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Options Margin
is the collateral your broker requires you to deposit when selling options or using certain strategies, ensuring you can fulfill your obligations if the trade moves against you.
Margin requirements vary by strategy: buying options requires no margin (just the premium), while selling naked options requires substantial margin. Spreads require less margin than naked positions.
Quick answer
Options margin rules: Buying options = no margin, just pay the premium. Covered calls = no additional margin (stock is collateral). Spreads = margin = width of spread x 100. Naked puts = 20% of stock price x 100 (Reg T). Naked calls = 20% + premium (highest margin). Portfolio margin can reduce requirements 50-70% for qualified accounts ($125K+ minimum).
Defined-risk spreads require margin equal to the maximum loss; undefined-risk short options demand far larger, formula-based margin that rises with volatility.
Options Margin Basics
Margin in options trading is the collateral your broker holds to ensure you can meet your obligations. Unlike stock margin (borrowing money to buy shares), options margin is more like a security deposit—it's held against potential losses on short options positions.
The good news: many options strategies require no margin at all. Buying calls, buying puts, and selling covered calls require only the premium or stock value—no additional margin. Margin becomes relevant when you sell naked options or trade complex strategies.
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Margin Requirements by Strategy
No Margin Required
Long calls/puts: Pay the premium, done. Covered calls: Stock serves as collateral. Cash-secured puts: Cash covers assignment. Debit spreads: Max loss is the debit paid.
Defined-Risk Margin (Spreads)
Credit spreads and iron condors: Margin = width of the spread x 100 minus credit received. A $5-wide put spread collecting $1.50 requires $350 margin per contract ($500 - $150).
Naked Options (Highest Margin)
Naked puts: ~20% of stock value minus OTM amount + premium. Naked calls: ~20% of stock value + premium + OTM amount. Naked calls require the most margin because of theoretically unlimited risk.
Reg T vs Portfolio Margin
Reg T: Standard margin, available to all margin accounts. Calculates each position's margin independently. Conservative but straightforward.
Portfolio margin: Risk-based calculation for the whole portfolio. Requires $125K+ balance. Can reduce requirements 50-70%. Best for multi-leg, hedged strategies where positions offset each other's risk. Available at most brokers for experienced traders.
Key Takeaways
- Buying options and covered calls require no additional margin
- Credit spreads margin = spread width minus credit received
- Naked options require the highest margin (20%+ of stock value)
- Use spreads instead of naked options to reduce margin requirements
- Portfolio margin ($125K+) can reduce requirements by 50-70%
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- Written by
- ApexVol Research Team
Quantitative options research. All calculations use live institutional-grade data — the same source professional volatility desks use. - Reviewed by
- Ryan Silk, ApexVol Founder
Reviewed for technical accuracy. 10+ years trading options; built ApexVol's pricing engine, Greeks model and IV-rank methodology.
Revised as market conditions and institutional data change. Last revised 2026-03-01. How we research →
Questions
What people ask
about this.
Do I need a margin account to trade options?
You need a margin account to sell naked options or trade certain strategies. However, you can buy calls and puts, sell covered calls, and trade cash-secured puts in a cash account without margin. Most brokers offer tiered options approval levels, with Level 1-2 available in cash accounts.
How much margin is required for a naked put?
Under Reg T margin rules, naked puts require approximately 20% of the underlying stock value minus the out-of-the-money amount, plus the option premium. For example, selling a naked put on a $100 stock might require $1,500-2,000 in margin. Exact requirements vary by broker.
What is portfolio margin?
Portfolio margin is an advanced margin methodology that calculates requirements based on the overall risk of your portfolio rather than individual positions. It typically requires a $125,000+ account balance and can reduce margin requirements by 50-70% compared to Reg T, making capital much more efficient for multi-leg strategies.
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