IRS NOTICE REFERENCE
Understanding your letter 4087C
We need more information to process your international income tax return. Information needed could be: Missing or corrected forms or schedules to support your entries on Form 1040 , U.S. Individual Income Tax Return, For…
General information only. Not legal or tax advice.
Notice details
- Notice code
- Letter 4087C
- Category
- Examination and audit
- Severity tier
- Tier 2 — Action or response expected. The IRS has taken or proposed an action and expects a response or payment.
- Governing law
- §7602 (Internal Revenue Code section)
- Statutory response window
- 30-day window — always confirm the exact deadline against the date printed on your notice.
- Source
- IRS.gov — Understanding Your IRS Notice
What this notice is
We need more information to process your international income tax return. Information needed could be: Missing or corrected forms or schedules to support your entries on Form 1040 , U.S. Individual Income Tax Return, Form 1040-NR , Nonresident Alien Income Tax Return, or Form 1040-SR , U.S. Income Tax Return for Seniors. Missing or corrected forms or schedules to support your entries on Form 1040 , U.S. Individual Income Tax Return, Form 1040-NR , Nonresident Alien Income Tax Return, or Form 1040-SR , U.S. Income Tax Return for Seniors. Verification of income, withholding, and credit amounts. Verification of taxpayer identification numbers or Social Security numbers. We’ll send any refund due about 6-8 weeks after we receive your response.
Source: IRS.gov. Reproduced for reference. General information — not legal or tax advice.
What the IRS says to do
Read your letter carefully. Send the information we requested within 30 days. Respond to the letter, even if you disagree, providing a clear explanation of what you disagree with. Do not file a Form 1040-X, Amended U.S. Individual Income Tax Return.
This is the IRS’s own guidance reproduced from the IRS notice page. It describes the IRS’s process — it is not legal or tax advice from TaxRiskOS.
Governing IRS procedure (Internal Revenue Manual)
The IRS’s own internal procedures for handling this notice type are documented in the Internal Revenue Manual:
- IRM 4.10.1 — 4.10.1 Overview of Examiner Responsibilities
- IRM 4.10.3 — 4.10.3 Examination Techniques
- IRM 4.13.1 — 4.13.1 Examination Audit Reconsideration Process
Reference to published IRS procedure. General information — not legal or tax advice.
Official IRS reference
Read the official notice page on IRS.gov: https://www.irs.gov/individuals/understanding-your-letter-4087c
Related tools
TaxRiskOS is workflow software for practitioners — it captures the notice, computes the deadline, surfaces the escalation tier, and builds a document checklist. It documents process; it does not give advice or draft responses.
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