All 401(k) plan contributions have deposit deadlines, and it’s up to 401(k) fiduciaries to meet them. Yet, many are unclear about the deadlines applicable to their 401(k) plan. That confusion can easily lead to late contributions.Most of the confusion surrounds the deadline to deposit amounts withheld from employee wages, i.e., 401(k) pre-tax, 401(k) Roth, and/or participant loan repayments. Passed into law in 2004, the Department of Labor (DOL) set forth the rules to comply with the safe ...