The fee's real significance in federal law is that it controls one word. Under 12 CFR 1030.8(a)(2) an advertisement shall not "Refer to or describe an account as 'free' or 'no cost' (or contain a similar term) if any maintenance or activity fee may be imposed on the account." Note the verb. The bar attaches to a fee that may be imposed, not one that has been, so an account carrying a waivable monthly fee cannot be advertised as free simply because a particular customer's fee happens to be waived. The commentary extends the same treatment to a near synonym: an advertisement "may not use the term 'fees waived' if a maintenance or activity fee may be imposed because it is similar to the terms 'free' or 'no cost'" (comment 8(a)-5).
What counts as a maintenance or activity fee. The commentary lists four categories: "i. Any fee imposed when a minimum balance requirement is not met, or when consumers exceed a specified number of transactions. ii. Transaction and service fees that consumers reasonably expect to be imposed on a regular basis. iii. A flat fee, such as a monthly service fee. iv. Fees imposed to deposit, withdraw, or transfer funds, including per-check or per-transaction charges" (comment 8(a)-3). The first item is the one worth carrying away, because it means a minimum balance fee is a maintenance fee under a different name for the purposes of this rule, whatever the fee schedule calls it.
What does not count, which is the more useful list. The commentary gives examples of fees that are not maintenance or activity fees: fees not required to be disclosed under 12 CFR 1030.4(b)(4), "Check printing fees", "Balance inquiry fees", "Stop-payment fees and fees associated with checks returned unpaid", "Fees assessed against a dormant account", and "Fees for ATM or electronic transfer services (such as preauthorized transfers or home banking services) not required to obtain an account" (comment 8(a)-4). The qualifier on that last item matters: an ATM fee escapes the list only where the service is not required in order to have the account. The practical consequence is exact and rarely stated. An account can be advertised as free while charging for a stop payment, for a returned item, for going dormant, for a balance inquiry and for out-of-network ATM use, because the word "free" in this rule is a claim about the cost of holding and using the account and not a claim about the fee schedule as a whole.
Three permitted uses of "free", and one closed loophole. An institution may advertise a specific service or feature as free where no fee applies to that service, provided the advertisement does not imply the account itself is free (comment 8(a)-6). It may advertise an account as free for a limited period if the period is stated (comment 8(a)-7). And it may advertise an account as free for consumers meeting a condition unrelated to deposit accounts, the commentary's own example being "free for persons over 65 years old", even where a maintenance fee applies to everyone else (comment 8(a)-8). What it may not do is disclose its way out. The commentary's list of ordinarily misleading advertisements includes advertising an account-related service that carries a fee alongside the word "free", and adds that where the fee is a maintenance or activity fee under 1030.8(a)(2), "an advertisement may not describe the account as 'free' or 'no cost' (or contain a similar term) even if the fee is disclosed in the advertisement" (comment 8(a)-10(v)).
One asymmetry in the change-in-terms rules, for the same reason. A change to a term disclosed under 1030.4(b) that may reduce the yield or adversely affect the consumer requires at least 30 calendar days' advance notice under 1030.5(a)(1). Changes in fees assessed for check printing are expressly carved out of that requirement at 1030.5(a)(2)(ii). Check printing therefore sits outside the protected set twice over: outside the fees that defeat the word "free", and outside the fees whose increase must be announced in advance.