The Floor Plan Math
At 9% floor plan interest with a 60-day turn, you're paying roughly $450 in interest on a $30,000 car. If your gross profit is $2,000, that's 22% of your profit gone before you sell it. At 90 days, it's 34%. The question isn't whether you can afford floor plan—it's whether your turn rate justifies it.
Every small dealer knows the feeling: You want to grow. You know you could sell more cars if you just had more inventory. The math seems simple—more cars equals more sales equals more profit. So you get a floor plan line.
Six months later, you're selling more cars than ever. But somehow, you have less cash in the bank than when you started. The interest payments are relentless. You're working harder, stressing more, and your profit margin has actually shrunk.
Welcome to the floor plan trap. It's one of the most common—and least discussed—problems facing independent dealers. And once you're in it, getting out feels almost impossible.
Let me show you exactly how this happens, why it happens, and how to break free.
The Vicious Cycle Nobody Warns You About
Here's how the trap typically develops:
- You start with limited cash and limited inventory
- Sales are slow because selection is limited
- You get floor plan financing to buy more cars
- Inventory grows, sales increase (victory!)
- But interest costs are eating into every deal
- You need to sell faster to cover interest, so you discount
- Margins shrink, cash flow stays tight
- You can't pay down the floor plan, so you stay leveraged
- Interest keeps accumulating, pressure keeps building
- Repeat indefinitely
The cruel irony: the floor plan that was supposed to help you build cash is actually preventing you from building cash. You're on a treadmill, running faster and going nowhere.
The Hidden Truth
The Math That Changes Everything
Let's get specific. Here's what floor plan actually costs at different turn rates:
Floor Plan Cost by Turn Rate (9% APR, $25,000 car)
| Days to Sell | Interest Paid | % of $2,500 Gross | True Net Profit |
|---|---|---|---|
| 30 days | $185 | 7.4% | $2,315 |
| 45 days | $278 | 11.1% | $2,222 |
| 60 days | $370 | 14.8% | $2,130 |
| 75 days | $463 | 18.5% | $2,037 |
| 90 days | $555 | 22.2% | $1,945 |
| 120 days | $740 | 29.6% | $1,760 |
Now multiply that across your entire inventory. If you have 20 cars on floor plan averaging 60 days to sell, you're paying $7,400/month in interest alone. That's $88,800 per year—money that could be cash in your bank.
The Break-Even Question
Here's the question most dealers never ask: "Does the additional inventory from floor plan generate enough extra profit to cover the interest AND build cash?"
Let's say floor plan lets you stock 15 extra cars. If those cars average $2,000 gross profit and you turn them once every 60 days (6 turns per year), that's:
- 15 cars × 6 turns × $2,000 gross = $180,000 gross profit
- Floor plan interest: 15 cars × $25,000 avg × 9% = $33,750/year
- Net benefit: $180,000 - $33,750 = $146,250
Sounds good, right? But here's where it falls apart:
- That assumes you actually achieve 60-day turns (industry average is higher)
- That assumes your gross profit stays at $2,000 (it often compresses with more inventory)
- That ignores the other holding costs (insurance, lot space, opportunity cost)
- That assumes you don't discount to move aged units
- That assumes no reconditioning surprises on floor plan cars
In reality, many dealers using floor plan are barely breaking even on the extra inventory—or actually losing money once you account for all the hidden costs.
Signs You're Stuck in the Floor Plan Trap
How do you know if floor plan is helping or hurting? Look for these warning signs:
- Your floor plan balance never seems to go down significantly
- You're discounting cars heavily after 60-90 days to avoid more interest
- Your gross profit per car has decreased since getting floor plan
- You feel pressure to buy at auction even when deals aren't great
- Cash in the bank isn't growing despite selling more cars
- You're paying minimum payments, rolling interest forward
- Aged inventory (90+ days) makes up more than 15% of your lot
- You can't imagine operating without floor plan anymore
The Ultimate Test
Know Your Real Numbers
Our Profit Dashboard tracks true profit per car including holding costs, floor plan interest, and reconditioning. See which cars make money and which ones drain it.
The Alternative: The Cash-First Model
There's another way to think about inventory. Instead of "more cars = more sales," consider: "faster turns = more sales with less capital."
The Power of Turn Rate
Let's compare two dealers:
Dealer A vs. Dealer B: One Year
| Metric | Dealer A (Floor Plan) | Dealer B (Cash) |
|---|---|---|
| Inventory | 30 cars | 12 cars |
| Capital tied up | $450,000 (borrowed) | $180,000 (owned) |
| Average days to sell | 75 days | 35 days |
| Annual turns | 4.9x | 10.4x |
| Cars sold/year | 147 | 125 |
| Gross profit @ $2,000 | $294,000 | $250,000 |
| Floor plan interest | $40,500 | $0 |
| Net profit | $253,500 | $250,000 |
| Cash build possible? | Minimal | Significant |
Dealer A sold 22 more cars but made roughly the same profit—and has no cash to show for it. Dealer B sold fewer cars, made similar money, and is building a cash reserve every month.
