Typically when a taxpayer sends data in to respond to a request, the IRS will send a letter back stating that the information was received and they are reviewing it.
If after reviewing your response nothing changes from your original return, you will only know it is resolved when the refund is deposited.
If the review results in changes to your refund/tax return you will likely get a letter explaining those changes and giving you an opportunity to agree or disagree and send in additional information.
Your 12C letter should also have contact information you can use to call the IRS office handling the situation to get an update.
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