When you open an IPO page, you’ll often see three numbers together: the total issue size in ₹ crore, the category split (Retail/NII/QIB), and the lot size. Retail allocations aren’t always based on the full issue size; what really matters is the net offer, that is, the portion actually up for grabs by public investors after reserved shares are removed.
Once you know the net offer, you can use the retail percentage and the lot size to figure out how many lots are available to retail participants.
An IPO can be made up of:
Together, these form the gross issue size.
Some IPOs also set aside shares for specific groups (examples: employee reservation; sometimes shareholder/policyholder reservation). After such reservations are carved out, the remaining part that goes to the public categories (Retail/NII/QIB) is what investors commonly call the net issue size.
In the RHP, the label you should trust is usually:
You’ll find “Net offer” defined differently on some glossary pages (often as capital issued after promoter allotment). That definition can be fine in a general finance context, but for IPO quota calculation, it can confuse beginners.
For retail quota math, ignore generic glossary wording and use the RHP’s “Net Offer to Public/Net Offer” figure and allocation table.
Retail quota is the portion of the net offer reserved for retail applicants.
In mainboard IPOs, a retail investor can bid at any price within the band or choose a cut-off, and retail is linked to the ₹2 lakh limit (applications above ₹2 lakh fall under non-retail).
1) First, identify the IPO type: book-built or fixed price
This matters because allocation rules differ.
SEBI’s investor education material explains book building and shows how the cut-off price is discovered through bids.
2) Find the net offer base in the RHP
The most important step is locating the Net Offer to Public figure in the RHP: open the RHP and locate the “Issue/Offer Structure” table where Net Offer to Public and category allocation are shown.
3) Apply the category split shown for that IPO
Retail percentage is not something you guess. It depends on the structure used for that issue (and the RHP will show it).
Open the RHP PDF and use Ctrl+F. Search these terms:
You need three inputs:
Regulation-style allocation text for the net offer to the public commonly appears in two book-built structures:
Book-built (common structure)
Book-built (alternate structure)
When an IPO shows retail capped at 10%, it’s not a broker app error; it’s the official allocation structure for that IPO. The company and underwriters decide how many shares go to Retail, QIB, and NII, and this is written in the RHP (Red Herring Prospectus), the official IPO document filed with SEBI. Broker apps simply display the RHP data, so the 10% cap appears the same across all platforms. Some IPOs intentionally limit retail to reduce volatility or focus on institutional investors, which means retail gets a smaller quota and may face lower allotment chances if demand is high. Always check the RHP’s category-wise allocation section to confirm the retail % before applying.
For an issue made other than through book building (fixed price / non-book-built), the allocation text describes:
That’s why some people search “retail quota 50% in IPO” and get mixed answers. The correct answer depends on the IPO method and the allocation table.
If the RHP gives a net offer in shares
Net Offer Shares × (Retail Percentage ÷ 100)
Example: if Retail % = 10%, use 10 / 100 = 0.10
(Lot Size is given in the IPO, e.g., 50 shares per lot)
Tip for estimates: before the final price is known, use the upper price band to estimate net offer shares.
Assume a mainboard book-built IPO has:
1) Net offer to the public
Net offer = 1,200 − 60 − 40
= ₹1,100 crore
2) Convert net offer value into shares
₹1,100 crore = ₹11,000,000,000
Net offer shares = 11,000,000,000 ÷ 500
= 22,000,000 shares
3) Retail quota in shares
Retail shares = 22,000,000 × 35%
= 7,700,000 shares
4) Retail quota in lots
Retail lots = 7,700,000 / 30
≈ 256,666 lots
In practical terms, the retail category can accommodate approximately 2.56 lakh one-lot applications before allotment adjustments. before rounding and final “basis of allotment” adjustments.
Use the retail quota in lots, not the total IPO size.
Basic formula:
Allotment chance = Retail lots available / Valid retail applications
Example:
Suppose an IPO has 1,20,000 retail lots available and receives 6,00,000 valid retail applications.
1,20,000 / 6,00,000 = 20% chance
This means only about 1 out of every 5 retail applicants may get allotment.
A simple way to read it:
Understanding the ₹2 Lakh Retail Investment Limit
If one lot costs ₹15,000 (30 × ₹500), then 13 lots cost ₹1,95,000. That stays under ₹2 lakh; if you cross ₹2 lakh, you won’t be treated as retail.
Even if the IPO has enough retail lots, your application will not be considered if it gets rejected for a technical reason. In that case, your allotment chance becomes 0%.
Common reasons include:
To avoid this, check your PAN, bank balance, UPI mandate status, lot value, and investor category before the IPO closes.
Term | Meaning | What to use it for |
Gross issue size | Fresh issue + OFS | Headline context |
Reserved portion | Employee/shareholder/policyholder buckets (if any) | Explains the reduction in the public pool |
Net Offer to Public (quota base) | Shares/value used for Retail/NII/QIB split | Base for retail quota calculation |
Retail quota | Retail’s share of net offer | Convert to lots to understand allotment |
Item | Mainboard book-built | Mainboard fixed price / non-book-built | SME IPO (revised process) |
Pricing | Price band, discovered by bids | Fixed upfront | Bid-based with special rules |
Retail split | 35% (common) or 10% (alternate) | Retail minimum 50% | “Individual Investor” category |
Cut-off option | Retail can choose a cut-off | Not applicable in the same way | Cut-off not allowed |
Bid changes | Allowed within the process | Allowed within the process | No downward modification/cancellation |
Best for:
Less useful for:
Getting retail quota math right starts with getting the base number right, and that means going to the RHP and finding the Net Offer to Public or Net Offer figure inside the offer structure table, rather than using the gross issue size that makes it into news headlines. From there, the calculation is straightforward: apply the retail percentage the RHP specifies for that particular issue, convert the resulting share count into lots using the lot size, and you have a concrete, usable estimate of retail availability. Using the correct net offer figure helps investors interpret subscription data more accurately and compare IPO demand on a like-for-like basis.
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