As baldietax said, as it stands, your traditional IRAs will always have some basis in nondeductible traditional IRA contributions until the balance in all of your traditional IRAs is zero.
People in this situation often consider obtaining a return of the nondeductible contribution so that they don't have to track basis forever, or they roll the pre-tax portion of their IRAs into an employer plan like a 401(k), leaving just the basis in the traditional IRAs.
