Automatic Early assignment not realistis

Based on the provided code, it seems that 'Alun' is trying to implement a Bull Call Spread strategy. However, the code does not seem to have any functionality related to disabling simulated early assignment.

In QuantConnect, the simulated early assignment of options is automatically handled by the backtesting engine. When the underlying stock's price is beyond the strike price of the option, the engine will trigger an assignment event. This is to simulate the real-world scenario where the option holder may choose to exercise the option when it is in-the-money.

If 'Alun' is experiencing a 167% drawdown, it might not be due to the simulated early assignment functionality. It could be due to the strategy itself or other parts of the code. It's recommended to thoroughly debug the algorithm, check the logs and order events, and make sure the algorithm behaves as expected.

Unfortunately, without more specific information about the error or the unexpected behavior, it's hard to provide a more detailed solution. If 'Alun' continues to experience issues, they might want to consider posting a more detailed question on the QuantConnect forum where the community and the QuantConnect team can provide more targeted assistance.

Alun, 

Did you find an answer to this?  I am also experiencing this.  My algorithm is using SPXW and Credit spreads.  It doesn't seem to be related to early assignment if I also experience this with SPXW.

Hi Alun Thomas 

Intrigued to investigate the matter, I decided to troubleshoot the issue. After making a minor adjustment, I conducted a backtest and observed a drawdown of 3.5%:

# in the SelectCallSpreadLegsByDelta method
if len(applicableContractList) >= 2: #Got Enough contracts
	closestBuyContract = applicableContractList[0]
	pairedSellContract = applicableContractList[1]

else:
	return

return [pairedSellContract, closestBuyContract]

It could be beneficial to revisit and debug your code once more. If you encounter any challenges, feel free to reach out.

I'm experiencing the same kind of issue due to early assignment simulation as well, unexpected account drawdown when trading credit spreads, even with SPXW (didn't think early assignment was a thing for options like SPX, but it seems to be in QuantConnect).

I posted a very simple backtest demonstrating the problem here: Early assignment for SPX? by Dennis - QuantConnect.com