Aged inventory is draining cash before your team pays for recon, advertising, payroll or another price reduction. Here is the math your daily inventory report should show.
I opened our floorplan statement and saw a number nobody in the used-car department wanted to explain.
$18,400 in interest for one month.
We had 87 units averaging 67 days in inventory. Interest and avoidable aging costs were draining about $412 a day before rent, payroll, recon or advertising entered the calculation.
We kept saying we were holding for gross. The statement showed what we were holding: expensive cars with shrinking margins.
After we cut average age from 67 days to 31, monthly floorplan interest fell to $6,200.
Floorplan rates remain expensive in 2026. SOFR was 3.66% on August 25, 2026, before the lender spread and fees in a dealer’s agreement. An 8.5% total floorplan rate is realistic for some stores. Check your statement before using the examples below.
These six floorplan and interest rate business trends are costing some 100-unit operations about $400 a day.
The $400-a-Day Floorplan Leak
| # | Floorplan Trend | Cost Per Day Per 100 Units | Average Days Added | What the Dealer Does Wrong | Fix |
| 1 | 60-plus-day units carry 2.3 times the interest | $187 | 24 days | Holds for hoped-for gross | Price to market on day one |
| 2 | Vehicle sits $1,200 above market | $142 | 18 days | Protects a $2,000 gross target | Set a competitive opening price |
| 3 | Same floorplan lender for three years | $89 | None | Accepts 8.5% without shopping | Get three quotes in Q1 |
| 4 | Wholesale loss aversion | $124 | 21 days | Holds a known loser | Use a 45-day exit rule |
| 5 | New inventory ages past assistance period | $156 | 12 days | Orders beyond sales pace | Reduce orders by 20% |
| 6 | Slow $200 price reductions | $98 | 14 days | Makes changes buyers barely notice | Make a meaningful day-30 move |
Costs shown are modeled estimates based on the 87-unit inventory review used for this article. Results depend on average vehicle cost, rate, turn, curtailments and lender terms.
#1: A 60-Plus-Day Unit Carries 2.3 Times More Interest
Start with one $25,000 used vehicle at an 8.5% annual floorplan rate.
Daily Interest
$25,000 × 8.5% ÷ 365 = $5.82 per day
At 67 days:
$5.82 × 67 = $389.94
At 31 days:
$5.82 × 31 = $180.42
Interest difference per vehicle:
$389.94 − $180.42 = $209.52
Across 87 comparable inventory cycles:
$209.52 × 87 = $18,228.24
That $18,228 represents the interest difference across one complete turn cycle. Monthly savings depend on sales volume, payoff timing, average principal and manufacturer assistance.
The bigger point sits on your aged-inventory report. A unit held for 67 days carries about 2.16 times the interest of a unit sold after 31 days.
Interest also misses several aging expenses:
- Additional markdowns
- Battery replacements
- Repeat detail work
- Lot damage
- Extra advertising
- Falling wholesale value
- Staff time spent defending the unit
Your accounting statement shows the interest. The other losses hide inside used-car gross.
Action: Run the 60-plus-day report every morning. No unit crosses 60 days without written approval from the Owner or GM.
#2: Pricing $1,200 Above Market Adds 18 Days
Your Used Car Manager wants a $2,000 front-end gross.
The vehicle enters the market $1,200 above comparable listings. Management waits for a buyer who accepts the asking price. Leads stay weak, VDP activity drops and the car reaches day 30 without a serious appointment.
The store says it is protecting gross.
The asking price is the only number being protected.
Measure Gross Per Day
Use this formula:
Gross per day = Front-end gross ÷ Days in inventory
A $2,000 front gross after 67 days produces:
$2,000 ÷ 67 = $29.85 per inventory day
A $1,200 front gross after 31 days produces:
$1,200 ÷ 31 = $38.71 per inventory day
The second deal shows a smaller gross per copy. It produces more gross for each day the store’s cash stays tied up.
A faster turn also lets the same parking space produce another sale. Gross per copy misses that opportunity.
Pricing 3% below market does not fit every vehicle. Rare trims, scarce models and exceptional condition deserve separate treatment. A common crossover surrounded by 40 similar listings does not.
Action: Set your market position before the listing goes live. Do not wait until day 30 to admit the opening price failed.
#3: Your Three-Year Floorplan Relationship Might Cost $88 a Day
Used Car Managers negotiate auction purchases down to the last $100. Many stores accept the same floorplan terms year after year.
Run the rate-spread math on a $2 million average balance.
Current floorplan rate:
8.5%
Competing quote:
6.9%
Rate difference:
1.6 percentage points
Annual cost difference:
$2,000,000 × 1.6% = $32,000
Daily cost difference:
$32,000 ÷ 365 = $87.67
That is almost $88 a day from one contract comparison.
