Va. Code Ann. § 15.2-2629

Any locality may borrow money and issue its notes in anticipation of the collection of the taxes and revenues of the locality for the current year, but the principal amount of the notes may not exceed the anticipated revenues for such year. Such notes shall mature and be paid within one year from the date they are issued. No extension of such notes shall be valid and no additional notes shall be issued under this section until all notes issued during preceding years have been paid.