Individual IPS - Return Objective into, ask, individual, objective, question

Wasteoftime

in the 2009 individual IPS (question 1) for return objective they specifically tell you that any withdrawals from the portfolio are taxed at 20%…thus you can easily take in into account when they ask you for the pre-tax nominal return.
however, what if the question just stated that the XYZ couple’s is in a 20% bracket and was silent on withdrawals of funds from portfolio…..would CFAI do that or would they specifically tell about tax on withdrawals?
maybe I am just thinking too much into it.