The difference comes down to who funds the car. On an open lot, you pay for the vehicle with your own cash, so the cost sits in inventory and nothing else changes until the sale. On a floorplan, a lender advances the money, so every car carries a matching loan, daily interest and a payoff you must clear when it sells. You book the same vehicle cost either way. What changes is the liability, the interest expense and the reconciliation you owe the lender.
TL;DR
- Open-lot (self-funded) inventory needs one record per VIN: purchase price, transport, recon and fees. There is no lender balance to track.
- Floorplan inventory adds a notes payable balance per VIN, monthly interest on the average daily balance, curtailments and a payoff at sale.
- Interest and fees are expenses. Principal payments reduce the liability and never touch profit.
- Reconcile your inventory list, the lender statement and the general ledger every month, and pay off sold units promptly to avoid being sold out of trust.
- FIFO and LIFO matter for tax and reporting. Vehicles are normally costed by VIN, so most independent lots never need a cost-flow assumption.
Table of Contents
- What “open lot” and “floorplan” mean in the books
- Side by side: how each model records the same car
- Booking an open-lot purchase
- Booking a floorplan purchase
- Reconciling the lot, the lender and the ledger
- Which model fits your lot?
- FIFO vs LIFO for cars
- Floorplan interest and the tax picture
- Where per-car profit goes wrong
- Put each VIN’s cost, interest and payoff in one place
- FAQ
- Sources
What “open lot” and “floorplan” mean in the books
Dealers use “open lot” loosely, so here is the sense used in this article: inventory you bought with your own money or a general business loan, with no lender holding a line tied to each unit. “Floorplan” means a revolving line of credit that pays for the vehicles on your lot. The Office of the Comptroller of the Currency describes floor-plan lending as financing inventory through advances against specific collateral, with each advance repaid when its collateral sells.
Many independent lots run a mix. A few cars are bought outright, and the rest go on the line. The accounting works best when every unit is flagged by funding source from the day it is acquired.
The National Automobile Dealers Association calls floor plan lending a foundational pillar of the dealership business model because it lets dealers carry deep inventory without tying up all their working capital. That is the real trade: floorplan buys you stock and flexibility, and in return you owe interest and discipline.
Side by side: how each model records the same car
| Event | Open lot (self-funded) | Floorplan |
|---|---|---|
| Purchase | Debit used-car inventory, credit cash or bank | Debit used-car inventory, credit notes payable (floorplan) |
| Transport, recon, fees | Add to that VIN’s inventory cost | Same, paid from cash while the advance stays at the original amount |
| Carrying cost | Opportunity cost of cash, not booked | Interest and fees booked as expense |
| Curtailments | None | Debit notes payable, credit cash |
| Sale | Move VIN cost to cost of sales, record revenue | Same, plus pay off the advance |
| Control risk | Cash tied up, stale cars go unnoticed | Unit sold but loan unpaid |
The GM dealer accounting manual’s entry on notes payable for used vehicles shows a financed used-vehicle purchase recorded in used-car inventory and notes payable, with curtailment and payoff amounts posted to notes payable and cash.
Booking an open-lot purchase
With no lender, the books are simple but the discipline is not. Each vehicle needs its own cost record, built up as money goes out:
- Purchase price at auction or from a trade-in or private seller.
- Buyer fees and transport to get it to your lot.
- Recon: parts, labor, detail, inspection, tires.
- Other direct costs such as title fees or a safety inspection.
All of that rolls into the VIN’s inventory value. When the car sells, the full accumulated cost moves to cost of sales, and the difference from the sale price is your true gross on that unit.
The common failure on open lots is not the entries, it is the scatter. A repair receipt sits in a truck, a transport invoice is paid from a personal card, and the car “made about three grand” until the books say otherwise. Because there is no lender statement forcing a monthly tie-out, nothing exposes the gap. If you run a self-funded lot, build your own tie-out: total of per-VIN inventory costs must equal the inventory account on the balance sheet.
Our guide to per-VIN inventory costing walks through how to capture those costs unit by unit.
Booking a floorplan purchase
When a lender advances funds, you record the vehicle in inventory at cost and the advance as a liability. The OCC notes that a dealer’s floor-plan liability appears on the balance sheet as notes payable, and that floor-plan interest is usually payable monthly based on the average daily outstanding balance.
That last point shapes your workflow. Interest accrues on every unit every day, so a car that sits 90 days costs far more to carry than one that sells in 20, and you cannot see that on a month-level report.
