The Depreciation Component of the Standard Mileage Rate (2026): How Every Mile Lowers Your Car's Basis

Published: June 23, 2026 · Reading time: 7 min

TL;DR: The IRS standard mileage rate isn't just gas money — it bundles in a depreciation component, a built-in cents-per-mile amount the IRS treats as wear-and-tear (it was 33¢/mile for 2025; the 2026 figure comes from the IRS's annual mileage notice). Every business mile you claim quietly reduces your car's tax basis by that amount, even though you never separately deducted depreciation. The bill can come due when you sell or trade the car: a lower basis means a bigger taxable gain, partly taxed as depreciation recapture. Your basis can't go below zero, and you keep deducting at the full rate after that. Track your business miles and the depreciation component each year so a clean mileage deduction doesn't become a tax surprise later.

The standard mileage rate feels like the simple option — multiply business miles by the IRS rate and you're done. And for the deduction itself, it is simple. But hidden inside that single rate is a quiet mechanism most freelancers never think about until they sell the car: a depreciation component that's steadily shrinking the vehicle's tax basis. Understanding it now prevents an unwelcome surprise later.

What's actually inside the standard mileage rate

The standard mileage rate is the IRS's all-in proxy for the cost of operating a vehicle for business. Rolled into that one cents-per-mile number are:

• Gas and oil
• Maintenance and repairs
• Insurance and registration
• Depreciation — the wear-and-tear on the vehicle itself

That last piece is the depreciation component. It's the reason you can't also deduct actual depreciation when you use the standard rate (why you can't double-dip) — depreciation is already in there.

The per-mile figure changes every year

Each year the IRS publishes a specific depreciation-per-mile amount as part of its annual mileage notice. Recent reference points:

This figure is separate from the headline standard mileage rate. Use each year's depreciation component for the miles you drove in that year — they don't all use the same number.

How it eats into your basis

Here's the mechanic that catches people. When you take the standard mileage deduction, the IRS treats you as having claimed depreciation equal to:

Business miles × that year's depreciation component = deemed depreciation

That deemed depreciation reduces your vehicle's adjusted basis — your remaining tax investment in the car — even though you never filled out a depreciation form.

Example. You buy a car for $30,000 and drive it heavily for business:

After three heavy years, you've quietly knocked ~$11,500+ off the car's basis — from $30,000 down to roughly $18,500 — without ever "taking depreciation" in the way you'd think.

The day it matters: selling or trading the car

Basis is what you subtract from the sale price to figure gain or loss. Because the standard mileage rate kept lowering your basis, the math at sale time changes:

• Sell for more than your reduced basis → taxable gain. Part of that gain is depreciation recapture, taxed as ordinary income up to the depreciation deemed taken. See depreciation recapture for freelancers.
• Sell for less than your adjusted basis → potential loss (for the business-use portion).

The trap is assuming "I only used standard mileage, so there's nothing to report." The depreciation component means there may well be — a car sold for $18,000 with a reduced basis of $14,000 can produce a $4,000 taxable gain you'd never expect from a "simple" mileage deduction.

Two rules that protect you

1. Basis can't go below zero. The deemed depreciation reduces your basis but stops at zero. Once you've reduced basis to nothing, you keep deducting the full standard mileage rate on future business miles — you just have no more basis to reduce.

2. You still deduct at the full rate the whole time. The depreciation component isn't a deduction you lose; it's an accounting tail. You get the full mileage deduction every year; you simply have to account for the basis reduction when you dispose of the vehicle.

What to actually track

You don't deduct the depreciation component separately — but you do need the records to compute basis later. Keep:

• Original purchase price and date (your starting basis)
• Business miles for every year you used the standard rate (contemporaneous mileage log)
• The depreciation component for each of those years
• Sale or trade-in details when you dispose of the car

When you sell, multiply business miles by each year's component, total it, subtract from your original basis, and use the result to figure gain or loss. A good mileage log makes this painless; a missing one makes it a guess.

Frequently Asked Questions

What is the depreciation component of the standard mileage rate?

It's the slice of the IRS standard rate that represents vehicle wear-and-tear. The IRS sets a cents-per-mile figure each year (33¢ for 2025; 2026 is in the annual notice), and each business mile reduces your car's basis by that amount.

How does the standard mileage rate affect my car's tax basis?

You're deemed to take depreciation equal to business miles times the depreciation component, which lowers your vehicle's adjusted basis year after year.

Do I owe tax when I sell a car I deducted with standard mileage?

Possibly. The reduced basis can create a taxable gain on sale or trade, part of it taxed as depreciation recapture (ordinary income) up to the depreciation deemed taken.

Can the depreciation component reduce my basis below zero?

No — basis stops at zero. After that you keep deducting the full standard mileage rate, but there's no further basis to reduce.

Do I have to track the depreciation component myself?

You don't deduct it separately, but track your business miles, each year's depreciation component, and your purchase price so you can compute adjusted basis when you sell.

Authoritative References

• IRS — Standard Mileage Rates
• IRS Publication 463 — Travel, Gift, and Car Expenses
• IRS Topic No. 510 — Business Use of Car
• IRS Publication 946 — How to Depreciate Property
• IRS Schedule C (Form 1040) instructions

Track Every Mile — and Every Year

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