This is a question I encounter more often than people might expect, and it always comes from a place of real distress — clients who have discovered, sometimes decades into a marriage, that something was fundamentally wrong with the marriage from the very beginning. The good news, legally speaking, is that yes, a marriage can absolutely be declared void in Mumbai even after many years of cohabitation, provided the marriage falls within the specific categories that Indian law treats as void ab initio, meaning void from the very outset, regardless of how much time has passed since the wedding.

Under Section 11 of the Hindu Marriage Act, 1955, a marriage is void — not merely voidable, but void from inception — if it contravenes any of the conditions specified in clauses (i), (iv), and (v) of Section 5 of the Act. This includes situations where either party had a spouse living at the time of the marriage, meaning the marriage is bigamous and void under the principle that a valid subsisting marriage bars a second marriage; where the parties are within degrees of prohibited relationship unless a custom or usage governing each of them permits such a marriage; or where the parties are sapindas of each other unless a custom or usage permits such a marriage. If your marriage falls into any of these categories, the law treats it as though it never validly existed, and this legal reality does not change simply because you and your spouse have lived together, raised children, or built a life together for years or even decades.

This is precisely the point that surprises many clients: unlike voidable marriages under Section 12, which typically carry limitation periods requiring the petitioner to act within a specific window after discovering the ground, a void marriage under Section 11 does not extinguish with time. Because the marriage is legally a nullity from day one, there is generally no limitation period preventing you from seeking a formal declaration of nullity, even after twenty or thirty years of cohabitation. Courts have consistently held that a decree under Section 11 is essentially declaratory in nature — it confirms a legal status that already existed, rather than creating a new legal consequence — and this is why the passage of time does not bar the remedy in the way it would for other matrimonial reliefs.

The most common scenario I encounter involves bigamy — where a spouse later discovers that their partner was already legally married to someone else at the time of their own marriage, and that earlier marriage was never legally dissolved through divorce or death. In such cases, the second marriage is void from the outset under Section 11 read with Section 5(i), and the aggrieved spouse can approach the Family Court in Mumbai for a formal declaration to that effect, regardless of how many years have elapsed since the wedding ceremony took place. This declaration carries significant practical consequences, particularly regarding property rights, inheritance, and the legal status of any children born from the union, which is why obtaining a formal court decree, rather than simply treating the marriage as informally over, is strongly advisable.

Importantly, children born from a void marriage are not rendered illegitimate as a matter of law. Section 16 of the Hindu Marriage Act specifically protects the legitimacy of children born from void or voidable marriages, ensuring they retain inheritance and legitimacy rights concerning their parents' property, even though the marriage itself is declared void or annulled. This is a crucial reassurance for clients who worry that pursuing a nullity declaration after many years might adversely affect their children's legal standing — it will not, and courts are careful to preserve this protection consistently.

If your situation involves a marriage solemnised under the Special Marriage Act, 1954, rather than Hindu personal law, an equivalent void marriage framework exists under Section 24 of that Act, covering similarly fundamental defects such as bigamy or violation of prohibited relationship conditions, again without the kind of strict limitation period that governs voidable marriages. Given how fact-specific these cases tend to be, particularly around proving the existence and continuation of an earlier marriage or establishing a prohibited relationship, it is genuinely worthwhile to have your documentation reviewed carefully, and Aapka Legal Advice can help you assess what evidence you'll realistically need to gather before filing.

To initiate this process, you would file a petition seeking a declaration of nullity before the Family Court in Mumbai with jurisdiction over your matter — generally where the marriage was solemnised, where you last resided together, or where the respondent currently resides. Your petition must set out clearly and specifically the factual basis establishing why the marriage falls within Section 11 — for instance, documentary proof of the earlier subsisting marriage in a bigamy case, including marriage certificates, or genealogical evidence in cases involving prohibited relationships or sapinda status. Because these cases often involve long-buried family history, gathering old records, witness testimony from relatives, and any documentary trail becomes especially important, and this is an area where experienced counsel makes a genuine difference to case outcomes.

While your nullity petition is pending, you can also seek ancillary relief, including maintenance under Section 25 of the Hindu Marriage Act if you are financially dependent, and if the discovery of the void marriage has caused you significant emotional and reputational harm, particularly in cases of concealed bigamy, you may separately consider pursuing criminal action against your spouse under Section 82 of the Bharatiya Nyaya Sanhita, 2023 (the provision addressing marrying again during the lifetime of a spouse, corresponding to the earlier Section 494 IPC), which criminalises bigamy independently of your civil nullity proceedings. For cases of this complexity and sensitivity, our panel of retired judges alongside senior criminal lawyers regularly provides consultative guidance on both the civil nullity strategy and any parallel criminal complaint you may wish to pursue.

When you're ready to proceed, the Top Divorce Lawyers in Mumbai | Aapka Legal Advice network can connect you with advocates experienced specifically in void marriage declarations and their intersection with property and inheritance disputes. To summarise, a marriage absolutely can be declared void in Mumbai after many years of cohabitation, provided it falls within the specific categories set out in Section 11 of the Hindu Marriage Act — bigamy, prohibited relationship, or sapinda relationship — and because such marriages are void from inception, the passage of time, unlike with voidable marriages, does not stand as a bar to seeking a formal declaration from the Family Court.