Who is talking, and what this is not. This how-to lives on the TaxMiles site for TaxMiles: Mileage Tracker, App Store id 6758579463 — not MileIQ, not Everlance, and not the separately listed app “Mileage Tracker for Taxes” (id 6758426140). It is general tax education and a record-keeping worksheet, not tax advice and not a promise of any deduction. Two cars do not create two deductions for the same road. One physical mile is still one mile, on one odometer.

The search is usually some version of: I bought a used car in July. I still have the old one. Or I use the Civic for DoorDash and the SUV for Instacart. How do I not wreck the mileage log? That is a per-vehicle problem — not a rate-split explainer, not a platform tax guide, and not a true-hourly worksheet. Publication 463 and Schedule C Part IV care which VIN moved. A blended household total does not answer the form.

The relief is a file you can hand a CPA in March: one contemporaneous log per car, a method election that belongs to that car, 2026’s two rates stamped from the trip date, and Part IV (or Form 4562) answers that match the odometers. You do not need a fleet department. You need to stop pouring two dashboards into one spreadsheet column.

The short version: list each vehicle and the dates it was in business use. Keep the five IRS fields plus total miles on that odometer. Elect standard mileage or actual expenses per car — not per household. Apply 72.5¢ through June 30 and 76¢ from July 1 by the date of the drive on that car. Close a sold car on the sale date. Open a July purchase as a new in-service date. Do not merge two cars into one Part IV line.

Evidence note (qualitative only — no GSC). We do not have Google Search Console or analytics for this topic and do not invent clicks, rankings, impressions, or traffic. The page exists because the live blog already covers the 72.5¢ / 76¢ split, the five-field log, odometer photos, Schedule C Line 9 / Part IV, and basis when you sell — and there is still no dedicated worksheet for two odometers, a mid-year purchase, a loaner week, or a spouse’s car. TaxMiles can store more than one vehicle and keep per-vehicle readings (Pro). The outcome is a log that still works when the driveway has two cars, not a scoreboard.

Step 1: Inventory each vehicle and the dates it was in business use

Open a note. One row per car you actually used for the gig this year — including the one you sold, the one you bought in July, and the one you only drove on Saturdays.

Write down Why it matters
Year, make, model Part IV / Form 4562 identify a vehicle, not “the household car.”
Own, lease, or neither Standard mileage is for a car you own or lease. A borrowed or weekend-rental car is a different rule (Step 5).
Date placed in service for this business First day this car did business miles. A July 12 purchase is not January 1.
Date taken out of service (sale, trade-in, parked for good) Closes that log. Basis math starts from this date if you sell; see selling after the mileage deduction.
Odometer on those two dates Total miles on that car for the period it was in the business. Not the other car’s dashboard.

A Civic you sold on June 20 and a Corolla you bought on July 12 are two vehicles. The Corolla does not inherit the Civic’s year-to-date miles, its method election, or its first-half rate bucket. Treating them as one “car I use for DoorDash” is how Part IV and the first-year lock-in both go wrong.

What this step is not: listing every car you have ever owned. If a car never did a business mile in 2026, it is not on this worksheet. If you have a grocery-only car that never ran a gig, it still matters for the Part IV question “another vehicle available for personal use” — write it in the margin, not as a second Line 9.

Step 2: One log per odometer — five fields, plus which car

The IRS still wants, at or near the time of the trip: date, destination or route, business purpose, miles, and a way to show total miles on that vehicle so business-use percentage is checkable. Two cars means two denominators. The habit is in how to keep an IRS-ready mileage log and what a log has to show.

Add one field the one-car guides skip: which vehicle. A purpose sentence that says “DoorDash, store to customer” on the wrong car is a row you cannot defend. Same-day classification still matters. A year-end guess that “the SUV did the grocery batches” is a reconstruction, and cars are listed property — Cohan-style estimates do not rescue the vehicle deduction.

Practical order:

  1. Keep one GPS or written log stream per car, or one tracker that tags every trip with a vehicle. Do not keep one blob labeled “work miles.”
  2. Classify business vs commuting vs personal on that car the same day. Home-to-first-pickup is usually commuting unless a real home office changes it; the rule is in what counts as a business mile.
  3. Photograph that odometer at year start (or in-service), sale, and year end. Two cars, two photo sets. How: odometer photo log.
  4. If Uber and DoorDash were both open, count the physical mile once, on the car that drove it. Platform weekly totals are a checksum, not a second log. Reconcile: multi-app without double-counting.

Business-use percentage is business miles ÷ total miles on that vehicle for the period it was in service. Adding Civic miles to Corolla miles and dividing by “what I think I drove” invents a car the DMV does not know about.

Step 3: Elect a method per vehicle — not per household

Standard mileage and actual expenses are chosen per car. You can run 76¢ on the high-mile gig hatchback and actual expenses on a low-mile leased SUV. You cannot run both methods on the same car in the same year. Gas and insurance are already inside the standard rate on that car; they do not also sit on Line 9. Parking and tolls on work trips can still stack.

