Municipal banking is how cities, counties, school districts, and other local government entities manage public money, and it works differently from ordinary business banking at almost every level. The accounts handle enormous transaction volumes, the balances routinely exceed federal insurance limits, and the whole relationship sits inside a framework of state collateral laws, federal reporting standards, and formal procurement rules that a private company never has to think about. Understanding how municipal banking works means understanding those layers together: the daily cash management, the legal protection of public deposits, the investment of surplus funds, the fraud controls, and the procurement and reporting obligations that surround all of it.
What a Municipal Bank Handles Day to Day
The core of the relationship is the general fund. Property tax payments, permit fees, court fines, and utility billing all flow into it, and expenditures flow out. Transaction volume is the first thing that distinguishes public banking from private. A mid-sized city might process 50,000 utility payments in a single month, and every dollar has to reconcile against the general ledger automatically. Manual intervention at that scale simply doesn’t work.
Payroll is the other large recurring workload. Municipal banks run direct deposits for police officers, firefighters, public works crews, and administrative staff, and they coordinate the tax withholdings and benefit transfers tied to each paycheck. Larger jurisdictions push thousands of individual payments through on a biweekly cycle with no tolerance for errors.
Beyond the daily flow, the bank supports debt service. When a municipality issues bonds to fund infrastructure, the bank coordinates interest payments to bondholders on fixed schedules and helps the government stay current on the financial covenants attached to those bonds. A missed payment or a broken covenant can trigger a credit rating downgrade that raises borrowing costs for years.
FDIC Coverage and Why It Isn’t Enough
Federal deposit insurance for a local government works differently than it does for a private depositor. When a local government banks at an institution located within its own state, time and savings deposits are insured up to $250,000 and demand deposits are insured separately up to another $250,000, for a theoretical total of $500,000 at a single in-state bank.1Federal Deposit Insurance Corporation. Deposit Insurance for Accounts Held by Government Depositors
Use a bank located outside the government’s own state and the separate treatment goes away. All deposits held by that public unit at the out-of-state bank get combined and insured up to $250,000 total.2Federal Deposit Insurance Corporation. Financial Institution Employees Guide to Deposit Insurance – Government Accounts
Either number is trivial next to what a local government actually holds. A county that collects property taxes twice a year can watch balances spike into the tens or hundreds of millions during collection periods. That gap between insurance and reality is why collateralization exists.
How Public Deposits Are Collateralized
Federal law requires public money deposited at financial institutions to be secured against loss. Any amount over the FDIC coverage has to be backed by collateral the bank pledges.3Bureau of the Fiscal Service. Treasury Collateral Management and Monitoring Under federal regulation, a bank must pledge collateral to a Federal Reserve Bank or a designated custodian before it can receive deposits of public money.4eCFR. 31 CFR 202.6 – Collateral Security
Acceptable collateral typically includes U.S. Treasury securities, federal agency bonds, and high-rated municipal bonds, with the specific acceptable classes published by the Bureau of the Fiscal Service.4eCFR. 31 CFR 202.6 – Collateral Security
State Rules on Ratios and Pooling
Each state sets its own rules on how much collateral banks must pledge against local government deposits. Required ratios typically run from 100% to 110% of the deposit amount above FDIC coverage, though some states go as low as 50% or as high as 150% depending on the bank’s financial condition and the type of collateral pledged. A strong bank pledging U.S. Treasuries might face a 100% requirement; a weaker one pledging less liquid collateral could face a much higher ratio.
Some states run pooled collateral programs, where multiple banks contribute to a shared pool covering all participating public depositors. Others use a dedicated method, where each bank pledges collateral specifically for its own public deposits. Pooling spreads risk but requires participating banks to accept shared liability if another institution in the pool fails.
Custody and Monitoring
Collateral should sit at an independent third-party custodian outside the holding company of the depositor’s bank, documented in a written custody agreement between the custodian and the government. The value of pledged collateral needs to be marked to market regularly, because a drop in market value can leave deposits under-collateralized. When large sums flow in quickly, as they do around a property tax deadline, daily monitoring of both balances and collateral levels becomes essential.
Investing Idle Funds
Local governments don’t leave surplus money sitting in a checking account. Most jurisdictions require or allow treasurers to invest idle funds to earn a return for taxpayers, inside strict guardrails set by state law. The universal priority order is safety first, liquidity second, yield third. No treasurer should chase returns at the cost of meeting payroll next Friday.
Permitted investments vary by state but commonly include U.S. Treasury obligations, federal agency securities, certificates of deposit, and shares in local government investment pools (LGIPs). LGIPs work somewhat like money market funds designed for public entities, pooling resources from multiple jurisdictions to reach diversification and returns that no single small government could manage alone.5Municipal Securities Rulemaking Board. LGIP Investment Pool Structure
The banking relationship matters here because banks often provide the custodial services for these investments, execute trades, and deliver the reporting that feeds the government’s financial statements. A municipality’s investment policy should spell out which investment types are authorized, what maturity limits apply, and how diversification will be maintained, and the governing board should adopt and review it at least annually.
