REG-103193-26, June 1, 2026

The Internal Revenue Service (IRS) has issued a notice of proposed rulemaking (REG-103193-26) that will directly impact tax practitioners and executors managing decedent estates. The Treasury Department is proposing an increase in the user fee required for authorized persons requesting the issuance of an estate tax closing letter (also known as IRS Letter 627).

The Proposed Change

If the proposed regulations are finalized, the user fee for an estate tax closing letter will rise from the current $56 to $76.

This represents a notable increase from the previous fee structure. For context, the fee was $67 in 2021, was adjusted down to $56 following a 2023 cost model (effective December 1, 2025), and is now being proposed at this new higher rate of $76 based on the IRS's most recent biennial review.

Why the Increase? The Cost Model Breakdown

The impetus for this change stems from the Independent Offices Appropriations Act of 19ESS and OMB Circular A-25, which require federal agencies to review user fees biennially and update them to ensure they reflect the full cost of providing a service that confers special benefits on identifiable recipients.

In its 2025 biennial review, the IRS determined that the actual operational cost of maintaining the estate tax closing letter program has risen. The proposed $76 fee is derived from a comprehensive "full cost" calculation:

Total Program Cost: The IRS calculated the total annual cost for the program to be approximately $615,593.
Labor and Benefits: This includes the direct labor costs of processing requests (performed by employees at GS-5, GS-8, and GS-11 levels) as well as quality assurance (QA) reviews conducted by IR-10 and IR-06 payband professionals.
Overhead Allocation: The calculation includes a significant overhead charge of 62.92%, which covers indirect costs such as IT, administration, rent, and human resources.
Volume-Based Calculation: By dividing this total annual cost by the estimated annual volume of approximately 8,053 requests, the IRS arrived at the $76 per-request figure.

What This Means for the Program

The service in question remains the formal process through which authorized persons can request an official letter from the IRS confirming that the estate tax liabilities have been addressed. The program involves a multi-step internal process:

Request Processing: Review of returns and preparation of letters by GS-level staff.
Quality Assurance: A sampling process to verify authorization, accuracy of information, and correct addressing.

While the IRS notes that these regulations will not have a significant economic impact on "small entities" (as most decedent estates do not meet the definition of a small entity under 5 U.S.C. 601(6)), the increased cost is an additional administrative expense that must be factored into estate settlement budgets.

Effective Date and Next Steps

The proposed regulations are not yet law. The Treasury Department and the IRS are currently seeking public comments on all aspects of the proposal.

When will this take effect? If the regulations are finalized in their current form, the new $76 fee will apply to all requests for an estate tax closing letter received by the IRS on or after the date that is 30 days after the date the final regulations are published in the Federal Register.

Tax professionals should monitor the Federal Register for the publication of the final rule to ensure accurate billing and budgeting for clients currently navigating the estate administration process.

Prepared with assistance from LM Studio google/gemma-4-26b-a4b.