How to beat the four-⁠square worksheet

Written and checked by Drago. Last reviewed October 1, 2026

Settle one number at a time, starting with the out-the-door price. The four-square worksheet puts the car's price, your trade-in, your cash down, and the monthly payment on one page, so all four can move at once. When the talk stays on the payment, it's hard to see what you're really paying. Get the price in writing first, then handle the trade-in and the loan separately.

How we review this guidance. Rules and fees can vary by state, lender, dealer, and vehicle.

The short answer

Get a written, itemized out-the-door price first: the car plus taxes, every fee, and every add-on.
Bring up your trade-in only after the price is set, so a generous trade-in offer isn't paid for with a higher price.
A lower payment often just means a longer loan. In a CFPB example, a $20,000 loan at 4.75% costs $1,498 in interest over three years and $3,024 over six.
Your cash down lowers what you borrow. It isn't a discount on the car.
Before you sign, match every number on the contract to the written deal. If anything changed, don't sign yet.

How the four-⁠square worksheet works

What this means

The worksheet's four boxes are car price, trade-in value, cash down, and monthly payment. Some dealers steer you to the payment, which hides the total cost. When all four move at once, you can't tell which got worse.

A lower payment can come from more cash down, a longer loan, a different trade-in value, or more money borrowed. The payment alone won't tell you which one moved.

First, get a written, itemized out-the-door price (the car plus taxes, every fee, and every add-on). Then handle the trade-in and loan separately. Check your trade against outside offers. Compare loans by APR (the loan's yearly cost, including interest and some fees), number of months, amount financed, finance charge, and total of payments.

Take a photo of each worksheet, or ask for a copy. Write each offer in your own columns. If the dealer won't give you enough detail to check the math, you don't have a real offer.

What to say

“I'm not negotiating four numbers at once. Give me the itemized out-the-door price first. We'll talk about my trade-in and financing after that number is set.”

A dealer might say:

"Which monthly payment works for you, and how much can you put down today?"

What to watch for:

They're starting with payment and cash, not a set car price. That hides the total cost.

You could say to the salesperson:

"Let's start with the itemized out-⁠the-⁠door price. We can talk about my trade-⁠in and financing after that total is in writing."

Adapt these words to your situation. Ask for the answer in writing before you sign.

Take the four boxes one at a time

Settle the car price first. Then the trade-in. Then the loan. The CFPB says negotiating some of these details separately can get you a better price.

Car price. Get the sale price plus every fee and add-on in writing. The FTC suggests getting this out-the-door price before you visit and before you talk financing. See what an out-the-door price includes.
Trade-in. Get the dealer's offer, what you still owe, and what's left over (or short). The FTC says to wait to discuss the trade-in until after you've settled the price, so the dealer can't raise the price to cover a generous trade-in offer. Get outside offers too.
Cash down. Ask where every dollar goes. A down payment lowers what you borrow, and the CFPB says a larger one may lower your rate. It's a way to pay, not a discount.
Financing. Get the APR, number of months, amount financed, finance charge, and total of payments. Bring a preapproval from a bank or credit union so the dealer has a rate to beat. See how to compare dealer loan rates.

Owe more on your trade-in than it's worth? That's called negative equity. The CFPB says rolling it into the new loan makes the loan more expensive. If the dealer promises to pay it off, make sure it isn't hiding in your new loan or the final contract.

Why the dealer asks what monthly payment you want

Because the payment is easy to shrink without lowering your cost. The FTC says lower monthly payments often come with longer loans and higher interest rates, which can raise your total cost a lot.

The CFPB gives an example. Borrow $20,000 at 4.75% for three years, and you pay $597 a month and $1,498 in interest. Stretch it to six years, and the payment drops to $320, but the interest grows to $3,024.

In an FTC study of car buyers, most cared mainly about the monthly payment when they talked about the loan. A number of them took longer loans to get a lower payment. Some were surprised by the total cost when they looked at their paperwork. One buyer said the dealer tried to keep the focus on the payment and off the car's price, the add-ons, and the loan length.

If you're asked what payment you want, you don't have to answer. Say you'll talk about the payment after the out-the-door price is in writing. See words to say when they ask.

How one box can pay for another

When all four numbers are in play, a better deal in one box can be paid for in another. Research reviewed in the FTC study suggests dealers will give a discount on one part of the deal to make more on another, such as the car's price and the trade-in.

Some of the buyers the FTC interviewed said it happened to them:

A few had to accept a higher interest rate to get a rebate.
One got a lower price on the new car by accepting less for the trade-in.
One was quoted a different price depending on how she paid: cash, delayed payments, or regular financing.

That's why you settle each number in writing before you move to the next. If a number you already agreed on changes, ask why before you go on.

Check the final contract before you sign

The FTC says to compare the papers you sign with the price and terms the dealer sent you ahead of time. If they don't match, ask questions and be ready to walk away.

Match the price, trade-in credit, cash down, APR, months, and amount financed to your written deal.
Look for any product, fee, or add-on you didn't agree to.
Ask for the Truth in Lending disclosure before you sign, says the CFPB. It shows the APR, finance charge, amount financed, and total of payments.
Make sure every blank is filled in and you leave with copies, as the CFPB advises.

Can you check every number yourself?

Don't sign a worksheet you can't check. Get price, trade-in, and financing in writing, one at a time. Leave if the dealer keeps mixing them.

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Sources

These sources explain general rules. Check current requirements in your state and the terms in your own paperwork.