Section 179 vs bonus depreciation for 2026: $2.56M limit, 100% bonus and deferred tax
For tax years beginning in 2026, a US business can expense up to $2,560,000 of qualifying equipment under Section 179, with that limit reduced dollar for dollar once Section 179 property placed in service during the year exceeds $4,090,000. Those are the inflation-adjusted figures the IRS published in Rev. Proc. 2025-32. Alongside Section 179, the 100% special depreciation allowance, usually called bonus depreciation, is available again for qualified property acquired and placed in service after January 19, 2025, following the changes made by P.L. 119-21, the law commonly known as the One Big Beautiful Bill Act.
Both provisions can turn the full cost of a machine, a server cluster or a fleet of vehicles into a first-year tax deduction. They reach that result through different rules: Section 179 is an asset-by-asset election capped by a dollar limit and by business taxable income, while bonus depreciation has no dollar cap, is claimed automatically unless the taxpayer elects out by class of property, and is figured after any Section 179 deduction. Neither election changes book depreciation under US GAAP, so every dollar of accelerated tax deduction creates a temporary difference and a deferred tax liability under ASC 740.
The choice therefore has two sides for a controller at year-end: the tax side, where limits, phase-outs and income caps decide how much can be deducted in 2026, and the financial reporting side, where the gap between tax basis and carrying amount has to be measured, booked and reversed over the asset's useful life.
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SECTION 179 LIMITS FOR 2026: DOLLAR CAP, PHASE-OUT AND INCOME LIMIT.
Section 179 lets a taxpayer elect to deduct the cost of qualifying property as an expense instead of recovering it through depreciation. Rev. Proc. 2025-32 sets three 2026 amounts. The aggregate cost a taxpayer can elect to expense cannot exceed $2,560,000. That limitation is reduced, but not below zero, by the amount by which the cost of Section 179 property placed in service during the 2026 taxable year exceeds $4,090,000. The cost of a sport utility vehicle that can be taken into account under Section 179 cannot exceed $32,000. For comparison, the 2025 figures in IRS Publication 946 were $2,500,000, $4,000,000 and $31,300.
The phase-out works mechanically. A company that places $4,500,000 of qualifying equipment in service in 2026 exceeds the threshold by $410,000, so its Section 179 limit falls from $2,560,000 to $2,150,000. At $6,650,000 of qualifying purchases the limit reaches zero. Section 179 is therefore a tool designed for small and mid-sized buyers of equipment; large capital spenders rely on bonus depreciation.
The second constraint is the business income limit. The Form 4562 instructions state that the total cost a taxpayer can deduct under Section 179 is limited to taxable income from the active conduct of a trade or business. A deduction disallowed by this limit carries over to later years and is reported on line 13 of Form 4562. For married taxpayers filing separately, the dollar limit is split, generally 50% each unless they elect a different allocation totaling 100%.
The third constraint applies after the asset is in use. If Section 179 property is not used predominantly, meaning more than 50%, in the trade or business before the end of its recovery period, the benefit of the Section 179 deduction is recaptured and reported as other income.
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Section 179 parameter | 2025 | 2026 |
Maximum deduction | $2,500,000 | $2,560,000 |
Phase-out threshold | $4,000,000 | $4,090,000 |
Limit reaches zero at | $6,500,000 | $6,650,000 |
SUV cost cap | $31,300 | $32,000 |
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BONUS DEPRECIATION IN 2026: 100% ALLOWANCE AND ELECTIONS.
P.L. 119-21 reinstated the 100% special depreciation allowance for qualified property acquired and placed in service after January 19, 2025. Treasury and the IRS issued Notice 2026-11 on January 14, 2026 with interim guidance, describing the 100% deduction as permanent for property acquired after that date and allowing taxpayers to generally rely on the existing regulations while new rules are developed. Property acquired before January 20, 2025 stays on the phased-down percentages of the earlier law, so acquisition date records, binding contract dates and placed-in-service dates have to be documented asset by asset.
The allowance is an additional deduction taken after any Section 179 expense deduction. Section 179 reduces the depreciable basis first, the special allowance is computed on the reduced basis, and regular MACRS depreciation applies to whatever basis remains. When the special allowance is 100%, nothing remains for MACRS.
Three elections shape the outcome. A taxpayer can elect out of the special allowance, but the election applies to all property in a class placed in service during the year, it is made by a statement attached to a timely filed return, and it cannot be revoked without IRS consent. For qualified property placed in service during the first tax year ending after January 19, 2025, a taxpayer can elect a 40% allowance (60% for long production period property and certain aircraft) instead of 100%. Notice 2026-11 also covers elections for specified plants, for certain larger self-constructed property and for qualified sound recording productions.
