| Application Portal Opens | March 10, 2025 |
| Application Portal Closes | April 15, 2025 |
| Corrections in Application Forms | 10:00 AM, April 21, 2025 - 5:00 PM, April 22, 2025 |
| Release of Hall Tickets | 3:00 PM, May 15, 2025 |
| IISER Aptitude Test (IAT) 2025 | 9:00 AM to 12:00 Noon, May 25, 2025 |
| Answer Key Display | May 25, 2025 (after the IAT 2025) |
| Candidate Response form upload & Portal opens for filing Objections | 5:00 PM, May 29, 2025 |
| Portal closes for filing Objections | 5:00 PM, June 01, 2025 |
| Selective Information/Document Upload in Application Form | 10:00 AM, June 01, 2025 - 5:00 PM, June 23, 2025 |
| Release of Final Answer Key | June 24, 2025 |
| Declaration of IAT 2025 Result | June 24, 2025 |
| Registration for Counselling Process (filling up of IISER Academic Programme Preference Form) | 5:00 PM, June 26, 2025 - 5:00 PM, July 07, 2025 |
Schedule of Counselling/Admission Offers for IISER Admissions 2025
| Round 01 | 5:00 PM, July 21, 2025 - 5:00 PM, July 26, 2025 |
| Round 02 | 5:00 PM, August 01, 2025 - 5:00 PM, August 05, 2025 |
| Round 03 | 5:00 PM, August 08, 2025 - 5:00 PM, August 12, 2025 |
| Round 04 | 5:00 PM, August 18, 2025 - 5:00 PM, August 21, 2025 |
| Round 05 | 5:00 PM, August 25, 2025 - 5:00 PM, August 27, 2025 |
| Round 06 | 5:00 PM, August 31, 2025 - 5:00 PM, September 02, 2025 |
| Round 07 | 5:00 PM, September 06, 2025 - 5:00 PM, September 08, 2025 |
| Round 08 | 5:00 PM, September 11, 2025 - 5:00 PM, September 13, 2025 |
| Round 09 | 5:00 PM, September 15, 2025 - 5:00 PM, September 17, 2025 |