Summary Most studies on the language use of Malaysian Tamils focus on the upkeep of the Tamil language. There is, however, a dearth of investigations into language use in a multilingual context among the younger generation of speakers. The present study aims to fill this gap by using Fishman’s (1972) domain model to examine the language used by Tamil youth in intra-group communication in seven domains. Data were collected from 109 questionnaires, 42 audio-recordings of natural conversations and 40 interviews. The findings revealed that in four domains, which were the family, friendship, religion, and neighbourhood, Tamil is used more frequently. The highest usage of the language is predominantly among friends. However, there was a decreasing use of Tamil in the family domain among the younger generations with many married participants claiming to use English rather than Tamil as the home language. This does not bode well for the maintenance of Tamil as a first language in the future. The findings show how participants’ use of Tamil, English and Malay is linked to concepts of identity, solidarity, and their perceptions of these languages. The findings also point to the development of a localised variety of Tamil reflective of the Malaysian cultural landscape.