WASHINGTON (AP) — Banks will have to secure their customers' consent before charging large overdraft fees on ATM and debit card transactions, according to a new rule announced Thursday by the Federal Reserve.

The rule responds to complaints from consumer groups, members of Congress and other regulators that the overdraft fees are unfair because many people assume they can't spend more on a debit card than is available in their account. Instead, many banks allow the transactions to go through, then charge fees of up to $35.

Under the Fed's new rule, which will take effect July 1, banks will be required to notify new and existing customers of their overdraft services and give customers the option of being covered. If customers don't "opt in," any debit or ATM transactions that overdraw their accounts will be denied, Fed officials said.