Car Dealership Bookkeeping: Doing the Books for a Used Car Lot
Car dealership bookkeeping means cars at cost in inventory, taxes and title fees held for the state, and a monthly routine. Here's how, step by step.
Car dealership bookkeeping comes down to one idea: a car is inventory until the day it sells, and the sales tax and title fees you collect belong to the state, not to you. Book every car at its full cost (purchase, auction fees, transport, recon), move that cost to cost of goods sold when the car sells, and keep the government's money in liability accounts until you remit it. Do that every month and the rest is routine.
Below: what makes a dealer's books different, the monthly routine, the IRS inventory rules, and the common mistakes. This is general information, not tax advice; your CPA should sign off on your accounting method.
Why are a car dealer's books different?
A coffee shop sells thousands of small items. A used-car lot sells a few dozen expensive ones, each with its own cost, its own title and often its own loan. That changes five things.
Inventory at cost
The IRS audit guide for independent used-car dealers says the cost of goods sold is the largest deduction on a dealer's return, and that the base cost of a car is increased by the reconditioning costs spent preparing it for sale (IRS MSSP Independent Used Car Dealers guide, Training 3147-106, chapter 4). The same guide says labor for reconditioning and delivery belongs in cost of goods sold, and cost for a car still on the lot at year end should be in the inventory value.
IRS Publication 538 describes inventory cost more generally as the invoice price less discounts, plus transportation or other charges to acquire the goods. For a car, that means the auction price, buyer fees and transport all go into the car, not into an expense account.
Floor plan
A floor plan is a loan against specific cars. When you buy a car on the line, you owe the lender for that car. When it sells, you pay that car off. Any principal you pay down reduces the loan, and the interest is an expense. Keep one floor plan payable account and make sure its balance matches the lender's statement, car by car.
Sales tax and title fees collected for the state
The IRS guide puts it plainly: sales taxes and registration and license fees are collected by the dealer and paid to the state. Book them to liability accounts when you sell the car, and clear those accounts when you remit. If they land in income, your sales look bigger than they are and the payment to the state later looks like an expense.
F&I income
Service contracts and similar products usually earn you a markup or a commission. Record the income separately from the car sale, and record the cost you owe the product provider as its own cost line, so you can see what F&I actually earns.
BHPH notes
On a buy-here-pay-here deal, the amount financed becomes a note receivable. Each payment is split: principal reduces the note (it isn't income), interest is income, and late fees are income. If you run a BHPH lot, our guide to starting a buy-here-pay-here lot covers the operations side.
What does the monthly bookkeeping routine look like?
Do these in order, every month, before you look at a profit number.
- Record every car you bought. Debit inventory for the purchase price, auction fees and transport. Credit cash, or the floor plan account if the lender paid.
- Record every recon bill against its car. Parts, labor, detail and outside shop invoices go into that car's inventory cost, not a repairs expense account. Our post on reconditioning costs covers tracking recon per car.
- Record every sale. Revenue for the selling price, doc and dealer fees as fee income, F&I products as F&I income, sales tax and title fees as liabilities, the trade-in into inventory, and the amount the customer or lender still owes as a receivable.
- Move each sold car's cost to cost of goods sold. Take the car's full cost (purchase plus recon) out of inventory in the same month as the sale.
- Record payments received. Down payments, lender funding, and BHPH installments split into principal, interest and fees.
- Record floor plan activity. Draws, payoffs on sold cars, other principal payments and interest.
- Reconcile the bank. Match every deposit and withdrawal to an entry. A deposit you can't explain is usually a payment nobody recorded.
- Remit sales tax and title fees. File on the schedule your state requires, and check that the liability account is back to what you still owe.
- Tie out inventory. The inventory account should equal the cost of the cars physically on your lot. If it doesn't, a sale or a purchase was missed.
If you're setting up accounts for this for the first time, our free dealership chart of accounts template lists the accounts a used-car and BHPH store needs.
Cash or accrual: which method can a dealer use?
For a long time the answer was simple. The IRS dealer guide says dealers are required to use the accrual method for sales and cost of sales because inventory is a big part of the business, citing Treasury Regulation section 1.446-1(c)(2)(i): where an inventory is necessary, purchases and sales must be on accrual.
That guide dates from 2002, and the rules have changed since for smaller businesses. Publication 538 now says that a small business taxpayer "can choose not to keep an inventory, but you must still use a method of accounting for inventory that clearly reflects income." The two methods it describes are treating inventory as non-incidental materials and supplies, or following the way inventory is handled on your applicable financial statement or your books and records.
