I can't understand the role intent has to play when it comes to Karma.

Let's just say I am giving to charity (in line with the norms laid down). But I know at the back of my mind that I am doing good karma, and either this will negate bad karma, or I will reap benefits - maybe in this lifetime or next one. So does the fact that I am armed with this knowledge negate the act of charity?

I can't understand the role intent has to play when it comes to Karma.

Let's just say I am giving to charity (in line with the norms laid down). But I know at the back of my mind that I am doing good karma, so I will reap benefits - maybe in this lifetime or next one. So does the fact that I am armed with this knowledge negate the act of charity?

In my humble opinion intent should not if it were the above scenario. But then where does one draw the line ? I mean how does the expectation that I will get benefits in this life or next one any different than a quid pro quo arrangement with the said charity's chairman ?

As always will be most helpful to get scripture references.