This has come up a lot this year, and in most cases it does not mean something was done wrong and it does not mean you’re being audited. Tax agencies often assess penalties after a return is filed, sometimes many months later. These letters are typically generated automatically and usually relate to payment timing, not how the return was prepared. The most common reasons include: Tax was paid after the original deadline - Even if your return was filed on time (or an extension was filed), the IRS and states still require any tax owed to be paid by the original due date. Filing an extension only extends the time to file—not the time to pay. Not enough tax was paid during the year - The tax system is “pay‑as‑you‑go.” If enough tax wasn’t paid throughout the year through withholding or estimated payments, a penalty can apply—even if the balance due was paid when the return was filed. Late or corrected payments - Payments made after filing, partial payments, or corrections processed later can trigger penalty letters once the agency finishes matching records. Processing delays - Many letters being sent now relate to prior‑year returns that were processed slowly. The timing of the letter does not necessarily reflect when the issue occurred. These notices explain what the penalty is for, how it was calculated, and what options are available. In many situations, penalties may be reduced, waived, or resolved once the notice is reviewed and addressed properly. If you receive one of these letters, don’t panic—but don’t ignore it either. The key is understanding exactly what the notice says and responding appropriately.

In most cases, this is a routine security step, not an audit and not a penalty. The IRS sends identity‑verification letters when its systems detect something on a tax return that doesn’t match prior records or appears unusual. The goal is to protect you from identity theft and refund fraud before the IRS finishes processing the return or issues a refund. This can happen even when everything on the return is correct. Common triggers include: A change in address, bank account, or filing pattern A refund amount that is significantly different from prior years A return filed earlier or later than usual First‑time filings or newly added dependents Mismatches between IRS records and information reported by employers or payers Receiving this letter does not mean you did anything wrong. In fact, many legitimate returns are flagged simply because the IRS uses very conservative filters to prevent fraud. The letter will explain exactly how to verify your identity, usually by: Verifying online through the IRS identity‑verification site Calling the phone number printed on the letter In some cases, visiting an IRS office for in‑person verification It’s important to follow only the instructions on the letter itself. The IRS will never ask you to verify your identity by email, text message, or social media. Until verification is completed, the IRS will place the return on hold. Once verified, processing usually resumes and the issue is resolved without further action. If you receive one of these letters, don’t panic—but don’t ignore it. Promptly completing the verification is the fastest way to move things forward.

It’s very common for the IRS to send letters after a return has already been filed and even processed. The IRS often reviews returns in stages, and many notices are generated automatically once information from employers, banks, or other payers is matched against the return. Letters may also be sent due to processing delays, payment timing issues, or simple corrections the IRS made internally. In most cases, these letters are informational or follow‑up notices, not a sign of an audit or serious problem.

No. Most IRS letters are not audits. A letter or notice usually addresses a specific issue, such as a balance due, a correction, missing information, or identity verification. An audit is a more formal review and is far less common. If a return is selected for audit, the IRS will clearly state that in writing and explain what documentation is needed. Simply receiving an IRS letter does not mean you are being audited.

Penalties are often assessed after a return is filed, not at the time of filing. Common reasons include paying the tax balance after the original deadline, underpaying taxes during the year through withholding or estimated payments, or interest continuing to accrue on a balance. Due to processing backlogs, it is very normal for penalty notices related to a prior year to arrive months later. The notice explains the reason for the penalty and what options are available.

No. Identity‑verification letters are a fraud‑prevention measure, not an accusation. The IRS sends these letters when something on a return looks unusual or doesn’t match past records. This can happen because of an address change, a new bank account, changes in income, or simply stronger security screening. Until identity verification is completed, the IRS pauses processing to protect your account. Once verification is done, processing usually resumes without further issues.

No. IRS and state tax letters should never be ignored, even if you believe everything was filed correctly. Some letters only require review, while others have response deadlines. Ignoring a notice can lead to additional penalties, interest, or collection activity. Each letter includes a code or reference number and instructions explaining whether action is required. Reading the letter carefully and responding appropriately is the best way to prevent issues from escalating.

