In banking, IDI stands for Insured Depository Institution: a bank or savings association whose deposits are insured by the Federal Deposit Insurance Corporation. That insurance protects up to $250,000 per depositor, per bank, for each ownership category, and it covers the deposit plus any interest earned. If your bank is an IDI, the federal government stands behind your money up to that limit even if the bank fails.
What Makes a Bank an Insured Depository Institution
Federal law defines an insured depository institution as any bank or savings association whose deposits are insured by the FDIC.1Office of the Law Revision Counsel. 12 USC 1813 – Definitions These institutions are chartered under either state or federal law and must meet ongoing capital, liquidity, and management standards. The FDIC both provides the insurance and supervises how they operate.
Every FDIC-insured institution has to display an official sign, typically gold with black lettering, at each location where customers can make deposits.2eCFR. 12 CFR Part 328 – FDIC Official Signs, Advertisement of Membership That sign means the institution’s deposits are backed by the full faith and credit of the U.S. government. The money for that protection comes from the Deposit Insurance Fund, which the FDIC finances by collecting quarterly assessments from every insured institution based on its deposit base.3Federal Deposit Insurance Corporation. Assessment Methodology and Rates
One boundary worth naming up front: credit unions are not IDIs. Their deposits are insured by the National Credit Union Administration through the National Credit Union Share Insurance Fund, which is also backed by the full faith and credit of the United States.4National Credit Union Administration. Share Insurance Coverage The coverage limit and structure mirror the FDIC’s, but the two systems are legally distinct.
How the $250,000 Coverage Actually Works
FDIC deposit insurance covers $250,000 per depositor, per FDIC-insured bank, for each account ownership category.5Federal Deposit Insurance Corporation. Understanding Deposit Insurance All of your deposits in the same ownership category at the same bank are added together for insurance purposes. A checking account and a savings account, both in your name alone at the same bank, count as one insured amount up to $250,000.
The covered deposit products are straightforward:
- Checking accounts
- Savings accounts, including passbook savings
- Money market deposit accounts
- Certificates of deposit
- Cashier’s checks and money orders issued by the bank
Insurance covers both principal and accrued interest, as long as the combined total stays within the coverage limit.
Stacking Ownership Categories Past $250,000
The real leverage in FDIC insurance is the ownership category. Each category has its own $250,000 limit at each bank, so one person with deposits across several categories at the same institution can be covered for well over $250,000 without opening an account somewhere else.
A single account is one you own alone with no beneficiaries named. A joint account is treated separately: each co-owner’s share of every joint account at the same bank is added together and insured up to $250,000.6Federal Deposit Insurance Corporation. Your Insured Deposits A married couple with joint checking and joint savings at the same bank is covered up to $500,000 on those joint accounts ($250,000 per person). Each spouse could also hold a separate single account insured for another $250,000, bringing the couple’s protection at one bank to $1,000,000 before any other category enters the picture.
Certain retirement accounts, including IRAs, get their own $250,000 limit separate from single or joint accounts. If you have $200,000 in a checking account and $200,000 in an IRA CD at the same bank, both are fully insured because they sit in different ownership categories.
Trust accounts are their own category. As of April 2024, the FDIC combined revocable trusts, irrevocable trusts, and informal payable-on-death accounts into a single “trust accounts” category, with coverage calculated at $250,000 per owner, per eligible beneficiary, up to a maximum of five beneficiaries.7Federal Deposit Insurance Corporation. Financial Institution Employees Guide to Deposit Insurance – Trust Accounts That caps a single trust owner’s coverage at one bank at $1,250,000, no matter how many beneficiaries are named beyond five.
Business deposits are also separate. Deposits belonging to a corporation, partnership, LLC, or unincorporated association are insured up to $250,000 as a distinct category, provided the entity has a legitimate business purpose and was not created solely to increase insurance coverage.8Federal Deposit Insurance Corporation. Corporation, Partnership and Unincorporated Association Accounts The FDIC calls this the “independent activity” requirement. An owner with $250,000 in a personal account and $250,000 in a business account at the same bank has full coverage on both. If the FDIC decides an entity exists only to inflate coverage, it collapses the business balance into the individual’s personal coverage.
