the IRS considers it a hobby, the treatment is much worse. The test is facts and circumstances: do you run it in a businesslike manner with complete books, do you depend on the income, do you change tactics to improve profitability, do you have a history of profit?
Notice the first item on that list. Keeping good books is itself evidence that you are running a business. The spreadsheet is not just admin; it is the argument.
What to hand your CPA
Show up in January with these five artifacts and you will pay for an hour of advice instead of five hours of cleanup:
- Your item-level spreadsheet, with a totals row.
- Every 1099-K you received, plus each platform's annual fee/sales report.
- Your mileage log, split by rate period.
- Bank and card statements for the business account.
- An inventory count at December 31 — units and cost.
That last one is the one nobody has, and it is the one that determines your COGS. Count it while the year is still fresh.
The honest summary
Bookkeeping does not make you money, but bad bookkeeping quietly gives it away — in missed mileage, in unrecorded cash sourcing, in a 1099-K you cannot reconcile, and in the deductions you skip because you cannot prove them. Twenty minutes a week beats a lost weekend in April every single time.
If you want the sourcing side of the equation to be as tight as the accounting side, FlipScout tells you what an item is worth before you buy it — so the numbers you are tracking are worth tracking in the first place.