Section 179 Tax Deduction Calculator
Calculate your Section 179 tax deduction, vehicle limits, TCJA bonus depreciation, and first-year cash savings for 2024 and 2025 equipment purchases.
Section 179 Tax Deduction & Equipment Expensing Calculator
Simulate IRS Section 179 write-offs, vehicle limits, bonus depreciation, and first-year cash savings.
Must exceed 50% for Section 179 eligibility.
Combined Federal + State tax rate.
Immediate reduction in income taxes owed for tax year 2025.
How Section 179 Equipment Expensing Works
Section 179 is one of the most powerful tax incentives in the United States tax code designed to encourage businesses to invest in capital assets. Rather than depreciating an asset incrementally over its IRS MACRS recovery period (such as 5 or 7 years), Section 179 allows you to write off up to 100% of qualifying tangible personal property in the very first year it is placed in service.
Step-by-Step Calculation Formula
- Qualifying Basis: Multiply purchase price by business use percentage (must exceed 50%).
- Phase-Out Reduction: Reduce the maximum deduction dollar-for-dollar for total annual equipment purchases exceeding the statutory threshold ($3,130,000 in 2025).
- Section 179 Expensing: Deduct up to the allowable cap ($1,250,000 or $30,500 for heavy passenger SUVs).
- Bonus Depreciation: Apply bonus depreciation percentage (40% in 2025, 60% in 2024) to any remaining basis.
- First-Year MACRS: Depreciate remaining balance under standard MACRS recovery schedules.
- Cash Savings: Total Deduction × Marginal Tax Bracket = Net cash tax savings.
Key Features
Statutory 2024 & 2025 Limits
Models the $1,220,000 (2024) and $1,250,000 (2025) IRS maximum expensing caps with exact phase-out thresholds.
Heavy SUV & Commercial Vehicle Rules
Differentiates passenger SUVs (6,000-14,000 lbs GVWR cap of $30,500) from full write-off cargo vans and work trucks.
TCJA Bonus Depreciation Phase-Out
Seamlessly blends remaining basis into 60% (2024) and 40% (2025) first-year bonus depreciation.
Net Out-of-Pocket Cost Analysis
Calculates the true discounted cost of new equipment purchases after accounting for income tax refunds.
Business Use Ratio Validation
Enforces IRS strict 50% minimum business use hurdle to prevent invalid deduction claims.
1-Click Scenario Comparison
Instant presets for work trucks, heavy luxury SUVs, software, and industrial manufacturing machinery.
Common Use Cases
- ✓Small Business Owners & LLCs
Plan capital expenditures and fleet expansions before year-end to slash federal and state tax liabilities.
- ✓Contractors & Tradespeople
Purchase heavy-duty pickup trucks, trailers, and excavation gear while writing off up to 100% of purchase price in Year 1.
- ✓Medical & Dental Practices
Finance high-value imaging equipment, chairs, and clinical software systems with immediate write-offs.
- ✓Tech & Creative Agencies
Deduct high-performance servers, workstations, cameras, and off-the-shelf software packages.
Frequently Asked Questions
What is Section 179 of the Internal Revenue Code?
Section 179 allows US businesses to deduct the full purchase price of qualifying equipment, vehicles, and software purchased or financed during the tax year, rather than capitalizing and depreciating the asset over multiple years.
What is the Section 179 limit for 2025?
For tax year 2025, the Section 179 deduction limit is $1,250,000 with an equipment purchase phase-out threshold of $3,130,000. For 2024, the limit was $1,220,000 with a $3,050,000 phase-out threshold.
What is the Heavy SUV rule for Section 179?
Vehicles with a Gross Vehicle Weight Rating (GVWR) between 6,000 and 14,000 pounds are subject to a specific Section 179 cap ($30,500 in 2025). However, any remaining cost basis can be written off using Bonus Depreciation (40% in 2025) plus first-year MACRS depreciation.
Can I take Section 179 on leased or financed equipment?
Yes! You can claim the full Section 179 write-off in the year equipment is placed in service, even if you put zero money down and financed 100% through an equipment lease or loan.
What happens if business use is under 50%?
If business use of the asset drops below 50%, the property is completely disqualified from Section 179 and Bonus Depreciation, and must be depreciated using standard MACRS straight-line methods.
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