How does the burden of proof differ for adultery versus other divorce grounds?

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The Burden of Proof for Adultery in Civil Divorces is Higher Than for Unreasonable Behaviour

In Singapore's civil divorce proceedings, establishing adultery as grounds for divorce carries a significantly higher burden of proof compared to citing "unreasonable behaviour." This disparity is a primary reason why fewer than one in 100 civil divorces were filed on the grounds of adultery in 2025, with 48.7 per cent instead citing unreasonable behaviour. The legal framework under the Women's Charter requires proof of irretrievable breakdown through one of six recognised facts, and adultery demands more stringent evidence than other grounds.
Adultery Requires Compelling Circumstantial Evidence

Proving adultery in a civil divorce typically necessitates compelling circumstantial evidence. This often includes reports from private investigators or photographic evidence that substantiates a sexual relationship between a spouse and a third party. This elevated evidential threshold means that infidelity, while potentially a cause for marital breakdown, is less frequently used as the direct legal basis for divorce compared to broader grounds.
Unreasonable Behaviour Offers a Broader Evidential Scope

Unreasonable behaviour serves as a more encompassing legal ground for divorce, covering a wide spectrum of conduct. This can include various forms of abuse, controlling actions, addiction, gambling, financial neglect, and even extra-marital affairs. The wider scope of what constitutes unreasonable behaviour makes it simpler to establish in court, consequently leading to its prevalence as the most commonly cited reason for civil divorce.
Muslim Divorce Statistics Reflect Differing Reporting Practices

The distinction in divorce grounds is also evident when comparing civil and Muslim divorces. While infidelity was cited as the main issue in 18.4 per cent of Muslim divorces in 2025, lawyers note this reflects differences in how reasons for breakdown are recorded. Unlike civil divorces where adultery must be proven as a legal fact, Muslim divorce statistics record the given reason for the marriage breakdown, making it easier to cite infidelity directly. This does not necessarily imply that adultery is substantially more common among Muslim couples.

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How does the burden of proof differ for adultery versus other divorce grounds?

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