Form 1098-C: What Your Car Donation Is Worth on Your Tax Return

Everything here comes from the IRS Instructions for Form 1098-C, the form's donor instructions (Rev. April 2025) and Publication 4303, as of October 2026.

What decides your deduction: boxes 4 and 5

Box checked by the charity	What it means	Your deduction is generally
4a	Sold for more than $500 to an unrelated buyer at arm's length	The smaller of box 4c gross proceeds or fair market value
5a	The charity will use or materially improve it before any sale	Fair market value on the date you gave it
5b	It will go to a needy individual to further the charity's purpose	Fair market value on the date you gave it
Box 7 (claimed value $500 or less)	Copy C used only as an acknowledgment	Fair market value up to $500

Publication 4303 shows why box 4a matters. A donor values a car at $4,300; the charity sells it without using it and gets $3,700, so the deduction can't exceed $3,700. Had the charity certified it would use the car daily for a year to deliver food, the deduction could be the full $4,300 fair market value, as of October 2026.

Which vehicles count

A qualified vehicle is any motor vehicle made mainly for use on public roads, a boat or an airplane. Property held mainly for sale to customers, such as a dealer's inventory, isn't one. The charity reports the date it received the vehicle, the odometer reading for motor vehicles, the year, make and model, and the VIN, hull number or aircraft number.

The 30-day acknowledgment rule

For a vehicle with a claimed value over $500, the charity must give you a contemporaneous written acknowledgment, and Copy B of Form 1098-C can serve as that. It counts as contemporaneous if it reaches you within 30 days of the sale when box 4a applies, or within 30 days of the gift when box 5a or 5b applies. If no box is checked, you need it by your return's due date with extensions, or the date you file, if earlier.

No acknowledgment, no deduction above $500. The same applies if you don't give the charity your taxpayer identification number: it ticks box 7, and the deduction is limited to $500.

What to file with your return

1. Attach Copy B of Form 1098-C to your paper return.
2. If you e-file, attach Copy B to Form 8453 and mail it, or include it as a PDF if your software allows.
3. Attach Form 8283 as well if your deduction for all noncash gifts is more than $500.
4. Claim it as an itemized deduction on Schedule A of Form 1040, within the usual charitable deduction limits.

The IRS is blunt about step one: if Copy B isn't attached when it's required, it disallows the deduction.

What counts as a significant intervening use

Box 5a only applies if the charity uses the vehicle to substantially further its regular activities, and the use is significant, not incidental. The instructions give two examples: driving it every day for a year to deliver meals to needy people, or driving it 10,000 miles over a year for the same purpose. Using a car to teach marketing or sales skills doesn't count.

Rules on the charity's side

• The charity files a separate Form 1098-C with the IRS for each vehicle with a claimed value over $500.
• It can truncate your TIN on your copies, but not on what it files with the IRS.
• A knowingly false acknowledgment brings a penalty of the larger of the gross proceeds or the stated price times 39.6% for a box 4a sale, or the larger of $5,000 or the claimed value times 39.6% for box 5a or 5b, as of October 2026.
• A box 5a or 5b certification is presumed false if the vehicle is sold within 6 months to someone other than a needy individual without the use or improvement.
• Auction sales don't qualify for the needy individual exception, because they aren't significantly below fair market value.

Checking fair market value

When you're entitled to fair market value, Publication 4303 says a pricing guide must match the same make, model, year, condition and options, and the value can't exceed the guide's private-party sale price. Keep the printout with your records.

Repairs that don't make it a material improvement

A charity can also earn the fair market value treatment by materially improving the vehicle before selling it. That means major repairs or additions that significantly increase its value, and the donor can't fund them. Cleaning, minor repairs, routine maintenance, painting, dent or scratch removal, upholstery work and fitting a theft deterrent don't count.

The verdict

Before you hand over the keys, ask the charity what it plans to do with the vehicle. If it's going straight to auction, expect your deduction to be the sale price in box 4c, which is often well below the guide value. If it'll be used in the charity's work or given to someone in need, you can claim fair market value, but only with Copy B attached.

Frequently asked questions

What is Form 1098-C?

It's the form a charity uses to report a donated motor vehicle, boat or airplane with a claimed value of more than $500, and to acknowledge the gift to the donor.

How much can I deduct for a donated car?

If the charity sold it without significant use or improvement, generally the smaller of the gross proceeds in box 4c or the car's fair market value.

When should I receive Form 1098-C?

Generally within 30 days of the sale if box 4a is checked, or within 30 days of the donation if box 5a or 5b is checked.

Do I attach Form 1098-C to my tax return?

Yes. Copy B must be attached for a vehicle with a claimed value over $500, or attached to Form 8453 if you e-file, or the IRS disallows the deduction.

What if my donated car sold for $500 or less?

You can deduct the lesser of its fair market value or $500, with a written acknowledgment from the charity.

Do I need Form 8283 for a car donation?

Generally yes, if the amount you deduct for all noncash gifts is more than $500, unless an exception in the Form 8283 instructions applies.