The 6.9% rate is an example, not a market-wide offer. Your rate depends on credit strength, collateral, average balance, audit history and lender relationship.
Compare the full agreement, including:
- Base rate and lender spread
- Curtailment schedule
- Audit fees
- Unused-line fees
- Payoff timing
- Personal guarantees
- Manufacturer assistance
- Covenant requirements
A lower headline rate paired with aggressive curtailments might hurt cash flow. Put every proposal into the same annual-cost model.
Action: Request three written floorplan proposals during Q1. Give your current lender a chance to match the strongest total package.
#4: Wholesale Loss Aversion Turns a $2,000 Loss Into $2,122
You own a vehicle for $24,000.
Current wholesale value is $22,000.
The store refuses to take the $2,000 loss, so management holds the vehicle for another 21 days.
Using the same $5.82 daily interest cost:
$5.82 × 21 days = $122.22
The store still has the original $2,000 wholesale loss. Waiting raises the direct loss to at least $2,122.
That figure excludes another market decline, auction fees, transportation and repairs.
The additional interest bought 21 more days of exposure. It did not improve the vehicle.
Set an exit plan when you acquire each unit. Do not create the plan after the car reaches day 60.
At day 30, review price position and lead activity. At day 45, decide whether the vehicle earned more retail time. Require Owner approval for every day-60 exception.
Each exception should include:
- Acquisition cost
- Current retail price
- Market ranking
- Wholesale value
- VDP views
- Leads and appointments
- Interest paid
- Expected gross after the next reduction
Action: Use a 45-day wholesale decision. Keep the original purchase price out of the next decision.
#5: New Inventory Past the Assistance Period Costs $6,900 a Month
Owners often review new-car flooring and used-car flooring in separate meetings.
Put both statements on the same desk.
Assume 40 new units remain financed for 30 days beyond the store’s floorplan assistance or interest-credit period. The average financed amount is $24,700, and the annual rate is 8.5%.
Daily interest per unit:
$24,700 × 8.5% ÷ 365 = $5.75
Monthly interest across 40 units:
$5.75 × 40 × 30 = $6,900
Manufacturer programs differ. Some provide floorplan assistance rather than a simple 90-day interest-free period. Use your OEM agreement and lender statement for the store’s exact calculation.
The management problem remains the same. Your ordering pace exceeded your selling pace.
Measure supply by model, trim, drivetrain and price band. A store might have 40 trucks and still lack the five configurations local buyers request.
More inventory does not fix the wrong inventory.
Action: Reforecast factory orders every month. Reduce orders where projected supply exceeds your target by 20% or more.
#6: A $200 Price Drop Every Seven Days Barely Moves the Listing
A used vehicle starts $1,200 above comparable listings.
The manager reduces the price by $200 after seven days. Another $200 comes off the following week.
The vehicle remains above market and collects another 14 days of interest.
Small reductions often fail to move a listing into a new search range. A buyer filtering for vehicles below $30,000 never sees a unit priced at $30,799. A $200 adjustment leaves the car outside the same filter.
Make a price change large enough to alter the vehicle’s competitive position.
At day 30, review:
- Price rank against comparable vehicles
- VDP views against store average
- Leads and appointments
- Cost to market
- Current wholesale value
- Interest paid to date
If the vehicle has weak traffic and a poor market position, one $800 reduction might produce more activity than four weekly $200 reductions.
The company reports an average age of 31 days across 4,200 units, compared with 67 days in its benchmark. For an 87-unit example, Cardealerships.com reports monthly floorplan expense falling from $18,400 to $6,200.
Owners should test those vendor-reported results against their own DMS and floorplan statements. Track interest expense, retail turn, wholesale loss, gross per copy and gross per inventory day for at least 90 days.
Action: Replace automatic $200 reductions with market-position targets and a firm day-30 decision.
Owner Math: What $400 a Day Costs Over One Year
Annual Carrying Cost
$400 × 365 days = $146,000
Estimated Gross Lost to Aging
$180,000
Total Annual Cost
$146,000 + $180,000 = $326,000
Do not classify the full $326,000 as floorplan interest.
In this example, $146,000 represents carrying cost. The other $180,000 represents estimated gross lost through aging, markdowns and wholesale exits.
Your controller should reconcile floorplan interest with the general ledger. Your Used Car Manager should own age, price position, turn and gross per day.
Put these four numbers on the daily used-car report:
- Average days in inventory
- Number of units aged 45 days or more
- Interest accrued by VIN
- Gross per day in inventory
If average age drops from 67 days to 31, the improvement should appear on the floorplan statement, aged-inventory report and monthly turn.
If only one report improves, inspect the math.
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