Heists are a mode in GTA Online wherein players must work together to complete an over-arching objective over a series of set-up missions and eventually a finale mission.
One player (who initiates the heist) serves as the group leader, and must front an initial sum of money in order to start the heist. This money is used to procure equipment and other various items, and will be recouped at the end. The Heist Leader will not recieve payments at the end of each setup mission, but instead will take their entire cut out of a percentage of the final take from the last mission in the heist. Prior to a heist, when working on the plan, it is best to all be working from the same Heists guide. Also, some players have not been happy with the cut that the leader of their heists has given, so you must have some faith in your leader.
The other three members of the heist team will recieve payouts at the end of each setup mission, and are free to come and go as they please if they want to leave a heist before the finale. Their cut of the final mission will usually be smaller than the Leaders, but this is made up for by all of the money made during the setups.
In order to initiate a heist and become a crew leader, players must be at least rank 12 in GTA Online and own a high-end apartment. Players who have completed the GTA Online tutorial and are rank 01 or higher can take part in setup and finale missions.
As of March 10, 2017, there are 5 heists available to play in GTA Online: gta 5