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Retail IPO allotment in India uses a lottery when oversubscribed — not first-come-first-served. Learn category rules, timeline, cut-off price, worked odds, and why most applicants get zero shares.
Estimate odds when retail is oversubscribed: lots available ÷ applications. Illustrative only — actual lottery uses registrar draw.
Approx. chance
12.5%
Retail oversubscription
8.0×
Rough odds
1 in 8
# How IPO Allotment Works: The Lottery System Explained
When a popular IPO opens in India, lakhs of retail investors apply — and most receive zero shares. That is not a bug in your broker app; it is how SEBI-mandated category quotas and lottery-based retail allotment work when demand exceeds supply.
Rahul (Pune, retail investor) applied for one lot of a hyped IPO at cut-off price via UPI ASBA. The issue was 42× oversubscribed in the retail category. He got no shares and a refund in five days. Meera (Chennai, same IPO) applied once, same lot size — she received one lot. Same process, different lottery outcome. This guide explains why, the timeline, and how to estimate your allotment odds — without loan jargon or generic investing filler.
*Sources: SEBI ICDR Regulations, NSE/BSE IPO process circulars, registrar basis-of-allotment filings (Link Intime, KFin Technologies). Rules evolve — verify on the exchange and company RHP before applying.*
Every mainboard IPO splits reserved shares across three buckets. Retail, Non-Institutional (NII/HNI), and Qualified Institutional Buyers (QIB) follow different allotment mechanics.
| Category | Who applies | Typical reservation | Allotment method when oversubscribed |
|---|---|---|---|
| Retail Individual Investors (RII) | Individuals investing ≤ ₹2 lakh per IPO | ~35% of offer (minimum per SEBI norms) | Lottery when oversubscribed — often one lot or zero per successful applicant |
| Non-Institutional (NII / HNI) | Individuals investing > ₹2 lakh; corporates below QIB threshold | ~15% | Proportionate — partial allotment by application size |
| QIB | Mutual funds, FPIs, banks, insurers | ~50% | Book building / firm allotment per institutional bid |
Application limit vs allotment outcome (do not confuse the two):
| What it means | |
|---|---|
| What you may apply for | Within the retail cap (typically up to ₹2 lakh per IPO per PAN), you can bid for one or more lots — whatever quantity fits the cap and the IPO’s lot size. |
| What you often receive when retail is oversubscribed | The basis of allotment usually tries to maximise the number of successful applicants. In heavily oversubscribed issues that often means a lottery for one minimum lot — winners get one lot, losers get zero (not a half lot), even if they applied for several lots. |
So applying for more lots is allowed; it does not mean you are entitled to multiple lots when demand far exceeds supply. Always read that IPO’s Basis of Allotment for the exact draw method.
Compare with HNI: a ₹5 lakh application may receive proportionate shares — e.g. ~18% of applied quantity if the category is 5.5× oversubscribed.
When retail applications exceed available retail shares, the registrar runs a lottery — not first-come-first-served.
``` Total IPO shares offered │ ▼ Retail quota (~35% of offer) │ ▼ Convert to number of retail lots (÷ lot size) │ ▼ Count valid retail applications (within ₹2 lakh cap; may be 1+ lots each) │ ▼ Oversubscribed? ──No──► Applicants typically get the lots they applied for │ Yes │ ▼ Basis of allotment (often lottery) ──► Many issues: 1 min. lot or 0 ```
Key insight: You may apply for multiple lots within the retail cap. In a hot oversubscribed IPO, allotment still often lands as one lot or nothing to spread shares across more investors. Day 1 vs day 5 and UPI vs net banking do not change the draw — only a valid application (correct demat + successful ASBA/UPI block) enters allotment.
Search queries like *"IPO allotment date"* and *"when will refund come"* map to this fixed sequence. Dates are announced in the RHP and on NSE/BSE IPO pages.
| Stage | What happens | Typical timing (T = issue close day) |
|---|---|---|
| IPO opens | Bids accepted via ASBA (bank/UPI) | Day 0 (3–5 day window) |
| IPO closes | Last day to apply; no new bids | T |
| Registrar finalises basis of allotment | Lottery + proportionate math published | T+1 to T+3 working days |
| Allotment status | Check on registrar / broker app | Often T+3 to T+5 |
| Refund of unallotted amount | ASBA unblock / credit | T+3 to T+7 |
| Shares credited to demat | Allotted qty visible | Before listing |
| Listing on NSE/BSE | Trading begins | Usually T+6 to T+8 |
``` IPO Opens ──► IPO Closes ──► Basis of Allotment ──► Refund ──► Demat Credit ──► Listing (3–5 days) T T+1 to T+3 T+3–7 pre-listing T+6–8 ```
Track dates on the NSE IPO section or BSE equivalent for the specific company.
