Bail will be refused in all but extraordinary circumstances for anyone charged in NSW with an offence carrying a jail term who also has terrorism links, under the latest changes announced by Premier Mike Baird following the Martin Place siege.

The measures will apply to anyone under a terrorism control order; who has previously been convicted or is on bail for a Commonwealth terrorism offence; or is on bail for or has been previously convicted of being a member of a terrorist organisation.

NSW Premier Mike Baird: "It's really quite simple." Credit:Chris Pearce

As well, links to a terrorist organisation, actions and comments advocating support for terrorism or "violent extremism" or association with people or groups that advocate it will be considered when deciding if a person is an "unacceptable risk" for bail.

"It's really quite simple: if you have any links to terrorism in this state or country or anywhere you will not receive bail in NSW," Mr Baird said.