Introductory Context
"The naked put selling strategy has been and continues to be one of the most commonly used professional income strategies precisely because it is highly capital-efficient: SPAN margin requirements are typically 10 to 20 percent of the total obligation rather than 100 percent. This capital efficiency allows sellers to deploy the same cash across multiple positions or hold the remaining cash for other opportunities. However, this capital efficiency also means the naked put's risk management relies entirely on the seller's discipline (stop-losses, position sizing, event avoidance) rather than on the structural protection of full cash collateralization. "
SPAN Margin for Naked Put Selling in India
NSE's SPAN (Standard Portfolio Analysis of Risk) margin system calculates the margin required for a naked short put based on the option's value at risk -- the maximum expected one-session loss under standard stress scenarios. For a Nifty naked put with strike 23,000 (when Nifty is at 23,500): the SPAN margin calculation considers the option's delta (approximately -0.25), the Nifty's expected one-day move (based on VIX), and the position's sensitivity to these moves. Typical SPAN margin for this specific position: approximately Rs 70,000 to Rs 1,20,000 per lot, depending on VIX and Nifty's level.
Compare to the cash-secured equivalent: the full put obligation = Rs 23,000 x 75 = Rs 17,25,000. SPAN margin of Rs 90,000 = 5.2 percent of the full obligation. This is the capital efficiency of the naked put: Rs 90,000 of margin controls a Rs 17,25,000 notional position. For the same Rs 90,000 of capital, the naked put seller can control far more notional exposure than the cash-secured put seller (who must hold the full Rs 17,25,000).
The Risk Profile of Naked Put Selling
The naked put's risk profile is straightforwardly dangerous if not managed: the premium received (Rs 48 per unit for a 23,000 PE when Nifty is at 23,500) is the maximum income. The maximum loss is theoretically Rs 22,952 per unit (the strike price Rs 23,000 minus the premium Rs 48 -- as Nifty falls toward zero, the put seller's obligation grows proportionally). Per lot: Rs 22,952 x 75 = Rs 17,21,400 theoretical maximum loss.
In practice, Nifty does not fall to zero -- but large drawdowns are realistic. In the March 2020 COVID crash, Nifty fell from approximately 11,000 to 7,511 in three weeks -- a 31.7 percent decline. A naked put seller at 9,000 (a reasonable 18 percent OTM strike for a monthly position at the start of February 2020) would have faced a loss of approximately (Rs 9,000 - Rs 7,511 - Rs 60 premium) x 75 = Rs 1,429 x 75 = Rs 1,07,175 per lot. This loss of Rs 1,07,175 on an investment that generated perhaps Rs 4,500 of premium income per month represents 24 months of income destroyed in one position. This is the tail risk of naked put selling -- manageable with stop-losses but catastrophic without them.
Naked Put Margin and Risk Summary
Position: sell Nifty 23,000 PE when Nifty at 23,500. Premium received: Rs 48 per unit = Rs 3,600 per lot. SPAN margin required: approximately Rs 90,000 per lot. Full obligation: Rs 17,25,000 per lot. Capital efficiency: 19x (Rs 90,000 controls Rs 17,25,000 exposure). Return on margin: Rs 3,600 / Rs 90,000 = 4.0 percent per monthly cycle (annualised 48 percent). Maximum loss (theoretical): Rs 17,21,400 per lot. Maximum loss with stop at 2x premium: Rs 7,200 per lot. With stop: max loss is manageable. Without stop: catastrophic.
The Stop-Loss for Naked Puts
The naked put's stop-loss follows the double-premium rule from Topic 14.13's short straddle management: close the position when the put's current premium equals 2x the original premium received. For the 23,000 PE sold at Rs 48: close when the 23,000 PE trades at Rs 96. At this point: the put has doubled in value, Nifty has fallen significantly (approximately 300 to 400 points), and the position is showing a loss of approximately Rs 48 per unit (the 2x premium paid back less the Rs 48 original income = Rs 48 net loss). Per lot: Rs 3,600 maximum stop-loss loss. This disciplined stop converts the theoretically catastrophic naked put into a defined-risk position with a manageable Rs 3,600 maximum loss per lot -- roughly comparable to the iron condor's maximum loss structure.
When Naked Put Selling Is Appropriate vs Cash-Secured
For capital deployment: naked put selling is more capital-efficient (uses SPAN margin vs full cash). For risk management: cash-secured put is more conservative (no margin calls possible if the stock declines, as the full cash is already held). For income yield: naked put selling generates the same absolute income (same premium) at a fraction of the capital commitment, producing a higher return on capital employed. For stock acquisition intent: cash-secured put is structurally more appropriate -- the cash is committed to the purchase and the assignment is the intended outcome. For pure income without stock acquisition intent: naked put (with strict stop-loss) is more capital-efficient.
The naked put is not an inherently irresponsible strategy -- it is a capital-efficient income strategy that requires the discipline the cash-secured put's structural constraints provide automatically. The naked put seller who applies the double-premium stop-loss every trade, avoids event weeks, and respects the 2 percent position sizing rule on the stop-loss amount (not the full margin) achieves the same risk management outcome as the cash-secured put seller, with 5 to 10 times the capital efficiency.
SEBI's Peak Margin Rules Affect Naked Put Margin Intraday
SEBI's peak margin rules (effective October 2021, updated periodically) require brokers to collect margin at the peak intraday margin level rather than only the end-of-day margin. This means a naked put that requires Rs 90,000 of SPAN margin at market open might require Rs 1,20,000 or more at the intraday peak if Nifty falls significantly during the session -- creating an intraday margin call even if the position is profitable at the session's end. Always hold at least 150 percent of the SPAN margin displayed at entry as available balance, to accommodate intraday peak margin requirements without margin call disruption.