Interest and fees are expenses, principal is not
The mistake that distorts more dealer financials than any other is mixing these up. Interest and fees are the cost of carrying inventory and belong on the income statement. A curtailment or payoff is a reduction of the liability, not an expense. If you book a principal payment as an expense, your profit looks lower than it is and your debt looks higher than it is. If you book interest as principal, you do the reverse.
Where you can, assign interest back to the VIN that generated it. Then the profit on a car includes what it cost to finance, not just what it cost to buy and fix. Our piece on per-VIN floorplan fee accounting covers how to allocate it cleanly.
Curtailments
Many lenders require a partial principal payment after a unit has aged a set number of days. Each curtailment lowers notes payable for that VIN. Track the due date per unit, since a missed curtailment can bring fees or a default notice. You can see how aging drives cost in per-VIN floorplan utilization analysis.
Payoff when the car sells
When a financed unit sells, the advance against it is repaid. That is how the OCC describes the mechanics: when each piece of collateral sells, the advance against it is cleared. In your books, the sale entry and the payoff entry should post in the same day or two. Lenders watch this closely, and a dealer that sells a unit and keeps the proceeds is considered sold out of trust. Use a fixed process, such as the one in our VIN-level floorplan payoff checklist, so a deal never gets funded without a payoff line.
Reconciling the lot, the lender and the ledger
Open-lot records and floorplan accounts have to agree with each other. A floorplan lender audits the lot to confirm the collateral is physically there. The NADA overview of floor plan lending points to periodic inventory audits by lenders to verify that every collateralized vehicle remains on the lot. Your own monthly reconciliation should find problems before the auditor does.
A workable month-end routine:
- Pull the lender statement, with each VIN and its advance.
- Pull your inventory list by VIN with funding source.
- Match the two. Every financed VIN on your lot should have an advance, and every advance should have a car on the lot or a sale in progress.
- Tie the lender total to the notes payable account, and the inventory list total to the inventory account.
- Investigate the differences: sold cars not yet paid off, advances for units you never booked, interest that does not match the statement.
- Walk the lot and compare against the list.
The month-end VIN floorplan reconciliation guide expands each step, and a physical inventory count keeps the list honest. Do not skip the bank side either: a monthly dealership bank reconciliation catches payoff checks that never cleared.
Mistakes that distort the numbers
These patterns show up again and again in mismatches between a lender statement and the books:
- Sold units left on the floorplan after the sale.
- Interest calculated by hand, or with an outdated rate.
- Lost VIN traceability, so a cost lands on the wrong car.
- Missed curtailment deadlines.
- No periodic tie-out to the lender statement.
Every one of them is a process failure, not an accounting-theory problem. The fix is the same: one record per VIN, funding source flagged, and a monthly tie-out.
Which model fits your lot?
The accounting question usually follows a financing question. A few practical points:
- Small, cash-funded lots get clean profit numbers fastest. The risk is slow turns hiding in a pile of money you cannot see. Track days on lot anyway.
- Floorplanned lots get volume and selection, but must watch the cost of every aging day. Interest on a slow car comes straight out of that car’s gross.
- Mixed lots must tag funding source per VIN. Otherwise the lender statement will never tie to the ledger.
Cash flow also behaves differently. A floorplan line can drain cash if payoffs lag, recon is paid out of pocket, and curtailments hit on aging stock. Our floorplan cash flow guide and the 13-week cash flow forecast show how to plan for it.
Keeping business finances organized starts with separating what you own from what you owe. For a broader look at managing business finances, that principle applies to every funding source on the lot.
FIFO vs LIFO for cars
Readers ask whether FIFO or LIFO applies to vehicle inventory. The short answer: FIFO assumes the oldest units sell first and LIFO assumes the most recently acquired sell first. In a period of rising costs, LIFO matches newer, higher costs against current revenue, which lowers cost of goods sold and taxes, while FIFO leaves higher inventory values and income on the books.
But cars are not interchangeable bulk goods. IRS Publication 538 says FIFO or LIFO are typically used when items cannot be specifically identified or goods are intermingled. A used car has a VIN, a purchase price and a recon history, so specific identification is the natural basis for a used lot. That is why a per-VIN cost record is the standard, and it works the same on open lot or floorplan.
