
Bigamy, the act of marrying someone while already married to another person, is a criminal offence in Australia. Section 94 of the Marriage Act 1961 (Cth) defines bigamy as a person who goes through the form or ceremony of marriage while already married. The offence carries a maximum penalty of five years' imprisonment. While bigamy is illegal in Australia, polyamorous relationships are legal as long as they are not formalised by marriage. Foreign polygamous marriages are also not recognised in Australia.
| Characteristics | Values |
|---|---|
| Is bigamy illegal in Australia? | Yes |
| Countries where bigamy is legal | United Arab Emirates |
| Maximum penalty for bigamy in Australia | 5 years imprisonment |
| Maximum penalty for bigamy in a local Australian court | 12 months imprisonment |
| Defence for bigamy | If the defendant believed their spouse was dead |
| Defence for bigamy | If the defendant's spouse had been absent for a long time and there were reasonable grounds for presuming they were dead |
| Defence for bigamy | 'Honest and reasonable mistake' |
| Bigamy offence creation year | 1603 |
| Bigamy law in Australia | Section 94 of the Marriage Act 1961 |
| Bigamy law definition | "A person who is married shall not go through a form or ceremony of marriage with any person" |
| Bigamy offence | If a person who is married declares that they are not married |
| Bigamy offence | Giving a defective notice |
| Bigamy offence | If a person who is married goes through a marriage ceremony with another person |
| Bigamy offence | If a person goes through a marriage ceremony with someone they know to be married |
| Bigamy offence | If a person who is married enters into a marriage with another person |
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What You'll Learn

Bigamy is a federal offence in Australia
The offence of bigamy carries a maximum penalty of five years' imprisonment. However, if the offence is heard summarily in a local court, the maximum penalty is reduced to 12 months' imprisonment. It is important to note that bigamy charges are rare in Australia. In one case, a Perth man was arrested and charged with bigamy for allegedly being married to two women simultaneously.
It is a defence against prosecution for bigamy if the defendant can prove that they genuinely believed their spouse was deceased at the time of the subsequent marriage. For this defence to hold, the defendant's spouse must have been absent for a considerable period, providing reasonable grounds for presuming their death. Additionally, the mistake of fact defence is available, as seen in the case of Mr Stevenson, who moved to Australia from New Zealand without divorcing his first wife. However, his defence of an "honest and reasonable mistake" failed because he had received training as a priest and had attended a marriage course.
While polygamy and bigamy are complex and sensitive issues that have sparked significant attention and debate in Australia, they remain illegal. Australian law defines marriage as the union of two people to the exclusion of all others, and this definition was updated in 2017 to recognise same-sex marriages. It is worth noting that polyamorous relationships are legal in Australia as long as they are not formalised by marriage.
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Bigamy carries a maximum penalty of five years imprisonment
Bigamy is a criminal offence in Australia. The offence is outlined in the Marriage Act 1961, which states that a person who is married "shall not go through a form or ceremony of marriage with any person". In other words, it is illegal to marry someone when you are already married to someone else. This is the case even if the first marriage took place in another country.
Bigamy carries a maximum penalty of five years' imprisonment. However, if the offence is heard summarily in a local court, the maximum penalty is 12 months' imprisonment.
There are a couple of defences that can be used to avoid prosecution for bigamy. One is the 'mistake of fact' defence, where the defendant genuinely believed that their spouse was deceased at the time of the subsequent marriage. Another is the 'honest and reasonable mistake' defence, though this was unsuccessful in the case of Mr Stevenson, who was originally from New Zealand and moved to Australia without divorcing his first wife. Mr Stevenson then married an Australian woman, whom he subsequently divorced before marrying another. The court found that Mr Stevenson's guilty mind was indicated by the fact that neither of his Australian wives knew about his first wife.
It is important to note that while bigamy is illegal in Australia, polyamorous relationships are not. These may even be de facto relationships, with people living together and raising children. However, polyamorous relationships are only legal as long as they are not formalised by the act of marriage.
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Bigamy defence: reasonable grounds to presume spouse was dead
Bigamy is a federal offence in Australia under Section 94 of the Marriage Act 1961 (Cth). This law states that "a person who is married shall not go through a form or ceremony of marriage with any person". The maximum penalty for bigamy is five years' imprisonment.
A mistake of fact is a possible defence against a bigamy charge. For example, a person may have genuinely believed that their spouse was deceased at the time of their subsequent marriage. To be considered a valid defence, the defendant must prove that:
- At the time of entering the second marriage, they believed their spouse was dead.
- Their spouse had been absent for a period of time and under circumstances that provided reasonable grounds to presume their spouse was dead.
According to a 1986 report by the Australian Law Reform Commission, the prosecution must prove beyond a reasonable doubt that the form or ceremony of marriage was one recognised under the Act. Additionally, the defendant must prove that their spouse had been continually absent for at least seven years preceding the date of the alleged offence, and that they had no reason to believe their spouse was alive during that period.
It is important to note that polyamorous relationships are legal in Australia as long as they are not formalised by marriage.
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Overseas marriages recognised if valid under local law
In Australia, an overseas marriage will be recognised as valid if it was valid under the local law at the time it was solemnised. This means that the marriage must be recognised under the law of the country where the marriage took place and it would have been recognised as a valid marriage under Australian law if it had occurred in Australia.
The rules that govern whether an overseas marriage is valid under Australian law are found in the Marriage Act 1961. This Act sets out the reasons that would make an overseas marriage invalid in Australia. These reasons include: at the time of the marriage, one of the parties was validly married to another person; one of the parties was not of marriageable age in Australia; the parties are too closely related to marry; or consent to the marriage by either of the parties was not real consent.
It is important to note that while a marriage that takes place overseas can't be registered in Australia, it will generally be recognised if it meets the above criteria. Recognised marriages include overseas same-sex marriages that occurred prior to December 2017. In addition, a foreign marriage certificate is usually accepted as proof of the marriage, but it may not be sufficient proof of a name change.
If you plan to marry overseas, it is recommended to contact the country's embassy, consulate, or local representative in Australia to understand the legal requirements. Some countries may require specific documentation, such as a Certificate of No Impediment to Marriage, to ensure that individuals are free to marry.
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Polygamy is not legally recognised in Australia
Polygamy is not recognised by Australian law. The legal definition of marriage in Australia is the "union of two people to the exclusion of all others". This definition was changed in 2017 to recognise same-sex marriages.
Bigamy, the act of marrying someone while already married to another person, is a criminal offence in Australia. Section 94 of the Marriage Act 1961 (Cth) states that "a person who is married shall not go through a form or ceremony of marriage with any person". The maximum penalty for bigamy is five years' imprisonment.
While polygamy is not recognised by Australian law, polyamorous relationships are legal. These may even be de facto relationships, with people living together and raising children. However, polyamorous relationships are not recognised if they are formalised by marriage.
Foreign polygamous marriages are also not recognised in Australia. However, a foreign marriage that is not polygamous but could become polygamous at a later date under the law of the country where the marriage took place is recognised in Australia.
Some have advocated for the legalisation of polygamous marriages in Australia, stirring a controversial and emotional debate.
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Frequently asked questions
Yes, bigamy is illegal in Australia. It is a criminal offence to marry someone while already being married to someone else.
Bigamy carries a maximum penalty of 5 years imprisonment. If the offence is heard summarily in a local court, the maximum penalty is 12 months imprisonment.
The legal definition of marriage in Australia is the union of two people to the exclusion of all others, voluntarily entered into for life.
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