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Navigating IRS LTR 12C

  • Howard Richardson
  • Oct 30
  • 3 min read

Updated: Nov 1

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Receiving a letter from the Internal Revenue Service (IRS) can be an unsettling experience. However, if you’ve received IRS Letter 12C, there’s no need to panic. This letter is not an audit notice or a demand for payment. Instead, it’s a routine request for additional information to help the IRS process your individual income tax return. This guide will walk you through what Letter 12C is, why you might have received it, and how to respond, all based on authoritative sources from the IRS and federal tax law. 


Understanding the Purpose of Letter 12C 



Letter 12C, officially titled “Individual Return Incomplete for Processing,” is a notice sent by the IRS when your tax return is missing required information or contains inconsistencies. The IRS’ primary goal is to ensure the accuracy of your return before it’s fully processed. As the IRS website states, the letter is sent to request “missing forms or schedules to support your entries on Form 1040 or Form 1040-SR,” verify “income, withholding, and credit amounts,” or obtain “documentation to reconcile advance payments of the Premium Tax Credit (PTC).” 

This process is rooted in the legal framework of the U.S. tax system. Internal Revenue Code (IRC) Section 6011 establishes the general requirement that taxpayers must file returns with all the information required by the forms and regulations. 


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Treasury Regulation § 1.6011-1 further clarifies that returns must be carefully prepared with all required information to be considered complete. Letter 12C is the administrative tool the IRS uses to ensure these requirements are met. 


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Common Reasons for Receiving Letter 12C 


While there are several reasons you might receive a Letter 12C, one of the most frequent is related to the Premium Tax Credit (PTC). The PTC is a refundable tax credit designed to help eligible individuals and families afford health insurance purchased through the Health Insurance Marketplace. Here’s a breakdown of why the PTC often triggers a Letter 12C: 

  • Missing Form 8962, Premium Tax Credit (PTC): If you received advance payments of the PTC, you are required by law to file Form 8962 with your tax return to reconcile the amount of the credit you received with the amount you were actually eligible for. This requirement is outlined in IRC Section 36B and further detailed in Treasury Regulation § 1.36B-4

  • Missing Form 1095-A, Health Insurance Marketplace Statement: To complete Form 8962, you need the information from Form 1095-A, which is provided by the Health Insurance Marketplace. If you don’t include Form 8962 with your return, the IRS will send Letter 12C to request it. 


Other common reasons for receiving a Letter 12C include missing schedules for other credits or deductions, or discrepancies between the income and withholding you reported and the information the IRS has on file from employers and other third-party payers. 



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How to Respond to Letter 12C 


Responding to Letter 12C is a straightforward process. Here’s what you need to do: 

  1. Read the Letter Carefully: The letter will specify exactly what information is needed and provide a deadline for your response, which is typically 20 days from the date of the letter. 

  2. Gather the Required Documents: Collect all the documents the IRS has requested. For PTC-related issues, this will be a completed Form 8962 and a copy of your Form 1095-A. 

  3. Respond by the Deadline: It is crucial to respond by the deadline. The Taxpayer Advocate Service warns that if the IRS doesn’t receive a response, they may adjust your return, which could increase your tax liability or reduce your refund. 

  4. Submit Your Response: The letter will provide instructions on how to submit your information, which is typically by mail or fax. Be sure to include a copy of the Letter 12C with your response. 

Crucially, do not file an amended return (Form 1040-X) unless specifically instructed to do so by the IRS. The information you provide will be used to process your original return. 


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What to Expect After You Respond 


After you’ve sent your response, the IRS will review the information and continue processing your return. If you are due a refund, you can typically expect to receive it within 6-8 weeks after the IRS receives your response. If you don’t hear back within that timeframe, it’s advisable to follow up with the IRS to confirm they have received your documentation. 


Conclusion 


While any communication from the IRS can be intimidating, Letter 12C is a manageable request for information. By understanding its purpose, gathering the necessary documents, and responding in a timely manner, you can ensure your tax return is processed accurately and efficiently. Remember, this is a routine part of the tax administration process, designed to ensure the fairness and accuracy of the system for all taxpayers. 


Learn how to fix your issues with the IRS and put it behind you.

Watch the free video, The Ultimate Guide to Solving Your IRS Tax Problems:





 

 
 
 

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howard@hrichtax.com

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