If the profile cheat is unavailable, you can modify your save file or use memory editors:
I'm the richest man in the Uplink world... - Uplink: Hacker Elite
You can use Cheat Engine to find the memory address for your current balance and change it to any amount. Uplink Money Cheats
Always ask for more money or "half up front" when accepting missions to maximize early-game cash flow.
While in the game, press F1 to bring up a secret menu that allows you to give your agent money and manage other stats. If the profile cheat is unavailable, you can
Start a new game and enter TooManySecrets as the name (case-sensitive).
This cheat may not work on all versions of the game, specifically version 1.2. Save Editing & External Tools While in the game, press F1 to bring
If you prefer playing within the game's mechanics, these "exploits" can net you millions of credits: