What the IRS Actually Demands to Approve Your Mileage Deduction
Writing off vehicle expenses on IRS Form 1040 Schedule C Line 9 is one of the easiest ways for 1099 contractors and self-employed professionals to cut their tax bill. But if you get audited, a handwritten estimate on a napkin will get your deduction completely thrown out.
1. The 4 Mandatory Requirements for an IRS Audit
Under IRS tax law (IRC § 274(d)), your mileage log must prove four specific facts recorded contemporaneously: (1) The date of the drive, (2) Starting and ending locations / destinations, (3) Total mileage, and (4) The specific business purpose. VaultMileage validates all four before marking any drive complete.
2. Why Estimate Spreadsheets Get Rejected in Audits
When an auditor asks for your mileage records, they look for proof that the entries were made near the time of the drive, not typed into Excel the night before the audit. VaultMileage stores timestamped records on your phone that match real odometer readings.
3. Certified 1-Page Summary & Full Detail Ledgers
Export clean, high-resolution PDF summaries and detailed CSV ledgers in one tap. You can preview, print via AirPrint, or send the file directly to your CPA, TurboTax, or tax preparer without any manual calculations.
100% Private • Works offline • No subscription lock-in