FDIC Would End In-House Deposit Insurance Calculation at 31 Banks, Five Holding About $6.8 Trillion
The FDIC proposes to rescind part 370, moving the deposit insurance calculation for 31 large banks from their systems to its own; bank risk officers, corporate treasurers and holders of uninsured balances should read the evidence behind that handoff.
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The consensus reading is routine burden relief: the FDIC Board voted unanimously on 30 October (FDIC, 30/10/2026) to propose rescinding part 370, which the FDIC values at about $33 million a year in industry savings (Federal Register, 04/11/2026). The weak signal is where the payout risk goes. Part 370 made banks with two million or more deposit accounts build systems that calculate insured deposits, partly to offset limits in FDIC systems (Federal Register, 04/11/2026). The proposal retires that build at 31 banks, five holding about $6.8 trillion in domestic deposits, because the FDIC believes its own capacity has improved. Our reading is that the FDIC becomes the only calculator on a stated expectation. Comments close 4 January 2027.
Signal Identification
A regulatory pivot in who carries payout risk: a safeguard banks built and the FDIC tested periodically gives way to the FDIC’s own systems, while section 360.9 data and provisional-hold duties remain.
What's Changing
The Board approved the proposal on 30 October 2026 (FDIC, 30/10/2026). Of 4,287 insured institutions, 148 would be affected, including 31 part 370 institutions, 29 of them becoming larger covered institutions under revised section 360.9 (Federal Register, 04/11/2026). Five of the 31 hold about $6.8 trillion in domestic deposits, 13 about $3.6 trillion and 13 about $1.4 trillion (Federal Register, 04/11/2026).
The FDIC puts savings at about $33 million a year against $14 million of first-year cost, a net $19 million, and concedes its estimates likely understate costs (Federal Register, 04/11/2026). It expects to make most insured deposits available by the next business day (Federal Register, 04/11/2026). Atlanta Fed research finds uninsured depositors suffer no losses in 94% of failures, yet in its model reducing bailouts raises run-driven failures (Federal Reserve Bank of Atlanta, 28/09/2026).
The FDIC’s June proposal on resolution submissions moves the same way: raising the threshold from $50 billion to $100 billion would drop 16 of 48 institutions, holding about $1.2 trillion in assets (Federal Register, 30/06/2026).
Deposits at the 31 banks, and the path from vote to compliance
Source basis: Federal Register, 04/11/2026 (Call Report deposits as of 31/03/2026; compliance periods run from a final rule’s effective date, not yet set).
Disruption Pathway
Three stages. Through 4 January 2027, comments test the FDIC’s belief that its capacity has improved. A final rule then sets an effective date; larger covered institutions have six months for most section 360.9 duties and 18 months for provisional holds (Federal Register, 04/11/2026). From those dates part 370 certification and the periodic FDIC testing it provides end (Federal Register, 04/11/2026), leaving the FDIC’s system as the only calculation route. Our reading is that no public test of it at this scale is on the record.
Stress concentrates in three places. Capacity: part 370 was written partly because FDIC systems were limited at the volume of a large failure, and the notice answers with a belief, not a measured result (Federal Register, 04/11/2026). Data: deposit records at failure may be inconsistent or incomplete (Federal Register, 04/11/2026). Run risk: reducing bailouts raises run-driven failures in the Atlanta Fed model (Federal Reserve Bank of Atlanta, 28/09/2026). Corporate treasurers should add payout readiness to counterparty review, and pressure should build for the FDIC to publish a capacity test before the final rule.
Why This Matters Now
Chief risk and operating officers at the 31 banks, corporate treasurers and CFOs who hold uninsured balances, and deposit-insurance policy advisers own this decision. Three pieces of decision architecture need revising: the comment position due by 4 January 2027, counterparty limits that assume next-business-day access to insured deposits, and any business case that treats part 370 systems as sunk cost. On the available evidence the savings are small beside the exposure: about $33 million a year against about $6.8 trillion in domestic deposits at five banks alone.
Decision-action posture for this signal: Prepare: test payout assumptions in counterparty limits and file a comment now; commit limits or capital only if the final rule keeps the proposal unchanged without a published FDIC capacity measure.
