45 — Vehicle Available for Personal Use Updated for tax year 2025

What this line means

A yes-or-no question asking whether this vehicle was available for personal use during off-duty hours. If the vehicle was parked at your home and could have been used for personal errands, the answer is yes — even if you rarely used it personally. Most sole proprietors answer “yes” because their business vehicle is also their personal vehicle.

Does this apply to you?

• You complete Part IV for a vehicle used in your business
• You own or lease a vehicle that you use for both business and personal purposes
• You have a dedicated business vehicle that is stored at your home

Easy to overlook

“Available” does not mean “used” The question asks whether the vehicle was available for personal use, not whether you actually used it personally. A truck parked in your driveway overnight is available for personal use even if you never drive it on weekends. Only vehicles stored at a business location and truly inaccessible for personal use can honestly be marked “no.” ¹ [SOURCE: IRS Schedule C instructions — Part IV, Line 45]

Answering “no” sets a high bar for proof If you answer “no,” the IRS expects that the vehicle was kept at a business premises and was not taken home or used for any personal purpose. This is common for construction equipment or delivery trucks parked at a depot but rare for cars and pickups. An incorrect “no” answer undermines the credibility of your entire vehicle deduction. ² [SOURCE: IRS Publication 463 — Travel, Gift, and Car Expenses]

Watch out for this

Answering “no” for a vehicle you drive home every night. If the vehicle is at your residence during non-business hours, it is available for personal use. Answering “no” when the facts say otherwise is a misrepresentation that can trigger penalties if discovered in an audit.

Related lines on your return

• Line 44a — Schedule C — Business miles; the deductible portion of your driving
• Line 44c — Schedule C — Other miles; personal use that this question references
• Line 9 — Schedule C — Car and truck expenses; the deduction this information supports