# Schedule C Line 9: Car and Truck Expenses & Part IV Guide (2026–2027)

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- **Summary:** How to fill out Schedule C Line 9 (Car and Truck Expenses) and Part IV (Lines 43–47b) for 2026–2027: 72.5¢ standard mileage vs actual expenses, plus Form 4562.

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# Schedule C Line 9: Car and Truck Expenses & Part IV Guide (2026–2027)

**Short answer: Schedule C Line 9 (Car and Truck Expenses) is where sole proprietors, 1099 contractors, and single-member LLCs deduct the business use of a vehicle using either the IRS standard mileage rate (72.5 cents per mile for the 2026 tax year) plus business parking and tolls, or the actual expense method (business percentage of gas, insurance, repairs, tires, and registration). Every Line 9 claim requires completing Schedule C Part IV (Lines 43–47b) or Form 4562.**

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For most tradespeople, mobile contractors, real estate agents, and field consultants, **Line 9** is the single largest deduction on [Schedule C (Form 1040)](https://www.irs.gov/forms-pubs/about-schedule-c-form-1040)—and also the line the IRS computers flag first when Part IV (Information on Your Vehicle) is left blank or contradicts your mileage math. As you close your books for the **2026 tax year (filed in April 2027)** and set up your **2027 mileage log**, you need to know exactly what goes on Line 9, what gets split onto Line 16b or Line 20a, and how to answer all five mandatory questions in Part IV.

For the full picture of every expense box on your return, see [Schedule C line items explained](/keel/schedule-c-line-items-explained/) and our breakdown of the [2026 IRS mileage rate of 72.5 cents per mile](/keel/irs-mileage-rate-2026/).

## How do you calculate Schedule C Line 9 for 2026–2027?

Under [IRS Publication 463 (Travel, Gift, and Car Expenses)](https://www.irs.gov/publications/p463), you must choose between two mutually exclusive calculation methods for each business vehicle on **Schedule C Line 9**:

### Method 1: The Standard Mileage Rate (72.5¢/mile for 2026)
If you placed the vehicle in service for business using the standard mileage rate in its **first year**, you multiply your verified business miles by the annual IRS rate (**$0.725 per business mile in 2026**) and add **100% of business-trip parking fees and road/bridge tolls**:

- **Formula:** 2026 Business Miles multiplied by $0.725, plus 100% of Business Parking and Tolls.
- **Example:** A residential electrician drives **16,400 business miles** in 2026 (out of 20,000 total miles = 82% business use) and pays **$340** in jobsite city parking and turnpike tolls.
- **Line 9 entry:** 16,400 multiplied by $0.725 ($11,890) plus $340 equals **$12,230**.

### Method 2: The Actual Expense Method
Under the actual expense method, you total every operating cost of the truck or car for the calendar year—**fuel, oil changes, tires, brake jobs, auto insurance, vehicle registration/tag fees, wash/detailing, and garage rent**—and multiply that total by your **business-use percentage** (Business Miles divided by Total Miles Driven in the Year).

| Vehicle Cost Item | Included in Standard Mileage Rate (Line 9)? | Deductible Separately on Top of Standard Mileage? | Where It Goes Under Actual Expense Method |
|---|---|---|---|
| **Business miles × 72.5¢ (2026)** | **Yes** (core Line 9 calculation) | — | Not used |
| **Gasoline, diesel, EV charging, oil, tires, repairs, insurance** | Built into the 72.5¢ rate (do **not** double-deduct) | **No** | **Line 9** (multiplied by business-use %) |
| **Business trip parking meters, lots & road/bridge tolls** | **No** | **Yes — add to Line 9** | **Line 9** (100% of business trip tolls/parking) |
| **Auto loan interest (business % for sole proprietor)** | **No** | **Yes — deduct on Line 16b** | **Line 16b** (Other Interest, business %) |
| **Personal property / ad valorem excise tax on vehicle** | **No** | **Yes — deduct on Line 23** | **Line 23** (Taxes and licenses, business %) |
| **Vehicle depreciation (MACRS / Section 179 / Bonus)** | Built into the 72.5¢ rate (33¢/mi depreciation component) | **No** | **Line 13** via **Form 4562** (not Line 9!) |
| **Vehicle lease payments (business % less inclusion amount)** | **No** (cannot combine lease payments with standard mileage) | **No** | **Line 20a** (Rent/lease of vehicles & machinery) |

## Where do vehicle depreciation (Line 13) and lease payments (Line 20a) go?

**Critical trap to avoid:** Even when you use the **Actual Expense Method**, your vehicle's **depreciation (including Section 179 on a heavy >6,000 lb GVWR pickup or cargo van)** does **not** go on Line 9—it goes on **Schedule C Line 13** via **Form 4562**, and vehicle lease payments go on **Line 20a**. Putting depreciation or lease payments on Line 9 is one of the most common audit triggers on self-employed returns. Compare [standard mileage vs actual expenses](/keel/standard-mileage-vs-actual-expenses/) before locking in your first-year election.

## Can you deduct auto loan interest, parking, and tolls on top of standard mileage?

Yes. Self-employed sole proprietors who claim the **72.5¢ standard mileage rate** on Line 9 can still add **100% of business trip parking meters, garage fees, and highway/bridge tolls** directly into Line 9 (excluding daily commuter parking), and can separately deduct the **business-use percentage of auto loan interest on Schedule C Line 16b** plus the business-use percentage of state or county personal property vehicle taxes on **Line 23**.

