You haven't mentioned the IIT you are enquiring about. Every IIT has its own fee structure and you can chekc them at: https://engineering.careers360.com/articles/iits-btech-fee-structure . In general the fees varies from 8 lakhs to 10 lakhs and above for the entire duration of the course.Now there is Academic Fees and Accommodation and Mess charges. The fee is different for all IITs. There will be scholarships provided to meritorious students and also financial aid is available for Candidates who require one. You can apply for Educational loans.