Which Parts of Auto Insurance Are Tax‑Deductible? A 2018 Tax Guide

Understanding Deductible Auto Insurance Components for 2018 Taxes

For the 2018 tax year, only specific portions of an auto insurance premium could be deducted if the vehicle was used for business, self‑employment, or qualified medical travel. The deduction applies to the business use percentage of the premium, not the entire cost. If the vehicle is primarily used for personal reasons, no deduction is allowed. Below is a clear, step‑by‑step guide to help you determine what you can claim.

1. Which Auto Insurance Costs Are Eligible?

Business‑Related Insurance

The IRS allows a deduction for the portion of your auto insurance that is directly tied to business use. This includes:

• Liability coverage (bodily injury and property damage) used for business trips.
• Collision and comprehensive coverage if the vehicle is used for business purposes.
• Optional personal injury protection (PIP) or medical payments, if used in business contexts.

Medical Travel Deduction

Under IRS Section 162, insurance premiums for travel to medical appointments may be deductible if the trip is primarily for medical care and the vehicle is not used for personal reasons during that time.

2. Calculating the Deductible Portion

To find the deductible amount, follow these steps:

3. Documentation and Record‑Keeping Requirements

To support your deduction, keep:

• Insurance policy statements showing premium amounts.
• A detailed mileage log or business use log that justifies the percentage.
• Receipts or invoices for any additional coverage linked to business use.

4. Common Mistakes to Avoid

• Claiming the full premium for a vehicle used 50% for personal travel.
• Failing to separate personal and business use in logs.
• Not keeping receipts for supplemental coverage that may be deductible.

5. How the Rules Have Evolved Since 2018

While the core principle—deducting only the business portion—remains, recent tax reforms have tightened documentation requirements. The 2018 rules still apply to those who file prior returns, but new taxpayers should note:

• The 2020 Tax Cuts and Jobs Act did not change the deduction for auto insurance, but it clarified record‑keeping.
• Future changes may affect the treatment of medical travel insurance premiums.

6. Quick Reference Table for 2018 Deductible Auto Insurance