Tax Guide You Can Get More Mileage on Your Donation – Form 1098 C IRS Form 1098 C for the contribution of motor vehicles, boats, and airplanes This post from PDFfiller takes an in-depth look at IRS Form 1098 C for those who were ... Tax Guide Deductible Vehicle Donations: Form 1098-C This post was updated in April 2018 Beyond regular monetary donations, many charities will accept donations in the form of vehicles. In most circumstances, the IRS requires documentation of ...