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If I plan to buy a car in cash, should I let the dealer know?
In the UK at least, dealers definitely want you to take finance. They get benefits from the bank (which are not insubstantial) for doing this; these benefits translate directly to increased commission and internal rewards for the individual salesman. It's conceivable that the salesman will be less inclined to put himself out for you in any way by sweetening your deal as much as you'd like, if he's not going to get incentives out of it. Indeed, since he's taking a hit on his commission from you paying in cash, it's in his best interests to perhaps be firmer with you during price negotiation. So, will the salesman be frustrated with you if you choose to pay in cash? Yes, absolutely, though this may manifest in different ways. In some cases the dealer will offer to pay off the finance for you allowing you to pay directly in cash while the dealer still gets the bank referral reward, so that everyone wins. This is a behind-the-scenes secret in the industry which is not made public for obvious reasons (it's arguably verging on fraud). If the salesman likes you and trusts you then you may be able to get such an arrangement. If this does not seem likely to occur, I would not go out of my way to disclose that I am planning to pay with cash. That being said, you'll usually be asked very early on whether you are seeking to pay cash or credit (the salesman wants to know for the reasons outlined above) and there is little use lying about it when you're shortly going to have to come clean anyway.