A covered strangle is long 100 shares plus a short call above the price and a short cash secured put below the price. You collect two premiums instead of one. The price for that extra income: you have to be okay with two specific outcomes at expiration. Shares called away at the call strike, or another 100 shares assigned at the put strike.
Done right, this is income on top of a long term position. Done wrong, it is a leveraged long that bites hard when the stock crashes.
Example on a $100 stock:
Stock between $90 and $110 at expiration. Both options expire worthless. You keep the $300 in premium and your shares. Repeat next cycle.
Stock above $110 at expiration. Call assigned. Your shares get sold at $110. The put expires worthless. You walk away with the share gain plus $300 in premium.
Stock below $90 at expiration. Put assigned. You buy 100 more shares at $90. The call expires worthless. Now you own 200 shares. Your cost basis is averaged: $100 plus $90 minus the $300 premium received, divided across the shares.
The downside. If the stock crashes from $100 to $60, you lose on your original 100 shares ($4,000), and you get assigned at $90 for more shares now worth $60 ($3,000 additional loss), partly offset by $300 premium collected. Net loss: $6,700. Not a small number.
Position size assuming the worst case can happen. The premium feels nice but it is a small fraction of the total downside exposure.
On stocks you already hold long term and want to keep building. Stocks with elevated implied volatility (richer premium). Sideways or slowly trending markets where the legs are unlikely to get tested hard.
NOT on crash candidates. NOT before earnings or major events. NOT on stocks you would not want to own more of.
Take profit at 50 to 75% of total premium collected. Close both legs as a package or leave the untested leg open if you want.
If the stock approaches the call strike, decide: let it get called away (planned exit) or roll the call up and out for more credit (keep the shares).
If the stock approaches the put strike, decide: let assignment happen (planned add) or roll the put down and out (avoid assignment).
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