Calculate the IPO bidding window, days to listing and refund initiation date from the open, close and listing dates of any Indian IPO.
SEBI's T+3 rule: shares list within 3 working days of the issue closeBidding window = close date − open date (in days)Refunds / ASBA unblocking typically by the 2nd working day after closeDays to listing = listing date − close date when providedUnder SEBI's T+3 rule (mandatory since December 2023), the IPO listing date is simple arithmetic: shares list on the 3rd working day after close, refunds and ASBA unblocking land around T+2, and the basis finalises near T+1. Enter open, close and listing dates and this tool maps the whole window.
IPO refund time and UPI mandate expiry queries come from the same anxiety: your money stays blocked from bidding till allotment or refund, and UPI mandates debit only on allotment, while unallotted bids simply expire unblocked. Working days mean Monday to Friday minus exchange holidays.
Delays are rare now, but if schedules slip, track registrar announcements and keep the mandate active. For allotment probability in that window, see the Allotment Odds calculator.
Failed / unallotted applications are unblocked roughly by the 2nd working day after the issue closes under the T+3 timeline.
Shares list on the 3rd working day after the issue closes (T+3), a SEBI rule mandatory since December 2023.
Monday to Friday excluding stock-exchange holidays. Weekends and exchange-declared holidays stretch the calendar dates.
Delays are rare under T+3. If the schedule slips, your ASBA amount stays blocked until allotment or refund — track the registrar's announcements.
Only if you get allotment. Unallotted applicants never get debited; the mandate simply expires and the block is released.
The mandate remains active from bidding until allotment finalisation or unblocking, after which it auto-expires.
Last updated: 14 Oct 2026, 01:27 IST