Every dealer knows aged inventory is bad. Far fewer can say what it costs per day, which is why aged units persist. The cost is not a single visible charge; it is three smaller ones accruing quietly at the same time, and by the time the unit finally moves, most of its gross has already been consumed by holding it.
A credit desk approaches the same problem from the other side. It reads the aging report as a measure of how quickly capital recycles inside the store, and as evidence about whether the operator makes hard decisions on time. Both readings matter, and both come from the same one-page report.
Turn is a second interest rate
A dealership earns its return by cycling the same dollars through inventory repeatedly. A store turning its inventory six times a year with a million dollars on the lot supports six million of annual cost of sales. At four turns, the same million supports four million. To sell the same number of cars at four turns, the store must carry fifty percent more inventory, and finance it.
That is why turn behaves like a rate. Slower turn does not just delay income; it raises the amount of capital required to produce the same income, which raises the cost of producing it. Two stores with identical gross per unit can have materially different economics purely because of how long their cars sit.
Three measurements, and how they differ
Days on lot
The age of an individual unit, measured from acquisition or from the date it was made available for sale. Pick one convention and use it consistently; mixing them makes the aging report unreadable and invites a question you do not want to answer twice.
Days supply
Current inventory units divided by average daily retail units. A store with 90 units retailing 40 a month averages about 1.33 units a day, so days supply is roughly 68. This is a forward-looking measure of how long it would take to sell everything currently on the lot at the current pace.
Turn
Annual cost of sales divided by average inventory value, or more simply, 365 divided by average days on lot. At 68 days supply, the store turns roughly 5.4 times a year. Turn is the figure to compare across periods, because it is unaffected by the size of the store.
The arithmetic of a single day
The daily cost of holding a unit has three parts: financing, insurance and facility overhead allocated to the unit, and wholesale market depreciation. The first two are small and steady. The third is the one that does the damage, and it is invisible until the unit is wholesaled.
Reading the aging report by cohort
Total inventory count tells you almost nothing. The distribution tells you everything. A desk breaks the lot into age buckets and looks at both the share of units in each and the gross actually realized on units that sold out of each bucket during the period.
| Age bucket | Share of inventory | Avg front gross realized | Read |
|---|---|---|---|
| 0–30 days | 46% | $1,780 | Healthy core; correctly bought and priced |
| 31–60 days | 29% | $1,410 | Normal; still profitable |
| 61–90 days | 15% | $860 | Carry is eating the deal |
| 90+ days | 10% | $120 | Value transfer to the floorplan provider |
The figures above are illustrative and will vary by store, segment and market. What generalizes is the shape: realized gross declines sharply with age, and the last bucket is usually close to a break-even or a loss once carry is counted.
Why the 90-plus bucket is read as a management signal
An underwriter does not treat aged units purely as an economic problem. A unit sitting past ninety days is a decision that has not been made. The store either has not repriced it, has not wholesaled it, or is holding out for a gross that the market has already declined to pay.
Operators who cut quickly show a small, stable 90-plus bucket even in a difficult market. Operators who do not show a bucket that grows every month, which tells a reviewer something about how other decisions in the store are likely to get made. That inference is why the aging report carries weight out of proportion to its length.
Velocity against gross: the real tradeoff
Pricing to move faster lowers front gross per unit and raises volume. Pricing for gross does the reverse. The arithmetic settles it in a specific store, not in general.
Take a store retailing 40 units at $1,450 front gross, or $58,000 a month. Price more aggressively: front gross falls to $1,180 but volume rises to 52 units, producing $61,360. The store made $3,360 more, carried less aged inventory, and used its floorplan line more efficiently. If back gross holds per unit, twelve extra deals also produce roughly $13,800 of additional back end at $1,150 PVR. That is the case for velocity. It reverses if the extra volume requires advertising spend or staffing that eats the difference, which is why it is a per-store calculation. Figures are illustrative.
