Avoid Damage
There's also no guarantee that you will walk away with the exact amount stated in this guide because as you get into combat situations and take damage you will lose a small amount of money for every hit you take. The amount lost is between 0.12% — 0.26% of the total cash you are carrying at the time. In practice, this means about $2,000 lost per shot.
That's why we always recommend you choose either the Big Con approach or the Silent & Sneaky approach for maximum profit, even if they are bit daunting. The Aggressive approach is fun and quick, but you risk losing quite a bit of your take due to amount of damage you will inevitably suffer.
Crew and Lester's Cuts
When calculating your final payout you also need to take your crew members' and Lester's cuts into consideration. Lester will take 5% of the total amount and your crew (hacker, driver, etc) payments will vary depending on who you have chosen (see our Support Crew guide for Big Con recommendations).
After that it is time for you and your heist-mates (the finale heist is for between 2 to 4 players) to split the percentages amongst yourselves. If two players carry out the heist then you can walk away anywhere between GTA$400,000 to GTA$800,000 each.
Looting Diamonds
The ability to loot diamonds from the Casino was actually locked when Rockstar first released the Diamond Casino Heist content. However, we then discovered that it was unlocked during the week of February 18, 2020 (i.e. for Valentine's Day).
It has now been confirmed that Rockstar has the ability to turn diamonds loot on and off, and that they will enable it for certain events, promotions or other significant dates.
Looting diamonds lets you take the maximum possible payout from the Diamond Casino Heist, which is $3.619 million. Once your support crew and Lester's cut are taken out, the amount left for players is $2,714,250.
Vault Time
Maximising the amount of time you get inside the vault is essential. Every second counts when it comes to looting it.
Whenever choosing the hacker for your heist we recommend that you always go for the best hackers available, which are Paige Harris and Avi Schwartzman. Paige is available by default and takes 9% of the cut. She gives you 3 minutes and 15 seconds in the vault. Avi takes 10% of the cut and gives you 3 minutes 30 seconds. We recommend Avi as 15 seconds extra can really make a difference in your end payout.
The time it takes for the animations to play out while you're looting must be considered when working out the time you'll have to work in the vault. On top of that, if you're carrying out the Casino Heist using either the Big Con approach or the Silent & Sneaky approach you must leave the vault before the timer runs out if you want to exit undetected. So adding those extra 15 seconds with Avi will allow you to loot the maximum possible content, increasing your final take.
Daily Cash Grab Secret Vault
During the heist you can also grab some extra cash from the secret vault, which is on the ground floor right next to the elevator. The switch to open up the secret vault door is in the CCTV room next to the elevator. You can expect somewhere between $50,000 to $100,000 to be in there. It will vary from heist to heist though.
If you grab the cash from this secret vault you also get an award for doing so called the "Daily Cash Grab", it gives you a 100 RP bonus too.
Overall Heist Cap Limit
The cap on the maximum overall amount you can take in a single heist is GTA$3.619 million. This means that even if you somehow get more than that capped amount, it will be of no use since the maximum you will be able to walk away with is still just GTA$3.619 million. This max amount is possible when you loot diamonds only.
Gold Bar Glitch
There was a glitch (now patched) which would let you respawn gold bars after you had collected all but the last one. Once you were left with just one gold bar on the tray, you could just back out of the grabbing animation and start taking them again. Then when you were in the grabbing position again, the gold would respawn. The glitch only worked once per gold cart/tray.
By using this glitch some players were reportedly able to "get" up to $4-$5 million. However, even so, due to the aforementioned GTA$3.6 million cap, they still only took away that lower amount. This also means that any other "glitches" that supposedly let you grab more than $3.6 million are useless.
By understanding these payout mechanics, you can better strategize your Diamond Casino Heist attempts for maximum profit.