"Too much" money in a bank is a relative concept, but from a financial management perspective, it occurs when your cash holdings exceed the limit of government-backed deposit insurance (such as the FDIC $250,000 limit) and when those funds are not earning a return that keeps pace with inflation. When you exceed the deposit insurance cap, you are essentially acting as an unsecured creditor to the bank for the amount over the limit, which is an unnecessary risk for most individual savers. Furthermore, if your "excessive" bank balance is simply sitting in a low-interest checking or savings account, you are effectively shrinking your purchasing power over time. A balanced financial strategy involves keeping enough liquid cash in the bank for emergencies and short-term obligations, while moving all other wealth into diversified portfolios that can achieve growth. If you are struggling to decide what to do with a large bank balance, consult a financial advisor to help you structure an investment plan that optimizes your tax efficiency and long-term capital growth potential.