The FDIC publishes a free online tool called the Electronic Deposit Insurance Estimator (EDIE) that calculates your coverage at a specific bank across all ownership categories.9Federal Deposit Insurance Corporation. Electronic Deposit Insurance Estimator (EDIE) Running your accounts through EDIE before reorganizing anything is the cleanest way to spot gaps.
What FDIC Insurance Does Not Cover
The FDIC insures deposits, not investments. Even when you buy a product through the same institution that holds your checking account, that product may have no FDIC protection.10Federal Deposit Insurance Corporation. Financial Products That Are Not Insured by the FDIC Products outside FDIC coverage include:
- Stocks, bonds, and mutual funds
- Annuities and life insurance policies
- Crypto assets
- U.S. Treasury securities (backed by the government, but not through the FDIC)
- Safe deposit box contents
Fintech Apps and Pass-Through Coverage
Many fintech apps advertise that customer money is “FDIC-insured,” but there is a real difference between holding an account directly at an IDI and holding money through an intermediary. When a fintech is not itself a bank, your funds usually sit in pooled accounts at a partner bank. FDIC coverage reaches the underlying customer only if pass-through requirements are met.
For pass-through insurance to work, three conditions must all be satisfied at the time a bank fails:11Federal Deposit Insurance Corporation. Pass-Through Deposit Insurance Coverage
- The funds must genuinely belong to the individual customers, not to the third-party company placing them.
- The bank’s records must show the account is held on behalf of others, such as “XYZ Company as Custodian for customers.”
- Either the bank’s records, the fintech’s records, or another party’s records kept in the normal course of business must identify each customer and their ownership interest.
Break any link in that chain and customers can lose access to their money for months or longer. The 2024 collapse of Synapse Financial Technologies is the recent example: Synapse handled customer-level accounting for several fintech apps, and when it filed for bankruptcy, no one could reconcile which dollars belonged to which customers. More than 100,000 people lost access to over $265 million. The partner banks were FDIC-insured, but the records needed to prove each customer’s share were incomplete or contradictory.
Before putting significant money into a fintech platform, confirm which FDIC-insured bank actually holds the funds, and ask how your individual ownership is documented in that bank’s records. If nobody can give you a clear answer, pass-through protection is not something you can count on.
What Happens When an IDI Fails
When a bank becomes insolvent, the FDIC is typically appointed as receiver, taking over the institution’s assets and operations to resolve the failure.12Office of the Law Revision Counsel. 12 USC 1821 – Insurance Funds Federal regulation requires the FDIC to pursue the resolution method least costly to the Deposit Insurance Fund.13eCFR. 12 CFR 360.1 – Least-Cost Resolution
In most failures, a healthy bank agrees to assume the failed institution’s insured deposits and buy some of its assets. This is called a purchase and assumption transaction, and it’s meant to be seamless: your bank has a new name, and your accounts still work. When no buyer can be found, the FDIC pays depositors directly up to the insured limit, with a goal of getting insured funds into depositors’ hands within two business days of the bank closing.14Federal Deposit Insurance Corporation. Payment to Depositors
Deposits above the $250,000 limit follow a longer path. By law, uninsured depositors are paid after fully insured depositors but before general creditors and stockholders. Payments on the uninsured portion, called dividends, depend on what the FDIC recovers as it liquidates the failed bank’s assets, and disbursements can stretch over several years.15Federal Deposit Insurance Corporation. Priority of Payments and Timing Keeping deposits within insured limits is the only way to guarantee full and prompt repayment.
How to Confirm a Bank Is an IDI
The FDIC runs a free search tool called BankFind where you can look up any institution by name, FDIC certificate number, or website.16Federal Deposit Insurance Corporation. BankFind Suite – Find Insured Banks The database covers every FDIC-insured institution from 1934 to the present. If a bank does not appear in BankFind, its deposits are not FDIC-insured.
At physical branches, look for the official FDIC sign at teller windows and other deposit-taking areas. Online-only banks and fintech platforms take more work. Find out which FDIC-insured bank actually holds your funds, then verify that bank’s status in BankFind. The name on the app is often not the name of the insured institution behind it.