Opening your mailbox and seeing an envelope from the IRS can make your stomach drop.

Before assuming the worst, remember that not every IRS notice means you are being audited, penalized, or sent to collections.

The IRS sends notices and letters for many different reasons. Sometimes the agency simply needs more information. It may have adjusted your refund, found a difference between your return and information reported by an employer or financial institution, or need to verify that you really filed the return.

Other IRS notices are more serious and may involve unpaid taxes, an audit, a proposed tax assessment, or possible collection action.

The important thing is to understand which IRS notice you received, what it means, and whether you have a deadline to respond.

The IRS says it may send a notice or letter because:

• You have a balance due
• Your refund changed
• The IRS has a question about your return
• The IRS needs to verify your identity
• The IRS changed or corrected your return
• Processing of your return has been delayed

Every notice addresses a particular issue and provides instructions about what, if anything, you need to do next.

If you receive an IRS notice, do not panic– but do not put it in a drawer and forget about it either.

How to Identify an IRS Notice or Letter

One of the first things to look for is the notice or letter number.

IRS notices commonly use a CP number, while other correspondence may use a Letter or LTR number.

Examples include:

• CP14
• CP2000
• CP3219A
• CP504
• Letter 566
• Letter 5747C

The identifying number generally appears on the right side of the correspondence, either toward the top or bottom depending on the format.

That number is useful because it tells you what type of notice you received and allows you to look up IRS instructions specifically related to it.

Also check:

• The tax year involved
• The taxpayer name
• The Social Security number or EIN information shown
• The amount involved
• The response deadline
• The reason the IRS says it contacted you
• Whether the IRS is requesting documents
• Whether the notice says you have appeal or Tax Court rights

Do not assume that two IRS letters are the same simply because both mention a balance or adjustment.

The notice number matters.

Common IRS Notices and What They Mean

Below are several IRS notices and letters taxpayers and businesses may encounter.

CP14 – Balance Due Notice

What Does a CP14 Mean?

A CP14 tells you that the IRS believes you have an unpaid federal tax balance.

It is one of the most common balance-due notices and is generally the first notice informing a taxpayer that tax remains unpaid.

The notice explains:

• How much the IRS says you owe
• Applicable penalties and interest
• When payment is due
• How to make a payment
• What to do if you disagree
• What payment options may be available if you cannot pay in full

The IRS currently describes the CP14 simply as a notice sent because you owe money on unpaid taxes.

Why Might You Receive a CP14?

You may receive one because:

• You filed a return showing a balance due and did not fully pay it
• A payment was missing or not properly credited
• The IRS made an adjustment that resulted in additional tax
• Penalties or interest remain unpaid

What Should You Do With a CP14?

First, compare the notice with your tax return and payment records.

If the balance is correct, pay it by the date shown on the notice if possible.

If you cannot pay the entire balance, do not ignore the letter. IRS payment options may include a payment plan or, depending on your circumstances, other tax-resolution alternatives.

If you believe you already paid the tax or the balance is incorrect, contact the IRS using the instructions on the notice and have proof of payment or other supporting records available.

CP2000 – Underreported Income or Information Mismatch

A CP2000 can look intimidating, but it is important to understand what it actually is.

What Does a CP2000 Mean?

The IRS receives information about taxpayers from third parties such as:

• Employers
• Banks
• Brokerage firms
• Retirement plans
• Businesses
• Other payers

The IRS compares that information with what was reported on your tax return.

If something does not match, the IRS may issue a CP2000 proposing a change.

For example, the IRS may have received a Form W-2 or 1099 that was not included on the return.

A CP2000 is not automatically a bill and is not itself an audit notice. It is a proposal to adjust information on your return. The proposed change can result in additional tax, a refund, or sometimes no tax change at all.

Why Might You Receive a CP2000?

Common situations include:

• A missing W-2
• A missing 1099
• Investment transactions that do not match the return
• Bank interest that was not reported
• Incorrect income amounts
• Payment or credit discrepancies
• Information reported under your Social Security number that you do not recognize

What Should You Do?

Read the proposed changes carefully.

If you agree, follow the response instructions included with the notice.

If you disagree, respond by the deadline and provide documentation explaining why the information on your original return is correct or why the proposed adjustment is inaccurate.

Do not automatically file an amended return simply because you received a CP2000. The IRS specifically instructs taxpayers to follow the notice procedures, and an amended return generally is not needed merely to agree with the CP2000 adjustment.

If the income shown on the notice is not yours, respond promptly. Unrecognized wages or other income can sometimes indicate identity theft.

CP3219A – Statutory Notice of Deficiency

A CP3219A deserves immediate attention because important legal rights and deadlines may be involved.

What Does a CP3219A Mean?

The CP3219A is a Notice of Deficiency.

