The IRS 401(k) retirement plan is funded by employee contribution and a matching employer contribution. The major feature of the plan is that the contributions are taken from pre-taxed salary. The fund accumulates tax-free until it is withdrawn. Most businesses and tax-exempt organizations can create these retirement plans.
The 401(k) takes its name from the IRC (Internal Revenue Code) of 1978. The operation of the 401(k) is administered by the EBSA (Employee Benefits Security Administration) of the Department of Labor.
The IRS 401(k) plan has a lot of advantages. First and foremost is that the employee can contribute pre-tax money that reduces the tax paid in each paycheck. Also, the company contribution and any growth in the fund is free of tax until withdrawn.