Federal requirement: We have two types of deductions for our retirement. We have a regular 401K pre-tax option and we have a 401K Roth deduction. Employees can elect one or a combination of both. I keep running into an issue when employees elect both. As you know the deferred comp limit for this year is $18,500 for 2018 but these two codes in my system do not "talk" to each other and I often end up having people over withheld.