The Commissioner has 7 years in which to begin proceedings to collect the premium tax and associated penalties and fines imposed pursuant to NRS 680B.027, 680B.039, 680B.040, 685A.180, 685A.190 and 685B.035, where the tax has been unreported or has been concealed by error or omission, and where the amount of the tax is known or through reasonable diligence should have been known.