How the System Calculates Amortization After an Amortization Rule Change

Owned by Nancy Cohn (Deactivated)
Last updated: Nov 22, 2023
2 min read

You can initiate retrospective amortization processing by an amortization rule change. Whenever the system finds an amortization rule in normal Earnings processing, the system stores the amortization rule Instance on the lot in tag 4256. Each time the system runs the Earnings process, the system checks the amortization rule Instance on the lot level (tag 4256) to see if the Instance changed. If the amortization rule Instance changed and the change to the amortization rule could affect the yield result, the Earnings process initiates a retrospective amortization calculation. It sets up the retrospective amortization calculation based on two additional tags:

  • Amortization Rule Change Application tag (tag 9007) value on the amortization rule.

  • Last earnings retro type (tag 10467) on the lot. Tag 10467 has a value of C (Conversion Date/Settlement Date retrospective amortization calculation) or Null, unless an original retro has been run in the meantime. If an Original retro has been run, the tag's value is O.

If Amortization Rule Application (tag 9007) is set to Retrospective, the retro is kicked off with type O (Original Acquisition date) or C (Conversion Date/Settlement Date), based on Retro Start Date.

If the Amortization Rule Application is set to Prospective, a D type retro (Date Specific) is initiated. The earn through date and prior day's LTD amortization numbers are put on the object in the Retro Start Date and the two prior LTD Amortizations (tags 9615 and 9616). In this way, the amortization should pick up prospectively from the Earn Through Date, rather than from the Period Begin Date.

Also, whenever a Run Retrospective Amortization process is run, Eagle Accounting continuously handles amortization retrospectively until the end of the coupon period, so the PTD and LTD amounts are handled properly. After retrospective amortization has run, the rules take the Retrospective Amortization Type (tag 9159) off of the event and put it on the object, along with the Retro Process Date in tag 9614. On subsequent days, the earnings process checks for tag 9614 on the lot, and if it is in the current coupon period, the earnings process activates retro again.

If there is an amortization rule change that only affects some of the lots in a position (because the rule is a lot level override rule), only those lots initiate retro calculations. Earnings accomplishes this by setting the Retrospective Amortization Type to Y for the event on the initial retro calc, so that the rule processes it appropriately, and then sets it back to N before the next lot processes.

For more information about the specific conditions where changes to an amortization rule can affect the yield result, see Understand Yield Recalculation after an Amortization Rule Change.