Three numbers decide the rupees an IPO application will freeze. The price band is the range in which the issue price will be discovered. The lot size is the minimum number of shares, and you can apply only in whole lots. The cut-off option, for investors who are allowed to use it, means you accept whatever price inside the band the book discovers. Get those three wrong and the application either blocks more cash than you planned or never enters allotment.
The band is deliberately narrow
In a book-built issue the company and the lead managers publish a floor and a cap before bidding opens. The cap is not allowed to be more than 20% above the floor. A band of ₹200–₹240 is the widest shape the rule permits at that floor, because 240 is 120% of 200. A band of ₹200–₹210 is a narrower argument: the sellers are less willing to discover a low price, or demand is expected at the top. You learn something from the width. You do not learn whether ₹210 is cheap relative to earnings. That is the basis-for-issue-price section of the prospectus, walked through in how to read a DRHP.
The discovered issue price is a single number inside the band, produced from the demand in the book. When an issue is heavily bid at the top, the price usually is the cap. When demand is weak, the price can be the floor, or the issue can struggle to collect the minimum subscription at all. The band is the menu. Subscription tells you which item on the menu people ordered. It does not reprint the menu.
Lot size is a packet, not a suggestion
Shares are allotted in lots. If the lot is 70, you apply for 70, 140, 210, and so on, up to the limit of your category. You cannot apply for 10 shares because you wanted a round rupee amount. The company sets the lot so that one lot lands on a sensible minimum ticket. On the main board that ticket is sized for retail. On SME platforms the ticket is larger. Multiply before you apply: lot times the price you will be blocked for.
At cut-off, the block uses the cap, not the floor and not the midpoint. The bank has to be able to pay the dearest price in the band. Illustration: floor ₹95, cap ₹100, lot 150. One lot at cut-off blocks ₹15,000. If the discovered price is ₹95, and you are allotted, the debit is 150 × ₹95 = ₹14,250 and the extra block is released. If you are not allotted, the whole ₹15,000 block goes. People who budget “about ₹14,000” and then cannot approve a ₹15,000 mandate have not been rejected by the company. They have misread the block.
Who may tick cut-off
Retail individual investors can bid at cut-off in a book-built issue. Employees bidding in an employee reservation generally can as well, on the terms of that issue. Qualified institutional buyers cannot. Non-institutional investors bidding above the retail limit cannot. They name a price. If the discovered price is higher than the price they named, their bid does not get shares.
That rule is the entire content of the cut-off checkbox for a retail reader. Cut-off means “I will pay up to the cap, and I want to remain eligible if the price is set at the cap”. A specific retail bid of ₹96 in a ₹95–₹100 band is a statement that you do not want the shares at ₹97, ₹98, ₹99, or ₹100. If the book sets ₹100, you are out, even if your UPI mandate was perfect. Unless you have a price discipline you are willing to lose the allotment over, retail bidders use cut-off. The checkbox is not a demand boost and it does not improve lottery odds. It only keeps you eligible across the band.
Retail ceiling and lot maths
Retail applications stop at ₹2 lakh. If one lot at the cap already costs ₹14,000, you can apply for multiple lots until the next lot would cross ₹2 lakh. Work it out before you type a large number into the broker screen. Crossing the ceiling in the retail category is a rejected or reclassified application, not a clever way into the NII book. The NII book is a different category with a different allotment method, described in how allotment works.
SME minimums can sit near or above amounts that feel “institutional” to a household even when the form is still an individual application. Do the multiplication from the prospectus, not from memory of a mainboard issue you applied for last month.
Discount conversations
Some issues offer a discount to retail or employee bidders off the issue price. The discount is in the prospectus, in rupees per share, and it changes the debit after allotment. It does not change the fact that the initial block may still reference the band. Read the payment terms rather than a social-media summary of the discount. A ₹10 discount on a ₹200 share is 5%. It is real. It is not a reason to skip the risk factors.
Where these numbers sit on IPOWATCH
Every IPO card shows the band and the lot. The detail page repeats them next to GMP and dates. GMP is added to the cap when we show an estimated listing price, because that is the price retail cut-off bidders are underwriting. If you want the block amount, ignore GMP and multiply lot by cap. If you want the mood, look at GMP afterwards, with what GMP is in mind. The application itself happens at your broker, in the window, with a mandate you approve yourself. How to apply is that sequence. Nothing on the price band is advice that the cap is a fair value.