The rules the exam tests
| Rule | What it says (2025) | Source |
|---|---|---|
| Exam types | Correspondence, office, field | Pub 556 |
| Time and place | IRS sets a reasonable time and place | IRC 7605(a) |
| One inspection rule | Books examined once per year unless notice given | IRC 7605(b) |
| Right to consult | Interview suspended on request (except summons) | IRC 7521(b)(2) |
| 30-day letter | Agree, or request Appeals within 30 days | Pub 5 |
| Protest | Formal written protest if > $25,000 per period; small case request otherwise | Pub 5 |
| 90-day letter | Notice of deficiency; 90 days (150 abroad) to petition; no assessment meanwhile | IRC 6212, 6213 |
| Small tax case | <= $50,000 per year; not appealable | IRC 7463 |
| Burden of proof shift | Credible evidence + substantiation + cooperation | IRC 7491 |
| EA privilege | Noncriminal tax advice only | IRC 7525 |
| Audit reconsideration | After assessment with new information; not after Tax Court decision or closing agreement | IRS |
Facts: A field exam proposes a $40,000 deficiency for 2023. The client disagrees with $30,000 of it.
Path: Sign a partial agreement for the $10,000 conceded issue (stops interest on that part), and within 30 days file a formal written protest (over $25,000) requesting Appeals. If Appeals cannot settle, the IRS issues a 90-day letter and the client has 90 days to petition the Tax Court; with $30,000 in dispute she may elect small tax case (S case) procedures, whose decisions cannot be appealed.
Exam traps
- The Tax Court deadline is 90 days (150 abroad) from the notice of deficiency, and it cannot be extended.
- Protest threshold is $25,000 per period; S-case limit is $50,000 per year.
- EAs cannot argue in Tax Court unless admitted.
- Audit reconsideration is unavailable after a Tax Court decision.
Audits, the 30-day letter, appeals and the 90-day letter: 10 free practice questions
Audits, the 30-day letter, appeals and the 90-day letter practice questions
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Frequently asked questions
What is a 90-day letter?
A statutory notice of deficiency. You have 90 days (150 if outside the U.S.) to petition the Tax Court before the IRS can assess.
Do I need a written protest to go to Appeals?
Yes, a formal written protest if more than $25,000 is at issue for any period; a small case request otherwise.
Sources
- IRS Publication 556 - Examination of Returns, Appeal Rights, and Claims for Refund (accessed 2026-09-23)
- IRS Publication 5 - Your Appeal Rights and How to Prepare a Protest (accessed 2026-09-23)
- IRS - SEE Part 3 content specifications (Representation, Practices and Procedures) (accessed 2026-09-23)
- IRS - Enrolled agents: Frequently asked questions (accessed 2026-09-23)