Cash is scarce in the first few hours of GTA 5, and this page describes How to Make Money in GTA 5, including perfectly innocent ways, and straight up cheats. if you need a extra few dollars to afford that shiny Grenade Launcher or Super Heavy Armor, read on.
The best way to make a lot of money in the story mode of GTA 5 is to complete Lester’s stock market assassination missions. Our Assassination Investor page details the steps required for developing your finances beyond the Billion dollar mark
Investing in Stocks
The old trick of buying low and selling high still applies to GTAV. Keep an eye on the news as well to see which stocks are doing good or bad.
To make a quick return, save your game and then shut off auto save. Invest all of your money into a stock that you think is on the rise. Go to your safehouse and rest without saving (or wait roughly 45 seconds) and check your portfolio to see your profit. Keep checking the stock until it peaks out and then sell. The more money you invest, the better the return, and if the stock does poorly, just load up your previous save and you will have all the money you invested without any repercussions.
Note that Franklins Assassination missions are a fool-proof way to invest wisely and make some serious cash, so wait until you finish the story modebefore you complete them so you can invest the most money with all three characters.
When to invest in GoldCoast (GCD)
Before you complete the Mission Legal Trouble, invest in AirEmu and sell it after the mission legal trouble then invest in the share FlyUS because it will fall dramatically. Once you complete the mission Meltdown (a few missionslater) the share price will return to what it was pre Legal Trouble. An example from my game, pre Legal Trouble the share price for AirEmu was about $200, FlyUS was around $25. Post Legal Trouble AirEmu went up to about $275 and FlyUS dropped to $12. Once the mission Meltdown was completed, FlyUS went back to around $24 which doubled my investment.
Armored Car Exploit
A user had reported that if an armored car can be taken by Michael without firing a shot, and if subsequently the police are quickly evaded, it may be possible to create an endless cash loop. Park the armored car in your garage and save the game. Then blow the doors off, leaving the car in the garage. Loot the car, then return later. The car will still be there, repaired and restocked with cash.