Mileage engineering
How do you split 2026 business mileage at the midyear IRS rate change?
For 2026, separate business miles into two date ranges: 72.5¢ per mile through June 30 and 76¢ per mile starting July 1.
For 2026, multiply eligible business miles driven from January 1 through June 30 by $0.725, then multiply July 1 through December 31 business miles by $0.76. Add the two amounts, keep a dated mileage record, and confirm that the standard-mileage method is available for the vehicle.
Which 2026 mileage rate applies to each date range?
The IRS lists two business rates for 2026: 72.5¢ per mile from January 1 through June 30, and 76¢ per mile from July 1 through December 31. The revised second-half rate took effect July 1, so a full-year worksheet must preserve the midyear boundary.
This is a date-based calculation, not an annual average. Applying 76¢ to all 2026 miles overstates the first-half amount; applying 72.5¢ to all miles understates the second half. Keep the actual trip dates or reliable half-year totals behind the summary.
Example: 7,200 eligible H1 miles × $0.725 = $5,220.00. 4,000 eligible H2 miles × $0.76 = $3,040.00. Together, those two periods produce an $8,260.00 mileage amount before separately allowable parking and tolls.
| Period | Business rate | Calculation |
|---|---|---|
| Jan. 1–Jun. 30, 2026 | $0.725 per mile | H1 business miles × $0.725 |
| Jul. 1–Dec. 31, 2026 | $0.76 per mile | H2 business miles × $0.76 |
| Full-year total | Two rates | H1 amount + H2 amount |
Sources: [1] Standard mileage rates · [2] Internal Revenue Bulletin 2026-29, Announcement 2026-11
How does the two-rate result flow to Schedule C?
For a sole proprietor using the standard-mileage method, the 2026 Schedule C instructions describe multiplying each period’s business miles by its applicable rate, then adding eligible parking fees and tolls to the Line 9 amount. Keep those add-ons distinct in the workpaper.
A rate worksheet should preserve the components rather than storing only one unexplained annual total. At minimum, record H1 miles, H2 miles, the rate applied to each, parking, tolls, and the resulting Line 9 amount. That makes the midyear calculation reviewable by a tax preparer.
The IRS’s 2026 Schedule C instructions were posted as a draft at the time this article was prepared. Tax4Gig is an organizer, not a filed return; a preparer should check the final instructions and the taxpayer’s facts before transferring amounts.
Mileage workpaper fields
- Business trip date, destination, and business purpose
- H1 and H2 business-mile totals kept separately
- Parking and toll receipts identified apart from mileage
- Annual total vehicle miles and personal/commuting miles when needed
- Vehicle method and first-year eligibility reviewed by the preparer
Sources: [3] Notice 2026-10 (initial 2026 mileage rate) · [4] 2026 Instructions for Schedule C (draft; not for filing) · [5] Publication 463, Travel, Gift, and Car Expenses
What mileage records should a contractor keep?
Keep a timely mileage log that can connect each claimed trip to its date, business purpose, destination, and distance, plus supporting vehicle records. A summary total is useful for review, but the underlying records are what help substantiate how that total was calculated.
Separate business travel from commuting and personal driving. A trip does not become business mileage simply because a contractor owns a business or uses a vehicle during the same day. Tax professionals should examine the trip purpose and applicable transportation rules.
Do not combine standard mileage with expenses that the chosen method already covers, such as fuel and ordinary repairs. The 2026 instructions identify specific items that may be treated separately, including business-use vehicle loan interest and personal property tax. Treatment depends on the vehicle, method, and current instructions.
Sources: [4] 2026 Instructions for Schedule C (draft; not for filing) · [5] Publication 463, Travel, Gift, and Car Expenses
How does Tax4Gig handle the 2026 mileage split?
Tax4Gig asks for first-half and second-half business miles separately, applies the two displayed 2026 rates in its estimate, and places the period calculations in the packet worksheet. It does not verify a log or determine whether a taxpayer is eligible to use the standard-mileage method.
The software design keeps the rate change explicit: H1 is January–June, H2 is July–December. A preparer can compare those figures with a mileage export or contemporaneous log, check the annual vehicle-use facts, and decide whether the standard-mileage or actual-cost method is appropriate.
That separation is tax engineering, not a substitute for source records. Keep the original mileage app export, calendar, dispatch history, or other evidence used to build the totals, and resolve inconsistencies before the figures are filed.
Sources: [1] Standard mileage rates · [4] 2026 Instructions for Schedule C (draft; not for filing) · [5] Publication 463, Travel, Gift, and Car Expenses
What else do tax preparers ask about mileage engineering?
What is the 2026 business mileage rate before July 1?
The 2026 business standard mileage rate was 72.5¢ per mile for eligible business miles driven January 1 through June 30, 2026.
What is the 2026 business mileage rate starting July 1?
The IRS revised the business standard mileage rate to 76¢ per mile beginning July 1, 2026, through December 31, 2026.
Can I use one average rate for all 2026 miles?
The IRS rates apply to separate date ranges. Calculate first-half miles at 72.5¢ and second-half miles at 76¢, then add the two period amounts.
Can I deduct gas in addition to standard mileage?
Generally, gas and ordinary vehicle operating costs are included in the standard-mileage method and should not be deducted again. Review the current IRS instructions for items that may be treated separately.
Does a Tax4Gig mileage total prove my deduction?
No. Tax4Gig organizes entered mileage totals; the contractor and tax preparer still need to review eligibility and retain records that substantiate the trips and business purpose.
IRS sources and references
- IRS — Standard mileage rates
- IRS — Internal Revenue Bulletin 2026-29, Announcement 2026-11
- IRS — Notice 2026-10 (initial 2026 mileage rate)
- IRS — 2026 Instructions for Schedule C (draft; not for filing)
- IRS — Publication 463, Travel, Gift, and Car Expenses
The 2026 Schedule C instructions linked where noted are an IRS draft marked “not for filing.” Confirm final instructions and current law before filing.