from Wiki (note this is when a Court of Love is mandatory, and not necessarily when Excommunication is mandatory)
When a disciplinary council is mandatoryEdit
The LDS Church has instructed leaders that a disciplinary council is mandatory when evidence suggests that a member of the church may have committed any of the following offences against the standards of the church:
Murder: the "deliberate and unjustified taking of human life". The church does not classify killings performed by*police*orsoldiers*in the line of duty as being murder. It also does not classify*abortion*as murder.[13]
Incest: defined as "sexual relations" between a parent (or grandparent) and a natural, adopted, or foster child or a stepchild. It also includes sexual relations between siblings.[13]
Apostasy: refers to members who "repeatedly act in clear, open, and deliberate public opposition to the Church or its leaders" and also includes those who repeatedly present information as church doctrine that is not church doctrine and those who repeatedly follow the teachings of apostate sects or those who formally join another church. Merely failing to attend church meetings does not qualify as apostasy.[13]*In November 2015, the church clarified that its members who are in a*same-sex marriage*are in apostasy.[14]
Serious transgression while holding a prominent church position*: "serious transgression" is defined as "a deliberate and major offense against morality" and includes "attempted murder, rape, sexual abuse, spouse abuse, intentional serious physical injury of others, adultery, fornication, homosexual relations (especially sexual cohabitation),[15]*deliberate abandonment of family responsibilities, robbery, burglary, theft, embezzlement, sale of illicit drugs, fraud, perjury, and false swearing."[13]*"Prominent church position" includes the positions ofarea seventy,*temple president,*mission president,*stake president,*patriarch, andbishop.[13]
Transgressor who is a*predator[13]
Pattern of serious transgressions[13]*(as defined above)
Serious transgression (as defined above) that is widely known[13]