🔹 Income & Return Mismatch Notices These are among the most frequently issued IRS letters. CP2000 – Proposed changes for underreported income / The IRS believes income (W‑2, 1099, etc.) was not fully reported. This is not an audit, but it does require a response. CP3219A / CP3219N – Notice of Deficiency / A formal notice proposing additional tax. This letter includes Tax Court rights and deadlines. 🔹 Return Adjustment & Math Error Notices Issued when the IRS auto‑corrects something on a return. CP11 – Return corrected and you owe tax CP12 – Return corrected and refund changed CP13 – Return corrected, no refund and no balance due CP16 – Refund applied to another tax balance These notices often don’t require action unless you disagree. 🔹 Balance Due & Payment Notices The most common IRS letters overall. CP14 – Initial balance due notice CP501 – First reminder follow‑up CP503 – Second reminder (more urgent) CP504 – Final notice before levy on state refund CP161 – Notice of unpaid balance CP521 – Monthly installment agreement reminder CP523 – Installment agreement default warning Ignoring these can lead to enforced collection. 🔹 Refund‑Related Notices Sent when refunds are delayed, offset, or replaced. CP49 – Refund applied to past‑due taxes or other debts CP32 – Refund returned due to outdated address CP45 – Refund applied to estimated taxes CP24 – Refund adjusted due to credit changes 🔹 Identity Verification & Security Notices Extremely common in recent tax years. Letter 5071C / CP5071 – Identity verification required Letter 4883C – Identity verification (phone‑only) Letter 5747C – In‑person identity verification required These letters pause processing until verification is complete. 🔹 Missing Return Notices Issued when the IRS believes a return was required but not filed. CP59 – First request for missing return CP515 / CP516 – Reminder to file missing return CP518 – Final notice to file Failure to respond can result in a Substitute for Return (SFR). 🔹 Collection & Enforcement Notices These represent serious escalation. LT11 / Letter 1058 – Final Notice of Intent to Levy / Includes the right to a Collection Due Process (CDP) hearing CP90 / CP297 – Final levy notice (assets at risk) CP91 / CP298 – Social Security levy notice CP504 – Notice before levy on state tax refund These should never be ignored. 🔹 Earned Income Credit (EIC) & Credit Notices Often sent to families with dependents. CP09 – You may qualify for EITC CP75 / CP75A – Refund delayed pending verification CP79 / CP79A – EITC eligibility issues or restrictions

Common IRS Letters and Their Kansas & Missouri State Equivalents Balance Due / You Owe Tax IRS CP14 – Initial balance due Kansas: Tax Due Notice (KDOR balance due letter) Missouri: Notice of Balance Due IRS CP501 / CP503 – Reminder notices Kansas: Delinquent Tax Reminder Notice Missouri: Balance Due / Delinquency Notice IRS CP504 – Final notice before levy (state refund) Kansas: Intent to Enforce Collection / Tax Warrant Notice Missouri: 10‑Day Demand / Notice of Intent to Offset IRS LT11 / Letter 1058 – Final Intent to Levy Kansas: Tax Warrant filed with county court Missouri: Tax Lien Notice / Collection Referral Notice Return Corrections & Adjustments IRS CP11 – Return corrected, tax now owed Kansas: Filing Error or Adjustment Notice Missouri: Notice of Adjustment / Proposed Assessment IRS CP12 – Refund amount changed Kansas: Refund Adjustment Notice Missouri: Notice of Adjustment IRS CP13 – Correction, no balance due Kansas: Correction Notice Missouri: Notice of Adjustment (no balance) Underreported Income / Proposed Changes IRS CP2000 – Underreported income (W‑2 / 1099 mismatch) Kansas: Proposed Assessment / Audit Inquiry Missouri: Notice of Deficiency or Proposed Assessment IRS CP3219N – Statutory Notice of Deficiency Kansas: Formal Assessment Notice Missouri: Notice of Deficiency with appeal rights Refund Offset Notices IRS CP49 – Refund applied to past‑due debt Kansas: Refund Offset Notice Missouri: Notice of Intent to Offset / Debt Offset Notice Identity Verification / Fraud Review IRS 5071C / 4883C / 5747C – Identity verification required Kansas: Verification Request / Fraud Review Letter Missouri: Signature Request / Identity Verification Notice Missing Return Notices IRS CP59 / CP515 / CP518 – Missing tax return request Kansas: Request for Return Filing Missouri: Request for Tax Return / Notice of Delinquency Collections & Enforcement Escalation IRS Levies / Garnishments Kansas: Tax Warrant → Bank levy or wage garnishment Missouri: Lien, garnishment, asset seizure, collection agency referral Quick Client Notes You Can Add State letters do not use CP numbers, but the issues match IRS notices Kansas uses tax warrants earlier and more aggressively Missouri relies more on written demand stages before enforcement State notices often appear after IRS letters due to data sharing Ignoring state letters can block refunds, licenses, or trigger liens