What Is Tax Assessment Reconsideration and How Does It Work?

Tax assessment reconsideration is the IRS process for reviewing a previously completed audit or adjustment when a taxpayer can provide new or corrected information that affects the liability. It’s not the same as filing an appeal or taking a case to Tax Court; instead, it asks the IRS to reopen the administrative file and recompute the tax based on the additional evidence you supply (IRS: Audit Reconsideration). If the IRS accepts the new information, your assessment may be reduced or reversed.

In my practice as a CPA, I use reconsideration when clients receive an assessment and we discover documents after the audit—like missing Form 1099s, bank records, or corrected W-2s—that clearly change taxable income or deductible amounts. Reconsideration is most effective when the new evidence directly addresses the issues the auditor relied on.

How this differs from Appeals and other remedies

  • Audit reconsideration vs. Appeals: Appeals is a formal independent review by the IRS Office of Appeals and is usually available if you timely protested the auditor’s findings (see our guide on Tax Appeals). Reconsideration is administrative and focuses on reopening the audit file to factor in new facts, not negotiating disputed law or applying hazards of litigation.
  • Audit reconsideration vs. Collection appeals: If a collection action is underway (levy or lien), you may have separate protections like Collection Due Process (CDP) or an offer in compromise. Reconsideration won’t replace those processes.

For a quick primer from the IRS, see the Audit Reconsideration page on IRS.gov and the IRS Appeals page for separate appeal rights (IRS: Audit Reconsideration; IRS: Appeals).

When to Ask for Reconsideration

Ask for a tax assessment reconsideration when:

  • You have new documentary evidence that wasn’t available to the auditor (e.g., corrected 1099s, canceled checks, bank reconciliations).
  • The IRS made a mathematical error or misapplied a deduction or exclusion.
  • You filed corrected returns or amended returns after the audit and those corrections materially change the tax.
  • The assessment resulted from identity theft or fraud producing false income records.

Do not use reconsideration simply to reargue positions already considered without new evidence. If you disagree with a legal interpretation rather than a factual mistake, an appeal may be the proper path. See our internal resource Tax Appeals: How to File and Succeed in an IRS Appeal for procedural differences and strategy.

Step-by-step: How to submit a strong reconsideration request

  1. Read your IRS notice carefully. Identify the assessment date, CP or audit report reference, and any statutory deadlines. If you have a statutory notice of deficiency (a 90-day/150-day notice), you may need to pursue Tax Court or Appeals instead of reconsideration.

  2. Collect clear, organized evidence. Typical items:

  • Corrected W-2s or 1099s and issuer correspondence
  • Bank statements and reconciliations
  • Receipts, invoices, canceled checks
  • Signed statements or affidavits explaining timing or context
  • A copy of your original return and any amended returns

  1. Prepare a concise cover letter. Explain: the assessment you seek to change, why the new evidence matters, and the specific entries or calculations to be recomputed. Number exhibits and cross-reference the IRS adjustments. A cover letter that frames the issue clearly speeds internal handling.

  2. Submit the request to the address or unit identified on your notice. If the notice directs to a particular audit office or collection unit, follow that instruction. If unsure, call the IRS contact number on the notice or use the Audit Reconsideration contact information on IRS.gov (IRS: Audit Reconsideration).

  3. Keep detailed records of submission: certified mail receipt or proof of delivery, courier tracking, and copies of every document.

  4. Respond promptly to any IRS follow-up. The IRS may ask for clarification or additional documents. Cooperate and provide the requested items quickly.

What the IRS will do

The IRS will review the new documentation and either:

  • Recompute the assessment and issue a revised notice (reducing or eliminating liability), or
  • Determine that the new evidence does not change the prior findings and issue a decision sustaining the original assessment.

Timing varies. Simple cases may be resolved in weeks; complex cases with significant document review can take months. If the IRS reopens and changes the assessment, you may receive a refund or an adjusted balance due.

Real-world examples (anonymized)

  • Freelancer: A freelance graphic designer received an audit adjustment increasing income. After locating missing 1099s and bank transfer records demonstrating non-taxable reimbursements, we submitted a reconsideration packet with reconciliations and a narrative. The IRS recomputed the assessment and removed the disputed income.

  • Small business: A local contractor faced an assessment driven by employee misclassification. After assembling payroll records, corrected Forms W-2, and a written explanation of pay arrangements, the IRS accepted the corrections and reduced assessed payroll taxes.

These examples show the power of timely, factual documentation. In my experience, well-organized evidence that directly addresses an auditor’s specific finding is the most persuasive.

What to include (practical checklist)

  • Cover letter stating the request and desired recomputation
  • Copy of the IRS notice or audit report
  • Original tax return and any amended returns
  • All supporting documentation sorted by issue (label exhibits)
  • Any corrected forms from third parties
  • Power of Attorney (Form 2848) if you’re represented

Common mistakes taxpayers make

  • Waiting too long to submit new evidence. While reconsideration can sometimes be requested outside appeal windows, earlier submission improves outcomes.
  • Sending loosely organized records. Unclear packets slow IRS review and reduce persuasion.
  • Confusing reconsideration with an appeal. If your issue is legal interpretation or you timely protested, file a protest to Appeals instead.
  • Failing to keep copies of everything sent.

If the IRS denies the reconsideration

If the IRS declines to change the assessment, you still have options depending on timing and the type of notice originally issued:

  • File an appeal with the IRS Office of Appeals if you have preserved appeal rights (see our Tax Appeals guide).
  • If you received a statutory notice of deficiency, you generally have 90 days (150 if abroad) to petition the U.S. Tax Court.
  • If the IRS moves to collect, consider Collection Due Process (CDP) rights or other collection remedies like an Offer in Compromise; consult our working with collections article for options.

Working with a representative

A tax attorney, enrolled agent, or CPA can prepare the packet, frame legal arguments, and liaise with the IRS. If you use a representative, file IRS Form 2848 (Power of Attorney) so the IRS can discuss the case with your agent.

Timing, deadlines and statute of limitations

Statutory limits still matter. Even if you request reconsideration, refunds claimable beyond the normal statute (generally three years from filing or two years from payment) may be restricted. If you owe tax and the IRS has assessed, collection statutes and appeal windows could affect enforcement actions. Check the IRS Audit Reconsideration page and consult a tax advisor about limits for your specific case (IRS: Audit Reconsideration).

Helpful IRS and advocacy resources

Further reading on FinHelp:

Bottom line

Tax assessment reconsideration is a practical, evidence-driven way to ask the IRS to recompute a prior assessment when you have new or corrected information. It’s most effective for factual errors—missing documents, corrected forms, or math mistakes—not for purely legal disputes. If you’re unsure which path fits your situation, consult a qualified tax professional promptly; acting quickly preserves options and strengthens the chance of a favorable outcome.

Disclaimer: This article is for educational purposes only and does not constitute tax advice. For guidance tailored to your situation, consult a licensed tax professional or the IRS.