There is no dollar cap and no phase-out on the special allowance, and the business income limit in the Form 4562 instructions is a Section 179 rule. A bonus deduction that exceeds income produces a tax loss, which is then governed by the net operating loss rules instead of a Section 179 carryover.
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SECTION 179 VS BONUS DEPRECIATION: SIDE-BY-SIDE COMPARISON.
The two regimes often give the same first-year deduction for a profitable company buying a modest amount of equipment. The differences show up at the edges: very large purchase volumes, loss years, assets with mixed personal and business use, and businesses that want to accelerate some assets in a class but not others.
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Feature | Section 179 | Bonus depreciation |
2026 rate or cap | Up to $2,560,000 | 100% of basis |
Phase-out | Above $4,090,000 placed in service | None |
Income limit | Business taxable income | None |
Excess deduction | Carried forward | Tax loss (NOL rules) |
How claimed | Election, asset by asset | Automatic unless elected out |
Election out | Not applicable | By class of property |
Order | First | After Section 179 |
Business use 50% or less | Recapture as income | Listed-property rules |
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The asset-by-asset nature of Section 179 is the main planning advantage. A company that wants full expensing on its production equipment but ordinary MACRS on its office furniture in the same class can elect Section 179 on the equipment, elect out of bonus for the class, and depreciate the furniture normally. Bonus depreciation does not allow that selectivity inside a class.
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HOW BOOK DEPRECIATION AND TAX DEPRECIATION DIFFER UNDER ASC 360 AND ASC 740.
Section 179 and bonus depreciation are tax provisions only. In the financial statements, the asset is still carried at cost and depreciated over its useful life to its residual value under ASC 360, using a method that reflects the pattern of consumption. A machine expensed in full for tax in 2026 may have a five-year useful life for book purposes, so the tax basis is zero while the carrying amount is still most of the cost.
That gap is a taxable temporary difference. ASC 740 requires a deferred tax liability measured at the enacted tax rate expected to apply when the difference reverses. The liability reverses as book depreciation catches up with the tax deduction already taken. The total tax expense recognized over the asset's life does not change; the cash tax saving is front-loaded and the income statement shows a normal effective rate because the deferred tax expense offsets the lower current tax. The related questions of measurement and presentation are covered in how deferred tax assets and liabilities are recognized under IAS 12 and ASC 740.
The deferred tax liability also matters for the other side of the balance sheet. A large liability created by bonus depreciation is a source of future taxable income that can support the recognition of deferred tax assets elsewhere in the same jurisdiction, which is one of the positive evidence factors in the valuation allowance assessment under ASC 740 and IAS 12, provided the reversal pattern lines up with the deductible differences.
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WORKED EXAMPLE: 100% BONUS DEPRECIATION AND THE DEFERRED TAX LIABILITY.
The figures below are illustrative. A calendar-year C corporation buys production equipment for $600,000 and places it in service at the start of 2026. The equipment was acquired after January 19, 2025 and qualifies for the 100% special allowance. For book purposes the company depreciates it straight-line over five years with no residual value, giving $120,000 a year. Income before depreciation on this asset is $2,000,000. The example uses the 21% federal corporate rate and ignores state taxes.
For tax, the company deducts the full $600,000 in 2026. Because its taxable income is far above the asset cost and its total purchases are well below $4,090,000, electing Section 179 instead would give the same $600,000 deduction; the accounting below is identical under either route.
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2026 measure | Book | Tax |
Income before depreciation | $2,000,000 | $2,000,000 |
Depreciation or deduction | $120,000 | $600,000 |
Pretax or taxable income | $1,880,000 | $1,400,000 |
Tax at 21% | $394,800 | $294,000 |
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Current tax payable is $294,000. At year-end the carrying amount of the equipment is $480,000 and its tax basis is zero, so the taxable temporary difference is $480,000 and the deferred tax liability is $100,800. Total income tax expense is $294,000 current plus $100,800 deferred, or $394,800, which equals 21% of book pretax income of $1,880,000.
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Entry (2026) | Account | Debit | Credit |
Purchase | Property, plant and equipment | $600,000 | |
Purchase | Cash | $600,000 | |
Depreciation | Depreciation expense | $120,000 | |
Depreciation | Accumulated depreciation | $120,000 | |
Current tax | Current income tax expense | $294,000 | |
Current tax | Income taxes payable | $294,000 | |
Deferred tax | Deferred income tax expense | $100,800 | |
Deferred tax | Deferred tax liability | $100,800 |
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From 2027 onward the company records $120,000 of book depreciation each year with no tax deduction left, so taxable income exceeds book income by $120,000 and the deferred tax liability unwinds by $25,200 a year. The entry each year is a debit to the deferred tax liability and a credit to deferred income tax expense of $25,200.
