The government is taking a much strong stance on these issues by enhancing verification activities and hiring specialists focused on detecting these activities. Individuals found guilty of evading tax has to repay the taxes owed and additionally pay interest and penalties. They could face jail up to 5 years and fines that equal 200% of the tax avoided. CRA has a Voluntary Disclosure Program that allows people to amend prior returns – this could allow people to avoid the above mentioned punishments. See your tax advisor or find one for help navigating through this.