You will enter your vehicle donation on Form 8283. Depending on how much the organization sold your vehicle for(Or the cars fair market value), you will fill out either section A or section B of Form 8283.

For donating your vehicle you will receive a Form 1098-C(Or receipt) from the charitable organization that has the sale info on it. 
Below is a guide on how you can enter the car donation. Hope this helps!

You will enter your vehicle donation on Form 8283. Depending on how much the organization sold your vehicle for(Or the cars fair market value), you will fill out either section A or section B of Form 8283.

For donating your vehicle you will receive a Form 1098-C(Or receipt) from the charitable organization that has the sale info on it. 

To enter your vehicle donation:

1. Select "Federal Taxes" at the top of the page

2. Select the "Deductions & Credits" sub-tab

3. Scroll down to "Charitable Donations" and select "Show More"

4. Select "Start" next to "Donations to Charity in 2016"

5. Continue to answer the questions in the interview accordingly

Select the links below for useful information on claiming donated vehicles:

Estimating your donated vehicle value

How tax deductions work for donated vehicles