Most failed flips fail at one moment: the purchase. The resale value was fine, the item sold, the shipping worked — you just paid too much going in, so there was never any profit to capture. The fix is knowing, before you message the seller, the most you can pay and still make money. That number is your max-buy price, and here's how to work it out.
Work backward from the real resale price
Your max-buy isn't a gut feeling — it's arithmetic, starting from what the item actually sells for (recent sold comps, not hopeful asking prices — see how to price used items to resell). Then subtract everything between you and the profit:
- Selling fees — the marketplace's cut (see understanding marketplace fees).
- Shipping, if you'll ship it.
- Cleaning / repair to get it sale-ready.
- Transport — the drive to pick it up.
- Your target profit — what makes it worth doing at all.
What's left is the ceiling. Resale $200, minus $30 fees, $10 cleaning, $10 drive, and a $50 target profit = a $100 max-buy. Pay more than that and you're eating your own profit.
Price the uncertainty in
You can't fully inspect most listings, so build a cushion for what you can't see. If condition, completeness, or authenticity is unclear, assume the worse case and lower your ceiling — "unknown" should reduce what you'll pay, never get optimistically rounded up. It's the same principle as avoiding overpaying.
Decide the number BEFORE you negotiate
The whole point of a max-buy is that it's set before emotion enters. Once you're in a back-and-forth, "just $10 more" happens three times and suddenly you're over your ceiling. Decide the number cold, and walk when the price passes it — there's always another deal. This is the buyer's-side discipline behind handling any negotiation.
Your skills change the number
Here's a subtlety most people miss: the repair cost in that formula is yours, not a generic shop rate. If you can fix a wooden joint yourself, the repair line is glue and ten minutes, not $75 — which raises your max-buy and makes deals other people pass on worth it for you. Worth Radar actually accounts for this: tell it what you can fix and the max-buy reflects your real cost.
Let the math be computed for you
Doing this by hand for every listing is slow, which is why people skip it and overpay. Worth Radar computes a max-buy price for every deal automatically — resale from real sold comps, minus all the costs, adjusted for your skills — so you walk into every negotiation already knowing your ceiling. Try it free.