Updated: August 6, 2019

The best and most efficient way to make a ton of money in GTA Online is to do these heists, especially if they're done on hard mode. Risking a heist in hard mode should only be done with a team of experienced GTA 5 players, though, as its difficulty level definitely lives up to its name. GTA 5 - How to Earn One Million Dollars in 15 Minutes. The most efficient way of making money in game! First of all, I would like to mention that this glitch has been live for quite some time, where it has its roots from glitching Pacific Standard heist finale.

Simple ways of tricking the system and get unlimited chips and goodies.

By playing this, you could earn some sweet and helpful rewards that could help you to advance in GTA 5 Online. After that, roam around aimlessly just to make sure you familiarize yourself with the map. Doing this will make it easy for you to navigate around, completing missions, and getting better at this game.
GTA 5 Tips and Tricks. You should try to sell your cars to the best seller and make money. There are three types of cars in different ranges. The first one is of standard range and you can get 30k. The second car is of middle range and you can get 60k. The third car is of the top range and you can earn 80k from it.

Other GTA Guides:

100% Completion Guide!
Advanced Nightclub Guide.
Beginner's Guide (GTA Online).
Advanced Smuggler's Run Guide.
Advanced Guide for MC Business.
How to Make Easy Money Everyday (Solo Guide).
All Action Figures Locations (GTA Online).
All Playing Cards Locations (GTA Online).
Mobile Operations Center (MOC) Guide.
All Peyote Locations (GTA Online).
Quick Guide for the Oppressor.
Guide to Combat Aircraft.
Import / Export Guide.
How to Use Mods?
Terrorbyte Guide.
Cheat Codes.

UPD! [Fixed]

It is fixed, it might still work but when you win via this exploit after a short period of time you'll get placed into singleplayer.
Better way of making money can be found here.

Inside Track

To make the most profit in casino chips - head on down to the horse betting area and sit down at any of the machines.
You will be greeted with this screen and we will only be focusing on the single events section. Click the place bet button on the right to enter the betting screen.
You will be greeted with a list of horses on the left displaying different odds of them winning. (skip this paragraph if you already know how the game works normally). The higher up the list, the greater the chance of them winning. However, the horses with lower odds of winning will give a higher payout if they do win. You will only get money back if the horse you bet on comes in first place. Choose a horse and the betting screen on the right appears. This is where you select the amount of money you want to bet and when you are ready you place the 'place bet' button to start the race.
At this point, we can perform the simple exploit. Once you have selected your horse, make sure the current amount you are betting is 100 chips. Hover the courser over the right arrow to increase the bet, and in one single action, you must click and hold the mouse then immediately move over the place bet button. Keep holding the mouse button down until the race is over half way done. You will know you have done it right if at the start of the race it has charged you 200 or 300 chips. On the occasion that your chosen horse wins, you will be paid as if you bet the max amount of chips, but you only paid 200.
Summary:

How To Earn The Most Money In Gta 5 Online

Choose horse.
Make sure current bet is 100.
Hover over the increase bet right arrow >
Click and hold the mouse, starting over the increase bet arrow then bring it down to the place bet button.
Keep holding that same mouse click until the horses have reached the half way mark at least.

How To Earn The Most Money In Gta 5 online, free

Get lucky and enjoy payout when your horse wins!

Lucky Wheel

The daily spinning wheel can also be tricked by killing the game before you win a prize you eventually didn't want. By doing it, I make my game windowed mode and open up the task manager, where I end the process before I win the prize. When you go back in the game, you'll realise you're able to spin it again.

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