Discussion Forum

Hi Jenny,

One way to solve this is by defining a SecurityInitializer function and setting the fee model in that function (docs). First, we define a custom SecurityInitializer function:

def CustomSecurityInitializer(self, security):
security.SetFeeModel(CustomFeeModel())

Then, we set our algorithm’s SecurityInitlializer with this line:

self.SetSecurityInitializer(self.CustomSecurityInitializer)

Please see the attached backtest for an implementation.

Best,
Shile Wen

Hi Shile Wen

Thank you for your reply. However, what i meant was i wanted to implement the fee model that calculate the fee only at the end of each year rather than each time when an order was placed for the specific security. For instance, the 2/20 fee which will only be computed at the end of each year based on the portfolio value. Was wondering if this is possible? 

Thank you. 

Hi Jenny, 

I think you've talked at cross purposes. The Custom Fee Model is inappropiate for your intentions as it refers to the fees of order executions. As far as I know there is no such thing as a "Management Fee Model" for Financial Advisors. 

Of course you can add your own management fee model to your algorithm. But we are not able to modify the objects TotalPortfolioValue or TotalFees directly as they are read-only. But we can use a workaround and create our own variable which stores the fee-adjusted equity. 

I've build a simple algorithm for you which should give you a good starting point. You can see a plot (black line) of the fee adjusted equity in the attached backtest after you've cloned the algo and run your own backtest. 

Hi Jenny,

I include the answer to this in the newer thread, so I will close this thread.

Best,
Shile Wen