Fraud Controls Built Into the Account
Public accounts are high-value targets, and the fraud tools built into a municipal banking platform go well beyond passwords. The most important one is positive pay. The government uploads a file of every check it issues (number, amount, date) and the bank rejects any check that doesn’t match. Payee positive pay adds name verification, so an altered payee line on a stolen check gets flagged before the bank pays it.
On the electronic side, ACH blocks and filters control who can pull money out of a government account through the automated clearing house. A full ACH block prevents all incoming debits. Filters are more nuanced, allowing pre-authorized transactions from approved vendors while rejecting everything else. A single unauthorized ACH debit can drain hundreds of thousands of dollars before anyone notices, so these controls are not optional for any government holding meaningful balances.
Standard protections also include real-time intraday account access so treasury staff can monitor transactions throughout the day, and Universal Payment Identification Codes that mask the government’s actual account numbers from outside parties. Bank-provided reconciliation tools help catch discrepancies before they turn into audit findings.
How Governments Choose and Pay a Bank
Municipalities select banking partners through a formal Request for Proposal process, not a phone call. Before issuing the RFP, the treasurer’s office compiles detailed transaction data: how many checks the government issues, how many ACH payments it processes, how many wires it sends and receives. Treasurers typically review at least 24 months of bank statements to establish average daily balances and identify peak liquidity periods like property tax collection windows.
The RFP specifies technology requirements as well. If the government runs a particular accounting or ERP system, the bank’s reporting formats need to integrate for automated reconciliation. Incompatible systems create manual work that eats staff time for the length of the contract. The RFP also addresses collateral, fraud prevention, disaster recovery, and branch access for staff handling physical deposits.
Responding banks generally have 30 to 60 days to submit. A committee of financial officers scores proposals against a weighted matrix covering pricing, technical capability, fraud tools, regulatory compliance history, and financial stability, with category weights set before any proposals are opened. The recommendation then goes to the council or governing board for a public vote. Contracts commonly run three to five years, often with renewal options.
Earnings Credit and Fees
Fees work differently here than in consumer or small business banking. Most government relationships use an earnings credit rate: the bank calculates a credit based on the government’s average collected balances and applies it against monthly service charges. If balances are high enough, the credit can wipe out fees entirely.
That structure creates its own tension. Concentrating balances with the primary bank maximizes the earnings credit but conflicts with the goal of spreading deposits across institutions to limit concentration risk. Some governments negotiate a mix of direct fee payment and earnings credit to keep flexibility. When comparing RFP responses, a fee schedule that looks cheapest on paper may not be cheapest in practice; the answer depends on the government’s actual transaction mix.
Reporting and Audit Support
A municipal bank has to support the government’s annual financial reporting, which follows standards set by the Governmental Accounting Standards Board.
GASB 34
GASB Statement No. 34 established the basic framework for how governments present their financial statements. Governments must report information about major funds (including the general fund) individually rather than lumping fund types together. Annual reports must include budgetary comparison information showing both the original and revised budgets. When a government charges fees for services like water or electricity, those financials must use accrual-basis accounting to capture the full cost of service delivery.6Governmental Accounting Standards Board. Summary of Statement No. 34
GASB 40
GASB Statement No. 40 addresses what governments must disclose about deposit and investment risk. It requires disclosure of deposits that aren’t covered by depository insurance and are either uncollateralized, collateralized with securities held by the pledging bank itself, or collateralized with securities held by the bank’s agent but not in the government’s name. It also requires disclosure of policies on concentration of credit risk.7Governmental Accounting Standards Board. Summary – Statement No. 40
These disclosures tell taxpayers and bond investors whether the government’s cash is actually protected. Large uncollateralized balances, or collateral held in the pledging bank’s own name rather than by an independent custodian, signal a weakness that auditors will flag and credit analysts will notice. A banking partner’s ability to produce clean reporting that feeds directly into these disclosures is one of the less obvious but genuinely important selection criteria.
Public Banks as an Alternative Model
Almost all local governments bank with private commercial institutions that run dedicated government banking departments. Those departments know the regulatory and reporting requirements of the public sector and offer specialized platforms for positive pay integration and automated ledger reconciliation. Private banks operate for profit, answer to shareholders, and compete for municipal business on fees, technology, and service quality.
A publicly owned bank is a different structure, where the government itself has an ownership stake and governance authority over the institution. The Bank of North Dakota, established in 1919, remains the only state-owned bank in the country and is the primary reference point for the model.8Bank of North Dakota. Bank of North Dakota Rather than competing with local commercial banks, it partners with them, participating in loans and providing services like student loan administration that private banks in a rural state might not offer profitably on their own.
Governance in public banks typically falls to a commission or board of elected or appointed officials who set policy priorities. The core idea is that deposits generate lending capacity, and a public bank can direct that capacity toward local priorities like affordable housing, small business development, or infrastructure rather than toward shareholder returns. Interest in the model has grown, with several major cities and states moving beyond study into active planning, but a bank charter, initial capital, and operational infrastructure are serious hurdles. For now, the private commercial model is what almost every local government actually uses.