While Grand Theft Auto IV isn't an RPG with extensive economic systems, managing Niko's money is important for acquiring weapons, armor, and enjoying the various activities Liberty City has to offer. Unlike previous GTA titles, money is less abundant, making smart spending crucial.

Sources of Income:
- Main Missions: The primary source of income.
- Side Missions: Vigilante, Taxi, Assassination missions (from contacts like Phil Bell or Derrick McReary).
- Drug Deals: A risky but potentially lucrative activity (requires specific contacts).
- Robbing Stores: Quick cash, but often results in a wanted level.
- Car Jacking/Selling Cars: Limited opportunities to sell cars for profit.
Key Expenses:
- Weapons & Ammo: Essential for combat. Purchase from Ammu-Nation or Little Jacob.
- Body Armor: Crucial for survival in firefights. Purchase from Ammu-Nation.
- Health: Fast food, restaurants, or calling Carmen.
- Clothes: Various clothing stores offer different styles.
- Taxi Fares: If you don't want to drive or use Roman's free service.
- Activities: Bowling, darts, pool, shows, strip clubs.
- Car Repairs: Pay 'Pay 'n' Spray to remove wanted levels and repair vehicles.
Tips for Money Management:
- Prioritize buying body armor before challenging missions.
- Only buy ammo for weapons you frequently use.
- Utilize Roman's free taxi service and Little Jacob's discounted weapons once unlocked.
- Don't be afraid to rob stores if you need quick cash, but be prepared for the police.
- Save money for later missions that might require specific purchases or investments.