How to Choose Iron Condor Strikes

Strike selection is the most consequential decision when setting up an iron condor. The strikes you choose determine your probability of profit, how much credit you collect, your maximum loss, and how much room the market has to move before you're in trouble. The most systematic method is delta targeting: use delta as a probability proxy, and target 0.10–0.15 delta on the short strikes.

Tradematic is an automated iron condor trading platform that uses a systematic, delta-targeted approach to strike selection for SPX iron condors — removing discretion and ensuring consistent setup parameters across every trade.

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The Two Decisions in Strike Selection

Every iron condor requires four strikes: a short put, a long put, a short call, and a long call. Strike selection involves two decisions:

1. Where to place the short strikes — the options you sell, which define your profit zone
2. How wide to make the spreads — the distance between short and long strikes, which defines your maximum loss

These decisions are independent but interact: wider spreads collect more credit but risk more capital; narrower spreads limit both credit and maximum loss.

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Short Strike Selection: The Delta Approach

The most systematic method for choosing short strikes uses delta as a probability proxy.

Delta ≈ Probability that the option expires in the money

A 0.15 delta short strike has approximately an 85% probability of expiring out of the money (worthless). A 0.10 delta short strike has approximately a 90% probability of expiring OTM.

Standard Short Strike Ranges

Tradematic's approach: Short strikes at approximately 0.10–0.15 delta on both sides, targeting the 85–90% probability range. This is applied symmetrically — the put side and call side use the same delta target.

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Long Strike Selection: Spread Width

Once short strikes are placed, the long strikes define the spread width. Common approaches:

Fixed-Width Spreads

Place long strikes a fixed number of points from the short strikes (e.g., 50 points wide on SPX). This produces consistent maximum loss per contract regardless of where strikes fall.

Example on SPX at 5,500:

• Short put: 5,300 (0.15 delta)
• Long put: 5,250 (50-point spread)
• Short call: 5,700 (0.15 delta)
• Long call: 5,750 (50-point spread)

Delta-Defined Long Strikes

Place long strikes at a specific delta (e.g., 0.05 delta). This adapts spread width to current volatility — in high-IV environments, spreads naturally widen.

Practical Considerations

• Minimum spread width: On SPX, spreads narrower than 25 points collect minimal credit relative to commission cost
• Maximum spread width: Wider than 100 points increases max loss substantially; appropriate only for larger accounts with deliberate sizing
• Standard SPX width: 25–75 points per side is most common for systematic strategies

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How Volatility Affects Strike Placement

In high-IV environments, the same delta strikes are farther from the current price — the market is pricing in larger expected moves. This creates more room to the strikes with higher credit collected:

This is why iron condors are more attractive in higher-IV environments — delta-targeted strikes naturally provide more buffer while collecting more premium.

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Symmetric vs. Asymmetric Strike Placement

Symmetric placement (same delta on both sides) is the most common approach for systematic strategies:

• Simple to implement and backtest
• No directional bias embedded in the structure
• Probability balanced on both sides

Asymmetric placement adjusts one side based on market conditions:

• Put side closer in (higher delta) when bullish bias expected
• Call side closer in (higher delta) when bearish bias expected
• Or adjusting to account for skew (puts typically have higher IV than calls on indices)

For systematic automation, symmetric placement removes discretionary judgment. Tradematic uses a consistent delta target on both sides to ensure each trade is set up by the same rules.

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Strike Selection and Probability of Profit

The full iron condor's probability of maximum profit at expiration is approximately:

P(max profit) ≈ (1 − delta_short_put) × (1 − delta_short_call)

For 0.15 delta short strikes on both sides:

• P(max profit) ≈ 0.85 × 0.85 ≈ 72%

For 0.10 delta short strikes on both sides:

• P(max profit) ≈ 0.90 × 0.90 ≈ 81%

This is the probability of the full condor expiring worthless with both sides OTM simultaneously. In practice, most positions are closed before expiration at profit targets rather than held to expiration.

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Common Strike Selection Mistakes

Chasing yield by moving strikes too close Moving short strikes to 0.20–0.25 delta to collect more credit dramatically reduces probability. A 0.20 delta short strike has only 80% probability OTM — when two sides are combined, overall probability drops to ~64%.

Ignoring liquidity On individual stocks, some strikes have very wide bid-ask spreads. On SPX, liquidity is generally excellent across all strikes. Choose strikes with tight bid-ask spreads to avoid significant slippage.

Setting up around round numbers only Traders often want strikes at round numbers (5,300, 5,400). Use delta as the guide, not round numbers — the market doesn't care where you prefer your strikes to be.

Not adjusting for volatility conditions Using fixed price distances (e.g., always 200 points OTM) instead of delta-based targeting means you get very different probability profiles in different volatility environments.

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Frequently Asked Questions

Should the put side and call side be equally far from the current price? Not necessarily — implied volatility skew means puts typically trade at higher IV than calls on indices like SPX. A pure delta target produces asymmetric distance (the put strike will often be farther away than the call strike) because it accounts for this skew naturally.

What delta should I target for iron condor short strikes? 0.10–0.15 delta is the most common range for systematic strategies: high enough probability to be advantageous, close enough to collect meaningful credit. Below 0.10 delta, credit becomes too small to justify the trade. Above 0.20 delta, probability drops meaningfully.

How does DTE affect strike selection? At longer DTE (45–60 days), the same delta strikes are farther from the current price in absolute points. At shorter DTE, they're closer. This is why DTE and delta targeting work together — delta already adjusts for the time dimension.

Can I use the same strike selection approach on other indexes? Yes — delta-based strike selection applies to any liquid options market (SPY, QQQ, RUT). The mechanics are identical; the specific distances and credits will differ by underlying and volatility level.

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Conclusion

Delta-targeted strikes at 0.10–0.15 give you a structural edge at entry: the market is pricing an 85–90% probability of expiring worthless. That doesn't guarantee the trade works. But it means you're not guessing about where to put the strikes — the probability framework makes the decision for you, and it adapts automatically as volatility changes.

The CBOE's SPX options product specification pages document SPX options mechanics and expiration conventions that directly affect how strikes are selected and managed.

Start your 7-day free trial and see how Tradematic applies systematic strike selection to every iron condor entry.

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Trading involves risk and losses can occur. Past performance does not guarantee future results. Options trading is not suitable for all investors. Only allocate capital you are comfortable risking.