Dealers who flip private-party cars ask how far below retail they should buy. The answer is a sum, not a percentage. Your costs are dollars. A $6,000 car and a $30,000 car can need the same set of tires, and they can sit on your lot just as long. A rule like "buy at a set share of retail" leaves too little room on cheap cars and loses you deals on expensive ones.
Working backward fixes that. You set the exit price first and take out each cost, and what remains is your maximum buy. You walk into the call knowing the number, and you don't move it at the car because you already drove there.
Start with the retail sale, not the retail ask
Pull retail comps for the car the ad describes. A comp that counts has the same year, the same trim, miles within a band close to this car's, and a clean title if this car claims one. Look in your own market and at the price range your lot sells in.
Dealer listings are asks. Kelley Blue Book's Typical Listing Price definition, read September 29, 2026, says the final sale price will likely be less than the dealer's ask. Your own sold history is the best comp you have. If you usually close under your sticker, take that gap off the comps too. Pick the price you expect to sell at, not the highest ask you found.
Check how long the comps have been listed. A comp that has sat for two months is likely priced above what buyers will pay. Drop it or weight it low.
Expected days to sell
Estimate how long this car will take to sell on your lot. Use your own turn on similar cars, not the market's. Each day adds holding cost, and a car that sits longer is more likely to need a price cut before it sells. A car that turns in 30 days and one that takes 90 are different buys at the same retail price.
Take out reconditioning
List what the car needs to be front-line ready, and price each item at your own shop's or vendor's rate. The common ones are tires, brakes, a detail, dent and paint work, a windshield, a missing key and any repair your state's inspection or emissions test will require.
Before you see the car, the ad is your only source. Everything in it is what the seller says. A seller who writes "no issues" may believe it. A seller who writes "check engine light on" has told you something useful, so price the likely repair before you call.
A reserve for surprises
Some problems only show after you own the car: a code that comes back a week after it was cleared, a transmission that slips when it's hot, a leak the seller washed off. Hold back a reserve on every buy. Set it from your own history, higher for older cars and higher miles. If you skip the reserve, your good buys end up paying for your bad ones.
Take out getting it home and titled
Count the trip to the car, your time or a porter's, and transport if it won't drive. Count the title and transfer costs your state charges a dealer, and any inspection or emissions certificate you will owe your retail buyer. These vary by state. California's DMV lists its transfer requirements on its change of ownership page, and your own state's DMV or dealer licensing agency has the rules that apply to you.
Add a vehicle history report on the VIN. It is cheap next to buying a car with a title brand the seller didn't mention.
Take out holding cost
If you floor the car, holding cost is the floorplan interest and fees for the days you expect to hold it. The interest is the amount you floor, times your annual rate, times the days held, divided by 365. Add any per-unit or curtailment fees your lender charges. If you pay cash, the same money earns nothing while the car sits, so use the rate your cash would earn elsewhere or the rate you'd pay to borrow it.
Some dealers add a per-day cost for the lot space, insurance and the car's share of overhead. If you track that, use it.
Take out selling costs and your gross
Selling costs are what you spend per car to sell it: listing sites, photos, a salesperson's commission and any warranty cost you absorb. Then take out your target gross. That is your number, set by how you run your store. VinCount has no view on it.
The formula
Your maximum buy price is the expected retail sale, minus each of these:
- Reconditioning you can see or expect from the ad
- A reserve for what you can't see yet
- Pickup or transport
- Title, transfer, history report and any inspection you will owe
- Holding cost for the days you expect to hold it
- Selling costs
- Your target gross
Worked example, made-up numbers
Every figure here is invented and rounded to show the method. None of it is market data. The car is a ten-year-old midsize sedan with 95,000 miles, and the ad says it has a clean title.
Comps with the same trim and 80,000 to 110,000 miles list at $15,000 to $16,000 at dealers near you. Your history says you close about $1,000 under the ask, so you expect to sell at $14,500 in about 45 days.
| Line | Amount |
|---|---|
| Expected retail sale | $14,500 |
| Recon: tires, brakes, detail | -$1,100 |
| Reserve for surprises | -$500 |
| Pickup | -$100 |
| Title, history report, inspection | -$150 |
| Floorplan interest and fees, 45 days | -$200 |
| Selling costs | -$400 |
| Target gross | -$2,000 |
| Maximum buy | $10,050 |
The seller asks $11,500. The ad has been up 18 days, the ask was cut once from $12,500, and it says OBO. You open near $9,000 and stop at $10,000. If the seller won't come down that far, you pass and move to the next car.
Check the answer against wholesale
Two auction numbers check the result. The first is what the same car would cost you at auction, with the buy fee and transport added. If the seller's ask is above that, you can buy the car at auction for less, usually with arbitration behind it. The second is what you would get if you had to wholesale it out, roughly MMR less the sell fee and the trip. The distance between your buy price and that floor is what you stand to lose if the car doesn't retail.
MMR vs private-party price covers how to read an ask against the auction number, including a thin MMR sample and a trim that doesn't match.
Making the offer
You have the maximum before you call. The ask's history shapes where you open. A car listed three weeks with two cuts has a seller who is listening. A car posted this morning at a fair ask may sell today, so a lowball can lose it. Use the private-party buying checklist for the call and the inspection, and lower your maximum for anything the car shows you that the ad didn't.
Don't raise the number at the car. The drive and the hour you spent are gone either way. If the car only works above your maximum, let another dealer buy it.
Where VinCount fits
VinCount never suggests an offer, a value or a profit. It shows you the ask, how the ask has moved, how long the car has been listed and what the ad claims, for private-party cars in Los Angeles on Craigslist, Facebook Marketplace and OfferUp. VinCount is adding auction and retail comps with the count of sales or listings behind each, so the retail comps and the wholesale check start from prices VinCount observed. The rest of the math is yours, because only you know your recon costs, your turn and your floorplan. How it works shows each column on the sheet.