True, but you only pay taxes on the difference between the trade in value and the cost of the new car, since you already paid the sales tax on the trade in.
Not in every state.
[doublepost=1545226109][/doublepost]There's more money wasted in the IUP besides sales tax.
IUP is for people that don't want to pay full price up front and are willing to pay for the convenience of having a new iPhone every year without the "hassle" of selling the old one.
In IUP you are required (and are paying for) AppleCare+. Not everyone wants that expenditure.
As an example I'll use my iPhone X that I recently sold:
$1000 purchase price plus $70 tax
$1070 total
Sold it for $700 after 50 weeks of ownership (just shy of a year)
$700-$20(Swappa fee)-$20(PayPal fee)-$15(shipping fee)=$645
$1070-$645=$425 total cost of ownership for a year
IUP costs:
$84 tax up front
$49.91 per month x 12 months= $598.92
$84+$598.92=$682.92 total cost of ownership for a year
$682.92-$425 Difference between my iPhone X purchase and someone on IUP=$257.92 for one years use.
The little bit of effort to sell is well worth it
to me to save over $250.