Defined contribution plans such as 401(k)s and IRAs became popular alternatives to defined benefit pension plans due to lower costs and risk for employers. With defined contribution plans, contributions are defined but the retirement amount depends on investment returns. Employees control investment choices and bear investment risk. Maximum annual contributions are $16,500 for 401(k)s and $5,000-$6,000 for IRAs, depending on age. Traditional IRA contributions are tax deductible while Roth IRA contributions are not tax deductible but withdrawals are tax free. Income limits apply for deductible IRA contributions.