The CESG adds up to 20% ($500 maximum) to your annual contribution to a Registered Education Savings Plan (RESP) per child annually, to a lifetime maximum of $7,200 or when the child turns 17 years old, whichever comes first.

Additional CESG
Families with net income less than $42,708^** may be eligible to receive up to $100 more CESG yearly for each of their children. The amounts contributed, up to the first $500 yearly to an RESP, may receive 20% of additional CESG (over the basic 20% CESG).
Families with a net income between $42,707 and $85,414** may be eligible to receive 10% additional CESG, up to the first $500 yearly (above the basic 20% CESG).