One of the most common questions from new iron condor traders is "how much money do I need?" The answer depends on your broker, account type, and the specific trade structure. Here's how margin works for iron condors.

Basic Margin Calculation (Reg T)

Under Regulation T margin (the standard for most retail accounts), the margin requirement for an iron condor is the maximum loss of the wider side.

Since an iron condor has two credit spreads, and only one can be fully in the money at expiration, the broker charges margin on the riskier side (or the wider side if they differ).

Example: Symmetric iron condor

  • Sell $530/$525 put spread (credit $0.90)
  • Sell $570/$575 call spread (credit $0.85)
  • Total credit: $1.75

    • Both spreads are $5 wide. Max loss on either side: $5.00 - $1.75 = $3.25

    Margin requirement: $500 per contract (the width of one spread × 100)

    After the credit is received, your net capital at risk is $500 - $175 = $325 per contract.

    Why Only One Side?

    The stock can only close below $530 OR above $570 at expiration — not both. So only one spread can be fully in the money. Brokers recognize this and only charge margin on one side. This is what makes iron condors capital-efficient compared to selling naked options.

    Asymmetric Iron Condors

    If your spreads have different widths, the broker charges margin based on the wider spread.

    Example:

  • Sell $530/$520 put spread ($10 wide)
  • Sell $570/$575 call spread ($5 wide)

    • Margin requirement: $1,000 per contract (based on the $10-wide put spread)

    This is important to understand: making one side wider increases your margin requirement even if the other side stays narrow.

    Portfolio Margin Accounts

    If your account has $100,000+ (varies by broker), you may qualify for portfolio margin. Portfolio margin calculates requirements based on the actual risk of your combined positions rather than the theoretical maximum per position.

    For iron condors, portfolio margin typically requires 30-60% less capital than Reg T, because the risk model recognizes the defined-risk nature of the position and offsets with other holdings.

    | Account Type | $5-Wide Iron Condor Margin | $10-Wide Iron Condor Margin | Reg T$500$1,000 Portfolio Margin$175-$350$350-$700

    The savings compound across multiple positions. A Reg T trader might run 20 iron condors on $10,000 capital. A portfolio margin trader could run 35-50 with the same capital.

    Account Minimums by Broker

    To trade iron condors, you need Level 3 or Level 4 options approval (varies by broker):

    BrokerMin for SpreadsPortfolio Margin Min Schwab/TDA$2,000$125,000 Fidelity$2,000$100,000 Interactive Brokers$2,000$110,000 RobinhoodNo minimumNot available | Tastytrade | $2,000 | $125,000 |

    Capital Allocation Guidelines

    Regardless of margin requirements, position sizing should be based on total account value, not just available margin:

  • Single iron condor: Risk no more than 3-5% of total account
  • Total iron condor allocation: No more than 25-35% of total account
  • Per underlying: No more than 10% of account in iron condors on one stock

    • Example on a $50,000 account:

  • Max risk per iron condor: $2,500 (5%)
  • Max iron condor allocation: $17,500 (35%)
  • With $5-wide spreads ($500 margin each): max 35 contracts across all positions
  • With $3.25 max loss per contract: max 7 contracts per underlying

    • Common Mistake: Over-Leveraging

    Because iron condors have defined risk, many traders use too much of their available margin. "It's only $300 max loss per contract" they reason, while putting on 50 contracts.

    But $300 × 50 = $15,000 max loss. On a $50,000 account, that's a 30% drawdown in one expiration cycle. Surviving one bad month is possible. Surviving two bad months in a row might be devastating.

    The margin requirement tells you what the broker will allow. Position sizing tells you what's prudent. They're not the same number, and the second one matters more for long-term survival.