The admin at badger power can set up an eligibility criteria for this rebate type with activity Date >= Jan1 and <= Jan31. This option allows the admin to specify the date range for which the rebate type applies to the transactions. The other options are either not possible or not sufficient to achieve the desired result. For example, setting up a new rebate program with a single payout period for Jan does not ensure that the rebate type is valid only for transactions completed in January. Setting the rebate type to active on Jan1 and inactive on Jan31 does not prevent the rebate type from being applied to transactions that occurred before or after January. Using the effective date on rebate type does not specify the end date for the rebate type validity. References: Eligible and Applied Rebate Types on a Transactional Object, Common Rebate Types