*Loan,banking and credit>>>auto loan

Is the interest on an auto loan tax deductible?

Only if it is a business owned automobile.lol that is funny
No...it might if you can show that the vehicle is used for business.
If the vehicle is for personal use, the interest on the loan taken out against the vehicle is never deductible.

If the vehicle is used for business, and you are self-employed, then the percent of the interest attributable to business use is deductible on Schedule C.

If the vehicle is used for business, and you are an employee, the interest is not deductible.
used to be - not now. It was phased out in the1980s (I think). That includes credit card interest