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Section 179 deduction

The Section 179 deduction is a tax benefit that allows businesses (and investor-owners) to immediately deduct the full cost of eligible property and equipment purchased in a tax year, rather than depreciating the cost over years. The Section 179 limit is $1.22 million for 2024 (adjusted annually for inflation). This provision accelerates tax deductions and improves cash flow for businesses investing in equipment, though it triggers full Section 1245 recapture on eventual sale.

For accelerated depreciation alternatives, see bonus depreciation. For recapture implications, see depreciation recapture for investors.

How Section 179 works

Without Section 179, a business buys equipment for $100,000 and depreciates it over 5-7 years, deducting $14,000-$20,000 annually.

With Section 179, the business can immediately deduct the entire $100,000 in the year of purchase, reducing taxable income by $100,000 in that year.

This front-loads the tax benefit: instead of spreading deductions over years, you get the full deduction at once. This is valuable for small businesses or startups with significant equipment purchases and positive income to offset.

The $1.22 million limit (2024)

Section 179 is capped at $1.22 million per year. If a business buys $1.5 million in equipment, it can deduct $1.22 million under Section 179 and must depreciate the remaining $280,000.

The limit is indexed annually for inflation. In years of significant capital expenditure, the limit may be a constraint.

The phase-out threshold

If total property placed in service exceeds $4.88 million (2024), the Section 179 deduction is reduced dollar-for-dollar. Buy $5.88 million in equipment, and the deduction is reduced by $1 million, leaving $220,000 available (instead of $1.22 million).

This phase-out is meant to limit the benefit to small and mid-sized businesses. Large corporations with multi-million-dollar annual capital budgets may phase out entirely.

Eligible vs. ineligible property

Eligible for Section 179:

  • Equipment and machinery
  • Vehicles (for business use, with limits)
  • Computers and technology
  • Furniture and fixtures
  • Qualified real property improvements (since 2018)

Not eligible:

The recapture cost

Section 179 deductions trigger full Section 1245 recapture on sale. If you deduct $100,000 under Section 179 and sell the equipment five years later for $50,000, the entire $50,000 gain is taxed at ordinary rates (up to 37% federally), not long-term capital gains rates.

This is a trade-off: immediate tax savings versus recapture tax on sale. For equipment with short useful lives (vehicles, computers), Section 179 is usually optimal. For longer-lived assets, the math is more complex.

Section 179 vs. bonus depreciation

Both Section 179 and bonus depreciation accelerate deductions, but they work differently:

  • Section 179: Immediate deduction up to $1.22 million; must elect it; limited by passive income
  • Bonus depreciation: 100% deduction for most property (through 2025, then phasing down); automatic; no election needed
  • Combined: You can use both, subject to the Section 179 limit

For most businesses, bonus depreciation is now more favorable because it is automatic and not capped.

Election and documentation

To claim Section 179, you must file Form 4797 (Sales of Business Property). You must elect Section 179 on your tax return; it is not automatic.

Documentation required: description of the property, date placed in service, cost, and Section 179 deduction claimed. Keep records for IRS substantiation.

Income limitations

Section 179 deductions cannot exceed your business income. If a business has $50,000 in income, it can deduct at most $50,000 under Section 179, even if it bought $500,000 in equipment. Excess deductions carry forward to the next year.

For investors, not just businesses

Self-employed investors and partnership members can claim Section 179 on their share of business property. Investors in real estate partnerships may have limited opportunities (real estate is generally not Section 179-eligible), but business equipment purchases are common.

See also

Wider context