Quantopian has some built in features for modeling slippage, commisions, and dividends. These are described in the Help section: https://www.quantopian.com/help

Quantopian has some built in features for modeling slippage, commisions, and dividends. These are described in the Help section: https://www.quantopian.com/help#ide-slippage https://www.quantopian.com/help#ide-slippage