Contribute to your retirement using automatic withdrawals from your chequing account. If you are a segregated fund investor, a pre-authorized contribution (PAC) plan will allow you to contribute as little as $50 a monthly into an investment portfolio that is designed for your risk tolerance. Monthly contributions allow you to take advantage of dollar-cost-averaging, a strategy that can help lower investment risk. Dollar-cost-averaging can lower investment risk since you will be automatically buying fewer units when prices are high and more units when prices are low.