A minimum balance is the lowest amount of money that must be kept on deposit in an account for the account holder to qualify for certain benefits, such as a waived monthly service fee, a stated interest rate, or free access to additional features. Banks set minimum balance requirements on many account types, including checking, savings and money market accounts.
Minimum balance requirements are one of the main ways banks manage the cost of offering free or low-fee accounts. Maintaining customer deposits that stay above a certain level gives the bank a stable base of funds it can lend out, so banks are often willing to waive fees for customers who keep enough money on deposit, while charging a service charge to those who do not.
Minimum balance in plain terms
A minimum balance works a little like a gym membership tier: stay above a certain spending or balance threshold, and certain perks come free; drop below it, and a monthly fee kicks in. The account itself does not stop working if the balance falls below the minimum, but the account holder typically loses the benefit that the minimum balance was unlocking, whether that is a fee waiver or a particular rate.
Some accounts set the requirement as an average balance across the month rather than a balance that must never dip below the threshold at any single moment, which gives account holders some flexibility if their balance briefly drops due to a large payment or withdrawal.
What happens below the minimum
Falling below a required minimum balance commonly triggers one of a few outcomes: a flat monthly maintenance fee is charged, a higher interest rate tier no longer applies, or certain free services, such as unlimited transactions, are withdrawn for that period. Few banks close an account automatically for falling below a minimum balance unless it falls to zero and stays inactive, which can eventually lead to the account being treated as a dormant account.
Why banks use minimum balances
Minimum balance requirements let banks offer accounts with no fees to customers who keep a meaningful amount on deposit, while recovering costs from customers who keep very little in the account but still use its services, such as processing checks and electronic payments. They also encourage customers to consolidate savings in one institution rather than splitting small amounts across many accounts.
Minimum balance requirements across account types
Minimum balance thresholds vary considerably depending on the type of account and the bank offering it. A basic checking account might require only a small balance, or none at all, to avoid a fee, while premium accounts offering additional perks such as fee-free foreign transactions or dedicated relationship managers often set much higher minimum balance thresholds, reflecting the higher value the bank places on retaining those larger deposit relationships.
Some banks allow a customer's combined balances across several accounts, such as checking, savings and a linked investment account, to count toward a single minimum balance requirement, a practice sometimes called relationship banking, which can make it easier for customers to avoid fees without needing to concentrate all their funds in one specific account.
Minimum balance and low-income banking access
Consumer advocates have long raised concerns that minimum balance requirements can disadvantage lower-income customers, who may be least able to maintain the required balance and therefore end up paying exactly the fees the requirement was meant to help them avoid. In response, many jurisdictions have encouraged or required banks to offer basic, low-cost or no-minimum-balance accounts specifically designed for customers who might otherwise struggle to meet standard account thresholds, supporting broader financial inclusion goals.
Comparing minimum balance requirements across providers, alongside the size of any associated fee, remains one of the simplest ways for a customer to estimate the realistic cost of holding an account given their typical balance patterns throughout the year.
Some institutions calculate the minimum balance requirement using the lowest balance recorded at any point during the period, rather than an average, which is a stricter standard that can be easy to miss if a customer briefly dips below the threshold even for a single day.