The lender tax credits are on a month-to-month basis. Some months the lender provides them, some months they don’t. And even when they do, it’s not always on every vehicle within the brand. It may be targeted to one or a few different models, not the entire product portfolio. The amount of tax paid is also set by the lender. Some offer 100% sales tax credit, some make you pay a portion of the sales tax, i.e. 1%, 1.5%, etc.
I wish there was an easy way for this info to get out there but there really isn’t.