Quick overview

An IRS information request (commonly issued as a notice or letter) asks you to verify items on a past tax return. Typical reasons include mismatched income, large deductions, credits, or missing forms. Responding correctly and on time—usually within 30 days—limits financial risk and keeps the case moving toward resolution.

My guidance below reflects more than 15 years advising individuals and small businesses. I’ve handled hundreds of correspondence- and office-based inquiries. The practical steps I recommend are conservative, documental, and aligned with IRS guidance such as Publication 556 and the IRS guide to notices and letters (see sources). This article is educational only and not personalized tax advice; consult a CPA or tax attorney for specific cases.

Step-by-step best practices

  1. Read the notice word-for-word
  • Identify the notice/letter number, tax year, and the specific items the IRS wants. The notice will list a deadline and usually a preferred response method. Follow those instructions exactly.
  1. Note the deadline and calculate buffer time
  • Most correspondence requests give 30 days to respond; some provide 60 days. The IRS may grant a written extension in limited circumstances—ask early and in writing. (IRS Publication 556 explains appeal and response timelines.)
  1. Gather only the documents requested — but be thorough
  • Collect tax returns, W-2s, 1099s, bank statements, receipts, invoices, canceled checks, and ledgers that directly support the item(s) under inquiry. Avoid sending unrelated papers that can confuse the examiner.
  1. Prepare a concise cover letter
  • Include: taxpayer name, Social Security number or EIN (last 4 digits if privacy concerns), tax year, notice number, your daytime phone number, and a one-paragraph explanation of what you are sending and why. List the documents you include with page numbers.
  1. Send copies, not originals (unless the IRS asks for originals)
  • Keep original records at home or in your office. If an IRS agent specifically requests an original, state that you will provide it at a scheduled meeting or produce it upon request but retain a copy for your file.
  1. Use a verifiable delivery method
  • Follow the notice’s preferred method. If not specified, send by certified mail with return receipt or a tracked courier. Electronic submissions are sometimes available; only use IRS portals or methods explicitly named on the notice.
  1. Keep a complete log
  • Note the date you mailed or uploaded, tracking numbers, who you spoke to (name, badge number), and any confirmation numbers. Save a clean, organized copy of what you sent.
  1. Consider professional representation
  • If the request is complex, involves substantial tax amounts, or you expect dispute, hire a CPA, EA, or tax attorney and consider giving them limited Power of Attorney using Form 2848. A tax pro can reduce missteps and handle communications.

Practical documentation checklist

  • Tax return for the year in question (filed copy)
  • That year’s W‑2s, 1099s, K‑1s
  • Bank and credit card statements tied to claimed deductions
  • Receipts, invoices, canceled checks, contracts
  • Mileage logs, appointment books, or calendars supporting business travel
  • Payroll records if payroll taxes are questioned
  • A reconciliation memo showing how figures on your return match your supporting records

For additional recordkeeping tips, see our guide on Top Tax Recordkeeping Practices to Speed Up Refunds and Audits.

Timelines and extensions — realistic expectations

  • Standard correspondence requests: commonly 30 days from date on the notice. Some notices give 60 days. Always confirm the stated deadline on the notice itself.
  • Extension requests: The IRS may allow extra time if you request it before the deadline, typically in writing explaining the reason and providing a proposed date. Extensions are discretionary—request early.
  • After you submit: The IRS will review and either accept your documentation, propose adjustments (with a proposed change and new balance due), or request more information. Expect several weeks to a few months for routine correspondence cases; complex matters take longer.

If your case escalates to an exam or field audit, timelines expand and different procedures apply. Learn more about audit types in Understanding Field Audits vs Correspondence Audits.

How the IRS evaluates your response

The IRS reviewer looks for three things:

  1. Relevance — Documents must directly support the item questioned (dates, payers, amounts match).
  2. Authenticity — Records should be orderly and credible (bank statements, cross-references, third‑party records).
  3. Completeness — If the IRS asked for specific forms, provide them or explain why they don’t exist.

If you can’t find a document, provide a written narrative explaining why it is missing and what alternative documents you can supply.

Common mistakes and how to avoid them

  • Ignoring the notice: Never ignore. That leads to default assessments, added penalties, and interest.
  • Over-supplying: Don’t bury the examiner in unrelated files. Attach a brief index.
  • Missing identifiers: Failing to include the notice number or tax year slows processing—put them on every page.
  • Mailing without proof: Use tracked mail and keep proof of timely mailing.

If you miss the deadline

Contact the IRS immediately and explain the reason. Request an extension in writing; if you have reasonable cause (serious illness, natural disaster), the IRS may abate penalties, but interest on any unpaid tax generally continues to accrue. If the IRS assesses additional tax, you have appeal rights described in Publication 556.

When to consult a professional

  • You received a notice proposing a large tax increase.
  • You suspect the IRS has inaccurate third-party information (incorrect W‑2/1099).
  • The inquiry involves complex business or partnership issues.
  • You’re uncomfortable representing yourself or the case may lead to audit litigation.

If you choose representation, use Form 2848 to authorize the tax professional to speak with the IRS on your behalf.

Sample cover letter (use as a template)

[Date]
Internal Revenue Service
[Address from notice]
Re: Taxpayer Name: [Your name]
Taxpayer ID: xxx-xx-[last 4 digits]
Tax Year: [YYYY]
Notice Number: [from top of notice]

Dear Sir or Madam,
Enclosed please find documents responsive to the above-referenced notice. The packet includes the following items:

  1. [Document name] — [pages 1–3]
  2. [Document name] — [pages 4–6]

I believe these records address the items identified in your notice. If you require additional information, please contact me at [phone] or [email]. Thank you for your attention.

Sincerely,
[Your signature]

Include all documents behind the cover letter and a clean copy of the return, and staple or bind securely.

What happens after you respond

  • The IRS will record receipt and review. You may receive: no change, a proposed change (with opportunity to agree or appeal), or a request for more information. Keep monitoring and maintain your records for at least three years after filing (longer if fraud or substantial omission is suspected).

Consequences of nonresponse

Failure to respond can lead to:

  • Assessment of additional tax based on IRS information
  • Penalties for accuracy-related issues or failure to file/pay
  • Liens or levies in long-standing unresolved cases

Useful authoritative sources

For practical preparation for potential audits, see our How to Prepare for an IRS Audit: Documentation Checklist.

Professional disclaimer: This article is educational and does not substitute for personalized tax advice. For a case-specific plan, consult a licensed CPA, enrolled agent, or tax attorney.

Author note: In my practice, clients who respond within the stated deadline and provide a short, well-indexed packet usually see faster resolution and fewer proposed adjustments. Taking time early to organize records pays off in both stress reduction and financial outcomes.