Lynch said his organisation had approached the Government a year ago to make the change, which came into force yesterday.
Commerce minister Craig Foss said the previous regulatory requirements had been unnecessary.
"As these products are low-risk and easier for consumers to understand, the current regulatory requirements are unnecessary," Foss said. "The cost of adhering to the current requirements is preventing some credit unions from advising their members on how to best meet their savings goals."
Lynch said the change was one of a number his organisation was seeking to even up the regulatory playing field between credit unions and the banks.
He also wants credit unions to be directly regulated by the Reserve Bank rather through a trustee, the ability to lend to small and medium-sized businesses, and changes to credit rating requirements.
The Government is reviewing the rules governing non-bank deposit takers and is due to report back in September.