IRS Notice & Letter Help Center: Find Your Notice

Received an IRS notice or letter? Use this guide to identify common IRS notice numbers, understand why the letter matters, and decide what to review next. The notice number often appears in the upper-right portion of the letter. Always follow the instructions and deadlines on your actual notice.

Start with the official IRS lookup: Understanding Your IRS Notice or Letter. The IRS can explain the notice directly, and many issues can be handled without hiring a professional.

Unpaid Taxes and Payment Arrangements

• CP14 — Balance due: The IRS says you owe unpaid tax. Verify the tax year, balance, payments and due date.
• CP501 — Balance reminder: A reminder of an unpaid balance; review payment and payment-plan options.
• CP503 — Second reminder: An unpaid balance still requires attention; do not ignore the instructions.
• CP523 — Installment agreement default: The IRS proposes to terminate a payment arrangement. Review the stated reason and response or appeal deadline immediately.

Levies, Liens and Collection Rights

• CP504 — Notice of intent to levy: Collection action may follow. Review the precise levy warning and options stated in the notice. Official CP504 guidance.
• LT11 / Letter 1058 — Final notice of intent to levy and right to a hearing: Check the deadline for requesting a Collection Due Process hearing; deadlines affect important rights.
• CP90 — Final notice of intent to levy: Review collection hearing rights and response instructions immediately.
• CP508C — Passport-related certification: The IRS has certified qualifying seriously delinquent federal tax debt to the State Department. Review the certification, exceptions and reversal routes. Passport action is controlled by the State Department. IRS passport certification guidance.

Income Mismatches, Proposed Tax Changes and Audit Issues

• CP2000 — Income mismatch: Third-party information does not match the tax return. This is generally a proposed adjustment, not a bill; respond by the notice deadline. Official CP2000 guidance.
• CP3219A — Statutory notice of deficiency: Important Tax Court petition rights may be at stake. Confirm the precise deadline shown; do not assume that an IRS phone call extends it.

Unfiled Returns, Refund Delays and Refund Changes

• CP59 — Return not filed: The IRS has no record of a tax return it expects. Verify whether a return is required, was filed or needs preparation.
• CP05 — Return review: The IRS is reviewing items on the return. Follow requests and review refund status; avoid filing duplicate returns without a reason.
• CP12 — Return adjustment: The IRS changed information on the return, often affecting the refund or balance due. Compare the change with the filed return.
• CP49 — Refund offset: All or part of an overpayment was applied to an outstanding tax liability. Verify the account and tax period.

Identity Verification

• Letter 5071C — Identity/return verification: Follow the verification instructions in the genuine letter. Use official IRS channels and never send Social Security numbers or copies of notices through an unverified website or ordinary email.

What to Do When an IRS Letter Arrives

1. Verify it is genuine. Search its number using the official IRS notice directory.
2. Record deadlines. Some notices give appeal or court deadlines that must be met independently of any consultation.
3. Check the account details. Compare the tax year, payments and amounts to your records and IRS account.
4. Respond using the prescribed method. The IRS Document Upload Tool is an option only when appropriate for that notice; it is not a return-filing portal.
5. Seek help if needed. If the notice involves disputed assessments, unfiled returns, levies, passport certification or missed deadlines, consider professional review promptly.

Need Help Reviewing an IRS Notice?

Urban AZ Financial assists clients with tax preparation, tax-account and notice review, filing-compliance questions, and available IRS resolution pathways. Any IRS representation is subject to professional authorization and engagement scope. Call (623) 226-7948 or visit Urban AZ Financial to request assistance. Do not send confidential tax documents by unsecured email; request secure submission instructions.

Educational information only. IRS procedures, eligibility rules and thresholds can change. This page does not substitute for the instructions or deadlines on the taxpayer's specific notice, and Urban AZ Financial is not affiliated with the IRS.