Section 179 Deduction Calculator

Enter your equipment cost, business income, and depreciation rates to calculate your Section 179 deduction, bonus depreciation, estimated tax savings, and remaining depreciable basis.

Created by Luis GonzalezLast updated: May 9, 2026

How to Use This Calculator

1
Enter Cost of Equipment
Input the total purchase price of the qualifying equipment or software in dollars. This is the asset you wish to deduct.
2
Specify Section 179 Limit
Enter the maximum Section 179 deduction allowed for the current tax year (e.g., $1,160,000 for 2023). This limit is subject to annual adjustments.
3
Input Business Income
Provide your total taxable business income for the year. The Section 179 deduction cannot exceed this amount.
4
Enter Bonus Depreciation Rate
Input the bonus depreciation percentage for the current tax year (e.g., 80 for 80% in 2023). This rate is phasing out.
5
Review Your Results
The calculator will display your total deduction, Section 179 amount, bonus depreciation, and estimated tax savings.

Example Calculation

A small business purchases $50,000 worth of new equipment. They have $60,000 in taxable business income. For the current tax year (e.g., 2023), the Section 179 limit is $1,160,000 and bonus depreciation is 80%.

Cost of Equipment ($)

50,000

Section 179 Limit ($)

1,160,000

Business Income ($)

60,000

Bonus Depreciation Rate (%)

Results

$50,000.00

Tips

Check Annual Limits

The Section 179 deduction limit and bonus depreciation rates change annually. Always verify the current IRS limits for the specific tax year you are planning to ensure accurate calculations and avoid penalties.

Business Income Limitation

Remember that your Section 179 deduction cannot exceed your taxable business income. If your deduction is limited by income, the unused portion can typically be carried forward to future tax years.

Qualifying Property

Ensure your equipment qualifies for Section 179. Eligible property generally includes tangible personal property like machinery, computers, and off-the-shelf software, purchased for business use. Real property improvements may also qualify under specific conditions.

The Section 179 Deduction Calculator provides businesses with a swift and accurate estimate of their immediate tax savings from qualifying equipment purchases. By analyzing the cost of equipment, current Section 179 limits, business income, and bonus depreciation rates, the tool helps owners understand their total potential deduction. This is crucial for strategic financial planning in 2025, especially as Section 179 limits are adjusted annually for inflation (expected around $1.22 million for 2025) and bonus depreciation continues to phase down (40% for 2025).

Strategic Asset Acquisition and Depreciation for Businesses

Section 179 and bonus depreciation are powerful tax incentives designed to encourage business investment by allowing immediate expensing of qualifying assets rather than depreciating them over several years. This accelerated write-off significantly reduces a business's taxable income in the year of purchase, thereby improving cash flow and providing substantial tax relief. For instance, a small business investing $100,000 in new machinery could deduct the entire amount upfront, rather than taking smaller deductions over a 5- or 7-year period. This immediate benefit is particularly impactful for small and medium-sized businesses, enabling them to reinvest savings, upgrade technology, and enhance operational efficiency, all while adhering to IRS guidelines for eligible property.

Calculating Your Equipment Tax Deduction

The calculation for the Section 179 deduction and bonus depreciation involves several steps to determine the maximum allowable deduction for qualifying equipment.

Here's the logic:

Calculate Section 179 Deduction: This is the smallest of the equipment cost, the annual Section 179 limit, or your taxable business income.
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Section 179 Deduction = MIN(Cost of Equipment, Section 179 Limit, Business Income)
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Calculate Remaining Cost after Section 179:

Remaining Cost = Cost of Equipment - Section 179 Deduction

Calculate Bonus Depreciation: This is a percentage of the remaining cost.

Bonus Depreciation = Remaining Cost × (Bonus Depreciation Rate / 100)

Calculate Total Deduction:

Total Deduction = Section 179 Deduction + Bonus Depreciation

This method ensures compliance with IRS rules for immediate expensing.

💡 To explore other business tax advantages, our Section 125 Cafeteria Plan Calculator can help you estimate savings from pre-tax employee benefits.

