Free Tool February 2026

Floor Plan Interest Calculator

See the true cost of holding inventory. Calculate daily interest, flooring fees, and real vehicle cost instantly.

Use Calculator How It Works
$
$
%
days

Your Floor Plan Costs

Daily Interest $2.63
Total Interest (45 days) $118.36
Flooring Fee $75.00
True Vehicle Cost $8,193.36

Track floor plan costs automatically for every car

Try FoxDMS Free →

How to Calculate Floor Plan Interest

Floor plan financing lets dealers purchase inventory without tying up capital, but it comes with costs that eat into your profit on every vehicle. Understanding these costs is crucial for making smart buying decisions.

The Floor Plan Interest Formula

Calculating floor plan interest is straightforward:

Daily Interest = (Vehicle Cost × APR) ÷ 365

Then multiply by the number of days you hold the vehicle:

Total Interest = Daily Interest × Days Held

What's Included in True Vehicle Cost?

The true cost of a floored vehicle includes more than just the purchase price:

  • Purchase Price — What you paid for the vehicle
  • Flooring Fee — One-time fee when the vehicle is floored (typically $50-$150)
  • Floor Plan Interest — Daily interest that accrues while you hold the vehicle

Example Calculation

  • Purchase Price: $8,000
  • Flooring Fee: $75
  • APR: 12%
  • Days Held: 45
  • Daily Interest: $8,000 × 0.12 ÷ 365 = $2.63/day
  • Total Interest: $2.63 × 45 = $118.36
  • True Vehicle Cost: $8,000 + $75 + $118.36 = $8,193.36

Why This Matters for Your Profit

Many dealers only look at purchase price when calculating profit. But if you bought a car for $8,000 and sold it for $9,000, your actual profit isn't $1,000 — it's $1,000 minus floor plan costs.

In the example above, floor plan costs are $193.36. That's almost 20% of your "profit" gone before you account for transport, reconditioning, or any other expenses.

The longer you hold inventory, the more floor plan interest compounds. A vehicle sitting for 90 days costs twice as much in interest as one sold in 45 days.

Stop Calculating Manually

FoxDMS automatically tracks floor plan interest for every vehicle in your inventory.

Start Free Trial →

Frequently Asked Questions

How do you calculate floor plan interest?
Floor plan interest is calculated using this formula: Daily Interest = (Vehicle Cost × APR) ÷ 365. For example, an $8,000 vehicle at 12% APR costs $2.63 per day in interest. Multiply daily interest by the number of days you hold the vehicle to get total interest cost.
What is the average floor plan interest rate for car dealers?
Floor plan interest rates typically range from 7% to 15% APR depending on the lender, your credit, and market conditions. As of 2026, most dealers see rates between 9% and 12% APR. Providers like NextGear Capital, AFC, and Kinetic Advantage all have different rate structures.
What is a flooring fee?
A flooring fee is a one-time charge when you floor (finance) a vehicle through your floor plan provider. This fee typically ranges from $50 to $150 per vehicle and is charged when the vehicle is added to your floor plan, regardless of how long you hold it.
How much does floor plan cost per day?
Floor plan cost per day depends on the vehicle value and your interest rate. At 12% APR, every $1,000 of vehicle value costs about $0.33 per day. A $10,000 vehicle costs $3.29 per day, a $15,000 vehicle costs $4.93 per day, and a $20,000 vehicle costs $6.58 per day in interest alone.
What is the true cost of a floored vehicle?
The true cost of a floored vehicle = Purchase Price + Flooring Fee + Total Interest. For example, an $8,000 vehicle with a $75 flooring fee held for 45 days at 12% APR has a true cost of $8,193.36. Many dealers only look at purchase price and miss $100-300 in hidden floor plan costs per vehicle.

Stop Guessing, Start Knowing

FoxDMS automatically tracks floor plan interest, flooring fees, and every other cost for each vehicle — so you always know your true profit.

Start Free Trial →