Never Negotiate the Monthly Payment
Trade-Ins · Taxes · Out-The-Door Prices
The biggest mistake you can make at a dealership is answering the question: "What monthly payment are you looking for?" Dealerships use the "Four Square" method to manipulate loan terms, interest rates, and trade-in values to hit your monthly payment, usually resulting in you paying thousands more for the car.
Always Negotiate the "Out-The-Door" Price
You should only negotiate one number: the Out-The-Door (OTD) price. This is the final amount required to buy the car, including the negotiated car price, your trade-in, state sales tax, title fees, and the dealership's doc fee.
- Get Pre-Approved: Bring an interest rate from your local bank or credit union before walking into the dealership.
- Separate the Trade: Negotiate the price of the new car first, then discuss your trade-in.
The Hidden Trade-In Tax Advantage
In over 40 US states, trading in your vehicle at the dealership provides a massive tax break. You only pay sales tax on the difference between the new car price and your trade-in. For example, trading in a $10,000 car with a 7% state tax rate saves you $700 in pure cash. Our calculator automatically factors this in!
The Trap of 72 and 84-Month Loans
To keep monthly payments low on increasingly expensive cars, dealerships now push 72 and 84-month (7-year) loans. This is extremely dangerous. Cars depreciate quickly. If you take out a 7-year loan with a small down payment, you will likely be "upside down" (owing more than the car is worth) by year two. If the car is totaled or you want to sell it, you will have to write a massive check to the bank just to get rid of it.
Aim to follow the 20/4/10 Rule: Put 20% down, finance for no longer than 4 years (48 months), and keep total car expenses (payment + insurance) under 10% of your gross income.