Example :
If you're taxed at 40% and you contribute $3,000 to an RRSP, your
income tax return will be $1,200 (3,000 x 40% = 1,200).
If you're taxed at 40% and you borrow $2,000 to add to your initial
RRSP contribution of $3,000, you'll get $2,000 back
(5,000 x 40% = 2,000).
So your income tax return repays the entire loan, and you've saved $5,000 instead of $3,000 for your retirement.