Every 1,000 business miles you cannot document is $700 of deduction gone at the IRS business standard mileage rate of $0.70 per mile (IRS Notice 2025-05), and a deduction disallowed for lack of written evidence can carry the 20% accuracy-related penalty under IRC §6662. Eight cells in, four sheets out: your Schedule C line 44a/44b/44c split, your business-use percentage, and the tax those miles actually save.
| Total miles driven this year (odometer difference — the total in the Schedule C line 44 header) | - |
| Other and personal miles — Schedule C line 44c, filled in for you | - |
| Business-use percentage of the vehicle | - |
| Standard mileage deduction so far this year | - |
| Self-employment tax saved (SE tax applies to 92.35% of net earnings) | - |
| Income tax saved, net of the one-half SE tax deduction (IRC §164(f)) | - |
| Total tax these logged miles save you this year | - |
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Every 1,000 business miles you cannot document is $700 of deduction gone at the IRS business standard mileage rate of $0.70 per mile (IRS Notice 2025-05), and a deduction disallowed for lack
IRS Notice 2025-05 sets the 2025 business standard mileage rate at $0.70 per mile. Thirty documented business miles — one round trip across a metro area — is $21 of deduction, the one-time price of this workbook. The phone apps th
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