IRS Notice Response Checklist: What to Do in the First 48 Hours
An IRS letter in your mailbox calls for reading and record-gathering, not panic. This checklist walks the first two days step by step so you respond from facts, not fear.
The first 48 hours after an IRS letter arrives are for reading carefully and gathering facts, not for panicking. Most notices are routine. They name a specific tax year, a specific issue, and a specific deadline, and they tell you exactly what the IRS wants. Your job in these two days is simple: understand what the notice actually says, save everything that came with it, and pull the records that match. You respond from facts, on time, in writing. That calm, methodical approach handles the large majority of notices without drama.
Hour One: Read the Notice, the Whole Notice
Slow down and read it like a document, not a threat. Every IRS notice has the same anchors, and you want all of them written down:
- The notice or letter number (usually top or bottom right, like CP2000 or LT11)
- The tax year it concerns
- The specific issue the IRS is raising
- The deadline to respond
- What the notice is asking you to do
A notice asking you to confirm a figure is a very different animal from one proposing a change or requesting payment. The number and the language tell you which one you have. Do not guess at the meaning. Read what it says it is.
Keep Everything
Save the envelope. Save every page and every attachment. Do not toss the outer envelope, because the postmark and address can matter later. Keep the notice in one place with anything you mail back. From this point forward, you are building a small, clean file for one issue.
The First 48 Hours Checklist
This is the centerpiece. Work through it in order.
- Write down the notice number, tax year, issue, and deadline. One index card or one note. This is your map.
- Keep the envelope and all attachments together. Nothing gets recycled until the matter is closed.
- Pull the exact return the notice references. The right year, the version you actually filed, not a draft.
- Read the notice line by line against that return. Find each item the IRS mentions on your return, or confirm it is genuinely missing.
- Gather the source documents. W-2s, 1099s, 1099-Bs, receipts, mileage logs, invoices, bank statements that relate to the issue.
- Do not send original records unless the notice specifically tells you to. Send clear copies. Keep your originals.
- Build one clean timeline of facts and documents. What happened, when, and which document proves it. One page if you can.
- Note the response method and deadline. Mail, fax, or online, and the exact date. Plan to respond with room to spare.
- Decide whether to respond alone or bring in help before you write anything you sign.
Run the Tax Return Documentation Checkup to review your own records before you file.
Compare the Notice to the Return You Actually Filed
This step trips people up because they compare the notice to what they remember, not to what they filed. Pull the actual return. Match each item the IRS raises to a line on that return and to the document behind it. Often the income or deduction is right there, just on a different line than the matching system expected, and the whole thing resolves with a short explanation and a copy of one form.
Gather Records Before You Contact Anyone
Resist the urge to call the IRS the moment the letter lands. Gather first. A five-minute call where you cannot answer the question gets you nowhere. Once your documents are in front of you and your timeline is written, any call or written response is short and useful, because you are working from facts instead of memory.
When Not to Go It Alone
Handle a simple, clearly correct notice yourself. Loop in a CPA, an enrolled agent, or a tax attorney when the amount is significant, when several years are involved, when the notice concerns a position you are not sure about, or when the letter is a formal examination notice rather than a routine matching letter. Getting advice early is cheaper than fixing a rushed response later. If you want someone to act on your behalf with the IRS, a professional can do that too.
A Quick Example of the Calm Approach
A freelancer gets a notice in June saying $4,000 of 1099 income appears unreported for the prior year. Instead of panicking, she writes down the notice number, year, issue, and deadline. She pulls her filed return and finds the $4,000 already reported on her Schedule C under a slightly different client name. She mails a one-page reply with a copy of the 1099 and the matching Schedule C line, well before the deadline, and keeps her originals. Total time: under an hour. That is what the first 48 hours are for.
Before next filing season, run a documentation checkup so the records are already in order if a notice ever shows up.
Run the Tax Return Documentation Checkup to review your own records before you file.
Related guides
- CP2000 Notice vs. IRS Audit: How to Tell What the IRS Wants
- IRS Audit by Mail vs. In Person
- Verify an IRS Notice and Avoid Tax Scams
Frequently Asked Questions
Should I call the IRS as soon as I get a notice?
Gather your records first. Read the notice, pull the filed return, and assemble the source documents before you call or write. A response built on facts is faster and far more useful than a rushed call.
Should I send my original documents to the IRS?
No, not unless the notice specifically instructs you to. Send clear copies and keep your originals. You may need those originals again before the matter is fully resolved.
How fast do I have to respond?
By the deadline printed on the notice, and ideally with a few days of cushion. Responding on time, in the method the notice specifies, keeps your options open and prevents a proposed change from being assessed by default.
Sources
Last reviewed: June 21, 2026.
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