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What Should Business Owners Know About the Section 199A Deduction?

The Tax Cuts and Jobs Act of 2017 (TCJA) made comprehensive changes to the tax code. It’s not surprising that the IRS is in the process of making clarifications to these changes, including proposed regulations for the complex Section 199A deduction.

This is an important deduction against income tax of up to 20 percent of qualified business income (QBI) from a domestic business operated as a sole proprietorship, partnership, S-corporation, trust or estate. The following information summarizes the regulations.


Under the TCJA, QBI eligible for the deduction is all ordinary income earned in a trade or business, but it does not include shareholder wages, guaranteed payments or capital gains, even if they are earned from a pass-through entity.

The 199A deduction is available to eligible taxpayers for the first time on the 2018 federal income tax return they will file in 2019. Taxpayers may rely on the rules in the proposed regulations until final regulations are published in the Federal Register.

Income Thresholds

In determining how the deduction will apply, there are two brackets of individuals that taxpayers must be aware of:

  • taxpayers who have taxable income below $315,000 married filing jointly (MFJ) or $157,500 all other filers (AOF)
  • those who have taxable income above $415,000 (MFJ) or $207,500 (AOF).

For taxpayers with taxable income between these two amounts, the 199A deduction applies, but is subject to certain phase-outs. For taxpayers with taxable income below the initial threshold, the 199A deduction applies regardless of profession or business activities performed. Simply said, these taxpayers get the 199A deduction without limitation.

However, for taxpayers with taxable income above the second threshold, the profession or business activity performed by the taxpayer must be considered. The IRS has indicated that taxpayers involved in health, law, accounting, actuarial sciences and certain other professions do not get any 199A deduction once their income exceeds the second threshold.

Taxpayers with income falling between the first and second thresholds received a reduced deduction. All other taxpayers who do not work in the lines of service specifically disallowed by the IRS continue to get the deduction, without any phaseout, even after their income exceeds the second threshold.

Taxpayers who have taxable income above the $315,000 MFJ/$157,500 AOF threshold amounts and are not in a disallowed service line still aren’t completely in the clear. The 199A deduction will be limited to the greater of 50 percent of their W-2 wages, or the sum of 25 percent of their W-2 wages, plus 2.5 percent of the unadjusted basis of qualified property.


There are three ways to calculate wages to determine what the starting point of the W-2 wage limitation will be:

  1. The simplest way to calculate total wages for the purpose of this limitation is to take the lesser of all the wages reported in box 1 of the employee’s W-2s or the total wages reported in box 5 of the W-2s.
  2. making adjustments to box 1 of the W-2 for employee contributions to qualified plans
  3. determining wages subject to federal income tax withholding

Once the taxpayer has properly calculated wages, they must then compare the amount of their 199A deduction to 50 percent of the wages they calculate. The 199A deduction cannot be higher than 50 percent of the wages and is thus limited to that amount.

Taxpayers who don’t have a substantial amount of W-2 wages but do have an adequate amount of property can use the 25 percent of wages (as calculated above) plus 2.5 percent of the unadjusted basis of qualified property.

To help calculate the unadjusted basis of qualified property, taxpayers will need to look at their fixed asset records at year-end and take 2.5 percent of the cost basis (pre-depreciation) for assets other than land and assets purchased within the last 60 days of year-end.

For taxpayers who have multiple pass-through entities that may be limited by either 50 percent of wages or 25 percent of wages and 2.5 percent of qualified property, there may be some benefit in looking to aggregate their ownership in these entities for the purposes of the 199A deduction.

The new 20 percent deduction of your QBI is a significant outcome of the tax reform act, as long as you understand how it can be applied. There are several complexities surrounding the deduction, particularly if your income exceeds the threshold.

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© 2017 CPA ContentPlus

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Biz Tip Topic Expert: Jacob Peters, CPA, MST

Jacob Peters, CPA, MST

Jake is a Principal with SVA Certified Public Accountants. He uses his extensive experience to provide clients with guidance and consulting in areas such as federal and state income tax planning, debt forgiveness, Roth IRA conversions, energy efficiency tax incentives, and multi-state tax compliance.

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