The Heavy SUV Deduction After Year One: What Section 179 Is Worth, and What Comes Back

The rule in brief

A vehicle used for business is depreciable property, and how fast it can be written off depends mostly on its weight. Passenger automobiles rated at 6,000 pounds gross vehicle weight (GVWR) or less are subject to annual depreciation caps. Sport utility vehicles rated above 6,000 and up to 14,000 pounds are not, but they have their own Section 179 limit. According to IRS Publication 946, the maximum Section 179 expense deduction for such SUVs placed in service in tax years beginning in 2026 is $32,000. Publication 946 also explains that P.L. 119-21, the 2025 tax law, reinstated a 100 percent special depreciation allowance, usually called bonus depreciation, for qualified property acquired and placed in service after January 19, 2025.

Put together, a heavy SUV bought in 2026 for $185,000 and used 85 percent for business has a business basis of $157,250. Section 179 covers $32,000 of it and bonus depreciation covers the remaining $125,250, so the whole business basis can be deducted in the first year. That is the widely repeated "G-Wagon" figure, and it is arithmetically correct. The Section 179 vehicle calculator computes it for other prices, weight classes and elections. This article is about what that figure leaves out: what the deduction is worth in tax, and how much of it comes back later.

What a $157,250 deduction is worth

The usual shortcut multiplies the deduction by the top federal rate: $157,250 × 37 percent is $58,183. That is only right if every dollar of the deduction comes off income taxed at 37 percent. A deduction this large usually reaches down through several brackets. The table below computes the actual 2026 federal income tax reduction, which is the tax on taxable income before the deduction minus the tax after it, using the brackets in IRS release IR-2025-103.

Filing status	Taxable income before the deduction	Federal tax reduction	Effective rate on the deduction
Married filing jointly	$250,000	$34,562	22.0%
Married filing jointly	$400,000	$37,740	24.0%
Married filing jointly	$600,000	$52,946	33.7%
Married filing jointly	$900,000	$57,664	36.7%
Single	$200,000	$35,716	22.7%
Single	$350,000	$52,411	33.3%
Single	$700,000	$56,226	35.8%

Federal income tax only, 2026 rate schedules, a $157,250 deduction. Excludes state tax, self-employment tax, the qualified business income deduction and the Net Investment Income Tax, each of which can move the figure.

A married couple with $400,000 of taxable income saves about $37,740, not $58,183, because most of the deduction comes off income taxed at 24 percent and 22 percent. The shortcut is close only for incomes well above the start of the 37 percent bracket, $768,700 for joint filers in 2026. Section 179 has one more limit that bonus depreciation does not: under Publication 946 it cannot exceed taxable income from the active conduct of a trade or business, with any excess carried forward. In a low-income year that part of the deduction may not help at all until later.

States add their own layer. California's FTB Publication 1001 says the state does not follow federal bonus depreciation and limits Section 179 expensing to $25,000, so a California filer deducts much less in the first year on the state return and more in later years.

When business use drops: excess depreciation

The first-year deduction depends on business use above 50 percent, and Publication 946 keeps testing that for the whole recovery period. Vehicles are listed property. If business use falls to 50 percent or less in any later year, the owner must include "excess depreciation" in income that year. Excess depreciation is the depreciation actually claimed for earlier years, including Section 179 and the special allowance, minus what would have been allowed for those years under the straight-line method over the alternative depreciation system (ADS) recovery period.

For a truck, Publication 946's own example uses ADS straight-line rates of 10, 20, 20, 20, 20 and 10 percent over six tax years. Applied to the $157,250 business basis above, with the vehicle placed in service in 2026 and business use at 85 percent until the year it falls, the amount that comes back into income is:

Year business use falls to 50% or less	Depreciation allowable under ADS for earlier years	Excess depreciation included in income
2027	$15,725	$141,525
2028	$47,175	$110,075
2029	$78,625	$78,625
2030	$110,075	$47,175
2031	$141,525	$15,725
2032 or later	$157,250	$0

The recapture is ordinary income, reported through Form 4797, Part IV, on the same schedule where the depreciation was taken, and the vehicle's basis goes up by the same amount. A change of job, a new business model, or a second family car that takes over the business trips can each trigger it. The exposure falls each year and disappears once the recovery period is over.

