IRS Steps to Manually Compute Interest

20.2.6.6  (06-24-2008)
Steps to Manually Compute Interest

  1. To compute interest to a specific date after a tax underpayment and penalties have posted:

    If Then
    The account is not restricted from computing interest Use CC INTST or CC FTPIN
    The account is restricted from computing interest, or module conditions exist that prevent systemic calculations Manually Compute

  2. Use the following process to determine the net amount of interest to be assessed or abated. This process allows for consideration of any interest free-periods and allows comparison of the adjusted amount to interest already assessed. Use either CC COMPA or the ACT/DMI program.

    1. Using a current TXMOD or Master File transcript, compute a running module balance on the entire tax module.

    2. Enter debits and credits on the appropriate dates.

    3. Suspend and resume interest (on a specific amount if necessary) for waiver/suspension periods.

    4. Compare the amount of interest assessed on the module to your interest computation to determine the interest assessment (TC 340) or abatement (TC 341). Compare the module balance plus/minus your adjustment with the balance of interest and principal on your computation. If the balances are not the same, go through your computation to determine if there is an error in your entries.

      Note:

      Always balance your computation with the tax module balance plus/minus your adjustment.


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