A CP12 Notice is sent when the IRS corrects one or more mistakes on your tax return which either result in a different refund amount, or the amount owed. From your post, it appears that you are scheduled to receive a refund however if you owe back taxes, and the refund is less than what you owe you will not receive any refund, the IRS will take all your refunds to pay your tax bill until it's paid off.
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