TCJA - Many areas in need of guidance

The Tax Cuts and Jobs Act enacted December 22, 2017 includes a lot of new provisions. For example, Section 199A, is seven pages long in single space! It allows a deduction for owners of business activity (other than as a C corporation). The purpose is to also provide some rate reduction for businesses other than only a rate reduction for C corporations. The new rule is lengthy because it involves a lot of definitions and special rules. Now, while many business owners have income below the thresholds where they must deal with the complexity, just understanding the basics might be complete for many.

The AICPA Tax Section volunteers and staff have identified 39 areas in need of guidance (as an initial list). Most of these will require IRS work, such as to define terms. Some might be clarifications from Congress or the Joint Committee on Taxation as to what was intended by language that is not completely clear.

Here is the AICPA's January 29, 2018 letter listing various items. And the AICPA also noted in a letter to Congress on January 30, 2018 that IRS needs resources to provide timely guidance.

What do you think? Where do you think guidance is most needed?