Worked Example: Maximizing Equipment Purchase Deductions

A small business buys $50,000 worth of new computer equipment. For the current tax year, the Section 179 limit is $1,160,000, and the business has $60,000 in taxable income. Bonus depreciation is available at 80%.

Calculate Section 179 Deduction:
- MIN($50,000, $1,160,000, $60,000) = $50,000
- The full cost of the equipment can be deducted under Section 179.
Calculate Remaining Cost:
- $50,000 (Cost) - $50,000 (Section 179) = $0
- Since the full cost was expensed under Section 179, there is no remaining basis for bonus depreciation.
Calculate Bonus Depreciation:
- $0 × (80 / 100) = $0
Calculate Total Deduction:
- $50,000 (Section 179) + $0 (Bonus Depreciation) = $50,000

The total deduction for the business is $50,000, meaning the entire cost of the equipment can be written off in the year of purchase.

💡 For an overview of self-employment tax obligations, our Self-Employment Income Tax Calculator can help estimate your total tax burden.

Strategic Asset Acquisition and Depreciation for Businesses

Strategic asset acquisition and depreciation are critical for businesses aiming to optimize their tax position and cash flow. Section 179 and bonus depreciation incentives, governed by IRS regulations, allow for immediate expensing of qualifying assets like machinery, software, and certain vehicles used for business. For 2025, the Section 179 deduction limit is anticipated to be around $1.22 million, with a phase-out threshold of approximately $3.05 million for total equipment purchased. Bonus depreciation, which was 100% in 2022, is phasing down, set at 60% for 2024 and 40% for 2025. This declining rate means businesses should plan equipment purchases carefully to maximize these benefits. Understanding these thresholds and the eligibility of property is vital for reducing current-year tax liability and freeing up capital for reinvestment.

Understanding the Interplay of Section 179 and Bonus Depreciation

While both Section 179 and bonus depreciation provide immediate expensing for qualifying business assets, they operate under distinct rules and are often applied in tandem. Section 179 allows businesses to deduct a specific dollar amount of eligible property, subject to an annual limit (e.g., $1.22 million for 2025) and a taxable business income limitation. It is an elective deduction, meaning businesses choose which assets to apply it to. Bonus depreciation, conversely, is typically applied after Section 179 has been taken, covering the remaining depreciable basis of eligible property. For 2025, the bonus depreciation rate is 40%, and it generally has no income limitation, making it particularly useful for businesses with very large capital expenditures. The sequence is crucial: first, apply Section 179, then apply bonus depreciation to any remaining cost, and finally, regular MACRS depreciation for any residual basis. This layered approach ensures the maximum allowable write-off is achieved.

Frequently Asked Questions

What is the Section 179 deduction?

The Section 179 deduction is an IRS tax code provision that allows businesses to deduct the full purchase price of qualifying equipment and/or software placed in service during the tax year, rather than depreciating it over several years. This immediate expense deduction is designed to incentivize small and medium-sized businesses to invest in themselves, providing significant upfront tax savings and improving cash flow for operations.

How does Section 179 differ from bonus depreciation?

Section 179 and bonus depreciation both allow for accelerated expensing of assets, but they differ in key ways. Section 179 has an annual dollar limit and a business income limitation, and it's elected by the taxpayer for specific assets. Bonus depreciation, on the other hand, is a percentage deduction applied to the remaining cost of eligible property after Section 179, often with no income limit, and it applies automatically unless opted out.

What types of property qualify for Section 179?

Generally, qualifying property for Section 179 includes tangible personal property purchased for business use, such as machinery, computers, office furniture, certain vehicles (with specific limits), and off-the-shelf software. Certain qualified real property improvements like roofs, HVAC, fire protection, and alarm systems also qualify. The property must be used more than 50% for business.

What happens if my Section 179 deduction exceeds my business income?

If your Section 179 deduction exceeds your taxable business income, the excess amount cannot be deducted in the current year. Instead, it is carried forward to future tax years. This means you don't lose the deduction; you simply defer it until you have sufficient business income to utilize it, providing a long-term tax benefit that can be applied when your business is more profitable.