A cairn is a small stack of stones used to mark a route. Each stone records progress and helps the next person stay on course.
Your mileage log serves the same purpose. Every dated trip, recorded mile, and documented business purpose creates a reliable trail for your books and your tax records.
As of 2026, business owners face an unusual change: the IRS has two business standard mileage rates for the same calendar year. The rate increases midway through the year, so your records must show when each trip occurred.
1. Know the 2026 standard mileage rates
The IRS initially set one 2026 business mileage rate. A later mid-year adjustment created two rates:
| Mileage period | 2026 business standard mileage rate |
|---|---|
| January 1–June 30, 2026 | 72.5 cents per mile |
| July 1–December 31, 2026 | 76 cents per mile |
The first rate comes from IRS Notice 2026-10. The second rate reflects the adjustment described in IRS Announcement 2026-11 and Internal Revenue Bulletin 2026-29.
The practical rule is simple: log business trips by date. Apply 72.5 cents to eligible business miles driven from January through June, and 76 cents to eligible business miles driven from July through December.
Do not apply one rate to the entire year unless your tax professional instructs you to do so under a specific, verified treatment. A single annual mileage total does not show which rate belongs to which miles.
The IRS standard mileage rates page is the best place to check the current official guidance and related limitations.
2. Understand what the standard mileage method does
The standard mileage method is an optional way to calculate vehicle costs related to eligible business use. Instead of tracking and allocating every actual vehicle expense, you multiply qualifying business miles by the applicable IRS rate.
The result is a mileage-based amount that may be used in place of actual vehicle expenses, subject to IRS eligibility rules and the taxpayer’s specific situation.
The standard mileage rate is not a payment automatically issued by the IRS. It is a calculation method. How it affects your tax return, owner reimbursement, or accounting records depends on your business structure, operating arrangement, and tax treatment.
It is important to note that not every vehicle or taxpayer can use the standard mileage method in every situation. For example, the IRS identifies circumstances involving prior depreciation under certain methods that can prevent use of the standard mileage rate. Vehicle ownership, leasing, depreciation history, and business use patterns can also affect the analysis.
For specific vehicle deduction questions, consult a qualified CPA or tax professional. LunaSi Accounting, LLC provides bookkeeping and financial organization support: not legal or tax advice.
3. Build a mileage log that supports the calculation
A mileage deduction starts with a record. The calculation comes later.
A useful mileage log captures enough detail to connect each trip to your business activity. At a minimum, record:
- Date of the trip
- Starting point
- Ending point
- Miles driven
- Business purpose
- Optional notes, such as the customer, project, job, or appointment
The date matters more than usual in 2026 because the applicable rate changes on July 1.
A weak record might say:
“Business driving : 125 miles”
A stronger record might say:
“June 18, 2026 : office to client location in Pasadena, client implementation meeting : 34 miles.”
That detail makes the entry easier to review months later. It also helps separate business travel from personal driving when you reconcile your vehicle records.
Contemporaneous records are the practical standard to follow. Record the trip as close to the date of travel as possible rather than reconstructing six months of mileage from memory.
A paper log can work. So can a spreadsheet or mileage-tracking app. The tool matters less than consistent use and the ability to preserve the underlying information.
Action plan:
- Choose one mileage-recording method.
- Enter trips on the same day whenever possible.
- Tag each trip as business or personal.
- Include a specific purpose rather than a generic label.
- Review the log weekly for missing dates or unusual totals.
4. Separate mileage tracking from expense tracking
Mileage and vehicle expenses are related, but they are not the same record.
Your mileage log shows how far you drove for business and why. Your bookkeeping system records related transactions, such as fuel, parking, tolls, repairs, insurance, lease payments, or vehicle purchases.
If you use the standard mileage method, some actual vehicle costs may not be treated the same way as they would under the actual expense method. Parking fees and tolls may require separate treatment, while other costs may be included or excluded depending on the applicable rules and your specific facts.
Do not assume that a mileage log by itself captures every vehicle-related cost. Keep receipts and supporting documents in your accounting system, even when you are evaluating the standard mileage method.
A clean process looks like this:
- Record each eligible business trip by date and mileage.
- Save receipts for vehicle-related expenses separately.
- Reconcile the mileage log to your calendar, route history, or job schedule.
- Review the vehicle method with your tax professional.
- Record the final bookkeeping treatment consistently.
This separation gives you flexibility. Your tax professional can evaluate the appropriate method using complete information, while your books retain the source records needed for review.
5. Calculate the 2026 amount correctly
Consider a business owner who drives 1,000 business miles per month throughout 2026.
For the first half of the year:
- January through June: 6,000 miles
- 6,000 miles × $0.725 = $4,350
For the second half:
- July through December: 6,000 miles
- 6,000 miles × $0.76 = $4,560
Total potential mileage-based amount for 2026:
- $4,350 + $4,560 = $8,910
The calculation is straightforward because the owner tracks miles by month. The same process works with irregular travel.
For example, a service company records:
- 840 eligible business miles from January 1 through June 30
- 1,125 eligible business miles from July 1 through December 31
The calculation would be:
- 840 × $0.725 = $609.00
- 1,125 × $0.76 = $855.00
- Total = $1,464.00
The rate applies to miles driven during each period: not necessarily the date you enter the expense into your accounting software.
That distinction matters during month-end close. A July entry may include a June trip, and a January bookkeeping entry may include a December reimbursement. Preserve the actual travel date so the rate is applied to the correct period.
Weekly habit:
- Total business miles by week.
- Review trips against your calendar and customer schedule.
- Flag unusually high or low mileage.
- Check that June and July trips are separated correctly.
- Attach supporting notes before the month closes.
6. What Business Owners Should Do Now
Your 2026 mileage process does not need to be complicated. It needs to be repeatable.
Start by reviewing every business trip since January 1. If your records currently combine all 2026 miles into one number, separate the total into two periods:
- January 1 through June 30
- July 1 through December 31
Next, check whether each trip includes a date, mileage, starting point, ending point, and business purpose. Fill gaps using reliable business records such as calendars, appointment systems, route histories, dispatch records, or client schedules: but avoid guessing where the underlying information cannot support the entry.
Then create a monthly review process. A 15-minute review at the end of each month can identify missing trips before the details disappear.
Your operating checklist:
- Confirm which vehicle or vehicles are used for business.
- Preserve odometer or mileage records when available.
- Record every business trip by date.
- Separate personal and business use.
- Save vehicle-related receipts.
- Apply 72.5 cents to eligible miles through June 30.
- Apply 76 cents to eligible miles from July 1 onward.
- Ask a qualified tax professional whether the standard mileage method is available for your situation.
- Keep the documentation with your accounting records.
LunaSi Accounting, LLC can help you keep mileage and expense records organized alongside monthly bookkeeping, account reconciliations, month-end close, and financial reporting. A consistent process makes it easier to review costs, explain business activity, and prepare organized records for your CPA or tax professional.
Getting Started: Choose one tracking system today and enter your next business trip before the day ends. By the end of the quarter, you can be operating from a complete mileage trail instead of reconstructing travel from memory: fast, reliable, and clear.
For practical bookkeeping support, contact LunaSi Accounting or review our accounting and bookkeeping services.
For official rate information, refer to the IRS standard mileage rates page.
31.08.2026
This content is for general informational purposes and is not legal, tax, or accounting advice. Consult a qualified professional for your specific situation.