The goal of 529 plans is to make it easier to save for college. These tax-advantaged investment accounts allow you to save and use the growth tax-free to pay for qualified educational expenses. Like most tax-advantaged accounts, however, there are rules about how much you can contribute — and what you can pull the funds for. That can create issues if you accidentally overcontribute. That's the situation Becky is facing after accidentally contributing $10,000 instead of$1,000 to her daughter's 529 account ...