Key insights
- Most IRS notices are narrower than they first appear. They usually focus on one tax year, one issue, or one mismatch, which means a careful review can help separate what the IRS is actually asking from the stress the notice may create.
- The way you respond matters as much as the substance of the response. Clear documentation, organized support, and a response directly mapping to the IRS request can reduce follow-up questions and help move the matter toward resolution.
- Deadlines can shape your options. Responding early helps preserve appeal rights, hearing opportunities, and other paths to resolution before the notice escalates into a more limited or formal process.
Receive an IRS notice? Get experienced guidance to help resolve it.
Receiving a letter from the IRS can derail an otherwise ordinary day. The envelope arrives, the language feels formal, and the next step may not be obvious. The consequences of a wrong move — or no move — can be significant.
Explore common IRS notices you may receive, what each one typically means, and how to respond in a way preserving your options and increasing the likelihood of timely resolution.
Common IRS notices and what they mean
The IRS primarily communicates through the U.S. Postal Service. Each notice serves a specific purpose and usually centers on one issue instead of a broad review of your tax return.
Return Adjustment Notices (CP210 and CP220)
These notices indicate the IRS has already made changes to a previously filed tax return, typically due to discrepancies, math corrections, or missing information. If you don’t agree with the adjustment, respond with clear documentation supporting your position.
Automated Underreporter Notice (CP2000): Proposed adjustment
A CP2000 identifies a mismatch between the tax return and third-party information, such as a W-2 or 1099. It’s not an audit or a bill. It’s a proposal inviting you to agree, agree in part, or dispute the proposed change with supporting documentation.
Notice of tax due and demand for payment (CP14): First balance-due notice
A CP14 is typically the first formal notice the IRS sends after processing a tax return showing unpaid tax, penalties, and interest. It requests payment by a stated due date and signals the IRS has assessed the tax and the account has entered collections.
If you don’t think you owe the balance due, your tax advisor can request detailed breakdown from the IRS and dispute any inappropriate assessments. If you agree you owe the balance due but are unable to pay, you can request a short-term extension or a payment plan based on your ability to pay. Interest and late payment penalties continue to accrue, but proactive communication with the IRS avoids unnecessary escalation.
Balance-due reminders and escalation (CP501, CP503, CP504, and LT11/CP297/Letter 1058)
If you don’t respond to the first demand for payment, the IRS follows with reminders and escalations:
- CP501 is a balance-due reminder
- CP503 is a second reminder
- CP504 is an inflection point because the tone shifts from requesting payment to warning that the IRS may levy your state tax refund, wages, or bank accounts
- LT11, CP297, or Letter 1058 are final legal notices before the IRS begins seizing wages and assets
Your tax professional can advise you of the options available at each step.
Statutory Notice of Deficiency (Letter 3219)
Often called the 90-day letter, Letter 3219 is a statutory notice informing you the IRS has determined a tax deficiency. It gives you 90 days to challenge the deficiency in U.S. Tax Court before the IRS assesses the additional tax and begins collections. At this stage, you likely need an attorney to file a tax court petition for you.
Identity Verification Letter (Letter 5071C)
Letter 5071C (and related notices, such as CP5071) pauses tax return processing until you verify your identity and the tax return. This step is designed to prevent tax refund fraud. In most cases, verification must be completed by the taxpayer using the process described in the letter.
Claim disallowance notices (Letters 105C and 106C)
Letter 105C is the IRS's formal notice it has fully denied a claim for refund or credit, such as a claim filed on an amended tax return. Letter 106C is similar, but reflects a partial disallowance, meaning the IRS allowed some but not all the claimed amount. These letters have become increasingly common as the IRS processes and reviews employee retention credit (ERC) claims.
The date on the letter starts a two-year window to resolve the claim with the IRS or file suit in federal court. This deadline is firm. The clock continues to run even if you request an appeal or IRS reconsideration.
If you disagree with the disallowance, possible options include responding with supporting documentation, requesting review by the IRS Independent Office of Appeals, or filing suit in U.S. District Court or the U.S. Court of Federal Claims, depending on the facts. Work with a tax professional to evaluate your options, prepare a response, and monitor the two-year deadline to preserve your rights.
How to approach IRS notices
A productive IRS notice response starts with a disciplined, step-by-step approach.
- Verify the notice — Confirm the notice type, the tax year, and the account details. This step also helps separate legitimate IRS mail from look-alike solicitations.
- Define the scope — Many notices focus on one item, one tax year, or one data mismatch. Compare the notice to the filed tax return to see what triggered the letter. You can also contact the IRS for additional information.
- Build a targeted response — When the IRS requests a reply, assemble documentation aligned to each question in the notice. Label exhibits clearly and include a concise cover letter mapping each attachment to the IRS request.
- Retain proof of timely response — Anytime you send documents to the IRS, retain proof of timely filing, such as a certified mail receipt or fax confirmation.
Clear, professional responses reduce follow-up questions and help move the matter toward resolution.
Common missteps in responding to IRS notices
A few common “gut” reactions can make a notice harder to resolve:
- Paying immediately without reviewing the notice and the underlying return details
- Missing response deadlines, which can narrow appeal or hearing options
- Mailing original documents instead of copies
- Sending disorganized records, making it easy for the IRS to reject your response
- Waiting until the final days to gather records
Keep options open by responding early, staying organized, and matching documentation to the IRS request.
How CLA can help respond to IRS notices
IRS notices come from standardized systems providing limited context. A thoughtful review and a clear response plan often keep the issue contained and lead to resolution.
At CLA, we pair technical tax knowledge with a repeatable process and close coordination with our IRS controversy professionals in our national tax office. We work with taxpayers to interpret what the IRS is asking, assemble support, and move the matter forward.
If an IRS notice raises questions about meaning, timing, or the right response, we can help you turn the letter into a clear plan and next step.