Despite its retroactive nature, children born before an annulment are considered legitimate in many countries.Reasons for a void marriage may include, depending on jurisdiction, consanguinity (incestual marriage), bigamy, group marriage, child marriage.
Canon law stipulates canonical impediments to marriage.
The validity of a voidable marriage can only be made by one of the parties to the marriage; thus, a voidable marriage cannot be annulled after the death of one of the parties.
A marriage can be voidable for a variety of reasons, depending on jurisdiction. In countries where marriage law is influenced by religion (especially Roman Catholicism) there can be numerous reasons for a marriage to be voidable (see section below).
Unlike divorce, it is usually retroactive, meaning that an annulled marriage is considered to be invalid from the beginning almost as if it had never taken place (though some jurisdictions provide that the marriage is only void from the date of the annulment; for example, this is the case in section 12 of the Matrimonial Causes Act 1973 in England and Wales).
A difference exists between a void marriage and a voidable marriage .
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Lack of any of these conditions makes a marriage invalid and constitutes legal grounds for a declaration of nullity.