What velocity does to a credit file
Faster turn improves a file in four distinct ways, which is unusual, most improvements move one number. It raises annual gross from the same inventory investment, lowers floorplan expense per unit sold, reduces the curtailment burden by keeping units inside their windows, and increases average daily balance because cash returns to the account sooner.
That last effect is the one operators overlook. A store that funds deals quickly and turns inventory in 45 days holds visibly more cash across a statement cycle than an identical store at 75 days, and average daily balance is read directly off the statements.
Fixing turn without dumping the lot
The instinct when aging gets bad is a sale event that clears everything at once. That works once and usually costs more than it recovers. Structural fixes hold.
Turn discipline that survives contact with a bad month
- Set a hard age policy with dated decision points, and put the dates in the system rather than in someone's memory.
- Reprice on a schedule rather than on request, so aging units get attention before they cross a threshold.
- Track realized gross by age bucket monthly, so the cost of waiting is visible to whoever makes the call.
- Measure recon turnaround separately; days lost in the shop are days on lot the sales floor never had.
- Compare days supply by segment and body style, not just at the store level.
- Cap acquisition in any segment where days supply already exceeds your target.
- Wholesale on the calendar date rather than after another price cut, and record the realized loss honestly.
- Review the trailing acquisition source of every unit that crossed 90 days, and buy differently next time.
What is a good days supply?
It varies by market, price band and how quickly a store can recondition. Rather than chase a benchmark, measure your own trend and your distribution by age bucket. A store improving from 75 days to 55 while holding gross is telling a much better story than one hitting an arbitrary target by wholesaling aggressively.
Should days on lot start at acquisition or at frontline ready?
Acquisition is the more honest convention for capital purposes, because the money left the building on the acquisition date and the carry started then. Many stores track both so that reconditioning delays are visible separately. What matters most is consistency across periods and reports.
Is a fast turn always better?
No. Turn is only valuable when the gross survives it. A store turning ten times a year at four hundred dollars of total gross per unit against a fixed cost of eleven hundred is going out of business quickly and efficiently. Turn and gross per unit have to be read together against fixed cost per unit.
How do lenders verify aging?
Typically by comparing the inventory report against the floorplan statement, which carries its own aging and curtailment detail. Discrepancies between the two are noticed immediately, so it is worth reconciling them before submitting anything.
Does wholesaling aged units hurt my financials?
It realizes a loss that was already economically incurred, which does reduce reported gross in the period. Most underwriters read a deliberate wholesale discipline favorably because it demonstrates decision-making and recycles capital. What reads poorly is a large aged bucket carried at cost for months and then cleared all at once.
How quickly can turn actually improve?
Repricing and wholesale discipline can change the aging distribution within one or two months, since they act on units already on the lot. Buying discipline takes longer to show up because it affects units acquired going forward. Most stores see the distribution shift before the average turn statistic does.
Does slow turn by itself cause a decline?
Rarely on its own. It usually shows up as a contributing factor: slow turn produces higher floorplan expense, a heavier curtailment load and a weaker average daily balance, and those are the figures that appear in the decision. The aging report is where an analyst goes to explain numbers they have already seen elsewhere.
Where to start
Print the aging report and split it into the four buckets above. Then pull realized front gross for the units that sold out of each bucket last quarter. The gap between the first bucket and the last is the cost of your current turn discipline, expressed in dollars you can act on.
If the 90-plus bucket is above a tenth of your lot, that is the first project, and it is a repricing and wholesale decision rather than a capital one. Capital raised to support a slow-turning lot funds the same problem at a larger scale.
Qualified Commercial Underwriting Desk
Credit and capital markets
The Qualified Commercial underwriting desk reviews commercial real estate, dealer and Main Street files daily. The Academy is written from that work (how files are actually read, priced and declined) rather than from a rate sheet.
Educational content only. Nothing here is a commitment to lend, an offer of credit, or tax, legal or accounting advice. Program terms, timelines and thresholds vary by lender, file and market conditions, and any figures shown are illustrative.