1121 meens that your tax return is being reviewed and/or being audited on the first level . The IRS is reviewing your tax return info for accuracy. Once they complete their review, they will either release any refund that you have coming or you will be notified that they are taking the audit to the next level based on their initial findings. Usually these are just returns picked at random for review, and only a small percentage ever end up going any further than the initial review for accuracy.
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