Two Gig Drivers, One Car: Splitting the Mileage

You dash weekday lunches. Your spouse drives Uber on Friday and Saturday nights. There's one car, one set of keys, and now one question as the year winds down: whose miles are whose, and does it matter if they all go on one return?

Why it's two Schedule Cs, not one

If you each signed up for your own account, you each run your own small business, even if you file jointly. Three things follow from that:

• The 1099s already split it. DoorDash, Uber, Instacart and the rest report your pay under the tax ID on your account. Your income goes on your Schedule C; your spouse's goes on theirs.
• Self-employment tax is per person. The Schedule SE instructions say it plainly: "If both spouses have self-employment income, each must file a separate Schedule SE." Each of you pays it once your own net earnings reach $400.
• Social Security credit follows the return it's on. If you fold your spouse's gig onto your Schedule C "to keep it simple," you also move their earnings record onto yours. Self-employment tax for gig drivers explains what that 15.3% buys.

The mileage deduction then belongs to whichever business the miles served. Your miles reduce your profit; theirs reduce theirs.

The car is shared. The miles aren't.

Think of the odometer as one pie cut into three kinds of slices: your gig miles, your spouse's gig miles, and everything else (school runs, groceries, visiting family, commuting). Each Schedule C gets exactly one slice.

IRS Publication 463 says this outright, even if it's written for depreciation: "Don't treat any use of your car by another person as use in your trade or business" unless it's directly connected with your business, reported as income to them, or paid for at fair rent. Your spouse's Uber Friday isn't connected to your DoorDash business, so it's not your business use.

A worked year

Maria delivers for DoorDash on her account. Jay drives for Uber on his. They share a 2021 Corolla. The odometer read 41,200 on January 1 and 63,700 on December 31: 22,500 miles total.

The check that matters: 9,000 + 6,000 + 7,500 = 22,500. If your two logs plus your personal driving add up to more than the odometer moved, a drive got counted twice. If they add up to a lot less, some drives are missing from somebody's log.

Schedule C line 44 when two people drive the car

Part IV of Schedule C asks: "Of the total number of miles you drove your vehicle during 2025, enter the number of miles you used your vehicle for: a Business b Commuting c Other." (The 2026 form isn't out yet; this is the 2025 wording.) The form doesn't mention a car with two drivers.

A consistent way to fill it in: both returns use the car's full-year total from the odometer, line 44a shows only that spouse's business miles, and everything else goes in commuting or other. For Maria that's 9,000 business and 13,500 other. For Jay it's 6,000 business and 16,500 other. Both add to 22,500, and neither return claims the other's miles. Tell your preparer the car is shared so the two returns tell the same story.

Line 46 asks, "Do you (or your spouse) have another vehicle available for personal use?" If the Corolla is the only car, the honest answer is no, and that makes a clean personal-miles slice even more important. Schedule C car expenses for gig drivers walks through the rest of Part IV.

Four ways couples double-count

• Both phones logged the same drive. If you both run a mileage app and ride together, both phones may record the trip. Only the person working that drive keeps it as business; the passenger marks it personal.
• Both apps were on. One of you had DoorDash and Uber open at once, and your spouse logged a drive too. A physical mile is counted once, on the log of the person working it. Multi-app tracking without double-counting covers the one-driver version of this.
• The ride-along helper. You hold the bags while your spouse drives a stacked order. Those miles belong to the account the orders were on, not to you. If you really work one account together, the income and miles go on the account holder's Schedule C. The IRS generally treats a business a married couple jointly owns and operates as a partnership unless they make the qualified joint venture election. Whether helping out makes it a joint business is a question for a preparer, not a log.
• The handoff drive. Driving home so your spouse can take the car out isn't business for either of you. The usual commuting rules apply to each of you separately; what counts as a business mile has the details.

If you use actual expenses instead

Gas, insurance, repairs and depreciation are paid once for one car, so they get split by miles. Publication 463: "If you use your car for more than one purpose during the tax year, you must allocate the use to the various purposes. You do this on the basis of mileage." With Maria and Jay's numbers, Maria could take 40% of the car's costs (9,000 ÷ 22,500) and Jay 26.7% (6,000 ÷ 22,500). The other third is personal and nobody deducts it. Together the two returns should never claim more than 66.7% of anything.