## How do you fill out Schedule C Part IV (Lines 43–47b) without triggering an IRS notice?

Whenever you claim a deduction on **Line 9** and you are **not** required to file **Form 4562** (Depreciation and Amortization—which is required if you claim depreciation, Section 179, or actual expenses on a listed vehicle), you **must** complete **Part IV (Information on Your Vehicle)** on page 2 of Schedule C:

1. **Line 43 — When did you place your vehicle in service for business purposes?** Enter the exact `MM/DD/YYYY` date you first started driving that specific car, SUV, or pickup for your trade or business (not the date you bought it personally, if earlier).
2. **Line 44 — Total number of miles you drove your vehicle during the year for:**
   - **44a (Business):** Your logged non-commuting business miles (jobsite to jobsite, supply house runs, client bids, and travel from a qualified home office to work locations).
   - **44b (Commuting):** Nondeductible daily trips between your residence and a regular outside shop, office, or long-term fixed workplace (if you do not have a principal home office).
   - **44c (Other):** Personal errands, family trips, and weekend personal driving.
   - *Math check:* Line 44a multiplied by $0.725 (plus parking/tolls) must match your **Line 9** figure!
3. **Line 45 — Was your vehicle available for personal use during off-duty hours?** Check **Yes** unless it is a dedicated work truck parked in a locked commercial yard after hours or modified so it cannot be used personally (such as a van with permanent shelving and only a driver's seat).
4. **Line 46 — Do you (or your spouse) have another vehicle available for personal use?** Check **Yes** or **No** honestly. Claiming 100% business use on Line 44a while answering **No** on Line 46 is an immediate DIF-score audit flag unless you can prove how you handle personal travel.
5. **Line 47a & 47b — Do you have evidence to support your deduction, and is the evidence written?** Both **47a** and **47b** must be checked **Yes**. Under **IRC § 274(d)**, vehicle deductions are "listed property" requiring a **contemporaneous written or digital log** recording the date, mileage, destination/client, and business purpose of every trip. See [self-employed mileage deduction rules for 2026](/keel/self-employed-mileage-deduction-2026/).

## What changes between 2026 and 2027 if you switch between Standard Mileage and Actual Expenses?

The IRS enforces strict crossover rules when you carry a work vehicle from **2026 into 2027**:

- **First-year Standard Mileage preserves your flexibility:** If you use the **standard mileage rate** in the first year you place a car or truck in service for business, you can switch to **actual expenses** in 2027 or a later year (though any remaining depreciation must use straight-line over the remaining useful life).
- **First-year Actual Expenses locks you in forever:** If you claim **actual expenses**, MACRS depreciation, bonus depreciation, or a **Section 179 deduction** in the first year a vehicle is placed in service, you are **permanently barred** from ever using the standard mileage rate on that vehicle in 2026, 2027, or any future year.
- **Leased vehicles:** If you choose the standard mileage rate on a leased truck or car, you must use the standard mileage rate for the **entire lease period** (including renewals).

## Frequently asked questions

**What goes on Schedule C Line 9 vs Line 13 and Line 20a?**

Schedule C Line 9 reports either your standard mileage deduction (72.5¢ per business mile in 2026 plus business parking and tolls) or the business percentage of actual operating expenses (fuel, repairs, tires, insurance, and registration). Vehicle depreciation and Section 179 deductions go on Line 13 (via Form 4562), vehicle lease payments go on Line 20a, and the business percentage of auto loan interest goes on Line 16b.

**Do I fill out Schedule C Part IV or Form 4562 Part V for my work truck?**

If you claim only the standard mileage rate on Line 9 for a single vehicle and have no other depreciation to report on your return, you complete Schedule C Part IV (Lines 43–47b). If you are required to file Form 4562—because you claim vehicle depreciation, Section 179, actual expenses on listed property, or depreciation on other business equipment—you answer the vehicle questions in Part V of Form 4562 instead.

**Can I deduct parking, tolls, and car loan interest on top of the 72.5¢ mileage rate on Line 9?**

Yes, with two separate line placements. You add 100% of business-related parking fees and highway/bridge tolls directly into Schedule C Line 9 on top of your standard mileage calculation (commuting parking at a regular office is never deductible). You also deduct the business-use percentage of your vehicle loan interest on Schedule C Line 16b, and the business percentage of state/local ad valorem personal property tax on Line 23.

**Why does the IRS disallow Schedule C Line 9 deductions when Line 47b is checked "No"?**

Under Internal Revenue Code Section 274(d), passenger automobiles and light trucks are "listed property" that cannot be estimated under the Cohan rule. If you check "No" on Line 47a (do you have evidence?) or Line 47b (is the evidence written?), the IRS can automatically disallow your entire Line 9 deduction without further audit investigation.

**Can I claim two vehicles on Schedule C Line 9 without filing Form 4562?**

You can use the standard mileage rate on up to four business vehicles simultaneously (five or more constitutes a fleet, which must use actual expenses). Since Schedule C Part IV only has columns for one vehicle, the IRS Schedule C instructions direct you to attach an additional page with the Part IV lines (43–47b) completed for the second vehicle—or complete Part V of Form 4562.

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*This article is general tax information, not personalized tax advice. Consult IRS Publication 463 or a CPA for your filing.*

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