Numbers are illustrative — use the Basis of Allotment document for actual figures after each IPO.
| Input | Value |
|---|---|
| Total IPO size | 10,000,000 shares |
| Retail reservation (35%) | 3,500,000 shares |
| Lot size | 35 shares |
| Retail lots available | 3,500,000 ÷ 35 = 100,000 lots |
| Valid retail applications | 800,000 |
| Retail oversubscription | 800,000 ÷ 100,000 = 8× |
Approximate chance of winning one lot:
``` Probability ≈ Retail lots available ÷ Valid retail applications ≈ 100,000 ÷ 800,000 ≈ 12.5% ```
So roughly 1 in 8 retail applicants get a lot in this scenario. Popular IPOs at 50×–200× retail oversubscription can push odds below 1%.
Use the IPO Allotment Probability tool on this page to model different subscription levels.
You bid at a price within the band (e.g. ₹420–₹440) or choose cut-off (accept final issue price).
| Bid type | Allotment impact |
|---|---|
| Cut-off | Eligible for allotment at final price; recommended for retail lottery eligibility |
| Fixed price below final | Application may be rejected or ineligible if final price is higher |
| Multiple price bids (same account) | Only one valid application per PAN — duplicate bids invalid |
Cut-off price is the final issue price determined after book building (QIB/NII) and disclosed before allotment. Retail investors applying at cut-off are treated as accepting that price.
| Topic | Correct understanding |
|---|---|
| ASBA | Application Supported by Blocked Amount — money blocked in bank, not debited until allotment |
| UPI ASBA | Same lottery rules as net-banking ASBA; convenience only |
| Multiple applications same PAN | Invalid — only one application per PAN across brokers |
| Family members | Separate PAN = separate lottery tickets (each person's own demat + bank) |
| Two demat accounts, one PAN | Still one retail application per IPO per PAN |
| Missing demat mismatch | Application rejected — no lottery entry |
1. Retail category oversubscribed — most common; lottery loss. 2. Invalid bid — below cut-off, duplicate PAN, wrong category (HNI vs retail). 3. Technical rejection — demat not linked, UPI mandate failed, insufficient block. 4. Not applying at all — anchor/QIB do not use retail lottery; that is a different bucket.
Refund: Unallotted amounts are unblocked via ASBA — typically within a week of allotment. Check registrar email/SMS and your bank statement.
Allotted shares credit to your demat before listing. On listing day, price may open above or below issue price — no guarantee of listing gains.
For tax on sale, holding period matters — see Stock Market Taxation Guide and use the Capital Gains Tax Calculator. For whether to apply at all, read IPO Investing Guide India and Stock Market Basics.
| Step | Action | Why it matters |
|---|---|---|
| 1 | Open / verify demat + trading + bank KYC | Invalid demat = rejected application (no lottery entry) |
| 2 | Note IPO open, close, and allotment dates | Missed close = no bid; missed UPI mandate = invalid |
| 3 | Apply at cut-off within the retail ₹2 lakh cap (1+ lots allowed) | Keeps bid eligible; oversubscribed allotment often still yields 0 or 1 lot |
| 4 | Approve UPI mandate / ASBA block before deadline | Funds must stay blocked until allotment |
| 5 | Check allotment status on registrar / broker | Confirms lot win vs refund |
| 6 | Review listing — hold or sell with a plan | Listing gains are not guaranteed |
Do not open a second application under the same PAN, chase grey-market premium as a strategy, or treat IPO lottery tickets as a substitute for diversified equity. For the full apply-to-listing playbook, see IPO Investing Guide India. For demat setup, see Demat Account Opening Guide.
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*Reviewed against SEBI ICDR retail allotment framework (2023 amendment cycle). Not investment advice. IPO outcomes are uncertain; apply only with money you can afford to block for 7–10 days.*