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401(k)s are tax-advantaged plans that allow you to put money aside through your employer's payroll deductions. Since their inception 40 years ago, 401(k) plans have become the retirement plan of choice for most employers, largely replacing traditional pension plans. If you'd like to know more about whether a 401(k) is right for you, the different rules and how to set one up, start with our beginner's guide: 10 things you should know about 401(k)s then work your way through our other features and guides on 401(k)s to get all the information you need.