It tells you that the IRS is proposing additional tax and gives you the right to challenge the proposed deficiency in the United States Tax Court before the tax is assessed.

You may receive a CP3219A after an unresolved CP2000 or another disagreement involving reported income and proposed adjustments.

The notice itself is not a bill or an audit notice. It communicates the proposed deficiency and explains your right to challenge the IRS determination.

The 90-Day Deadline Is Important

Taxpayers generally have 90 days from the date of the notice to file a petition with the U.S. Tax Court.

For certain notices addressed to taxpayers outside the United States, the period may be 150 days.

This deadline should not be taken lightly.

If you disagree with a CP3219A, consider contacting a qualified tax professional promptly so there is time to review the proposed changes and determine how you should respond.

Waiting until the deadline is only a few days away can severely limit your options.

CP504 – Notice of Intent to Levy

A CP504 is much more serious than an ordinary balance-due reminder.

What Does a CP504 Mean?

The IRS sends a CP504 when it still has not received payment of an unpaid tax balance.

It is a Notice of Intent to Levy.

Current IRS guidance warns that if the balance remains unresolved, the IRS may levy property or rights to property, including income, bank accounts, and a state income tax refund. The IRS may also file a Notice of Federal Tax Lien if one has not already been filed.

What Should You Do?

Act immediately.

Possible steps include:

• Paying the balance
• Setting up a payment arrangement
• Contacting the IRS if the amount is incorrect
• Reviewing tax-resolution options if you cannot pay
• Seeking professional representation if the collection matter has become complicated

Do not assume that the next IRS letter will simply be another friendly reminder.

Depending on the collection process, taxpayers may later receive notices such as CP90, Letter 11, or Letter 1058, which can provide formal notice of the IRS’s intent to levy and information about Collection Due Process hearing rights.

Those notices can carry a 30-day deadline for requesting a Collection Due Process hearing.

A CP504 is therefore a good point to stop postponing the problem and address the tax debt.

Letter 566 Series – IRS Audit or Examination Notice

This notice requires an important naming distinction.

Letter 566 and related Letter 566 variants may be used in an IRS examination.

However, CP566 is something completely different: CP566 concerns an Individual Taxpayer Identification Number, or ITIN, application that needs additional information.

So if you are researching an audit letter online, make sure you are looking at Letter 566, not CP566.

What Does a Letter 566 Mean?

A Letter 566-series initial contact letter generally tells you that your tax return has been selected for examination and identifies particular items the IRS wants you to document or explain.

The correspondence may request records supporting items reported– or not reported– on the return.

What Should You Do?

Carefully review:

• Which tax year is being examined
• Which items the IRS is questioning
• What documents are requested
• The deadline for responding
• Where the response must be sent

Gather only relevant and accurate supporting documentation.

Depending on the examination, this could include:

• Receipts
• Bank statements
• Business records
• Mileage logs
• Charitable contribution records
• Mortgage documents
• Dependent records
• Investment statements
• Other information supporting items on the return

If you are uncomfortable responding to an IRS examination yourself– or substantial tax is potentially at stake– professional representation may be especially helpful.

Letter 226-J – Employer Shared Responsibility Payment

Letter 226-J applies to businesses rather than ordinary individual taxpayers.

What Does Letter 226-J Mean?

The IRS sends Letter 226-J to an Applicable Large Employer, or ALE, when the IRS believes that employer may owe an Employer Shared Responsibility Payment, or ESRP, under the Affordable Care Act.

The proposed amount is based on information including Forms 1094-C and 1095-C filed by the employer and information from employees’ individual income tax returns.

Importantly, Letter 226-J is an initial proposal, not yet the final bill.

What Should a Business Do?

Review:

• Forms 1094-C and 1095-C
• The employee listing included with the letter
• The proposed ESRP calculation
• The response deadline
• Any corrections that may be needed

If you agree, follow the instructions provided.

If you disagree, the IRS allows the employer to provide an explanation and corrected information.

Because the amounts involved can be significant and the response involves employer health-coverage reporting, businesses receiving Letter 226-J may benefit from professional assistance.

CP12 – IRS Changed Your Refund

What Does a CP12 Mean?

A CP12 generally means the IRS corrected one or more mistakes on your return and, as a result, changed your expected refund or determined that you had an overpayment.

The correction may involve a math or clerical issue.

What Should You Do?

Compare the IRS explanation with the copy of the return you filed.

If you agree with the correction, you generally do not need to respond unless the notice specifically instructs you to take action.

If you disagree, the 60-day period is important.

Taxpayers who contact the IRS within 60 days of the CP12 may request that the IRS reverse the change. Waiting beyond that period can change the procedures available for challenging the adjustment and can affect prepayment appeal rights.

That is why even a notice involving a relatively small refund adjustment should be read promptly.

CP49 – Your Refund Was Applied to an Older Federal Tax Debt

What Does a CP49 Mean?

