when are loudoun county property taxes due
- When is my personal property tax payment due? Personal property tax is billed semi-annually. Tax due dates for property located in Loudoun on January 1 are May 5 and October 5. Due dates for property bought in/acquired after January 1 are as follows: 1  January 1 - March 31. Tax due date is May 5 & October 5. 2  April 1 - July 31. Tax due date is October 5. 3  August 1 - December 15. Tax due date is December 5 or variable waiver date.