Bounty Vouchers are monetary rewards earned through combat against wanted ships. They can be redeemed at any station's local security office. They can also be redeemed at an Interstellar Factors contact at a minor penalty.
The amount of rewarded credits for each ship varies greatly and seems to depend mostly on ship class and combat rank. In general it goes that the heavier a ship, the higher the reward.
Ship Reward (CR) Sidewinder MkI 1,000 – 8,000 Eagle MkII
1,000 – 9,000 Cobra MkIII / MkIV 5,000 – 35,000 Viper MkIII / MkIV 10,000 – 30,000 Asp Explorer 14,000 Adder
1,500 – 10,000 Type-6 Transporter
3,000 – 20,000 Imperial Clipper
Federal Dropship / Gunship / Assault Ship
20,000 – 130,000 Anaconda
50,000 – 300,000