Determining the Value of Donated Property. The appraisal must be made no more than 60 days before you donate the vehicle. You must receive the appraisal before the due date (including extensions) of the return on which you first claim a deduction for the vehicle. For a deduction first claimed on an amended return, the appraisal must be received before the date the amended return is filed. When you file your income tax return (Form 1040 or Form 1040X), you will need to complete Section B of Form 8283, and attach it to your return. .