In the announcement, CBS Entertainment and Warner Bros.
The Big Bang Theory will see a 12th season.
Jim Parsons, who plays Sheldon, has won the Emmy for outstanding comedy actor four times.
Rauch (Bernadette) and Bialik (Amy) are holding out for salary parity with their co-stars after signing on to the series in season three. With the new deal, Cuoco, Parsons and Galecki will continue to each earn $1 million per episode, while Nayyar and Helberg, who used to earn slightly less, will earn the same amount as their co-stars thanks to "most favored nations" terms in their contracts.
Chuck Lorre, Bill Prady and Steven Molaro are executive producers, and Lorre and Prady are the creators. They will now be earning $900,000 an episode, according to THR.
The comedy, which focuses on physicists Leonard (Galecki) and Sheldon (Parsons) and their circle of friends and family, remains a top hit in its 10th season, averaging 19.8 million viewers with 7-day viewing counted, a double-digit milestone that few series reach.
They're taking a pay cut to create room in the budget for Mayim Bialik and Melissa Rauch to get substantial raises in this renewal.
Big Bang Theory comes with a hefty production cost of $10 million per episode. The network uses the comedy as a launchpad for new half-hours.
Next year CBS will air a "Big Bang Theory" prequel show called "Young Sheldon", which will be narrated by Jim Parsons as he chronicles his character's early life as a child genius.
The power of this comedy is apparent in its multi-season renewals.