A CP49 means the IRS used all or part of your current federal tax refund to pay an unpaid federal tax debt.

For example, you may have expected a $3,000 refund but still owed $1,500 from a previous tax year.

The IRS may apply part of your refund toward that federal balance.

What Should You Do?

Review the notice to see:

• How much of your refund was applied
• Which tax debt received the payment
• Whether any balance remains
• Whether you agree with the IRS records

If you already have an installment agreement and a balance remains, continue making your scheduled payments unless the IRS tells you otherwise.

If the tax debt belongs to your spouse and you believe you are entitled to part of a joint refund, ask your tax professional whether Injured Spouse Allocation may apply.

There is also an important distinction between a CP49 and other federal refund offsets. The IRS handles offsets for prior federal tax debts, while certain other debts– such as qualifying child support, state obligations, or federal nontax debts– may be handled through the Treasury Offset Program rather than through CP49.

5071C / CP5071 Series – Identity and Tax Return Verification

Identity-verification notices are designed to protect taxpayers when the IRS receives a return that may be suspicious.

What Does a 5071C Mean?

The IRS received a federal tax return using your Social Security number or Individual Taxpayer Identification Number and needs to confirm:

1. That you are really you, and
2. Whether you actually filed the tax return

The current CP5071 series includes CP5071, Letter 5071C, and CP5071F.

What Should You Do?

Follow the instructions on your specific notice.

If online verification is offered, the IRS may direct you to its Identity and Tax Return Verification Service.

Have available:

• The IRS notice
• The return referenced in the notice
• A prior-year return, if available
• W-2s, 1099s, and other supporting documents

If you did not file the return, tell the IRS during the verification process because you may be dealing with tax-related identity theft.

Until verification is completed, the IRS may be unable to finish processing the return or issue the refund.

Letter 5747C – Identity Verification That May Require an IRS Office Visit

A 5747C also involves identity and tax-return verification, but the response procedure can be different.

The IRS sends this letter when it receives a return under your SSN or ITIN and needs additional verification before processing it.

If you filed the return, current IRS instructions for Letter 5747C may require you to schedule an appointment at a Taxpayer Assistance Center and verify your identity in person.

You may need to bring:

• Letter 5747C
• The return referenced in the letter
• Supporting W-2s and 1099s
• A prior-year return, if available
• Government-issued photo identification
• Additional acceptable identification documents

If you did not file the return referenced in the letter, call the Taxpayer Protection Program using the instructions contained in your 5747C.

Do not treat every identity-verification notice as interchangeable. Follow the instructions on the exact notice you received.

Is Every IRS Notice an Audit?

No.

This is one of the most important things taxpayers should understand.

A:

• CP14 is generally a balance-due notice.
• CP2000 proposes changes because information does not match.
• CP12 involves a correction to the return.
• CP49 explains that a refund was applied to federal tax debt.
• 5071C involves identity verification.

None of those notices automatically means the IRS is conducting a traditional examination of your tax return.

A Letter 566-series correspondence, on the other hand, can indicate that your return has been selected for examination.

Read the actual notice rather than assuming that “letter from the IRS” means “audit.”

How to Respond to Any IRS Notice

Although the specific response depends on the notice, several basic steps apply to almost any IRS correspondence.

1. Open the Letter and Read It Completely

This sounds obvious, but fear causes some taxpayers to avoid opening IRS mail.

That generally makes the situation worse.

The notice tells you:

• Why the IRS contacted you
• What tax year is involved
• Whether money is due
• Whether the IRS changed something
• Whether information is required
• Whether you have a response deadline

You cannot make a good decision until you know what the IRS is asking.

2. Verify the Notice Is Legitimate

Tax scams often attempt to create urgency by pretending to be the IRS.

Check the notice number and compare the information with your IRS tax records.

When in doubt, use IRS.gov or contact the IRS using independently verified contact information rather than relying on a suspicious email, text, link, or telephone number.

The IRS says it does not initiate contact through text messages or social media to request personal or financial information, and initial contact usually occurs by mail.

3. Check the Tax Year

Taxpayers sometimes assume a notice concerns the return they just filed when it actually relates to a previous tax year.

Look carefully at the year or tax period shown on the notice.

Then pull out the corresponding tax return and records.

4. Compare the IRS Notice With Your Tax Return

If the notice says the IRS changed your return, compare its figures with what was originally filed.

Look for:

• Missing income
• Incorrect credits
• Missing payments
• Calculation differences
• Duplicate income
• Misapplied payments
• Incorrect dependent information
• Other discrepancies

Understanding where the numbers differ makes it much easier to determine whether you agree.

5. Pay Attention to the Deadline

Not every deadline has the same consequences.

