The only creditor who can garnish your Old Age Security is Canada Revenue Agency.  However, once it's deposited into a bank account, those funds can be seized by any creditor who has a judgment against you or, if you owe money to the same financial institution that your money is deposited with, that financial institution can seize the funds and apply them against your debt with them.

Judy Scott
Trustee
Meyers Norris Penny Limited
Port Moody - Abbotsford
604-949-2113
judy.scott@mnp.ca