IRS or Internal revenue Service has a list of codes, each signifying different things. The codes help in providing information in a standard way to all individuals without any ambiguity of wording and confusion in any case, along with maintaining a central reference list of all reference codes. The reference code 1221 is related to the filing of income tax returns and the amount of refund that is due to an individual. The 1221 code signifies that the refund has been delayed and is undergoing further review. It also asks the individual to conduct an account analysis within 7 cycles.