Floor plan financing is a revolving line of credit that pays for your inventory: the lender funds the car at auction, holds the title, and gets paid back — principal, interest, and fees — when the car sells or hits a scheduled paydown date called a curtailment. It's how a dealer with $60,000 in cash keeps $300,000 of inventory on the lot. It is also, per one veteran independent on the DealerRefresh forum, "climbing in bed with the Devil." Both things are true. The difference between a floorplan that grows your lot and one that eats it is whether you track what each floored VIN costs you per day — most dealers don't.
The mechanics in 60 seconds
You're approved for a credit line ($50k–$500k+ for small independents). At auction, you buy on the line: the lender pays the auction, takes the title, and opens a per-unit balance. Interest accrues daily on each unit. When the car retails, you must pay that unit off — typically within a day or two of receiving customer funds. Selling a floored car and not paying the lender is called being sold out of trust, and it's the cardinal sin: lenders treat it as default, and the horror stories start there. Lenders also audit your lot regularly — physically counting floored units — and dealers report audit fees that started at "$80–100 like promised" and became $265.
Who the lenders are
The national independents-focused floorplan companies are NextGear Capital (Cox — same parent as Manheim), AFC (OPENLANE), and Westlake Flooring, plus regional players like Floorplan Xpress and, for established dealers, local banks and credit unions — usually the cheapest money but the least auction integration. The big three are wired directly into the auctions, which is exactly why they're convenient and exactly why losing one hurts: dealers who default report being blocked from the auctions themselves. "They will shut you down and kick you out of all Manheim Auto Auctions," as one NextGear complainant put it.
What it costs: the full stack
| Cost component | Typical range | When it hits |
|---|---|---|
| Interest | Prime + 2% to 7% APR | Accrues daily per unit |
| Floor fee | $50 – $100 per unit | At flooring |
| Curtailment fee | $50 – $250+ per event | Day 30/45/60/90, per lender schedule |
| Audit fees | $80 – $265 per audit | Monthly-ish, dealers report creep |
| Title/processing fees | $10 – $50 per unit | Various |
Industry glossaries put curtailment paydowns at 5%–30% of principal per event, escalating the longer a unit sits. The fees are the part dealers underestimate — one NextGear reviewer described "hundreds upon hundreds of dollars worth of fees every other day or several times a week." Read your fee schedule like a contract lawyer, because it is one.
A worked example: one $12,000 car, 90 days
Say you floor a $12,000 unit at 13% APR (≈ $4.27/day), $100 floor fee, 10% curtailment at day 30 and 60 with a $150 fee each, payoff required at day 90.
Two lessons live in that picture. First, the direct carry (~$750) is 20–30% of a typical front gross on a car like this. Second — and this is the one that kills dealers — curtailments demand cash on the lender's schedule, not yours. A slow month with five units hitting day-30 curtailments is a $7,000 cash call whether or not you sold anything. As one DealerRefresh dealer put it: "When the curtailments come, there is nothing you can do about it."
Audits and "sold out of trust": the two ways relationships die
The lot audit is the lender physically verifying its collateral: an auditor shows up — often unannounced — and matches every floored VIN against a car they can touch. Units out for recon, out on test drives, or parked at your second location need documentation ready, because "not on the lot, no paper" gets written up as missing collateral. A written-up unit typically triggers immediate payoff demands; a pattern triggers line review.
Sold out of trust (SOT) is the unforgivable version: the car sold, the customer paid, and the lender didn't get its payoff inside the contractual window — usually 24–48 hours after you receive funds. Dealers slide into SOT gradually and almost never on purpose: a busy week, a title clerk out sick, customer funds used to cover Friday payroll with every intention of paying Monday. Lenders don't grade intent. SOT findings freeze lines, accelerate balances, and populate the horror stories — "they sent out tow trucks in the middle of the night and repoed all the vehicles," as one complaint put it. The operational fix is boring and absolute: payoffs go out the same day funds land, no exceptions, and your system should show sold-but-unpaid floored units on one screen so nothing ages silently.
Track interest per VIN or fly blind
Floorplan statements arrive as one monthly lump across all floored units, which is why almost nobody allocates it back to cars — a dealer asked on DealerRefresh whether anyone actually tracks floorplan interest per VIN and got zero replies. But the per-unit number is the one that matters: it tells you which cars to reprice, which to wholesale out before the next curtailment, and what your true gross was after the fact. Combined with the other daily holding costs (insurance, lot, depreciation — industry estimates run $32–$48/unit/day all-in), a unit crossing 60 days has quietly shed a quarter or more of its expected gross. The fix is mechanical: accrue daily interest per unit and reconcile against the lender statement — Loturn does this automatically per VIN, so "this car goes cash-negative in 9 days" is a warning on screen, not a post-mortem. The full framework is in how to calculate true per-car profit.
When NOT to floor a car
- Cheap cash cars. A $4,000 unit's flooring fees are a huge percentage of its gross. Most sub-$5k inventory should be cash-bought.
- Slow movers. If a segment turns in 70 days on your lot, flooring it means two curtailments and ~$700+ of carry per unit — before markdowns.
- When your turn is already slipping. Flooring more inventory to fix a slow lot compounds the problem; the curtailment calendar fills up faster than the sales board.
- When the line is your only cash buffer. Dealers report lines being cut or closed abruptly — "they have decided to close my account no notice no nothing saying I have 30 days to pay the $50000." If a closed line would kill you in 30 days, you're over-floored.
Choosing a lender: the factors that actually differ
Compare on: interest rate and the full fee schedule (fees often exceed interest), curtailment timing and percentages, audit frequency and cost, title handling speed (a lender sitting on titles freezes your auction selling), how the line grows with your history, and what dealers in your market say about workouts when a month goes sideways. The rate is the headline; the curtailment schedule is the contract.
A floorplan is leverage, and leverage is a tool. Use it on inventory that turns, track it to the penny per VIN, keep a cash buffer for the curtailment calendar — and it funds a lot you couldn't otherwise run. Skip the tracking, and you'll learn the numbers from the lender's statement, which is always the expensive way.