Quote from a529612:
How would that work out in an IRA "cash account" since the short will involve the use of margin?
You are not borrowing money when you sell an option. The margin is the amount of cash you need to have in your account to cover your max loss basically.
Here is an example taken from thinkorswim.com:
# How do I calculate the margin on a short call or short put?
The margin requirement of a short call or short put involves three calculations. The margin required is the largest value of the results of those calculations.
The calculations are:
1) 100% of the proceeds of the sale + 20% of the stock value ? the out-of-the-money value
2) 100% of the proceeds of the sale + 10% of the stock value
3) 100% of the proceeds of the sale + minimum dollar amount per option contract (currently $250)
For example, the margin required to sell 3 XYZ Apr 50 calls at $2.00, with XYZ at $49.00 is found through the formulas above.
1) $600 + $2940 - $300 = $3240
2) $600 + $1470 = $2070
3) $600 + 750 = $1350
The margin requirement is, therefore, $3240.
The same method is applied to find the margin on short puts.