If you do elect LIFO, plan with your CPA. The IRS auditing guide for dealerships explains the LIFO conformity requirement under Internal Revenue Code Section 472: generally, the method used for taxes must also be used for primary financial reporting to creditors and shareholders. That matters on a floorplan, since your lender reads those statements. The same guide notes that used-car dealers may use simplified dollar-value LIFO or the Vehicle-Pool Method. Those are elections to make with a tax professional, not a bookkeeping default.
Floorplan interest and the tax picture
The interest itself has a tax angle. According to the NADA overview, floor plan financing interest is carved out of the §163(j) limit and is generally deductible in full, but a business using the exception can lose eligibility for bonus depreciation. That is a choice to model with your CPA before filing, using the actual floorplan interest your books show. Clean per-VIN interest records make that conversation faster. For the broader reporting framework, see our GAAP guide for car dealers.
Where per-car profit goes wrong
Whether you are open lot or floorplan, the profit question is the same: what did this car actually cost, and what did it actually earn? Generic accounting software tends to record a month of expenses and a month of revenue. Dealers need the unit view.
A worked example. You buy a car for $12,000 at auction, pay $350 for transport and spend $900 on recon. On an open lot, the inventory cost is $13,250. If it sells for $15,500, your gross is $2,250. On a floorplan, suppose the advance covers the $12,000 and the car sits 45 days. If interest and fees come to $180 (an illustrative figure), your gross after carrying cost is $2,070. Same car, same sale price, and the financed version quietly gave back $180 that a month-level report would have buried in overhead.
Multiply that by a lot of 40 units and the pattern is plain: the cars you think are your best earners may be the ones that sat longest. This is also why recon WIP accounting matters, since recon spend is the cost most likely to arrive after you think the car is done.
Our view: the unit is the ledger
Most bookkeeping setups were built around a month. Dealers live around a VIN. When we built Loturn, we started from one conviction: every cost a vehicle touches, from the purchase price to transport, recon and floorplan interest, belongs on that vehicle’s record the moment it happens.
That is why we do not treat open-lot and floorplan as two systems. Both are a VIN with a cost stack. Floorplan adds a lender balance, an interest accrual and a payoff to that stack, and our approach is to keep them on the same record so the lender statement and the ledger can be compared car by car, not in a pile.
We designed native double-entry accounting with an automotive chart of accounts so interest lands as an expense and principal lands against notes payable, without the dealer needing to be an accountant. The goal is simple: you see your true profit on a car before you sign the deal, not three months after.
Eric Dosset
Put each VIN’s cost, interest and payoff in one place
Loturn is a financial management platform built for independent used-vehicle dealers. It tracks every cost against each vehicle, covers inventory, accounting, CRM and reporting, and includes floorplan interest tracking, with free data import and onboarding support so you do not start from a blank screen.
Plans are flat monthly pricing: Flipper is $99 per month, Dealer is $349 per month and Multi-Lot is $699 per month. You can compare them on the Loturn pricing page.
If you want a first look at how the setup works for your own inventory, start at loturn.com and see how per-car profit looks on your numbers.
FAQ
Is floorplan interest part of a car’s cost?
It is a carrying expense that you record on the income statement, not part of the vehicle’s purchase cost in inventory. Many dealers still allocate it to the VIN in their internal reporting so they can see profit after financing. The OCC handbook says the interest is usually payable monthly on the average daily balance, so it is easy to compute per unit.
What does “sold out of trust” mean?
It means a financed vehicle has sold but the lender has not been repaid for it. Lenders audit the lot to check collateral, so the safest habit is to pay off each sold unit promptly and reconcile to the lender statement every month.
Should a small used-car lot use FIFO or LIFO?
Most small lots cost each car by VIN, which is specific identification, rather than assuming a flow. The IRS guidance in Publication 538 points to FIFO and LIFO for items that cannot be specifically identified. If you consider LIFO for tax, talk to a CPA first because of the conformity rules.
Do I need separate books for cars bought with cash and cars on the floorplan?
No. Use one inventory record per VIN and flag the funding source. Financed units carry a notes payable balance, and cash units do not. That flag is what lets your lender statement tie to your ledger each month.
Sources
- Floor Plan Lending, Comptroller’s Handbook (OCC)
- 311 Notes Payable - Used Vehicles (GM Accounting Manual)
- Dealerships 101: What is Auto “Floor Plan” Lending? (NADA)
- IRS Publication 4435, Dealership Audit Technique Guide
- IRS Publication 538, Accounting Periods and Methods