Introductory Context
"Strike selection for the iron condor synthesises the individual spread strike selection frameworks from Module 13 (for the bull put spread's inner and outer put strikes, and the bear call spread's inner and outer call strikes) into a unified four-decision process. The iron condor adds one dimension that the individual spreads do not have: the width symmetry decision -- whether the put wing and call wing should be equal in width (symmetric condor) or different (asymmetric condor) -- which is determined by the directional bias within the neutral view and by the volatility skew. "
Decision 1 - The Inner Short Put Strike
The inner short put strike defines the lower boundary of the profit zone. Selection criteria: (a) OI alignment: place at or near the highest put OI level in the current expiry's option chain. The highest put OI represents institutional support -- sellers who are defending this level. (b) Technical support: confirm the inner short put coincides with a technical support level on the daily or weekly chart (prior high, round number, major EMA). (c) OTM distance: typically 3 to 5 percent below the current underlying for monthly expiry. For Nifty at 23,500: 3 percent OTM = 22,795 (approximately 22,800), 5 percent OTM = 22,325 (approximately 22,300). Select the level that best matches both the OI peak and the technical support.
Decision 2 - The Inner Short Call Strike
The inner short call strike defines the upper boundary of the profit zone. Selection criteria mirror the short put: (a) OI alignment at the highest call OI level (institutional resistance). (b) Technical resistance at a prior high, round number, or major EMA from above. (c) OTM distance: 3 to 5 percent above the current underlying. For Nifty at 23,500: 3 percent OTM = 24,205 (approximately 24,200), 5 percent OTM = 24,675 (approximately 24,700). The call wing's inner strike is typically placed at the resistance level rather than mechanically at a fixed OTM percentage, because resistance levels are where the call sellers are concentrated and where the market is most likely to be repelled.
Decision 3 - The Wing Width (Outer Strike Placement)
The wing width -- the distance between the inner short strike and the outer long strike -- determines the maximum loss per side and the premium paid for the long protective option. Standard wing widths for Nifty: 300 to 500 points. Narrower wings (200 to 300 points) cost more to buy protection but generate a higher net credit (the short option's full premium is retained while less is paid for the closer long option). However, narrower wings also produce smaller maximum losses -- which may allow more lots within the 2 percent position sizing limit. Wider wings (500 to 700 points) cost less to buy protection (the further-OTM long option is cheaper) but produce a smaller net credit (more of the short premium is consumed by the long option cost). The trade-off: narrower wings = more income, less maximum loss per unit. Wider wings = less income, larger maximum loss per unit.
Standard practice: use equal wing widths on both sides (symmetric condor) of 300 to 500 points, with the specific width chosen to produce a net credit yield of at least 15 to 20 percent of the wing width (the credit yield minimum from Module 13). Example check: inner short put at 22,800, outer long put at 22,300 (500-point put wing). Short put credit Rs 48. Long put cost Rs 22. Put wing net credit Rs 26. Wing width Rs 500. Credit yield = Rs 26 / Rs 474 = 5.5 percent. Below the 15 to 20 percent minimum. Adjust: narrow the wing to 300 points (outer long put at 22,500). Long put at 22,500 costs Rs 36. Put wing net credit = Rs 48 - Rs 36 = Rs 12. Credit yield = Rs 12 / Rs 288 = 4.2 percent. Still below minimum. This illustrates the difficulty of achieving the credit yield minimum on individual wings for wider OTM strikes in normal VIX environments.
The Credit Yield Threshold Applied to the Full Iron Condor
For iron condors, the credit yield is typically evaluated on the total net credit relative to the total maximum loss (not on individual wings). Total net credit Rs 53 per unit / total maximum loss per side Rs 447 per unit = 11.9 percent. This is the iron condor's combined credit yield. The 10 to 15 percent minimum for the combined position (slightly lower than the 15 to 20 percent minimum for individual spreads) reflects the iron condor's dual-wing structure -- both wings contribute to income, making a slightly lower per-wing yield still produce acceptable total income relative to the maximum risk.
Decision 4 - Symmetric vs Asymmetric Condor
A symmetric condor uses equal wing widths and equal OTM distances on both sides. This is the default for most retail iron condor implementations: equal width on both sides produces a position that is directionally neutral (equal loss from a move of equivalent magnitude in either direction) and easier to manage (same stop rules apply to both wings). An asymmetric condor uses different wing widths or OTM distances on each side. The asymmetric condor is appropriate when: the directional view is slightly biased (slightly bullish: wider put wing, narrower call wing; slightly bearish: wider call wing, narrower put wing), or the volatility skew makes the put side more cost-efficient than the call side (justifying a wider put wing for the same credit cost). For retail traders: symmetric is the standard; asymmetric is for advanced practitioners.
Iron Condor Strike Selection Summary
Inner short put: highest put OI level + technical support, 3-5% OTM. Inner short call: highest call OI level + technical resistance, 3-5% OTM. Wing width: 300-500 points per wing. Net credit yield target: 10-15% of wing width x lot size. Symmetric vs asymmetric: symmetric (equal width both sides) as default. Combined credit yield check: net credit / maximum loss per side > 10%. All four strikes must be confirmed against the current option chain's actual premiums before entry.
The OI Alignment Practical Process
For every iron condor entry, the OI alignment check is done on the NSE option chain (available on NSE's website, Sensibull, or the broker's option chain view). Open the current monthly option chain. Identify: (1) The strike with the highest call OI (potential short call inner strike). (2) The strike with the highest put OI (potential short put inner strike). Verify: are these strikes at technically meaningful resistance and support levels? If the highest call OI is at 24,000 and the prior resistance is also at 24,000: strong alignment. If the highest call OI is at 24,500 but the technical resistance is at 24,000: a discrepancy -- use 24,000 as the inner strike (technical analysis takes priority when OI and technical analysis diverge by 200 to 500 points).
Strike selection for the iron condor is simultaneously the income determination decision and the risk determination decision. Higher strikes closer to ATM: more income, smaller profit zone, more frequent stops. Lower strikes further from ATM: less income, wider profit zone, less frequent stops. The optimal point on this spectrum is where the credit yield meets the minimum while the profit zone width provides sufficient room for the expected underlying movement in the holding period.
Check the Option Chain Liquidity for All Four Strikes Before Entry
All four legs of the iron condor must be liquid enough for efficient entry and exit. Check the bid-ask spread for each of the four options before committing to the position. If the outer long put or long call has a very wide bid-ask spread (Rs 5 to Rs 10 on a Rs 20 to Rs 22 option), the effective cost of the long protective option is significantly higher than the mid-price. Calculate the net credit using the actual bid (for sold options) and ask (for bought options), not mid-prices. On the outer long strikes, paying the full ask for less-liquid OTM options reduces the net credit and may push the credit yield below the minimum threshold.