An annulment is when a court says your marriage is not legally valid. Annulments are rare, and can only be granted by a judge. Unlike a divorce, an annulment treats the marriage as if it never occurred. A marriage is always considered invalid if it is incestuous or bigamous (marriage to more than one person). Marriages may also be annulled if the marriage occurred due to force or fraud, if one of the spouses is too young to marry or already married, or if there is physical or mental incapacity. Similar to a divorce, the judge presiding over the annulment may determine issues of child custody, child support, alimony, and division of assets.