Standard monetary bonuses in the game are:

Win a round: $3250 (awarded at the beginning of the following round)
Lose a round: $1400 + $500 per round lost over 1 (to maximum $3400) (awarded at the beginning of the following round)
Kill an enemy: $300 (awarded instantly)
Instruct a hostage to follow: $150 (awarded instantly. Only works once per hostage, per round)
Rescue a hostage: $1000 (awarded instantly)
Plant the bomb: $800 (awarded at the beginning of the following round)