Officials have warned David Seymour's Regulatory Standards Bill could be much more expensive than previous estimates suggested, and could lead to business uncertainty, slowing economic growth.

Officials have warned David Seymour's Regulatory Standards Bill could be much more expensive than previous estimates suggested, and could lead to business uncertainty, slowing economic growth.

The cost of the ACT leader's Regulatory Standards Bill work could be as high as $60m a year, officials say.