Question: Quarterly taxes on LLC member income

Let's say I am the only member of an LLC and the business makes 20k through wholesaling in a given quarter. If my marketing expenses were 3k, I suppose I would be expected to pay personal taxes on the remaining 17k. But what if that 17k is immediately fed back into the business, for instance as a portion of a down payment on a buy and hold? Do I owe zero taxes for this quarter?