The easiest way to understand the new Solo 401(k) guidelines is to remember three things:
- There are two types of contributions (Salary Deferral and Profit Sharing) and they have different rules.
- There are two deadlines that affect each kind of contribution: Plan Creation deadline and Contribution deadline.
- The two deadlines can be different for the same contribution.
Now let’s take a look at the two types of contributions.
The Salary Deferral contribution was not changed under the new guidelines. In order to make a Salary Deferral contribution, the Solo 401(k) plan must be created by December 31. The contribution deadline is variable. If your plan is sponsored by an incorporated entity, then contributions must be made within seven days of running payroll. If it is unincorporated, then you have until the tax filing deadline (with all applicable extensions) to make your contribution.
The Profit Sharing contribution was changed under the new guidelines. Now both the Plan Creation deadline and the Contribution deadline are the same as the tax filing deadline.
Here’s a chart to help visualize the current guidelines. Note that only one deadline has changed with the new rules: the Profit Sharing Plan Creation deadline.
Table 1: Solo 401(k) Guidelines