Good day, @Jim in New England.
Currently, adding a one-time 401K contribution is unavailable in QuickBooks Online (QBO). As a workaround, we can set up an annual maximum and per pay period for the employee. For the Annual Maximums company, contribution limits refer to IRS Retirement Topics - Contribution Limits.
Here are the steps to follow in setting up contribution to an employee:
1. Go to the Payroll menu, then Employees.
2. Choose the employee's name.
3. On the Employee details tab, click the pencil icon beside the Pay section.
4. Go to options #4 and #5 to add or remove pay types, deductions, and contributions.
5. Hit Done.
Please check this article for more information about adding or editing a deduction or contribution: Add Or Edit A Deduction Or Contribution.
You can check this link for the detailed process in setting up contribution: Retirement plan deductions/contributions.
Keep me posted on how this goes after following these steps. I’ll be right here to assist further.
