Say you want to buy a new car with a MSRP of $20,000.
And you have a car with a book trade-in value of $5,000.
You'd pay a net of $15,000 going in.
I may say, take my trade-in plus $12,000 for that new car. A $3,000 bargain.
You could say that is $2,000 off of the new car and $1,000 more than your trade is worth.
Or vice versa, who cares.
Now let's view a separate negotiation.
You get them to knock $2,500 off of the new car. Sounds great.
Now try to get them to pay $6,000 for your trade-in.
But with if they won't budge from $5,000 after you have agreed to buy the new car?
That would be a net cost of $12,500. Worse than the combo deal I first explained.
If they go for the $6,000, then you're ahead.
But why would they over pay for your trade-in?
They are making their money from the new car. They don't make much off of trade-ins.
Even if you think you are negotiating one thing at a time, it's really a package deal because you don't sign real paperwork until all parts have been agreed upon.
I have never seen someone sign the paperwork on a new car and do separate paperwork for a trade-in at the same place and same day.