HOW THE MONEY WORKS

A car deal in plain English — the computer does this math on every retail order; here's what it's actually doing · BDC training board

THE PHONE CALL
Customer: “I'm driving a 2024 Nissan Rogue, my payment's about $450.”
Rep: “What are you budgeting for the new payment?” Customer: “No more than $500.”
You may never write the order — but when you understand this board, you understand what that $500 promise meets at the desk.

1The sticker and the selling price

MSRP — the Manufacturer's Suggested Retail Price — is the number on the window sticker. The factory suggests it; nobody is required to pay it. The selling price is what the customer and the dealer actually agree on. Every bit of math on this board starts from the selling price — not the sticker.

MSRP — window sticker ($)

Selling price — agreed ($)

2The rest of the deal

Type in your own numbers — everything below updates instantly.

Their trade is worth ($)

They still owe on it ($)

Factory rebate ($)

Cash down ($)

Sales tax (%)

Fees — DMV + dealer ($)

Interest rate (% APR)

Customer's budget ($/month)

Trade-in tax credit (New York and many states): the customer already paid sales tax once when they bought the Rogue. The state doesn't tax the same money twice — so the trade's value comes off the price before tax is figured.

What's actually inside “fees”?

Doc fee — the dealer's paperwork charge (New York caps it by law).
Title & registration — the DMV charges to put the car in their name and give it plates.
Inspection — the state safety/emissions check.
Lien filing — a few dollars for the DMV to record that the bank has an interest in the car until it's paid off.

These are real costs on every retail order. They're not profit games — but they ARE part of what gets financed, so they belong in the math.

3The order of the math

The customer hears “$32,500 car.” The computer builds the order in a strict sequence — and the order matters, because it decides what gets taxed:

Why does the trade come off before tax, but the rebate after?

Two different kinds of money. The trade is the customer's own property — they already paid sales tax on it once, so the state gives credit and only taxes the difference. The rebate is the factory helping the customer pay the bill. The dealer still sold the car at the full selling price — so the state taxes that full amount first, and then the rebate goes toward the bill, like a coupon applied after tax at the register. That's why a $1,500 rebate saves exactly $1,500 — not $1,500 plus tax.

4The payment — and the stretch

Monthly payment

—

Pay it off over 72 months

243648607284

The car costs

—

the amount financed

The money costs

—

total interest over the whole loan

They'll pay in total

—

5The amortization table — the loan's diary

Amortization is just a big word for paying a loan down a little at a time. The amortization table is the loan's diary: one line per payment, showing how much of that payment was rent on the money (interest), how much actually bought the car, and what's still owed afterward. Three pages of the diary:

Notice the pattern: early payments are heavy on rent, because the balance is big. As the balance shrinks, the rent shrinks, and more of the same payment buys the car. The payment never changes — only what it's made of.

Open the full table — every payment, start to finish

Payment #	Payment	Rent (interest)	Buys the car	Still owed

6Find the missing number

At the desk you always know some numbers and need the missing one. Pick the question:

7The money grid — down payment vs. months

Every payment this deal could be. Down payment on the left, loan length across the top. This is what money down does — slide down a row and watch every column drop.

Green = at or under the customer's $500 budget. The gold-ringed row is the cash down on the deal right now.