Situation What the election attaches to
Owned car, first year in the business Use standard mileage this year if you want to keep the option later. Start with actual expenses plus accelerated depreciation and the standard rate is generally off the table for that car.
Owned car, later year If year one was standard, you may switch to actual later (straight-line depreciation on remaining basis). The other car’s method does not move with you.
Leased car First-year choice locks for the entire lease, renewals included. A second owned car can still be on the other method.
Two owned cars, same year Two elections. Mixing methods across cars is allowed. Mixing methods on one car is not.
Five or more cars used at the same time Publication 463 treats that as a fleet. Standard mileage is generally not allowed. Two cars, one driver, one at a time, is not a fleet.

A mid-year purchase is a new first year for the new car. The Civic you ran on standard mileage from January through June does not decide the Corolla’s July election. Run both methods on paper for the new car before you lock it; the comparison is in standard mileage vs actual expenses. TaxMiles has Compare Methods under Taxes → Tax Toolkit — it still needs miles tagged to the right vehicle.

Step 4: Stamp 72.5¢ and 76¢ by trip date, on each log

2026 business standard mileage rates (Notice 2026-10 / Announcement 2026-11):

The rate follows the road date on that car. A June 18 Civic trip you export in September is still 72.5¢. A July 12 Corolla trip is 76¢. You do not get to move Civic June miles onto the Corolla to “catch the 76.” You do not apply one household rate to a blended mile total. How the year splits in one log: how to apply the 2026 rate change.

Illustration only — not a typical result, not a promise, not an average:

Line Civic (sold June 20) Corolla (in service July 12)
Business miles Jan 1–Jun 30 4,200 × 72.5¢ = $3,045 — (not in service)
Business miles Jul 1–Dec 31 — (sold) 2,400 × 76¢ = $1,824
Standard-mileage piece $3,045 $1,824
Combined Line 9-area mileage $4,869, plus allowed extras on each car (parking, tolls, business share of loan interest)

Wrong math that looks official: (4,200 + 2,400) × 76¢ = $5,016. That invents 4,200 miles at the second-half rate on a car that was already sold. Wrong math that looks conservative: dump both business totals into one Part IV and pick one odometer for “total miles.” Either error is enough to pull the percentage.

If a car was in service across the June 30 cut, that car has two halves. If it was not, do not create a first half for it.

Step 5: Sale, purchase, loaner, rental, spouse — do not blend

These are the cases that turn a clean two-car year into one ugly column.

You sold or traded the gig car

Photograph the odometer at the sale. Export that car’s log through the sale date. Standard mileage already reduced basis by the depreciation built into the rate; gain or loss is measured against adjusted basis, not what you paid in 2023. Walkthrough: selling your car after the mileage deduction. The replacement car starts a new basis and a new election.

You bought or began using a car mid-year

Placed-in-service date is the bookend, not January 1. Part IV asks for that date. The first photo and the first business trip should agree. Keep the dealer paperwork. If 2026 is this car’s first business year, decide standard vs actual before you treat every fill-up as a deduction — that choice can lock the car.

Shop loaner for a few days

You do not own or lease the loaner. Do not invent standard mileage on it as if it were a third personal vehicle. Note the dates your car was in the shop so that car’s total miles for the year stay honest. If you paid for fuel in the loaner for business hops, that is an actual cost you incurred — keep the receipt and the purpose note. Do not also claim 76¢ on those same loaner miles.

Weekend rental (Hertz, Avis, a stadium surge)

A short-term rental is usually the business portion of the rental bill plus the gas you bought, not a second standard-mileage automobile you add to Line 9 at 76¢ and the rental fee. Do not double it. If the rental was mixed personal and gig, allocate. The miles still belong in a note so you do not later call them miles on your own odometer.

Spouse’s car, or a car titled in one name

If you file a joint return and the household owns the car, standard mileage is generally available if you have a log on that vehicle. Title in one spouse’s name is not the usual blocker. Borrowing a friend’s car is different: you typically do not own or lease it, so the standard rate is the wrong tool. Deduct actual costs you paid for the business use, and write which car it was.

You drove both cars on the same day

Switch the vehicle tag when you switch keys. The default car in an app will happily assign the evening Instacart batch to the Civic you left in the driveway. That is a classification error, not a GPS error.

Step 6: Part IV is one-car shaped — attach the second

On the current Schedule C, if you take car expenses on Line 9 and you are not required to file Form 4562, you complete Part IV: date placed in service; miles for business, commuting, and other; whether the car was available for personal use; whether you have another vehicle for personal use; and whether you have written evidence. Those answers have to match one odometer. Line numbers: how to claim car expenses on Schedule C.

