The new deduction for qualifying vehicle loan interest sounds straightforward enough — until the taxpayer is self-employed and uses the vehicle for business.

In this episode of Accounting in the Wild, Jason Dinesen takes a practical look at how the new vehicle loan interest deduction works when a vehicle has both personal and business use.

A key issue is whether the vehicle qualifies as a personal-use vehicle in the first place. Under the final regulations, that determination is based on the taxpayer’s intended use at the time the vehicle is purchased. If the taxpayer intends to use the vehicle more than 50% for personal purposes, it can qualify even if the actual business-use percentage later turns out to be higher.

From there, self-employed taxpayers have some flexibility. Jason walks through the regulations’ examples showing how qualifying interest can potentially be deducted entirely on Schedule 1A or allocated between Schedule 1A and Schedule C based on actual business use.

The episode also explores an important wrinkle: the $10,000 limitation applies to the Schedule 1A deduction, not to the portion properly deducted on Schedule C. That can make allocation particularly important when the taxpayer has substantial vehicle-loan interest.

Topics include:

• What makes a vehicle a qualifying personal-use vehicle
• Why the taxpayer’s intent at the time of purchase matters
• What happens when actual business use differs from expected use
• Allocating interest between Schedule 1A and Schedule C
• How the $10,000 limitation interacts with business-use interest
• Practical examples from the final regulations

For tax professionals working with sole proprietors and other self-employed taxpayers, this episode breaks down an easily overlooked intersection between a new individual deduction and familiar business vehicle rules.