The short version: a 60 dollar sale is not 60 dollars of profit. Between the 12 dollars the jacket cost at the thrift store, platform fees, shipping supplies, and the drive across town to source it, many flips earn half what the seller thinks. Resellers who track cost per item and keep every sourcing receipt know their real margin, pay the right tax, and stop restocking the wrong inventory.

The number that matters: profit per flip

For each item: sale price, minus what you paid for it, minus selling fees, minus shipping you covered, minus a fair share of supplies. Everything in that formula except the sale price is an expense you must have recorded somewhere. That is the entire discipline of reseller bookkeeping: capture costs at the moment they happen, so the subtraction is possible later.

Sourcing receipts: the haul problem

Thrift stores hand you one thermal receipt for a 14-item haul, and thermal paper fades within months. Scan it in the parking lot; True Cost captures the line items, date and store while the ink still exists. If your buys come from garage sales or markets with no receipts at all, create the record yourself on the spot: a photo of the items and a note of what you paid, where, and when. A self-made record beats no record everywhere that matters, from your own margin maths to a tax review.

The costs resellers forget to count

  • Platform and payment fees. Marketplace commissions and processing fees come out before the money reaches you; track them per month even if you cannot per item.
  • Shipping supplies. Boxes, poly mailers, tape, label paper. One supplies category, receipts scanned, reviewed monthly.
  • Mileage. Sourcing routes, post office runs. Where your tax rules allow a per-kilometre or per-mile rate, the habit of noting trips pays real money.
  • Cleaning and repair. Detergent, lint shavers, replacement buttons, cobbler visits for shoes worth the rescue.
  • Storage. Racks, bins, and rented space once the spare room overflows.

A lightweight system that scales with your rack

  • Per haul: scan the sourcing receipt (or make the record) before driving home. Everything else builds on this.
  • Per listing: note what the item cost you when you list it. Most resellers keep a simple spreadsheet of item, source, cost, list date, sale date, sale price; the receipts behind it live in the scanner app.
  • Per month: total fees, supplies and mileage, and read your true profit. Compare it to hours spent; the answer sometimes changes what you source.

Taxes without the panic

Marketplaces in many countries now report seller income to tax authorities, so the question is not whether your sales are visible; it is whether your costs are documented. A reseller with sourcing receipts, fee statements and a mileage log deducts all of it and pays tax on real profit. A reseller with nothing pays tax on revenue. Same sales, very different bill. Keep records from your first flip and the hobby-versus-business question (which our side hustle guide covers) becomes paperwork rather than drama.

Restock what actually earns

The bookkeeping pays off beyond April: once you know profit per flip by category, you discover that jackets earn triple what dresses do for the same effort, or that the premium thrift store beats the cheap one after fees. Your sourcing gets sharper because your data is real.

Start with your next haul: download True Cost, scan the receipt before you leave the lot, and know your real margin by the end of the month.