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Year-end | Carrying amount | Tax basis | Deferred tax liability | Change |
2026 | $480,000 | $0 | $100,800 | +$100,800 |
2027 | $360,000 | $0 | $75,600 | -$25,200 |
2028 | $240,000 | $0 | $50,400 | -$25,200 |
2029 | $120,000 | $0 | $25,200 | -$25,200 |
2030 | $0 | $0 | $0 | -$25,200 |
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A second illustrative case shows where the two regimes split. A smaller company buys the same $600,000 machine but has only $250,000 of business taxable income before this deduction. Under Section 179 the deduction is capped at $250,000 by the business income limit, and the remaining $350,000 of elected cost carries forward to later years. Under 100% bonus depreciation the full $600,000 is deducted, producing a $350,000 tax loss that falls under the net operating loss rules. For financial reporting, the carryforward or loss is a deferred tax asset that sits next to the deferred tax liability on the equipment and has to be assessed for realizability.
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IFRS VS US GAAP: DEFERRED TAX ON ACCELERATED TAX DEPRECIATION.
US subsidiaries of groups reporting under IFRS face the same tax deductions with a slightly different accounting frame. IAS 12 also recognizes a deferred tax liability for the taxable temporary difference, and the mechanics of the example above are the same. The differences are in measurement detail and in the book depreciation that drives the reversal.
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Issue | US GAAP | IFRS |
Deferred tax standard | ASC 740 | IAS 12 |
Tax rate used | Enacted rate | Enacted or substantively enacted |
Balance sheet classification | Noncurrent | Not classified as current |
Book depreciation | ASC 360, single useful life common | IAS 16, significant components |
Discounting of deferred tax | Not permitted | Not permitted |
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Under IAS 16 each significant component of an asset is depreciated separately, so a single tax deduction can map to several book components with different lives and reversal patterns. The mechanics are covered in how component depreciation works under IAS 16 and ASC 360, and the reversal schedule of the deferred tax liability has to follow that component structure.
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COMMON ERRORS WITH SECTION 179, BONUS DEPRECIATION AND DEFERRED TAX.
The most frequent error is treating the tax deduction as if it changed the book asset. Fixed asset registers that carry a single depreciation book often end up with the tax schedule driving the financial statements, which expenses the asset in the income statement and understates property, plant and equipment. A separate book and tax ledger, reconciled every period, prevents it. The difference between expensing and capitalizing is discussed in depreciation vs amortization: differences, methods and accounting entries.
The second error concerns dates. Bonus eligibility at 100% depends on acquisition after January 19, 2025 and on the placed-in-service date, and Section 179 limits depend on the cost of property placed in service in the taxable year. Equipment delivered in December but not ready and available for its specific use until January belongs to the next year for both regimes.
The third error is forgetting the Section 179 income limit and the carryforward in the tax provision. A Section 179 carryover is a deferred tax asset in its own right, and an unrecorded carryover misstates both the provision and the deferred tax note. A related error is assuming that state tax law follows the federal rules; state conformity to Section 179 and bonus depreciation has to be checked separately for each state return and each state deferred tax computation.
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SECTION 179 AND BONUS DEPRECIATION FOR 2026: YEAR-END CHECKLIST.
For 2026 returns, the federal figures are settled: a $2,560,000 Section 179 limit, a $4,090,000 phase-out threshold, a $32,000 SUV cap and a 100% special allowance for qualified property acquired after January 19, 2025. The choice between the two regimes depends on facts that differ by company: total purchases in the year, business taxable income, whether some assets in a class should stay on MACRS, expected business use of vehicles and mixed-use assets, and state conformity.
Before closing the year, finance teams should confirm acquisition and placed-in-service dates for every addition; total Section 179 property placed in service against the $4,090,000 threshold; compare business taxable income with the intended Section 179 amount; decide any election out of bonus by class and prepare the statement for the return; record the deferred tax liability at the enacted rate and schedule its reversal from the book depreciation lives; and recognize any Section 179 carryover or tax loss as a deferred tax asset subject to a realizability review. The financial statement result is the same total tax expense over the asset's life; what changes is the timing of the cash and the size of the deferred tax balances.
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