Start-up founders say the federal government's CGT changes may see investment in new businesses go offshore. But Airtree Ventures co-founder Daniel Petre is warning against a scare campaign.

Albanese and Chalmers say they remain in consultation with tech sector, but give no indication of winding back proposed changes or giving CGT concessions

Keating-era adviser Don Russell has expressed support for entrepreneurs caught up in new CGT laws, as senior tech industry figures hunt specific change demands.