Equipment depreciation calculator

Equipment Depreciation Calculator for Contractors

Buying a major piece of equipment — an excavator, a crane, a fleet vehicle — is one of the largest capital decisions a contractor makes. The federal tax code provides significant incentives to accelerate depreciation through Section 179 expensing, bonus depreciation, and MACRS. Understanding how these interact determines your Year 1 tax deduction and your cash flow in the years that follow.

MACRS: The Standard Method

Without any special elections, business equipment is depreciated under MACRS using a double-declining balance (200% DB) method. The IRS assigns recovery periods based on asset class: most construction equipment is 5-year property, office furniture is 7-year, land improvements are 15-year. The half-year convention applies to most situations — the IRS assumes you placed the asset in service at the midpoint of the year, regardless of the actual purchase date.

MACRS rates for 5-year property (half-year convention): 20% in year 1, 32% in year 2, 19.2% in year 3, 11.52% in year 4, 11.52% in year 5, 5.76% in year 6. Note that 5-year property takes six tax years to fully depreciate because of the half-year convention splitting the first and last year.

Section 179: Immediate Expensing

Section 179 of the Internal Revenue Code allows you to deduct the full cost of qualifying property in the year it's placed in service, up to the annual dollar limit ($1,220,000 for 2024). The critical constraint: the Section 179 deduction cannot exceed your business taxable income for the year. If you don't have enough income to absorb the deduction, the excess carries forward to future years. Section 179 cannot create a loss — it's a limit equal to your taxable income from active business.

Bonus Depreciation: The TCJA Phase-Down

The Tax Cuts and Jobs Act (TCJA) of 2017 introduced 100% first-year bonus depreciation with no dollar cap. Unlike Section 179, bonus depreciation can create a net operating loss (NOL). The phase-down schedule under current law:

• 2022: 100% bonus depreciation
• 2023: 80%
• 2024: 60%
• 2025: 40%
• 2026: 20%
• 2027 and beyond: 0% (unless Congress extends)

For a contractor buying a $150,000 excavator in 2024: with 60% bonus depreciation and no Section 179 election, you deduct $90,000 in year one. The remaining $60,000 depreciates over 5-year MACRS. If you also make a Section 179 election for the full $150,000 (assuming sufficient income), you deduct the entire $150,000 in year one.

Section 179 vs. Bonus: Which to Use?

The strategies aren't mutually exclusive — you can use both on the same asset. The general approach:

• Use Section 179 first, up to your business taxable income limit
• Apply bonus depreciation to the remaining basis if the rate is still meaningful
• If you expect higher income in future years, it may be better to spread deductions using MACRS
• If you're in a state that doesn't conform to bonus depreciation, the state add-back may reduce your benefit

What Qualifies (and What Doesn't)

Section 179 and bonus depreciation apply to tangible personal property: equipment, machinery, computers, vehicles. Real property — buildings, structural components, land — does not qualify for either. The recovery period matters: 5-year property (most construction equipment, light trucks, computers) and 7-year property (office furniture, equipment not in another class) are the most common for contractors. Land improvements are 15-year property. Buildings are 39-year nonresidential real property and depreciate only on straight-line — no accelerated methods available.

Half-Year Convention and Mid-Quarter Exception

The half-year convention treats all personal property as placed in service at the midpoint of the tax year, giving you half a year's MACRS deduction in year one regardless of when you actually bought the asset. The exception: if more than 40% of your total personal property acquisitions for the year are placed in service in the fourth quarter, the mid-quarter convention applies, which can significantly reduce your year-one deduction for assets placed in service early in the year. If you're buying expensive equipment in Q4, be aware of this rule.