Iowa Mileage and Vehicle Tax Records (2026): Federal Taxable Income, 3.8% Flat Rate, Six-Year TNC Records and Driverless Vehicles
General information, not tax or legal advice. Talk to your tax preparer or attorney about your situation.
Since 2023, Iowa starts from federal taxable income with rolling conformity, so a self-employed driver's federal mileage deduction carries over, and the rate is a flat 3.8%. Bonus depreciation applies for assets placed in service in tax years beginning in 2021 or later. Rideshare companies need a DOT permit, and driverless-capable vehicles may operate without a human driver.
Iowa now follows federal taxable income closely, which simplifies the state side of a mileage deduction. This guide covers what the Iowa Department of Revenue and the Iowa Code say as of October 16, 2026.
The federal baseline every Iowa driver starts from
Most vehicle deductions begin on your federal return. If you're self-employed, you can generally use the standard mileage rate or actual expenses for the business share of your car (IRS Topic 510). For 2026 the business rate is 72.5¢ per mile for January 1 to June 30 (IR-2025-128 / Notice 2026-10) and 76¢ per mile for July 1 to December 31 (IR-2026-29 / Announcement 2026-11) (IRS standard mileage rates). EVs use the same rates; see the 2026 EV mileage rate guide. Most employees can't deduct unreimbursed car expenses federally (Topic 510). IRS Publication 463 asks for each business trip's miles, date, destination and purpose, plus total miles. Commuting stays personal (commuting vs business miles).
How Iowa treats vehicle deductions
The Department of Revenue's conformity page says that for tax years beginning on or after January 1, 2023, the starting point is federal taxable income, and Iowa has adopted rolling conformity with the Internal Revenue Code. So a Schedule C vehicle deduction, figured with the standard mileage rate or actual costs, is already reflected. The 2025 IA 1040 expanded instructions say Iowa now has a flat rate of 3.8%.
Depreciation: bonus and Section 179
The department's additional information page says bonus depreciation is available for Iowa for assets placed in service in a tax year beginning on or after January 1, 2021. For tax years beginning on or after January 1, 2020, Section 179 limits and the phase-out threshold match federal. Older vehicles may still carry Iowa adjustments, figured on IA 4562A and B. Ask your preparer if you placed a vehicle in service before those dates. See robotaxi fleet depreciation and Section 179.
Rideshare (TNC) rules in Iowa
Iowa Code chapter 321N regulates TNCs. Under § 321N.2, a TNC can't operate without a permit from the Iowa Department of Transportation. It must keep records of each prearranged ride for at least six years and driver records for six years after a driver's activation ends. Section 321N.8 requires an electronic receipt after each ride, and § 321N.11 bars political subdivisions from regulating TNCs. Save your own trip receipts and annual summaries too. See which rideshare miles count.
Robotaxis and driverless vehicles in Iowa
Iowa's 2019 law (SF 302, 2019 Acts, ch 75) created Iowa Code §§ 321.514 to 321.519. Section 321.514 defines a driverless-capable vehicle and an on-demand driverless-capable vehicle network. Section 321.515 lets a driverless-capable vehicle operate on public highways without a conventional human driver if it meets conditions, including achieving a minimal risk condition after a system failure. Section 321.516 requires financial liability coverage, and § 321.518 lets a person operate an on-demand driverless-capable vehicle network for passengers or goods. Section 321.519 bars political subdivisions from adding requirements or taxes specific to these vehicles. For fleet records, see robotaxi fleet tax basics.
What to keep in your Iowa records
- Each business trip's date, start, destination, purpose and miles, plus total miles for the year (Pub 463); a weekly log counts as timely kept.
- Separate Business, Commute and Personal totals for Form 4562 Part V.
- Keep records until the period of limitations runs out, generally 3 years federally (IRS); ask your preparer about the state period.
- If you placed a vehicle in service before 2021: keep the IA 4562A and B adjustments with your depreciation schedule.
- For rideshare: download ride receipts and annual summaries for your federal Schedule C.
For the full list of log fields, see what the IRS asks you to record.
Example: 1,000 hypothetical business miles driven in September 2026 × 76¢ (IR-2026-29) = $760 at the federal standard rate. Miles driven in March 2026 would use 72.5¢ (IR-2025-128) instead, so keep each trip's date. Estimates, not tax advice.
One log for both returns
An Iowa return doesn't call for a second mileage log; your preparer works from the same business, commuting and personal miles. CyberDeduct builds a mileage log around IRS Pub 463 from your Tesla's own trip and odometer data (Model S, 3, X, Y and Cybertruck). You connect your Tesla account once through Tesla's standard account sign-in (OAuth); CyberDeduct never sees or stores your password. Home/work rules and route templates label most trips Business, Commute or Personal; you tap to change any label and confirm the purpose. The dashboard shows your business-use percentage and warns you on the 28th if you're under 50%. You export a PDF or CSV log plus a Form 4562 Part V worksheet for your preparer. See how the log is built or see plans.
Sources (checked October 16, 2026)
- Iowa Department of Revenue, 2025 IA 1040 expanded instructions
- Iowa Department of Revenue, Conformity with the IRC
- Iowa Department of Revenue, Note and additional information
- Iowa Code chapter 321N (2026)
- Iowa Code § 321.514
- Iowa Legislature, SF 302 (2019, enrolled)
- IRS, Standard mileage rates; IRS Publication 463; IRS Topic 510
Frequently asked questions
Does Iowa use my federal mileage deduction?
Generally yes. Since 2023, Iowa starts from federal taxable income, which already reflects Schedule C vehicle expenses.
Does Iowa allow bonus depreciation?
Yes, for assets placed in service in a tax year beginning on or after January 1, 2021, per the Department of Revenue.
What is Iowa's income tax rate?
The 2025 IA 1040 expanded instructions describe a flat 3.8% rate.
How long do Iowa TNCs keep ride records?
At least six years from the date of each prearranged ride, under Iowa Code § 321N.2.
Are driverless cars legal in Iowa?
Yes. Iowa Code § 321.515 lets driverless-capable vehicles operate without a conventional human driver if they meet its conditions, with financial liability coverage under § 321.516.
This article is general information, not tax or legal advice. Talk to your tax preparer or attorney about your situation. State laws and bill status change; check the linked sources for the current text.
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