What Is Bonus Depreciation?

Bonus depreciation is a tax incentive that allows businesses to immediately deduct a significant portion of the cost of eligible business property in the year it is placed into service. Rather than depreciating assets over their useful lives, companies can accelerate the deduction, improving cash flow and reducing taxable income in the short term. This provision is often used as a stimulus tool and has evolved over time through various tax laws.

How Bonus Depreciation Works

Depreciation is a method of allocating the cost of a tangible asset over its useful life. For example, a business that buys a $50,000 machine might normally depreciate that cost over seven years using the Modified Accelerated Cost Recovery System (MACRS). Bonus depreciation changes that schedule by allowing a larger portion — or even the entire amount — to be written off in the first year.

To qualify, the asset must meet certain criteria:

• It must be considered "qualified property" under the Internal Revenue Code.
• It must be used for business purposes more than 50% of the time.
• It must be placed in service during the specified timeframe defined under the law.

When bonus depreciation is applied, the business can deduct a percentage of the asset's cost up front, with any remaining cost subject to regular depreciation rules if applicable.

Historical Context and Legislative Changes

Bonus depreciation has been part of the U.S. tax code in various forms since the early 2000s. It was first introduced through the Job Creation and Worker Assistance Act of 2002, following the 9/11 attacks, as a way to stimulate business investment. Initially, it allowed for a 30% first-year deduction on qualified property.

The Jobs and Growth Tax Relief Reconciliation Act of 2003 increased the percentage to 50%. After lapsing and being reintroduced several times, bonus depreciation was made more generous under the Tax Cuts and Jobs Act (TCJA) of 2017.

Under the TCJA, businesses could deduct 100% of the cost of qualified property acquired and placed in service between September 27, 2017, and January 1, 2023. This represented full expensing and significantly influenced capital investment decisions across industries.

However, the provision was designed to phase down after 2022:

• 80% for property placed in service in 2023
• 60% in 2024
• 40% in 2025
• 20% in 2026
• 0% starting in 2027 (unless extended or modified by future legislation)

It's important to note that Congress has, in the past, extended or modified bonus depreciation in response to economic conditions, so these phase-out dates are not necessarily fixed.

Qualified Property

Bonus depreciation applies to tangible personal property with a recovery period of 20 years or less. This includes machinery, equipment, computers, furniture, and certain improvements to nonresidential real property. Specific categories that typically qualify include:

• New and used business equipment
• Certain types of vehicles used for business
• Improvements such as roofs, HVAC systems, and fire protection systems (when installed in commercial buildings and meeting specific criteria)

A key change under the TCJA was the inclusion of used property, as long as it was not previously used by the same taxpayer. Before that change, only new property qualified for bonus depreciation.

Some assets are explicitly excluded, such as buildings and other real estate, intangible assets like patents, and any property used outside the U.S.

Differences from Section 179 Expensing

Bonus depreciation is often confused with Section 179 expensing because both allow for accelerated deductions. However, there are key differences:

• Dollar Limits: Section 179 has annual limits on the amount that can be deducted, while bonus depreciation does not. For example, in 2025, Section 179 is limited to a maximum deduction of $1,220,000 with a phase-out threshold beginning at $3,050,000. Bonus depreciation has no such cap.
• Taxable Income Limitation: Section 179 deductions are limited to the business's taxable income, whereas bonus depreciation can create a net operating loss.
• Flexibility: Section 179 allows selective application, meaning businesses can choose which assets to expense. Bonus depreciation applies uniformly to all qualifying assets in a given class unless the taxpayer elects out.

Because of these differences, tax planners often evaluate both options to find the most beneficial mix for the business.

Strategic Considerations for Businesses

The ability to expense a large portion — or all — of an asset’s cost in the first year can lead to substantial short-term tax savings. This benefit is especially helpful for growing businesses making significant capital investments. However, there are strategic trade-offs to consider.

Accelerating depreciation reduces current-year taxable income, but it also means fewer deductions are available in future years. This can result in higher taxable income in later periods, especially if revenue does not keep pace. For some businesses, this might not be ideal if they expect to be in a higher tax bracket in future years.

Businesses also need to weigh the potential impact on financial statements, as accelerated depreciation may reduce book income, even if it increases cash flow by reducing taxes.

Moreover, businesses with tax losses or minimal taxable income may not benefit fully from bonus depreciation in the year of purchase unless the resulting net operating loss can be carried forward or backward under current tax rules.

The Bottom Line

Bonus depreciation is a powerful tax tool that allows businesses to recover the cost of qualifying property faster by front-loading deductions. While it has evolved through several pieces of legislation and is currently being phased out, it remains an important consideration for businesses investing in equipment or other depreciable assets. Understanding when and how to apply it — and balancing it with other deductions like Section 179 — can have a significant impact on a company's tax strategy and financial planning.