Counter-Argument
The strongest objection is that this is cost-benefit correction, not risk transfer. The FDIC says part 370 can go “without materially impeding” its ability to calculate deposit insurance (Federal Register, 04/11/2026); banks keep the section 360.9 data and hold duties, and a compliance analysis calls it a handoff, not an elimination (Reg Reporting Desk, 01/11/2026). Uninsured depositors also lose nothing in 94% of failures (Federal Reserve Bank of Atlanta, 28/09/2026), and BPI wants less FDIC-mandated testing, not more (Bank Policy Institute, 31/08/2026).
That is partly right and narrows the signal without removing it. The case rests on the FDIC’s belief, and the notice concedes its cost estimates likely understate costs (Federal Register, 04/11/2026). The same model that shows few losses shows runs rising when protection weakens (Federal Reserve Bank of Atlanta, 28/09/2026). The risk is not that the rule is wrong; nobody has yet shown that the FDIC side of it works.
Implications
The sources suggest a durable shift in where deposit-insurance readiness is proven: from bank systems tested periodically to FDIC systems expected to suffice. The inflection window runs from the January 2027 comment close through compliance dates after a final rule. The June resolution-submission proposal is the canonical companion, cutting bank-side preparation for 16 institutions (Federal Register, 30/06/2026). Banks gain a lower burden; depositors with large uninsured balances, and the FDIC, carry the cost if that expectation fails.
Early Indicators to Monitor
- A final rule or FDIC statement published before 31 December 2027 includes a time-to-pay measure or test result for the FDIC’s own systems at the banks affected.If this happens: The assurance now rests on evidence; keep Prepare and read the measure against the next-business-day expectation.
- A comment filed before the docket closes on 4 January 2027 by a bank trade group, auditor or former FDIC official asks the FDIC to test its own systems at the 31 banks.If this happens: Informed opposition exists; expect a longer transition or added evidence in the final rule.
- The final rule shortens the 18-month provisional-hold period for larger covered institutions.If this happens: The FDIC itself treats the handoff as the weak point; the posture moves toward Decide on counterparty limits.
- A bank with at least $2 billion in deposits fails and the FDIC misses next-business-day access to most insured deposits, as reported by the FDIC.If this happens: Observed payout speed becomes the test; reopen the comment position and treat the savings case as unconfirmed.
- A final rescission of part 370 takes effect before 31 December 2028 without changing the larger covered institution tier.If this happens: The signal has landed in its base form; commit to payout-readiness diligence on large-bank counterparties.
Disconfirming Signals
- The FDIC publishes a test of its own systems at the largest banks showing next-business-day payout of most insured deposits.
- The final rule keeps part 370 in place for the five Highest Complexity banks.
- The Board withdraws or substantially narrows the proposal after comments close on 4 January 2027.
- The FDIC Inspector General or GAO reviews the FDIC’s deposit insurance determination capacity and reports no material gap.
- A large-bank failure in 2027 or 2028 is paid out on FDIC systems within the next business day.
Strategic Questions
- Do we rely on the FDIC’s payout assurance in counterparty limits, or first ask large-bank counterparties for readiness evidence?
- Do we keep in-house deposit calculation capability after rescission, or retire it for the savings?
- Which of our current activities looks least wise if this signal lands?
Keywords
FDIC; part 370; deposit insurance determination; section 360.9; provisional holds; uninsured deposits; bank resolution; large-bank failure; payout speed; Deposit Insurance Fund
Bibliography
Source tiers: Tier 1, governments, regulators and intergovernmental bodies. Tier 2, think-tanks, academic institutes, major consultancies and quality data providers. Tier 3, quality journalism and specialist trade press. Tier 4, vendor, company and practitioner sources, used only as directional corroboration.
- Tier 1 Large-Bank Deposit Insurance Determination Modernization (91 FR 69642). Federal Register (04/11/2026).
- Tier 1 FDIC Board of Directors Approve New Action. FDIC (30/10/2026).
- Tier 1 Resolution Submissions Required for Covered Insured Depository Institutions (proposed rule). Federal Register (30/06/2026).
- Tier 2 Bailing Out (Firms’) Uninsured Deposits: A Quantitative Analysis, Working Paper 2026-16. Federal Reserve Bank of Atlanta (28/09/2026).
- Tier 2 FDIC Part 370 Rescission: Section 360.9 Data Duties. Reg Reporting Desk (01/11/2026).
- Tier 3 FDIC proposal would rescind record keeping rule. Financial Regulation News (03/11/2026).
- Tier 4 BPI Responds to FDIC Resolution and Assessments Proposals. Bank Policy Institute (31/08/2026).