Pick one method for the car together. For a car you own, Publication 463 says the standard rate has to be chosen "in the first year the car is available for use in your business," and claiming accelerated depreciation or Section 179 on the car rules it out later. Two spouses pulling the same car in two directions is how that goes wrong. Standard mileage vs. actual expenses has the full comparison.

What each of you should keep

• Your own trip log. Date, where you went, the business purpose and the miles, kept "at or near the time," which Publication 463 says can mean a weekly log. IRS mileage log requirements has the full list.
• Your own platform records. Your 1099 and your app's annual summary. They're a cross-check, not a substitute for a log.
• The shared odometer readings for January 1 and December 31, plus the car's purchase or lease papers in case you ever sell it. Odometer photos for your mileage log shows what to capture.

Where TaxMiles fits, and where it doesn't

We make TaxMiles, so weigh this accordingly.

• It's one person per phone. Each of you runs TaxMiles on your own iPhone and gets your own log and your own totals. There's no shared household account and no way to merge two people's logs into one report.
• Your phone can't tell who's driving. When you ride along, your phone may detect the drive too. Mark it Personal or delete it on the passenger's phone.
• Add the same car on both phones. Each of you can add the Corolla under Vehicles and log your trips against it. Its Odometer Log (Taxes → Tax Toolkit) takes Year Start and Year End readings with a dashboard photo. It isn't a Pro feature.
• It applies the right rate by date. Trips before July 1, 2026 use 72.5¢ and trips after use 76¢, so each of you sees your own deduction without splitting the year by hand.
• It doesn't fill in line 44 for a shared car. Your report shows your business miles. The car's total for the year comes from the odometer readings, and splitting the rest is yours and your preparer's call.
• The free plan covers each person's first 40 business trips in total. Exports (PDF, CSV and the accountant formats) are part of Pro, which is $7.99 a month or $59.99 a year. There's no family plan, so if you both want Pro, you each need your own subscription.

Frequently asked questions

My spouse and I both drive for DoorDash or Uber in the same car. Who claims the mileage?

Each of you claims only the miles you drove for your own gig account, on your own Schedule C. The car's total miles are shared; the business miles are not. Added together, your two business-mile figures can never be more than the miles on the odometer.

Can we put all the gig income and miles on one Schedule C to keep it simple?

Not if you each have your own gig account. Each 1099 is issued under the account holder's tax ID, self-employment income belongs to the spouse who earned it, and the IRS says that if both spouses have self-employment income, each must file a separate Schedule SE. Moving one spouse's income onto the other's return also moves the Social Security credit.

What do we put on Schedule C line 44 if two people drive the car?

The form does not address two drivers. A consistent approach is for both returns to use the car's total miles for the year from the odometer, with line 44a showing only that spouse's business miles and the rest, including the other spouse's gig miles, in commuting or other. Tell your preparer the car is shared so the two returns agree.

If I ride along while my spouse delivers, are those my business miles?

No. The miles belong to the account the deliveries were made on. If you both work one account together, the income and the miles go on that account holder's Schedule C. Whether helping turns it into a jointly run business is a question for a tax preparer.

Can one of us use the standard mileage rate and the other use actual expenses on the same car?

IRS rules tie the standard mileage choice to the car: for a car you own, you must use the standard rate in the first year the car is used in business to keep it available later, and claiming certain depreciation on the car rules it out. Mixing methods on one shared car invites conflicts, so pick one method together and check it with a preparer.

Sources: IRS standard mileage rates (72.5¢ January 1–June 30, 2026, IR-2025-128; 76¢ July 1–December 31, 2026, IR-2026-29); IRS Instructions for Schedule SE (each spouse with self-employment income files a separate Schedule SE; $400 threshold; community income belongs to the spouse who carried on the business); IRS Publication 463 (use of your car by another person; allocating use by mileage; choosing the standard mileage rate; timely kept records); IRS Schedule C (2025) Part IV lines 44–47 and its instructions (business owned and operated by spouses); IRS Election for married couples unincorporated businesses (partnership default; qualified joint venture). Checked October 25, 2026.

This article is general information for US federal income tax, not tax or legal advice. The example is simplified: one owned car, standard mileage rate, a joint return, and each spouse working only their own gig account. Community property states have their own rules for dividing income between spouses. TaxMiles is published by Gigabyte LLC, the company that wrote this article.