The governing body will not stand in the way of players participating, even if it prevents them from resting during a busy 2019 international schedule, but have made it clear to them they are expected to put country before franchise when commitments clash.
The players union, which is working with CA to foster an improved relationship, has given its qualified support but said it did not want restrictions in future years.
Players will not be released by CA to play in the IPL until they have completed their state and/or international commitments.
Australia play a five-game one-day international series against Pakistan which is due to finish on March 31, according to a draft fixture obtained by Fairfax Media, two days after the IPL is reportedly to start.
World Cup squad members are required to attend a mandatory camp starting in early May which will run through to the team's departure for England, ruling them them out of the finals.
There are concerns players' "pick-ability" will be adversely affected by their absence at the start and finish of the competition.
Players are paid pro rata on matches played so stars such as Chris Lynn and Glenn Maxwell, with IPL contracts worth in excess of $1.75 million, will be sacrificing as much as $500,000 each if picked.
Pat Cummins, who has been a regular in the ODI side, stands to forego close to $350,000 while Smith and Warner, both on $2.4 million deals, will miss out on close to $800,000.
Andrew Tye ($1.4 million IPL contract), Marcus Stoinis ($1.2 million), D'Arcy Short ($775,000), Nathan Coulter-Nile ($426,000) are among other World Cup contenders with IPL deals.
CA-contracted players are well paid with those at the top end earning well in excess of $1 million.
CA can choose not to issue players No Objection Certificates (NOC), which are required to play in international T20 tournaments like the IPL, but it would take an extraordinary circumstance for that to happen.
All-rounder Stoinis last week said he and his teammates were "drained" just two games into the home international season due to their heavy workloads.