I'm in CA, and received the offer letter last week. With a cash buyback they DO include sales tax....as well as in the interest portion of any payments. The usage fee was $2700 for about 9,800 miles on my 2019. In short, I got paid everything I paid (including tax fees and interest), MINUS the usage fee. Cash buyback. Drove home a 2021 Monday.My uncle just got the check for the buy-back of his 2018 Bolt Premium. He was originally going to do the MSRP swap but they didn't have the Traverse van but they had the terms ready. He says they work out to about the same. With the MSRP swap, GM covers the sales tax and license fee but only considers your purchase price in the swap. With the buy-back, GM doesn't pay for sales tax but pays for the interest you paid on your car loan. It doesn't sound like there's much difference in the usage fee, can someone confirm that?