DealerMath Blog

Expert tips on car negotiation, dealer tactics, financing, and how to save thousands on your next car purchase.

Car price sticker showing MSRP versus hidden dealer invoice cost with profit margin exposed
Negotiation TacticsJun 8, 20267 min read

Dealer Invoice vs. MSRP: What the Dealer Really Paid (And What You Should Pay)

MSRP is what the dealer wants you to pay. Invoice is what they paid — sort of. Learn the real numbers behind car pricing, holdback, incentives, and what price to actually target.

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Car buyer getting called back to dealership after spot delivery — yo-yo financing scam exposed
Dealer ScamsJun 8, 20266 min read

Yo-Yo Financing: The Spot Delivery Scam That Traps Car Buyers (2026)

Yo-yo financing is when a dealer lets you drive home, then calls days later claiming financing fell through — forcing you into a worse deal. Learn how it works and how to fight back.

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Finance manager pushing extended warranty paperwork across desk with hidden markup percentages revealed
Car FinancingJun 4, 20267 min read

Extended Warranties: The F&I Office Scam That Costs Buyers $3,500

Dealers make $1,500–$3,000 profit on every extended warranty sold. Learn which F&I products are worth buying, which are pure profit, and how to say no in the finance office.

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Car dealer secretly lowballing trade-in value on worksheet while buyer looks away
Dealer ScamsJun 4, 20265 min read

How Dealers Lowball Your Trade-In (And the 5 Tricks They Use)

Car dealers use 5 proven tactics to undervalue your trade-in by $2,000–$5,000. Learn how to spot trade-in lowballing, what your car is really worth, and how to fight back.

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Car dealer adding hidden fees to monthly payment worksheet — payment packing trick exposed
Dealer ScamsJun 2, 20267 min read

What Is Payment Packing? The #1 Trick Dealers Use to Steal Your Money

Payment packing is when a car dealer inflates your monthly payment to hide extra profit. Learn how to spot it, how much it costs you, and how to fight back.

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Confident car buyer negotiating lower price with dealer using counter-offer strategy
Negotiation TacticsJun 2, 202611 min read

How to Negotiate a Car Price (2026 Step-by-Step Playbook)

Step-by-step car negotiation playbook for 2026. Learn exactly what to say to get a lower price, beat dealer tactics, and save thousands on your next car purchase.

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Magnifying glass revealing hidden car dealer fees on invoice — doc fee, market adjustment, add-ons
Dealer ScamsJun 2, 20269 min read

Hidden Car Dealer Fees: The Complete List (And How to Remove Them)

A complete list of hidden car dealer fees you can legally refuse — doc fees, market adjustments, add-ons, and more. Learn which fees are fake and how to get them removed.

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Dealer secretly increasing APR rate on car loan — APR markup trick costing buyers $3,000
Loan & APRJun 2, 20269 min read

What is APR Markup? (And How Dealers Add $3,000 to Your Loan)

Dealer APR markup is the #1 hidden profit center in car financing — costing buyers an average of $487 per loan. Here's exactly how it works and how to stop it

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Average car buyer losing $1,800 to dealer tricks and hidden fees at dealership
Negotiation TacticsJun 2, 202610 min read

The Average Car Buyer Loses $1,800 — Here's Why (2026 Data)

New data reveals the average car buyer overpays by $1800 on a single purchase. Here's where the money goes & the 7 hidden ways dealers add profit you never see.

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4-square car dealer worksheet broken down into four quadrants with negotiation tricks revealed
Negotiation TacticsMay 31, 20266 min read

How to Read a 4-Square Worksheet in 60 Seconds (Step-by-Step Guide)

Sitting at the dealer desk right now? Here's how to decode a 4-square worksheet in 60 seconds and spot the $2,000+ in hidden profit before you sign.

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