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The shorts on option spreads should always be supported by theta. Theta is always friend to the option writer as the sensitivity of an option’s value to the passage of time. It is usually expressed as the change in value per one day’s passage of time.
Well, for demonstration purpose we've chosen AUD/USD "Credit Call Spread" that we had advocated this option strategy exactly a week ago:
For more readings as to why and how was it executed, please follow below link:
The strategy reads this way,
At spot rate reference on 23rd May 0.7220, long in 1M (1%) OTM 0.36 delta call while writing 1W (1%) ITM call with positive theta and delta closer to zero (both sides use European style options),
If you glance the strategy using above web link, then you would have been convinced with the certain yields that fetched you from ITM shorts.
So far short side of this strategy is performing well enough, these positions would have fetched certain yields as the underlying spot rates on expiry (i.e. 30/05/2016) are flashing at 0.7148 levels, which means premiums received from short side can be comfortably pocketed in.
As long as all other parameters remain the same.
For a buy (long) option position, Theta is negative and for a sell (short) option position, Theta is positive; time decay is bad for a buyer, good for a seller.
In the AUDUSD platform’s sensitivity table, Theta is given as an amount in the traded pair’s secondary currency, for an instance, 1W ATM theta here is 25.41 which means on every 1 day completion option value is likely to wipe off by USD25.41.
Theta is not a constant, it changes as the underlying market moves and time passes.
The Theta of ATM options is higher and as time draws nearer to expiry, it increases. If you are holding an ATM option and expiry is approaching, you might be better off closing out of your position.
Option sellers can reap the benefits of a high Theta near expiry by selling short dated ATM options with the expectation of little to almost no market movement.
For ITM and OTM options as time to expiry draws nearer, Theta lowers and decreases, likewise the premiums on AUDUSD 1% ITM strikes would have been wiped off along with time decay.
