Parsi identity fuses religion with this particular history of exile and settlement, and over the centuries the community developed customs and a calendar somewhat distinct from those of the Zoroastrians who remained in Iran. The Parsis became notable in Indian commercial, industrial, and civic life while sustaining their religious institutions. The affirmation of descent from the migration is thus both a historical memory and a marker of communal identity, complementary to the parallel Irani identity of the Zoroastrians who stayed in the homeland. The Parsi community's strict tradition of endogamy, historically denying full membership to children of interfaith marriages and to women who marry outside the faith, has produced serious modern legal conflict as the population has declined through low birth rates and increasing outmarriage.
In one prominent case, Goolrukh Gupta, a Parsi woman married to a Hindu, petitioned after Gujarat's High Court ruled in 2010 that she had forfeited her religious rights by marrying outside the community; India's Supreme Court later found in her favour, holding that marriage outside the faith does not strip a Parsi woman of the right to practise her religion, including funeral rites at the Tower of Silence, though individual Parsi trusts have continued to apply the traditional rule inconsistently.