http://www.bestplans.ca/investments/resp/resp_qa.asp
All capital gains, dividends and interest remain untaxed as they compound in an RESP, providing an effective and easy way to save for the swelling costs of post-secondary education.
http://www.stierfinancial.ca/education-programs.html
Are the contributions to an RESP tax deductible?
The money invested in RESP's earns interest dividends and capital gains tax-free, however the principal is not tax deductible. In addition, when the money is withdrawn for education tax applies only to the accumulated earnings, not the principle contributions. In contrast, the principle of an RRSP is fully taxable when withdrawn.
元本に対しても所得から「控除」になるRRSPとは異なり、所得に対しての影響は一切ないですが、RESP口座内でのキャピタルゲイン(投資での勝ち分や配当金、債券の利息、定期の利息)に対しては一切無税ですよ。