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If I plan to buy a car in cash, should I let the dealer know?
Ditto other answers, but I'd add there's a lot of psychology going on in a sale. If you're paying cash, you presumably have a pretty fixed upper limit on what you can spend. But if you're getting a loan, a large increase in the price of the car may sound like just a small addition to the monthly payment. Also, these days dealers often try to roll "extended warranties" into the loan payment. Most people can't calculate loan amortizations in their heads -- I'm pretty good at math, and I need a calculator to work it out, assuming I remember or wrote down the formula -- a dealer can often stick a piece of paper in front of you saying "Loan payment: $X per month" with fine print that says that includes $50 for the extended warranty, and most people would just say, "oh, okay".