Proposed regulations: How much weight should tax pros give them?

Tax professionals spend a lot of time interpreting guidance that falls somewhere between a new law and a final rule. One of the most common examples is proposed regulations. They appear regularly after Congress passes tax legislation, and they often provide the first detailed explanation of how the Treasury Department and IRS believe a law should work.

But proposed regulations raise an important question: How much weight should practitioners actually give them? The answer is more nuanced than many practitioners may assume.

What are proposed regulations?

Proposed regulations are the government's preliminary interpretation of tax law. They are issued by the Treasury Department and IRS to explain how a statute should be applied in practice.

Before regulations become final, the government generally publishes proposed regulations and invites comments from tax professionals, businesses, industry groups and other stakeholders. Public hearings may also be held before final regulations are issued. This process gives practitioners an opportunity to identify unintended consequences, administrative burdens and technical concerns before the rules become permanent. In many cases, proposed regulations provide the earliest roadmap for understanding new legislation.

Proposed regulations are not final law    

One of the most important principles for tax professionals to remember is that proposed regulations generally do not carry the force of law. Unlike final regulations, proposed regulations are not binding on taxpayers unless Congress specifically provides otherwise or the IRS expressly permits reliance in the regulation's preamble. 

That distinction matters when advising clients or supporting positions on a tax return. A proposed regulation may indicate how the IRS intends to enforce a provision, but it does not automatically establish a taxpayer's legal obligation. Tax professionals should carefully review whether reliance is permitted before treating proposed guidance as authoritative.

Why proposed regulations still matter

Even though they are not binding, proposed regulations should never be ignored. They provide valuable insight into the IRS's current interpretation of the law and often signal what future enforcement may look like. Examiners, appeals officers and IRS attorneys frequently view proposed regulations as evidence of the agency's position on an issue.

For that reason, proposed regulations can influence risk assessments, planning decisions and client communications.

When practitioners understand the direction the IRS is heading, they can help clients prepare for future compliance requirements and avoid surprises when final regulations are issued. 

The penalty consideration

Tax professionals should also consider potential penalty implications when taking a position contrary to a proposed regulation. Under Circular 230 standards and other penalty rules, positions that conflict with proposed regulations may require additional support. Practitioners may need to demonstrate a reasonable basis for the position and determine whether disclosure requirements apply.

This does not mean a position contrary to proposed regulations is automatically incorrect. However, it does mean the position should be carefully analyzed and documented. A well-supported position grounded in statutory language, legislative history or other authoritative guidance may still be defensible. The key is understanding and managing the associated risk.

An opportunity to shape the rules

Perhaps the most overlooked aspect of proposed regulations is the opportunity they create for professional input. The comment period gives tax professionals a direct voice in the regulatory process. Written comments and public testimony can influence how final regulations are drafted and implemented. For practitioners working with clients affected by a proposed rule, participation in the comment process can help improve clarity and reduce compliance burdens across the profession. 

Proposed regulations occupy an important middle ground. They are not final law, yet they offer valuable insight into how the IRS interprets and intends to administer the tax code. Tax professionals should not treat proposed regulations as automatically binding. At the same time, dismissing them entirely can create unnecessary risk. The most effective approach is to understand their authority, evaluate the possibility of reliance, assess compliance risks and stay engaged as regulations move toward finalization.