India will include caste details in its next census, a move likely to have sweeping socio-economic and political ramifications for the world's most populous country.

Information Minister Ashwini Vaishnaw didn't say when the census would begin when he announced it would include caste information on Wednesday. He said the decision demonstrated New Delhi's commitment to the "values and interests of the society and country."

The count is likely lead to demands to raise the country's quotas that reserve government jobs, college admissions and elected office for some categories of castes, especially for a swathe of lower and intermediate castes recognized as Other Backward Classes. India's current policy caps quotas at 50 per cent, with 27 per cent reserved for OBCs.

Caste is an ancient system of social hierarchy in India and is critical to Indian life and politics. There are hundreds of caste groups based on occupation and economic status across India, particularly among Hindus, but the country has limited or outdated data on how many people belong to them.

Successive Indian governments have resisted updating caste data, arguing it could lead to social unrest. But its supporters say detailed demographic information is necessary to properly implementing India's many social justice programs.

Colonial ruler Britain began an Indian census in 1872 and counted all castes until 1931. However, independent India since 1951 only counted Dalits and Adivasis, who are referred to as scheduled castes and tribes, respectively. Everyone else's caste was marked as general.

The next once-in-a-decade population survey was originally due in 2021, but has been delayed mainly by the COVID-19 pandemic and logistical hurdles.

India recorded its castes for the first time in 80 years in 2011, but the data was not made public as there were concerns about its accuracy.

Some states have taken up surveys

The announcement comes months ahead of a crucial election in India's poorest state of Bihar, where caste is a key issue. Prime Minister Narendra Modi's Bharatiya Janata Party runs a coalition government in Bihar.

The opposition and Modi's partners have pressed the government to count caste in a new census. Modi's Hindu nationalist party has in the past opposed the idea of counting people by caste, saying it would deepen social divisions in the country.

Opposition leader Rahul Gandhi of the Congress Party wrote on X that "It is clear that the pressure we put on the government for Caste Census has worked."

Two Indian states, northern Bihar and southern Karnataka, have already released caste surveys, both showing a higher number of backward castes and prompting demands to raise quotas.

Two southern states, Andhra Pradesh and Telangana, are also planning to undertake similar surveys.

Vaishnaw said including caste details in the national census would improve transparency, while adding that some states ruled by opposition parties have done their own caste surveys for political gain.

The fortunes of many of these political parties, including Modi's BJP, depend on an alliance of castes, particularly those in the OBC category.

On Wednesday, Amit Shah, India's powerful home minister, called the move "historic" and said it "will empower all economically and socially backward sections."