What is Minimum Balance?

A minimum balance is a threshold set by a financial institution that the depositor must maintain, either each day (daily balance method) or on average over the statement cycle (average daily balance method), to avoid a monthly service charge or to earn the advertised APY. Under the Truth in Savings Act (Regulation DD), institutions must disclose the minimum balance requirement, the method used to calculate it, and the specific fee imposed if the balance falls below the threshold.

The daily balance method checks whether the account's end-of-day balance meets the minimum on each day of the statement period. A single day below the threshold can trigger the monthly fee. The average daily balance method sums the end-of-day balance for every day in the statement cycle, divides by the number of days, and compares the average to the minimum. This method is more forgiving of brief dips.

Minimum balance requirements serve multiple institutional purposes: they encourage depositors to maintain larger account relationships, offset the bank's per-account operational costs, and in the case of money market accounts and some savings products, provide the deposit base needed to meet reserve and liquidity requirements. For consumers, selecting an account with a minimum balance requirement that aligns with typical cash flow is essential; consistently failing to meet the minimum can erode more in fees than the account earns in interest.

To help consumers avoid monthly maintenance charges, many banks offer waiver alternatives to the standard minimum balance. The most common waiver is triggered by receiving a qualifying monthly direct deposit, such as payroll or government benefits, exceeding a specified dollar amount. Many institutions also allow depositors to satisfy requirements via a 'combined balance' method, which sums the end-of-day balances across checking, savings, CDs, and even brokerage accounts linked under the same household profile. For depositors who cannot easily maintain a minimum balance, online-only banks and credit unions regularly provide 'second-chance' or basic transactional checking accounts that feature zero monthly maintenance fees and no minimum balance requirements. Under Regulation DD, banks must supply a comprehensive fee schedule at account opening to ensure depositors understand these criteria.