Three years later, Dealer B has $100,000+ in cash reserves. Dealer A is still on the floor plan treadmill.
How to Turn Inventory Faster
If fewer, faster-turning cars is the goal, here's how to achieve it:
- Buy right: Only acquire cars you're confident will sell in 45 days
- Price aggressively from day one: Don't price high and reduce—price to sell immediately
- Market every car: Professional photos, detailed descriptions, multiple platforms
- Respond instantly: Speed-to-lead matters even more with smaller inventory
- Be ruthless at 45 days: If it hasn't sold, cut the price significantly
- Wholesale at 60 days: Don't let aged inventory drag down your average
- Track obsessively: Know your turn rate by category, price point, and source
The 45-Day Rule
Breaking Free: From Floor Plan to Cash Flow
If you're already on floor plan and want to transition to cash, here's a realistic path:
Phase 1: Stabilize (Months 1-3)
- Stop buying on floor plan unless it's a guaranteed quick flip
- Focus on selling existing floor plan inventory—even at reduced margins
- Set up true profit tracking including all holding costs
- Identify your actual turn rate by car type
- Build a small cash buffer ($10-20K) before anything else
Phase 2: Reduce (Months 4-8)
- Every sale, use 50% of gross profit to pay down floor plan principal
- Reduce floor plan inventory by 2-3 cars per month
- Buy replacement inventory with cash only
- Focus on faster-turning cars (even if gross is slightly lower)
- Watch your cash position grow
Phase 3: Transition (Months 9-18)
- Continue paying down floor plan with each sale
- Build cash inventory as floor plan decreases
- Target: 50% cash inventory within 12 months
- Target: 100% cash inventory within 18-24 months
- Keep floor plan line open for opportunistic buys, but use sparingly
"The goal isn't to eliminate floor plan forever—it's to use it strategically rather than depending on it. The dealer who CAN operate without floor plan but CHOOSES to use it selectively has all the power."
— The mindset shift that changes everything
When Floor Plan Actually Makes Sense
I'm not saying floor plan is always bad. It makes sense when:
- You have a proven sub-30-day turn rate and want to scale
- You're using it for a specific seasonal opportunity (tax season inventory)
- You're buying a guaranteed quick-flip (customer waiting, auction deal)
- Your cash reserves are healthy and you're using floor plan to preserve liquidity
- You've done the math and interest costs are clearly justified by incremental profit
The key difference: using floor plan as a tool versus depending on it for survival. One is strategic; the other is a trap.
The Hybrid Approach
Many successful small dealers use a hybrid model:
- 60-70% of inventory owned in cash (core stock)
- 30-40% on floor plan (opportunistic buys, seasonal expansion)
- Floor plan reserved for cars with proven fast turn rates
- Strict 45-day payoff rule on any floor plan car
- Cash reserves equal to at least 2 months of operating expenses
This gives you the flexibility of floor plan without the dependency.
The Numbers You Need to Track
You can't escape the trap if you don't know you're in it. Track these weekly:
- True profit per car (including all holding costs and floor plan interest)
- Average days to sell (overall and by car type)
- Floor plan balance trend (is it going down?)
- Cash position trend (is it going up?)
- Aged inventory percentage (target: under 10% over 60 days)
- Interest paid this month vs. last month
- Gross profit per dollar of inventory investment
Tools for Financial Clarity
The Bottom Line
Floor plan financing isn't inherently good or bad—it's a tool. But like any tool, it can build you up or tear you down depending on how you use it.
Too many small dealers accept floor plan dependency as "just how it works." They believe the cycle is inescapable. It's not. The dealers who break free don't do it by selling more cars—they do it by turning inventory faster and building cash systematically.
It takes discipline. It means saying no to auction cars that seem like good deals but won't turn quickly. It means aggressive pricing and even more aggressive wholesale decisions. It means tracking numbers that most dealers ignore.
But the reward is freedom: the freedom to survive slow months, the freedom to pounce on great opportunities, the freedom to grow on your terms instead of your floor plan company's terms.
That freedom is worth the discipline.
Your Action Item
This week, calculate your actual floor plan cost per car sold over the last 90 days. Take your total interest paid and divide by cars sold. If that number is more than 10% of your average gross profit, you're leaving significant money on the table—and it's time to reconsider your strategy.





