A TFSA improves savings incentives for low- and modest-income individuals because neither the income earned in a TFSA nor withdrawals from it affect eligibility for federal income-tested benefits and credits, such as the Canada Child Tax Benefit, the GST credit, the Age Credit, Old Age Security and Guaranteed Income Supplement benefits.

Scenario:
Alexandre and Patricia, a modest-income couple, expect to receive the Guaranteed Income Supplement (GIS) in addition to Old Age Security and Canada Pension Plan benefits when they retire. They have saved for a number of years in their TFSA and now earn $2,000 a year in interest income. Neither this income, nor any TFSA withdrawals, will affect the GIS benefits (or any other federal income-tested benefits and credits) they expect to receive. If this $2,000 were earned on an unregistered basis, it would reduce their GIS benefits by $1,000.