California Mileage Tax Calculator: 2026 Rates, Methods, and Filing

To take a California mileage deduction for 2026, multiply your qualifying miles by the IRS standard rate that matches the trip’s purpose, then report the total on your California return. The 2026 rates are 72.5 cents per business mile, 20.5 cents per medical or moving mile, and 14 cents per charitable mile. The piece most Californians miss: the state never adopted the federal rule that stripped W-2 employees of the unreimbursed business-expense deduction, so if your employer doesn’t pay you back for work driving, you can still write off those miles on your state return even though you can’t on your federal one.

2026 Mileage Rates

California uses the same standard mileage rates the IRS publishes each December. For miles driven on or after January 1, 2026:

Business: 72.5 cents per mile, up from 70 cents in 2025. This figure covers depreciation, fuel, insurance, maintenance, and repairs.
Medical: 20.5 cents per mile, down half a cent from 2025.
Moving: 20.5 cents per mile. Federally this is limited to active-duty military and certain intelligence community members, but California still allows a moving deduction for any taxpayer who meets the distance and time tests.
Charitable: 14 cents per mile, a figure fixed by federal statute that doesn’t change year to year.

You can add parking fees and tolls paid during qualifying trips on top of the per-mile amount.¹

Who Can Claim Mileage in California

The Tax Cuts and Jobs Act suspended the federal deduction for unreimbursed employee business expenses from 2018 through 2025. Federally, only a few groups still qualify: Armed Forces reservists, qualified performing artists, fee-basis state or local government officials, and employees with impairment-related expenses.²

California did not conform. The Franchise Tax Board’s instructions for Schedule CA (540) state directly that “Under federal law, the deduction for miscellaneous itemized deductions subject to the 2% floor is suspended. California law does not conform.”³

So a nurse driving between patient homes, a sales rep visiting clients, or a construction worker commuting to temporary job sites can all claim unreimbursed business miles on a California return, even though the federal deduction is gone. The amount is subject to a 2% adjusted gross income floor, meaning only the portion of total miscellaneous itemized deductions above 2% of your AGI actually reduces your California tax.

If you’re self-employed or an independent contractor, the deduction works the same on both returns. You report business miles on Schedule C, and the result flows through to California without any state adjustment.

What Driving Actually Counts

The most common mistake is treating a commute as business travel. Driving from home to your regular workplace is personal, not deductible, no matter the distance. Both the IRS and California treat it that way.⁴

Trips that do qualify as business travel include:

Driving from one workplace to another on the same day.
Travel to meet a client, inspect a property, or perform services at a customer location.
Driving from home to a temporary work site when you have a regular office elsewhere. “Temporary” means a job realistically expected to last one year or less.
Travel to a business meeting held away from your regular workplace.

If you have no regular office and work in the same metro area where you live, daily trips to job sites within that metro area are commuting. Only trips outside the metro area count as business travel in that situation.⁴

Standard Rate or Actual Expenses

You have two ways to calculate the business-use deduction, and the choice matters.

The standard mileage rate is simpler. You multiply qualifying miles by 72.5 cents and add parking and tolls. You cannot separately deduct gas, insurance, repairs, or depreciation; those are already baked into the rate. This method tends to favor newer, fuel-efficient vehicles with low operating costs.⁵

The actual expense method requires you to track every dollar spent on the vehicle (gas, oil, tires, repairs, insurance, registration, depreciation, lease payments) and then multiply the total by your business-use percentage. If you drove 18,000 total miles with 12,000 for business, you’d deduct 66.7% of your actual costs. This method often produces a larger write-off for older vehicles, high-maintenance vehicles, or vehicles with expensive insurance, but it demands receipts for everything, not just a mileage log.⁵

One rule locks the choice down: if you want the standard rate for a car you own, you must pick it in the first year the vehicle is available for business. You can switch to actual expenses in a later year, but you cannot switch back to the standard rate on that same vehicle. For a leased car, whichever method you pick applies for the entire lease.

You also can’t use the standard rate if you operate five or more vehicles at the same time, previously claimed accelerated depreciation or a Section 179 deduction on the vehicle, or use the car for hire (taxi, rideshare).⁶

Running the Numbers

Here’s the math using the 2026 standard rates. Suppose you logged 15,000 business miles, 800 medical miles, and 200 charitable miles.

Business: 15,000 × $0.725 = $10,875
Medical: 800 × $0.205 = $164
Charitable: 200 × $0.14 = $28

Each category lands in a different place on your return. Business miles reduce income directly on Schedule C for the self-employed, or flow through Schedule CA (540) as an employee expense for W-2 workers. Medical miles join your other medical expenses and only help to the extent your total medical costs exceed 7.5% of adjusted gross income. Charitable miles are reported with your charitable contributions. Add parking and tolls from business trips on top of the business figure.²

Records You Need

Federal law requires you to substantiate vehicle expenses with records showing four things for each trip: the amount, the time and place, the business purpose, and the business relationship of anyone you visited. Without adequate records the entire deduction can be disallowed.⁷

A workable log captures:

Date of the trip.
Destination, including the name of the client, customer, or organization.
Business purpose in a short note.
Miles driven for that trip.

Record your odometer on January 1 and December 31 so you can establish total annual miles and split them cleanly between business and personal use. Keeping the log current rather than reconstructing it at tax time is the difference between a deduction that survives an audit and one that doesn’t. The FTB can request these records, and a 25% penalty applies when a taxpayer fails to provide requested information. GPS-based mileage apps generally satisfy the standard, though you still need to add the business purpose for each trip. Hold onto parking and toll receipts alongside the log.

Where It Goes on Your California Return

For self-employed filers, report business mileage on federal Schedule C. California conforms to the federal treatment of self-employment expenses, so no separate state adjustment is needed. The deduction flows into Form 540 automatically.⁸

For W-2 employees, this is where California’s non-conformity creates an extra step. Prepare federal Form 2106 using California amounts (following California law, not federal), then enter the result on Schedule CA (540), Part II, Line 19. Remember the 2% AGI floor on the total.³

One filing wrinkle for the self-employed: California’s free CalFile system disqualifies anyone claiming business or farming income on Schedule C, so if you’re deducting mileage as a sole proprietor or contractor, you’ll need commercial tax software or a paid preparer to e-file your state return.⁹

1
Internal Revenue Service. 2026 Standard Mileage Rates (Notice 2026-10)
2
Internal Revenue Service. IRS Sets 2026 Business Standard Mileage Rate at 72.5 Cents Per Mile
3
Franchise Tax Board. 2025 Instructions for Schedule CA (540) California Adjustments
4
Internal Revenue Service. Publication 463 – Travel, Gift, and Car Expenses
5
Internal Revenue Service. Car and Truck Expense Deduction Reminders
6
Internal Revenue Service. Topic No. 510 – Business Use of Car
7
Office of the Law Revision Counsel. 26 USC 274 – Disallowance of Certain Entertainment, Etc., Expenses
8
Franchise Tax Board. 2025 California Resident Income Tax Return
9
Franchise Tax Board. CalFile Qualifications 2025