Yes, there's a limit on the total amount of money you can transfer to an income stream without paying extra tax. This is known as the transfer balance cap.
For the 2024-25 financial year, the transfer balance cap remains at $1.9 million. If you have a number of income streams (either QSuper income streams with Australian Retirement Trust or income streams from multiple super funds), your combined account balances will all count towards this limit. Visit the ATO website for more information about the transfer balance cap.