 After his competitive career, Voltaire was retired for breeding, standing at Dutch veterinarian Jan Greve's stud De Watermolen.Voltaire was a Keur and Preferent stallion with the KWPN, and was one of the top KWPN jumping sires during his life.Voltaire stood at the stud until his death at the age of 25, when he suffered from a heart attack while covering a mare.