My tax credit property stayed 100% with a waiting list, so leasing bonuses were not considered. A renewal bonus of a certain amount, if the lease and all paperwork is completed and filed by the recert date would be a nice incentive.
We also got bonuses for NOI, score on shopping report. Consider a bonus for the number of days a unit is vacant. If vacant less than 7 days (whatever your turn-around time is), bonus.