Part IV does not have a comfortable second car. Software either:

You typically do not file Form 4562 just because you used standard mileage on two cars and have no other depreciable property. You do still give the IRS the Part IV facts for each vehicle. Do not average two odometers into one “total miles” box. Do not answer “no other vehicle for personal use” if a second household car did the school run. A 98% business-use claim next to a family driveway is how the log fails the smell test.

Export in a way a CPA can split: CSV with a vehicle column, or two PDFs. A single household total is not that file. How to pack the handoff: export your mileage log for your CPA.

How TaxMiles keeps two cars from becoming one column

Features as proof, not as the lede. TaxMiles: Mileage Tracker (id 6758579463) auto-detects drives on iPhone and applies 72.5¢ or 76¢ by trip date. Under Settings → Vehicles you add each car (name, make, model, year), set a default for new trips, and assign a trip to the car you actually drove. Odometer readings are stored per vehicle. Taxes → Tax Toolkit → Vehicle Basis tracks purchase/lease facts per car so a sale later is not a guess. Per-vehicle reports are the point of the Vehicles screen.

The app assigns new trips to the default vehicle. It does not magically know you grabbed the SUV. When you switch cars, switch the vehicle on the trip the same day you classify purpose. That is the two-car version of contemporaneous.

Multi-vehicle tracking is Pro. Free is auto-detect and swipe classification for 40 automatic trips a month, no credit card. A two-car, multi-app week will blow past 40; that is a volume gate. Pro is $5.99/month, $39.99/year, or $79.99 lifetime, with a 7-day trial on the subscriptions — unlimited trips, multi-vehicle, CPA PDF/CSV export, history import. Buy it because you will actually tag the second car, not because a blog post told you to. If you are under 40 automatic trips a month, Free can still hold one default car; the second car then needs a written log or a later Pro import you should not postpone until April.

Who this worksheet — and TaxMiles — is not for

Two cars. Two logs. One rate stamp per trip.

TaxMiles: Mileage Tracker, App Store id 6758579463. Auto-detect on Free (40 trips / month). Pro adds multi-vehicle, per-vehicle odometer and reports, Vehicle Basis, and CPA export — $5.99/month, $39.99/year, or $79.99 lifetime. Not MileIQ. Not Everlance.

Download TaxMiles on the App Store

Frequently Asked Questions

Can I use the standard mileage rate on two cars in the same year?

Yes, if you own or lease each car and you are not using five or more vehicles at the same time. Keep a separate log and a separate election for each. Two cars, one driver, one at a time, is not a fleet.

Do I need two mileage logs if I buy a car in July?

Yes. Close the old car on the sale or park date. Open the new car on the in-service date with its own odometer bookends and its own first-year election. Do not continue the old mile total onto the new VIN.

Which 2026 IRS mileage rate applies if I switch cars mid-year?

The rate on the date of the drive, on that car: 72.5¢ through June 30, 76¢ from July 1. A June trip on the old car does not become 76¢ because you bought a new car in July.

Does TaxMiles track mileage for more than one vehicle?

Yes. Settings → Vehicles: add cars, set a default, assign trips, keep per-vehicle odometer readings and reports. Vehicle Basis lives in the Tax Toolkit. Multi-vehicle is Pro. Free: 40 automatic trips a month. Pro: $5.99/mo, $39.99/yr, or $79.99 lifetime.

Can I use standard mileage on one car and actual expenses on the other?

Yes. The method is per vehicle. Both methods on the same car in the same year is the mistake. First-year and lease lock-in rules still attach to each car separately.

What if I used a rental or a shop loaner?

Those are usually actual costs you paid (rental fee, fuel), allocated to business use — not a second standard-mileage vehicle stacked on top of the receipt. Keep the dates so your own car’s total miles stay honest.

Related reading: IRS-ready mileage log, odometer photo log, 2026 rate change (72.5¢, then 76¢), standard vs actual, Schedule C car expenses, selling after mileage, CPA export, what counts as a business mile, and multi-app without double-counting.

This article is general tax education for U.S. federal Schedule C filers, not legal, tax, or accounting advice and not a guarantee of any deduction or of any audit outcome. Worked figures are illustrations only. Publication 463, Treas. Reg. 1.274-5T, IRC 274(d), Schedule C / Form 4562 instructions, and IRS mileage rates can change; confirm Notice 2026-10, Announcement 2026-11, and the current forms, or work with a licensed professional. We do not have Google Search Console or analytics for this topic and do not report traffic, rankings, or impressions. TaxMiles: Mileage Tracker (App Store id 6758579463) is not affiliated with the IRS, Apple, Uber, Lyft, DoorDash, Instacart, MileIQ, or Everlance, and is not Mileage Tracker for Taxes (id 6758426140). Feature gates and prices are the current Free / Pro / Lifetime plans on taxmilesapp.com as of September 12, 2026, and can change.