We've created this stepbystep guide on everything you need to know about creating a donation receipt letter for tax purposes. The County Board of Supervisors accepts donations and gifts offered to the County for the use, benefit and advantage of the citizens of San Bernardino County.Toll Free Number: 1.888.4.GOODWILL. The taxpayer must request the SOV after making the charitable contribution but before filing a tax return itemizing the charitable deduction. Online Donation: You can fill out the form below to contribute online. 5. Donate a car to a nonprofit to support a charity of your choice. All vehicles are considered and your car donation is tax deductible. This booklet contains: Form 100S, California S Corporation. Plus, we come to you with free pick up and you get an amazing tax deduction! Car donation is a win-win!