C Corporations – Tax Reform Affecting Tax Planning

Sep 28, 2018Business, Business Consulting, Business Tax

One of the biggest changes under the Tax Cuts and Jobs Act (TCJA) is the permanent installation of a flat 21% federal income tax rate for C corporations for tax years beginning after 2017. The new 21% rate applies equally to personal service corporations (PSCs). (Under prior law, PSCs were taxed more heavily than other C corporations.)

This is great news if you own or manage a C corporation, including a PSC. Here are specific tax planning considerations for these entities under the TCJA:


With the reduced federal income tax rate for C corporations, tax planning is now much easier, because you know this year’s rate and next year’s rate: 21%. Therefore, the generally appropriate strategy is to defer income into next year and accelerate deductible expenditures into this year. That way, you postpone corporate federal income tax bills.

Most small and medium businesses are now allowed to use cash-method accounting for tax purposes, thanks to other changes included in the TCJA. Assuming your business is eligible, cash-method accounting gives you flexibility to manage your corporation’s 2018 and 2019 taxable income to defer some corporate federal income tax until next year.

Examples of ways to defer income include:

Delaying invoices. On the income side, the general rule for cash-basis taxpayers is you do not have to report income until the year you receive payment. To take advantage of this rule, put off sending out some invoices so your corporation does not get paid until early next year. Of course, you should never do this if it raises the risk of not collecting your money.

Charging recurring expenses before year end. You can charge recurring business expenses that your corporation would otherwise pay early next year on credit cards. Cash-basis taxpayers can claim 2018 deductions even though the credit card bills won’t be paid until next year. However, this favorable treatment does not apply to store revolving charge accounts. For example, you cannot deduct business expenses charged to your Sears account until you pay the bill.

Paying expenses with checks and mail them a few days before year end. The tax rules say cash-basis taxpayers can deduct the expenses in the year checks are mailed, even though they won’t be cashed or deposited until early next year. For big-ticket expenses, send checks via registered or certified mail. That helps prove they were mailed this year.

Prepaying expenses for next year. Cash-basis taxpayers can deduct prepaid expenses in the current tax year as long as the economic benefit from the prepayment does not extend beyond the earlier of: 

  1. ) 12 months after the first date on which your company realizes the benefit, or 
  2. ) the end of your company’s 2019 tax year (the tax year following the year in which the payment is made).

For example, this rule allows your company to claim 2018 deductions for prepaying the first three months of next year’s office rent or the premium for property insurance coverage for the first half of next year.


For qualified property acquired and placed in service between September 28, 2017, and December 31, 2022 (or December 31, 2023 for certain property with longer production periods and aircraft), the TCJA increases the first-year bonus depreciation percentage to 100% (from 50% for most of 2017). This break is allowed for both new and used qualified property. As long as 100% first-year bonus depreciation is allowed, it is superior to the Section 179 deduction privilege (explained below), because there are fewer restrictions on bonus depreciation.


For qualifying property placed in service in tax years beginning after December 31, 2017, the TCJA permanently increases the maximum Section 179 deduction to $1 million (from $510,000 for tax years beginning in 2017). The Sec. 179 deduction phase-out threshold also has been increased to $2.5 million (from $2.03 million under prior law). Both amounts can be adjusted for inflation in future years.

In addition, the TCJA expands the definition of eligible property to include certain depreciable tangible personal property used predominantly to furnish lodging. Examples of such property include beds, other furniture, kitchen appliances, and other equipment used in the living quarters of a lodging facility such as an apartment house, dormitory or any other facility (or part of a facility) where sleeping accommodations are provided and rented out.

The definition of qualified real property eligible for the Sec. 179 deduction is further expanded to include qualified expenditures for roofs, HVAC equipment, fire protection and alarm systems, and security systems for nonresidential real property.

As under prior law, Sec. 179 deductions can still be claimed for qualifying real property expenditures, up to the maximum annual allowance ($1 million for tax years beginning in 2018). There’s no separate limit for real property expenditures, so Sec. 179 deductions claimed for real property reduce the maximum annual allowance dollar for dollar.


Purchasing large SUVS, pickups and vans can provide major tax advantages. Thanks to the unlimited 100% first-year bonus depreciation break for qualified assets that are acquired and placed in service between September 28, 2017, and December 31, 2022, you can generally write off 100% of the cost of a new or used heavy SUV, pickup or van that’s acquired and placed in service in current tax year on this year’s corporate tax return.

To cash in on this favorable tax treatment, you must buy a “heavy” vehicle with a manufacturer’s gross vehicle weight rating (GVWR) above 6,000 pounds. First-year depreciation deductions for lighter SUVs, trucks, vans and passenger cars are much skimpier. You can usually find a vehicle’s GVWR specification on a label on the inside edge of the driver’s side door where the hinges meet the frame.

For example, suppose your C corporation buys a $65,000 heavy SUV in 2018. You can write off the entire $65,000 cost in the current tax year thanks to the 100% first-year bonus depreciation break. This break is available for both new and used heavy vehicles.

In contrast, suppose your corporation spends the same $65,000 on a car or a light pickup or van. In this scenario, the first-year depreciation write-off will be only $18,000, including $8,000 of first-year bonus depreciation.


As its name implies, the new tax law includes many provisions that help C corporations cut their tax bills. In many ways, it also simplifies tax planning for C corporations. A Smith Schafer professional can supply more details on what is covered here and suggest other creative tax-planning moves for your business. 


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