When the vehicle is sold: section 1245 recapture

Even if business use stays above 50 percent, a vehicle that has been written off in full has a business basis of zero, so selling it produces a gain. IRS Publication 544 treats a vehicle as section 1245 property: gain on its sale is ordinary income to the extent of the depreciation allowed, including the Section 179 deduction. For a vehicle used partly for personal purposes, Publication 544 requires the sale price and basis to be split between the business part and the personal part, and it says a loss on property held for personal use is not deductible.

Suppose the same SUV is sold in 2029 for $100,000 with business use still at 85 percent. The business part of the price is $85,000 against a basis of zero, so the whole $85,000 is ordinary income. The personal part is $15,000 against a basis of $27,750, a loss of $12,750 that cannot be deducted. Over the whole period the owner deducted $157,250 and later reported $85,000, a net deduction of $72,250, which is what the business share of the vehicle actually lost in value. At a 24 percent rate in the year of sale the recapture costs $20,400; at 37 percent it costs $31,450.

That is the real shape of the deduction. It moves tax from the purchase year to the sale year rather than removing it. It pays off most for someone taxed at a high rate in the purchase year and a lower rate in the sale year, and least for someone in the opposite position. Trading the vehicle in rather than selling it does not avoid this, because Publication 544 limits like-kind exchange treatment to real property.

Records the deduction depends on

None of this survives an examination without records. IRS Publication 463 asks for the cost of the car and any improvements, the date it was first used for business, the mileage for each business use, and the total miles for the year, together with the time, place and business purpose of each trip. Records should be made at or near the time of use. A log kept weekly counts as timely, and a record kept for a representative part of the year, such as the first week of each month, can support the business-use percentage for the whole year if other evidence shows those weeks are typical. Publication 946 adds that no depreciation or Section 179 deduction is allowed for listed property without adequate records, and that the records must be kept for as long as recapture can occur.

The standard mileage rate is closed off

The alternative to depreciation is the standard mileage rate, which covers operating costs and depreciation in one figure. The IRS rate for business use is 72.5 cents a mile from January 1 to June 30, 2026, and 76 cents a mile from July 1 to December 31, 2026, so 12,000 business miles split evenly across the two halves of the year come to $8,910. Publication 463 says the standard mileage rate cannot be used for a car on which a Section 179 deduction or the special depreciation allowance has been claimed. The choice made in the first year therefore applies for as long as the vehicle is owned. After a full first-year write-off, the later years allow only the business share of actual operating costs such as fuel, insurance and repairs.

Frequently asked questions

Can a heavy SUV bought in 2026 be deducted in full in the first year?

The business-use share of its cost can be, if business use is more than 50 percent. Section 179 is limited to $32,000 for SUVs rated above 6,000 and up to 14,000 pounds, but the 100 percent special depreciation allowance for property acquired and placed in service after January 19, 2025 covers the rest. A $185,000 SUV used 85 percent for business gives a first-year deduction of $157,250.

How much tax does a $157,250 vehicle deduction save?

It depends on how many brackets the deduction reaches down through. Using 2026 federal rates, a married couple with $400,000 of taxable income saves about $37,740 of federal income tax, while a couple with $900,000 saves about $57,664. Multiplying the deduction by 37 percent gives $58,183, which is only close for incomes well inside the top bracket.

What happens if business use falls below 50% later?

Publication 946 requires excess depreciation to be included in income in the first year business use is 50 percent or less. Excess depreciation is what was claimed for earlier years minus what straight-line depreciation over the ADS recovery period would have allowed. For the $157,250 example, a drop in 2028 brings $110,075 back into income; a drop in 2031 brings back $15,725.

Is the deduction taxed again when the vehicle is sold?

The gain is. A fully written-off vehicle has a business basis of zero, and Publication 544 treats gain on the sale of depreciated vehicles as ordinary income up to the depreciation taken. Selling the example SUV for $100,000 in 2029 produces $85,000 of ordinary income on the business part.

Can I use the standard mileage rate instead after claiming Section 179?

No. Publication 463 says the standard mileage rate cannot be used for a car on which Section 179 or the special depreciation allowance was claimed. For 2026 the business rate is 72.5 cents a mile for January to June and 76 cents from July.

Sources

• IRS Publication 946, How To Depreciate Property (2026 Section 179 limits, special allowance, listed property, excess depreciation)
• IRS Publication 544, Sales and Other Dispositions of Assets (section 1245 recapture, property used partly for business)
• IRS Publication 463, Travel, Gift, and Car Expenses (records, standard mileage rate restrictions)
• IRS, Standard mileage rates (2026)
• IRS, IR-2025-103, tax year 2026 inflation adjustments
• California FTB Publication 1001 (2025)