I am a combined monthly filer. Do I include any additional PSD Code information in Box 20 of my employees’ W2s?

Yes. Report the two-digit Tax Collection District (county) code at the end of the physical workplace location code in Box 20 of the W2. This will indicate where you filed the payroll tax as a combined monthly filer.

For example, if your employee works in Allentown (Lehigh County), and you are a combined monthly filer with Keystone from your central payroll office located in Easton City (Northampton County), enter 390101-48 in the employee’s W2 Box 20.