Deposit insurance is described as a fixed amount of protection per person, which is incomplete. The coverage rules turn on ownership categories, and they determine how much of a balance is protected.
Three variables define the limit
Coverage is calculated per depositor, per insured institution, and per ownership category, and all three must change for a depositor to obtain additional coverage.
This means moving money between branches of the same institution does nothing, because the limit attaches to the institution rather than the location.
It also means two accounts of the same type at one institution are added together, since they occupy a single category for that depositor.
Ownership categories are the mechanism
Single accounts, joint accounts, certain retirement accounts and trust accounts are treated as separate categories, each with its own limit.
A joint account is insured for each co-owner's interest, so a two-owner account can carry substantially more coverage than a single account at the same institution.
Trust arrangements are insured based on beneficiaries under rules that have been revised in recent years, and the details are technical enough that account holders often confirm them directly.
What deposit insurance does not cover
The protection applies to deposits, meaning checking, savings, money market deposit accounts and certificates of deposit issued by the insured institution.
Investment products sold through a bank, including mutual funds, annuities, stocks and bonds, are not deposits and are not covered regardless of where they were purchased.
Contents of a safe deposit box are also outside the scheme, since the institution is providing storage rather than holding a deposit obligation.
Failure resolution is designed to be invisible
When an insured institution fails, the usual resolution is a purchase and assumption, in which another institution takes over the deposits and branches reopen normally.
Depositors in that case generally see continuity of access rather than a claims process, with account terms subject to later change by the acquiring institution.
Where no acquirer is found, insured amounts are paid directly, and uninsured portions become claims against the receivership with recovery depending on asset sales.
Structuring around the limit is routine
Depositors holding more than the limit commonly spread balances across institutions or use ownership categories deliberately to extend coverage.
Network services exist that distribute a large deposit across many institutions administratively, keeping each portion within the limit while the customer deals with one relationship.
Because the rules are specific and are periodically amended, confirming coverage for a particular account structure with the institution or the insurer's own calculator is the reliable step.