Contribution deferral limits There is a maximum limit on the total yearly
employee pre-tax or Roth salary deferral into the plan. This limit, known as the "402(g) limit", was $19,000 for 2019, $19,500 for 2020–2021, $20,500 for 2022, $22,500 for 2023, and $23,000 for 2024. For future years, the limit may be indexed for inflation, increasing in increments of $500. Employees who are at least 50 years old at any time during the year are now allowed additional pre-tax "catch up" contributions of up to $6,000 for 2015–2019, and $6,500 for 2020–2021. Some plans also have a profit-sharing provision where employers make additional contributions to the account and may or may not require matching contributions by the employee. These additional contributions may or may not require a matching employee contribution to earn them. As with the
matching funds, these contributions are also made on a pre-tax basis. There is also a maximum 401(k) contribution limit that applies to all employee and employer 401(k) contributions in a calendar year. This limit is the section 415 limit, which is the lesser of 100% of the employee's total pre-tax compensation or $56,000 for 2019, or $57,000 in 2020.
Contribution deadline For a corporation, or an LLC taxed as a corporation, contributions must be made by the end of a calendar year. For a
sole proprietorship, partnership, or an LLC taxed as a sole proprietorship, the deadline for depositing contributions is generally the personal tax filing deadline (April 15, or September 15 if an extension was filed).
Highly compensated employees (HCE) To help ensure that companies extend their 401(k) plans to low-paid employees, an IRS rule limits the maximum deferral by the company's highly compensated employees (HCEs) based on the average deferral by the company's non-highly compensated employees (NHCEs). If the less compensated employees save more for retirement, then the HCEs are allowed to save more for retirement. This provision is enforced via "non-discrimination testing". Non-discrimination testing takes the deferral rates of HCEs and compares them to NHCEs. In 2008, an HCE was defined as an employee with compensation greater than $100,000 in 2007, or as an employee that owned more than 5% of the business at any time during the year or the preceding year. In addition to the $100,000 limit for determining HCEs, employers can elect to limit the top-paid group of employees to the top 20% of employees ranked by compensation. Automatic 401(k)s are designed to encourage high participation rates among employees. Therefore, employers can attempt to enroll non-participants as often as once per year, requiring those non-participants to opt out each time if they do not want to participate. Employers can also choose to escalate participants' default contribution rate, encouraging them to save more. The
Pension Protection Act of 2006 made automatic enrollment a safer option for employers. Prior to the Pension Protection Act, employers were held responsible for investment losses as a result of such automatic enrollments. The Pension Protection Act established a safe harbor for employers in the form of a "Qualified Default Investment Alternative", an investment plan that, if chosen by the employer as the default plan for automatically enrolled participants, relieves the employer of financial liability. Under Department of Labor regulations, three main types of investments qualify as QDIAs: lifecycle funds, balanced funds, and managed accounts. QDIAs provide sponsors with fiduciary relief similar to the relief that applies when participants affirmatively elect their investments.
Fees 401(k) plans charge fees for administrative services, record-keeping services, investment management services, and sometimes outside consulting services. They can be charged to the employer, the plan participants or to the plan itself and the fees can be allocated on a per participant basis, per plan, or as a percentage of the plan's assets. For 2011, the average total administrative and management fees on a 401(k) plan was 0.78 percent or approximately $250 per participant. However small businesses can suffer especially higher plan fees. The United States Supreme Court ruled, in 2015, that plan administrators could be sued for excessive plan fees and expenses, in Tibble v. Edison International. In the Tibble case, the Supreme Court took strong issue with a large company placing plan investments in "retail" mutual fund shares as opposed to "institutional" class shares.
Top-heavy provisions The IRS monitors defined contribution plans such as 401(k)s to determine if they are top-heavy, or weighted too heavily in providing benefits to
key employees. If the plans are too top-heavy, the company must remedy this by allocating funds to the other employees' (known as non-key employees) benefit plans. ==Plans for certain small businesses or sole proprietorships==