Anatomy of an IRS exam: from first letter to 30-day letter

A field examination of a business return follows a standard arc: an opening letter and conference, a series of information document requests (IDRs, Form 4564) seeking records, a Notice of Proposed Adjustment (NOPA, Form 5701) for each issue the examiner intends to change, and — if you disagree — a 30-day letter transmitting the exam report and offering a path to the IRS Independent Office of Appeals. For specialty-tax claims, the exam is where the study you bought either performs or does not.

The process rewards preparation and punishes improvisation, in roughly that order.

The sequence

The stages, what arrives, and the clock on each:

Behind it all runs the Section 6501 assessment statute — generally three years — which is why examiners request extensions (Form 872) in slow-moving credit cases. Extensions can be negotiated: restricted to specific issues, limited in length. The Taxpayer Bill of Rights applies throughout: the rights to be informed, to representation, to challenge the IRS's position, and to appeal in an independent forum are not courtesies but adopted IRS policy.

The NOPA stage is the underused one. It is the first written statement of the government's theory, and a focused rebuttal — facts, then authority — sometimes kills an issue before it reaches the report. Examiners working research credit cases follow audit techniques guides and IDR templates; expect requests for project lists, payroll mapping to business components, and the contemporaneous documentation described in audit readiness.

Dos and don'ts for specialty claims

Do:

• Assign one point of contact. Every document and answer flows through the CPA or attorney handling the exam. Casual conversations between examiners and engineers produce the record's worst sentences.
• Answer the IDR asked. Complete, timely, and exactly scoped. If a request is overbroad, negotiate its scope in writing before the due date rather than after.
• Produce the study with its workpapers. A credit study that cannot be tied to payroll records and project documentation reads as advocacy. The tie-out is the substantiation.
• Track the statute deliberately — both the assessment statute and, for amended-return claims, the refund statute, which keeps running on its own schedule.

Don't:

• Volunteer. Unrequested documents open unrequested issues.
• Let employees improvise in interviews. Prepare witnesses; truthful and prepared are compatible.
• Miss the 30-day deadline. It forfeits the pre-payment Appeals path and forces the choice into Tax Court posture.
• Treat penalties as automatic. Accuracy penalties require managerial approval and have real defenses; contest them from the first NOPA that mentions them.