New 2018 capital expense rules

There are many provisions in the tax reform bill passed in late 2017 designed to benefit small business owners. There are also a variety of new tax tools affecting how small businesses account for deducting the cost of capital purchases under the new tax law. Here’s what you need to know:

Tool #1: Section 179 deduction
The new law increases the amount of business property purchases that you can expense each year under Section 179 to $1 million (from $500,000 previously). Normally, spending on business property (machines, computers, vehicles, software, office equipment, etc.) is capitalized and depreciated so that the tax benefit is spread out slowly over several years. Section 179 allows you to get the tax break immediately in the year the property is placed into service.


  • There is an eligibility phaseout for Section 179 that ensures it’s only used by small businesses, but that was also raised to $2.5 million (from $2 million) by the new law. If you spend more than $2.5 million on business property in total during the year, your ability to use the $1 million Section 179 deduction is reduced dollar-for-dollar above that amount.
  • Section 179 deductions can be used on both new and used equipment.
  • You can now use Section 179 on property used to furnish lodging or in connection with furnishing lodging (such as rental real estate). It also includes improvements to nonresidential real estate assets such as roofs, heating and air conditioning, and alarm systems.

Tool #2: Bonus depreciation
Bonus depreciation limits (also known as first-year bonus depreciation) are also improved under the new law, but for a limited time. Bonus depreciation is similar to Section 179 and allows you to immediately expense capital purchases rather than depreciating them over several years.

Under the new law, first-year bonus depreciation increases to 100 percent of the qualified asset purchase price for the next five tax years (starting in 2018) and can now be applied to the expense of purchasing used property as well as new.


  • Bonus depreciation is typically used on short-lived capital investments (with a 20-year or less useful life) such as machinery, equipment and software.
  • Bonus depreciation had been only for purchases of new equipment, but can now be applied to used equipment as long as you place it into service at your business during the tax year.
  • The allowable bonus depreciation starts to decline after 2022. It falls to 80 percent in 2023, 60 percent in 2024, 40 percent in 2025 and 20 percent in 2026.

Remember, though tax reform gives you expanded tools to accelerate depreciation, it may not benefit you to use them in every case. Sometimes it’s better to use the standard capitalization and depreciation tax treatment. These tax benefits do not change the amount a capital purchase can be expensed – only the timing. Calculating whether your business will benefit from these