India · Citizenship

Naturalization rules: required residence years, language and civics requirements, and each country's dual-citizenship policy.

Start from the official sources below — they are the authoritative reference for this topic.

Government portals

National Portal of India — Directory of central and state government services and departments.
Income Tax Department — PAN application, e-filing of returns, and residency rules for foreigners.
GST Portal — GST registration, return filing and the taxpayer search.
Indian Visa Online — The official e-Visa application, regular visa forms and application status.