Business Vehicle Deductions: Section 179, Bonus Depreciation, and the 6,000 lb Rule

By Yarik Yarosh, CPA ·September 5, 2026 ·6 min read

Written by Yarik Yarosh, CPA (US & Canada) September 5, 2026 · FL CPA license AC61704 · CPA Ontario

The business vehicle deduction is one of the most complex and most valuable deductions for small business owners. There are two methods (standard mileage rate or actual expenses), different rules for vehicles over and under 6,000 lbs GVWR, depreciation limitations under IRC 280F for passenger vehicles, and a separate SUV cap for Section 179 on vehicles between 6,000 and 14,000 lbs GVWR. Choosing the right method in Year 1 is a binding decision: if you claim depreciation (actual method) in Year 1, you can never switch to standard mileage for that vehicle. The 70 cents/mile standard rate for 2025 is historically high and often produces a larger deduction than the actual method for newer, fuel-efficient vehicles.

✓Key takeaway

Business vehicle deduction rules (2025):

Standard mileage rate:

70 cents per mile (2025)
Covers fuel, insurance, maintenance, depreciation, and repairs
Simple: just track miles
Available only if you use standard mileage in the FIRST year you use the vehicle for business
Cannot use standard mileage if: you claimed depreciation (MACRS or Section 179) on the vehicle, you have 5+ vehicles in service simultaneously, or the vehicle is used for hire (taxi, rideshare)

Actual expense method:

Deduct the business-use percentage of: fuel, insurance, maintenance, repairs, depreciation, lease payments, registration, car washes, parking, tolls
Must track all expenses AND mileage (to calculate business-use percentage)
More complex but can produce a larger deduction for expensive or high-cost vehicles

IRC 280F limitations (passenger vehicles under 6,000 lbs GVWR):

Year 1: $20,400 (with bonus depreciation) or $12,400 (without)
Year 2: $19,800
Year 3: $11,900
Year 4+: $7,160 per year until fully depreciated
A $50,000 car takes 6+ years to fully depreciate under these limits

Vehicles OVER 6,000 lbs GVWR (the “heavy vehicle” exception):

NO IRC 280F limits
Full Section 179 or bonus depreciation available
A $60,000 SUV can be fully deducted in Year 1
Common qualifying vehicles: most full-size SUVs (Tahoe, Suburban, Expedition, GX, X5), pickup trucks, vans
The SUV must be used more than 50% for business

Section 179 SUV cap (6,001-14,000 lbs GVWR):

Section 179 deduction limited to $30,500 (2025) for SUVs 6,001-14,000 lbs
BUT: bonus depreciation has NO SUV cap
Strategy: claim $30,500 Section 179 + remaining cost as bonus depreciation = full deduction
Or simply use bonus depreciation for the entire cost

Vehicles OVER 14,000 lbs GVWR:

No Section 179 cap at all
Full Section 179 AND bonus depreciation with no limits
Includes: all tow trucks, most box trucks, heavy-duty pickups (F-350+), dump trucks
These are fully deductible in Year 1 with no restrictions

Business-use percentage:

Only the business-use percentage is deductible
If a vehicle is 75% business, 25% personal: deduct 75% of actual expenses or 75% of miles at standard rate
Must log mileage to substantiate (IRS requires contemporaneous records)
Commuting is NEVER business use (unless you have a qualifying home office)

Standard mileage vs. actual expenses?

Hypothetical example

Round numbers. A consultant who buys a $45,000 SUV (5,500 lbs GVWR, under the 6,000 lb threshold). 80% business use. 20,000 business miles/year.

Option A: Standard mileage

20,000 miles x $0.70 = $14,000/year deduction
Over 5 years: $70,000 in deductions
Simple tracking: just log miles

Option B: Actual expenses

Expense	Annual	Business (80%)
Fuel ($250/month)	$3,000	$2,400
Insurance	$1,800	$1,440
Maintenance/repair	$1,200	$960
Car wash, registration	$600	$480
Depreciation (Year 1, with bonus)	$20,400	$16,320
Total Year 1		$21,600

Year 2-5 depreciation is limited:

Year	Depreciation Limit	Business (80%)	Other Expenses	Total
2	$19,800	$15,840	$5,280	$21,120
3	$11,900	$9,520	$5,280	$14,800
4	$7,160	$5,728	$5,280	$11,008
5	$7,160	$5,728	$5,280	$11,008

5-year totals:

Standard mileage: $70,000
Actual expenses: $21,600 + $21,120 + $14,800 + $11,008 + $11,008 = $79,536

Actual method wins by $9,536 over 5 years. But the actual method front-loads the deduction ($21,600 in Year 1 vs. $14,000), which has time-value-of-money benefits.

Now compare with a heavy vehicle (over 6,000 lbs):

Same scenario but a $65,000 SUV at 6,200 lbs GVWR (Tahoe, for example). 80% business use.

Option A: Standard mileage

20,000 miles x $0.70 = $14,000/year
Over 5 years: $70,000
Note: you CAN use standard mileage on a heavy vehicle if you didn’t claim depreciation

Option B: Actual expenses (heavy vehicle, no 280F limits)

Year	Depreciation	Business (80%)	Other Expenses	Total
1	$65,000 (full bonus)	$52,000	$5,280	$57,280
2	$0 (fully depreciated)	$0	$5,280	$5,280
3	$0	$0	$5,280	$5,280
4	$0	$0	$5,280	$5,280
5	$0	$0	$5,280	$5,280

5-year total: $78,400 Actual method advantage: $8,400

But look at the timing: $57,280 in Year 1 vs. $14,000 with standard mileage. The tax savings difference in Year 1 alone is ($57,280 - $14,000) x 33% = $14,282 in additional Year 1 tax savings.

When standard mileage wins:

Newer, fuel-efficient vehicles under 6,000 lbs with low operating costs
High-mileage drivers (30,000+ miles/year) where 70 cents/mile produces a large deduction
Owners who don’t want to track every expense
Leased vehicles (where the lease payment replaces depreciation, and the total actual deduction is lower)

When actual expenses win:

Heavy vehicles (over 6,000 lbs): the bonus depreciation in Year 1 is massive
Expensive vehicles where depreciation exceeds the mileage rate equivalent
Older, paid-off vehicles with high maintenance costs
Low-mileage, high-cost vehicles (the per-mile math favors actual when miles are low)

The critical Year 1 decision: If you claim actual expenses with depreciation in Year 1, you CANNOT switch to standard mileage for that vehicle, ever. But you CAN start with standard mileage and switch to actual later (though you’d use straight-line depreciation instead of MACRS). Starting with standard mileage preserves optionality.

For heavy vehicles (over 6,000 lbs), the answer is almost always actual expenses. The Year 1 bonus depreciation is too valuable to pass up. For lighter vehicles, standard mileage is often simpler and competitive.

Illustrative numbers only, not a real client and not advice for your facts.

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Cite this page

Yarik Yarosh, CPA. "Business Vehicle Deductions: Section 179, Bonus Depreciation, and the 6,000 lb Rule." Blue Cloud CPA, September 5, 2026. https://bluecloudcpa.com/guides/small-business-vehicle-deduction-section-179-bonus-depreciation

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.