Who counts as a small business taxpayer?
Publication 538 defines it as a business with average annual gross receipts at or under an inflation-indexed amount for the 3 prior tax years, that isn't a tax shelter. The IRS gives the indexed amount as $30 million for 2024, $31 million for 2025 and $32 million for 2026. Most independent lots are well under that.
What doesn't change
- You still need per-car cost. Even if the tax return is simplified, you can't price a car, judge a deal or answer a lender without knowing what each car cost you.
- Installment reporting isn't open to dealers. The IRS guide cites section 453(b)(2), which disallows the installment method on dealer dispositions, and flags dealers who spread BHPH sales income over the life of the contract. The sale is income when the car is sold, and interest is income as it's earned.
Pick your method with your CPA, since changing it later is a formal change in accounting method.
What are the most common dealership bookkeeping mistakes?
Expensing cars instead of carrying them in inventory
Writing a car off as an expense the day you buy it makes the month you bought it look like a loss and the month you sold it look like pure profit. It also means your balance sheet shows no inventory, which is a problem when a lender asks to see it. Buy to inventory, sell out of inventory.
Treating sales tax as income
If the full amount the customer paid goes to sales, you overstate revenue and then book the remittance as an expense. The profit may come out the same, but your sales figure is wrong, your margins are wrong, and you have no account showing what you still owe the state. Keep sales tax and title fees in liability accounts.
Booking the trade at the allowance instead of ACV
This is the dealer-specific one. If you give a customer $5,000 for a trade that's worth $4,000 at auction, the car is not worth $5,000. The IRS guide calls that $1,000 an over-allowance, the excess of the trade allowance over the car's actual cash value, and its worked example books the trade into inventory at ACV with the over-allowance as a separate discount against the sale.
| Hypothetical trade | Amount |
|---|---|
| Trade-in allowance given | $5,000 |
| Actual cash value | $4,000 |
| Goes into inventory | $4,000 |
| Over-allowance (a discount on the sale) | $1,000 |
If you book the trade at $5,000, the extra $1,000 sits in inventory until that trade sells, then shows up as a loss on a car that wasn't really a bad buy. The guide also warns about dealers who record sales net of the trade and then deduct the trade's cost again when it sells, which it says produces a double deduction. For the harder version of this, see negative equity trade-ins.
How AutoDealer.io handles the books
If you use AutoDealer.io, the ledger posts itself: every sale, payment, vehicle purchase, recon cost and floor plan event books a balanced journal entry within minutes. The built-in accounts follow the structure above, including Vehicle Inventory, Sales Tax Payable, License & Registration Fees Payable for tag and title fees (a liability, never fee income), Notes Receivable - BHPH, and Sales Discounts for a trade's allowance over ACV. Entries are only ever added; fixing a deal posts a dated correcting entry instead of editing the old one.
The Books area shows a Profit & Loss and a Balance Sheet on a management basis (accrual at sale, BHPH interest as collected). They aren't audited statements, and sales tax remittance is something you still record yourself. See the Books overview for what's covered.
Frequently asked questions
Can I do the books for a small car lot myself?
Yes, if you keep the monthly routine and your CPA sets up the chart of accounts and reviews the year. The work that matters most is recording each car's full cost, each sale's parts (revenue, tax, fees, trade, receivable) and reconciling the bank every month. Most problems come from months that got skipped.
Is reconditioning an expense or part of the car's cost?
Part of the car's cost. The IRS used-car dealer guide says the base cost of a car is increased by reconditioning costs spent preparing it for sale, and that reconditioning labor belongs in cost of goods sold. It becomes an expense (as cost of goods sold) when the car sells.
Is the doc fee income or a pass-through?
A doc fee the dealership keeps is income, so book it to a fee income account. Title, tag and registration fees you collect and send to the state are not income; they go to a liability account until you pay them.
How should I record a buy-here-pay-here payment?
Split it. Principal reduces the note receivable, interest goes to interest income, and any late fee goes to late fee income. Booking the whole payment as income overstates profit, especially early in the loan when payments are mostly principal.
Sources
- IRS Market Segment Specialization Program: Independent Used Car Dealers, Training 3147-106 (Rev. 08-2002) (copy of the IRS guide; the IRS no longer lists it on its audit technique guides page)
- IRS Publication 538, Accounting Periods and Methods
- IRS: Questions and answers about the limitation on the deduction for business interest expense (inflation-adjusted gross receipts amounts)