Can I have more than 3 box 14 'other' withholdings?

No. The W2 form is limited to a maximum of 3 withholdings for box 14 (other withholdings). This is an IRS limitation based on the size of the form. In most cases box 14 is optional; its purpose, according to the IRS instructions, is “for any other information that you want to give to your employee”. Consider printing the report called “Employee Earning / Withholding Summary” and include it with the W2 for each person. This report gives all the detail anyone should need as to what was withheld for each category.

If you assign more than 3 withholdings to box 14 (using the Procare W2 Software) you’ll get a message stating that only the first 3, with an amount greater than zero, will be included for each employee. Of course you may manually edit the W2s as needed. See also: Can I combine withholdings together for box 14?