Employers in Pennsylvania must conform with these state rules relating to filing income tax withholding returns.
Periodic Returns. Form PA 501 due semimonthly within 3 banking days of 15th and last day of month if employer withholds $1,000 or more per quarter; monthly by 15th day of following month (except return for last month of year is due January 31) if employer withholds at least $300 but less than $1,000 per quarter.
Quarterly on Form PA 501/W-3 by last day of month following end of quarter if employer withholds less than $300 per quarter.
Semi-weekly payments may be required for some employers.
Annual Reconciliation Returns. None.