You win a $4 million breach of contract case in Manhattan Supreme Court after three years of litigation. The judge signs the judgment. Then your lawyer tells you the number just grew by more than a million dollars — because prejudgment interest in New York breach of contract cases runs at 9% per year, calculated back to the day the contract was breached. That's not a bonus. That's the law. And most business owners running $1M–$10M disputes don't understand how dramatically th