Some deadlines involve:

• Providing documents
• Requesting reversal of an adjustment
• Responding to proposed changes
• Preserving appeal rights
• Filing a Tax Court petition
• Requesting a Collection Due Process hearing

For example:

• CP12 can involve an important 60-day response period.
• CP3219A generally carries a 90-day Tax Court petition deadline.
• Certain final levy notices can provide 30 days to request a Collection Due Process hearing.

Missing one of these deadlines can change or limit your available options.

6. If You Agree, Follow the Instructions

Sometimes an IRS notice is correct.

If you agree, you may simply need to:

• Pay the balance
• Sign and return a response form
• Provide requested information
• Update your records
• Take no action at all

Do not send unnecessary correspondence if the IRS specifically says a response is not required.

7. If You Disagree, Explain Why and Provide Documentation

Do not simply write, “The IRS is wrong.”

Explain the specific issue and provide supporting records.

Depending on the notice, useful documentation might include:

• W-2s or 1099s
• Canceled checks
• Payment confirmations
• Brokerage statements
• Receipts
• Bank statements
• Custody records
• Amended forms
• Business records
• Other tax documents

The IRS advises taxpayers who disagree with a notice to follow the dispute instructions and include copies– not originals– of relevant documents.

8. Keep Copies of Everything

Maintain a file containing:

• The original IRS notice
• Your response
• Documents you submitted
• Fax confirmations
• Certified-mail records, if applicable
• Online upload confirmations
• Notes from telephone conversations
• Payment confirmations
• Follow-up IRS correspondence

IRS matters can involve several rounds of correspondence, and good records make it much easier to understand what has already happened.

What Happens If You Ignore an IRS Notice?

The consequences depend entirely on the notice.

Ignoring a simple request for information may delay your refund.

Ignoring a CP2000 may cause the IRS to continue the proposed-adjustment process and eventually issue a Notice of Deficiency.

Ignoring a balance-due notice may allow penalties and interest to continue accumulating.

Ignoring collection notices can eventually lead to enforcement action.

Ignoring a Notice of Deficiency may cause you to lose the opportunity to challenge the proposed tax in Tax Court before assessment.

So while ignoring an IRS letter does not automatically produce a penalty or levy in every situation, failing to respond can make some tax problems considerably more difficult to resolve.

The IRS advises taxpayers to act by the due date when a response is requested, both to minimize possible interest and penalties and to protect appeal rights.

Can a Tax Professional Respond to an IRS Notice for Me?

Depending on the type of notice and the professional’s credentials and authorization, a qualified tax professional may be able to communicate with the IRS on your behalf.

The IRS commonly uses Form 2848, Power of Attorney and Declaration of Representative, when an eligible representative is authorized to represent a taxpayer before the agency.

Professional assistance can be especially valuable when:

• You do not understand why the IRS changed your return
• The proposed tax is substantial
• Several tax years are involved
• You have received conflicting notices
• Your business records are being examined
• Collection action is possible
• You disagree with a CP2000
• You receive a Notice of Deficiency
• You are facing an audit
• You have an existing tax debt
• You have already tried unsuccessfully to resolve the problem yourself

Keep in mind that some actions– particularly certain identity-verification procedures– may still require the taxpayer’s personal participation even when a representative is involved.

When Should You Seek Professional Help With an IRS Notice?

Not every IRS letter requires professional representation.

If the IRS corrected an obvious math error and you agree with the result, you may simply need to keep the notice with your records.

However, consider contacting a tax professional promptly if you receive:

• CP2000 with significant proposed tax changes
• CP3219A or another Notice of Deficiency
• CP504 or another serious collection notice
• CP90, LT11, or another final levy notice
• Letter 566 or another audit/examination letter
• Letter 226-J involving an Employer Shared Responsibility Payment
• Identity-verification correspondence you cannot resolve
• Multiple IRS notices for the same tax year
• A notice involving a year you never filed
• Correspondence involving substantial penalties or interest
• Any IRS notice you simply do not understand

The earlier the notice is reviewed, the more time you generally have to evaluate your options.

Get Help Responding to an IRS Notice Before the Deadline Passes

An IRS notice does not automatically mean you are in serious trouble.

But the type of notice matters.

A CP12 may simply explain a change to your refund. A CP2000 may propose adjustments based on information the IRS received from a third party. A 5071C may be protecting you from identity theft.

A CP3219A, audit letter, or levy-related notice deserves a different level of urgency.

The key is to identify the notice, understand what the IRS is asking, and respond within the applicable deadline.

At Matterhorn Tax Planning, we can help you review IRS correspondence, understand what the notice means, determine whether the IRS information is correct, organize supporting documents, and identify the appropriate next step.

If you receive an IRS notice and are unsure what to do, contact Matterhorn Tax Planning before ignoring it or responding without understanding the consequences.

A timely, accurate response can often keep a manageable tax issue from becoming a much larger one.