Before I make an offer, I don't just run the numbers once. I run what happens when things go wrong. What if it sells for less than I think? What if the renovation goes over budget? What if the buyer asks for a bigger concession at closing? If I can still walk away making money after all three, I buy it. If one bad month wipes out my profit, I don't. That's why I have a minimum profit I need on every flip, and why I've moved toward houses in areas where prices are still going up. It's a lot easier to make it work when the worst case is still a win. Which one worries you most: selling for less, going over budget, or concessions? Tell me below.