When starting a new job, employees should inquire about the company's 401(k) plan from human resources or knowledgeable managers to determine if they are eligible. If eligible, 401(k)s allow contributions of up to 15% of an employee's paycheck, with companies providing matching contributions. For those ineligible for a 401(k), alternatives include Roth IRAs, traditional IRAs, pensions, CDs or bonds. Roth IRAs offer tax-free growth of principal and fewer restrictions on withdrawals than other options.