Redpath Insights


Final Regulations for IRS Section 199A Deduction

by John Kammerer, CPA

January 22, 2019 โ€” On Friday, January 18, 2019, the IRS released final regulations under IRC Section 199A (the new 20% pass-through deduction). The regulation and accompanying guidance are largely similar to the proposed regulations issued in August with a few important clarifications and changes.


Beginning in 2018, owners of pass-through entities and sole proprietorships are allowed a deduction equal to the lesser of 20% of qualified business income or 20% of taxable income less capital gains.  Qualified business income is generally defined as income from a trade or business that is effectively connected with the United States other than a specified service trade or business or the trade or business of performing services as an employee. Items classified as investment income are not eligible for the 20% deduction.

Married taxpayers with taxable income above $315,000 ($157,500 for other taxpayers) must generally limit their deduction to the greater of 50% of their share of W-2 wages of the business or the sum of 25% of their share of W-2 wages plus 2.5% of their share of the unadjusted basis of โ€œqualified propertyโ€. Taxpayers with income below the threshold are not subject to the above test and can also treat income from a specified service trade or business as eligible income.

Key Changes and Clarifications

The final regulations clarified a number of items from the proposed regulations and made a few significant changes. Some key items in the proposed regulations were outlined in a previously posted article, โ€œProposed Regulations Issued on New 20% Pass-through Deductionโ€.

Aggregation Rules

The final regulations retained and expanded the aggregation rules allowing taxpayers to treat two or more separate businesses as one for purposes of the IRC 199A calculation. Aggregation is key to maximizing the 20% pass-through deduction for businesses that would otherwise be limited by the wage and/or wage and property limitations. The tests for determining whether the businesses are eligible to be aggregated are largely the same, however; they did clarify the family and other attribution rules and made a minor modification to the definition used to determine whether the businesses are integrated and part of a larger enterprise. The biggest change is that aggregation can now be done at the entity level rather than just the individual and trust level.

Trade or Business Requirement

A major question that was not addressed in the proposed regulation related to determining when a business is considered to rise to the level of a โ€œtrade or businessโ€ for purposes of IRC 162 which is necessary to be eligible for the 20% pass-through deduction. While the IRS did not provide a set of tests or other clarification that can be applied in all situations, the IRS did provide a safe harbor (Notice 2019-07) that rental real estate operations can use to provide certainty that they are eligible for the 20% deduction. There are a number of requirements and not all rental real estate operations will be able to avail themselves of the safe harbor. A detailed summary of the requirements can be found in an article by Alex Helkamp, CPA.

The proposed regulations had an exception to the โ€œtrade or businessโ€ requirement if the rental or licensing of the property was to a trade or business that was commonly controlled. The final regulations retain this exception but clarify that the exception is not available in situations where the rental or licensing is to a commonly controlled C corporation.

Unadjusted Basis of Qualified Property

For taxpayers above the taxable income threshold, the 20% pass-through deduction is limited to the greater of 50% of W-2 wages or 25% of W-2 wages plus 2.5% of the unadjusted basis of qualified property. Under the proposed regulations, the special partnership basis adjustments under IRC 743 or 734 (basis increases to partnership property and treated as additional property placed in service as a result of certain sales or exchanges) were not eligible to be included in the calculation.  The final regulations changed this rule in the context of IRC 743 and allow it in the calculation of qualified property to the extent it represents an increase over the original cost (not to the extent the partnershipโ€™s basis was reduced via depreciation which avoids double counting) of the property.

The final regulations also modified the rules for nontaxable transfers (such as tax-free contributions to a partnership or corporation or like kind exchanges).  The final regulations allow the UBIA calculation to include the original cost of property contributed to a partnership or corporation in a tax-free exchange rather than the reduced basis (i.e. original cost reduced by depreciation) as required in the proposed regulations.

Specified Service Trade or Businesses (SSTB)

The proposed regulations eliminated two anti-abuse rules treating businesses that would be eligible for the 20% pass-through deduction as specified service businesses if they transacted with related party specified service trade or businesses. The remaining anti-abuse rule provides that if there is 50% or more common ownership between two businesses and one is a specified service trade or business, the portion of the business providing services to the SSTB will be treated as a separate SSTB.

The final regulations also clarified the de minimis rule, which provides that a business is not a SSTB if less than 10% of the gross receipts (5% if the gross receipts are over $25 million) are performed in fields that would be treated as an SSTB. The regulations clarify that if the SSTB activity can be properly treated as a separate trade or business under IRC 162, then the qualifying activity can be reported as eligible even if the SSTB is in excess of the de minimis rule threshold.


There are a number of other changes and clarifications in the final regulations that can impact taxpayers. Taxpayers are permitted to rely on either the final regulations (in their entirety) or the proposed regulations (in their entirety) for years ending in calendar year 2018.

John Kammerer, CPA

John Kammerer, CPA

John Kammerer is a partner at Redpath and Company and holds a seat on the firmโ€™s board of directors. He leads the firmโ€™s business tax and M&A service areas, assisting clients with tax planning and preparation, research, entity structuring, and M&A transactions. John works with a variety of clients in industries such as manufacturing, construction, real estate, and professional services. He is a frequent presenter on topics of business taxation and entity structuring. John is also a member of the S Corp Association advisory board and is actively involved with the group to promote and support tax policies that positively impact S Corporations and privately-held businesses. John graduated from Winona State University with a Bachelor of Science degree in Accounting. He is a member of the American Institute of Certified Public Accountants (AICPA) and the Minnesota Society of Certified Public Accountants (MNCPA). He has provided public accounting services at Redpath and Company since 2004.

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