Lump-Sum Commission: Should You Invest or Pay Off Your Mortgage? Picture this: You just closed a blockbuster deal that triggered a fat lump-sum commission. Maybe you’re a mid-career medical sales rep, juggling life on the road and ambitious sales quotas, or perhaps you’re transitioning into a new device territory with huge signing bonuses. The question hitting your mind is straightforward but loaded with implications: “Should I put this big check toward crushing my mortgage—o