A zero-balance account is a corporate checking account built to end every business day at $0.00. Money moves automatically between one master account and a set of linked subsidiary accounts, so each department or entity keeps its own account for payments and deposits while the company’s cash pools in one place overnight. Treasury teams use the structure to eliminate idle balances scattered across dozens of accounts and to see, in one number, how much cash the organization actually holds.
How the Structure Works
A ZBA arrangement has two layers. The master account, sometimes called the concentration account, holds the company’s pooled cash. The subsidiary accounts handle day-to-day transactions but carry no balance at the close of business.
When a check or electronic payment hits a subsidiary account, the bank transfers the exact amount needed from the master to cover it. When a deposit or incoming wire lands in a subsidiary account, that money sweeps up to the master. These automated transfers run at end of day, restoring each subsidiary to zero before the next cycle begins.1Federal Reserve. Commercial Bank Examination Manual – Deposit Accounts Every dollar the company owns sits in one place overnight, where it can earn interest or be deployed for short-term investments.
During the day, subsidiary accounts can carry temporary balances because the sweep hasn’t run yet. The bank is effectively extending unsecured intraday credit, known as a daylight overdraft, each time it honors a payment against a subsidiary before funds arrive from the master.1Federal Reserve. Commercial Bank Examination Manual – Deposit Accounts Banks manage that exposure through internal credit policies, and examiners review those policies. From the company’s side, the intraday mechanics are invisible: transactions process normally, and the sweep handles the rest.
What Businesses Use ZBAs For
The pattern shows up wherever a company wants clean accounting boundaries without fragmenting its cash.
Payroll
A payroll ZBA receives only the exact total needed to cover direct deposits or issued checks on payday. Nothing sits in the account before or after the run. That limits the window for unauthorized withdrawals and makes reconciliation straightforward, because every transaction in the account is a payroll transaction.
Departmental Spending
Each department can operate its own subsidiary account with spending limits tied to its budget. Managers approve their own transactions, but the actual cash never leaves the master account until a payment clears. Finance gets granular visibility into who spent what without maintaining separately funded accounts for every cost center.
Debt Service and Loan Paydowns
Companies use ZBAs to automate interest and principal payments. A more aggressive version, the line-of-credit sweep, takes excess cash from the master at end of day and applies it against a revolving credit line, reducing overnight interest expense. If the operating balance drops below the target the next morning, the sweep reverses and pulls funds back from the line.
Merchant Card Settlement
Businesses that process card payments can route settlement funds through a dedicated ZBA. On each settlement date, the processor credits the subsidiary, and the nightly sweep moves those funds to the master. Card revenue stays isolated from other cash flows, which simplifies reconciliation against processor statements.
How ZBAs Compare to Other Cash Management Tools
A ZBA isn’t the only way to concentrate cash or manage disbursements. Two alternatives come up often.
Controlled Disbursement Accounts
A controlled disbursement account gives you early-morning notification of the exact dollar amount of checks that will clear that day, and you fund the account with a single transfer. A ZBA, by contrast, funds each transaction automatically and settles at end of day.2First Citizens Bank. Controlled Disbursement Account CDAs are about timing visibility, knowing by 8 or 9 a.m. what your outflows will be so you can make investment decisions. ZBAs are about structural simplification, eliminating manual transfers entirely. Many large treasury operations use both.
Investment Sweep Accounts
An investment sweep moves excess cash into a money market fund or other short-term vehicle overnight rather than pooling it in a master checking account. A ZBA keeps everything in a demand deposit account where it’s immediately available. An investment sweep earns a higher return but may involve slight delays in accessing the funds. The right choice depends on the yield differential against daily liquidity needs.
Opening a Zero-Balance Account
Setting up a ZBA is more involved than opening a standard business checking account because the bank has to configure the master-subsidiary relationship and the automated sweep logic.
You’ll need your nine-digit Employer Identification Number. The IRS issues EINs to businesses, tax-exempt organizations, and other entities, and banks use them for tax reporting and to verify the company’s legal existence.3Internal Revenue Service. Employer Identification Number You’ll also provide the account number of the existing master account that will fund the subsidiaries.
Federal law requires banks to verify the identity of anyone opening an account. Under the Customer Identification Program rules, the bank must collect each signer’s name, date of birth, address, and taxpayer identification number, then verify that information using unexpired government-issued photo identification such as a driver’s license or passport.4eCFR. 31 CFR 1020.220 – Customer Identification Program For the entity itself, the bank may ask for certified articles of incorporation or a government-issued business license. This identity verification requirement comes from the Bank Secrecy Act, which directs the Treasury Department to set minimum standards for customer identification at financial institutions.5Office of the Law Revision Counsel. 31 USC 5318 – Compliance, Exemptions, and Summons Authority
The service agreement is the contract that authorizes the bank to perform automated sweeps without requiring manual approval for each transfer. It specifies the linked account structure, the sweep threshold (almost always zero), and the fee schedule. Each subsidiary account is explicitly mapped to the master within this document.
Banks charge separately for the master account and each subsidiary, and some add a one-time setup fee. Published fee schedules from several banks show master account maintenance fees ranging from $20 to $50 per month and subsidiary fees from $10 to $30 per month.6Truist. 2026 Price Changes7Mechanics Bank. Schedule of Fees and Charges – Commercial Treasury Products8BancFirst. Zero Balance Account Fee Schedule A company with 15 subsidiary accounts could easily pay $200 to $500 per month in ZBA maintenance alone, so the cost has to be weighed against the labor savings from eliminating manual cash transfers and the interest earned by concentrating idle balances.
Fraud Controls the Structure Requires
Concentrating all cash in one master account creates efficiency, and also a single point of failure if controls are weak. The Office of the Comptroller of the Currency recommends several layers of protection that apply directly to ZBA structures.9Office of the Comptroller of the Currency. Operational Risk – Fraud Risk Management Principles
- Positive pay. The company uploads a file of authorized check numbers and amounts to the bank each day. Any check that doesn’t match the file is flagged and held for review before the bank pays it. ACH filters work similarly for electronic debits, letting only pre-approved originators pull funds.
- Dual controls. No single person should be able to initiate and approve a transfer from the master. Requiring two signers or a maker-checker workflow for manual overrides prevents both internal fraud and costly mistakes.
- Segregation of duties. The person who sets up new subsidiary accounts shouldn’t be the same person who reconciles them. Separating these roles makes it harder for anyone to create a phantom account and siphon funds undetected.
- Access management. Limit who can view the master balance, modify sweep thresholds, or add authorized signers, and review permissions regularly, especially after employee departures.
These controls matter more in a ZBA environment than in a traditional structure because the automated sweep means a fraudulent transaction on any subsidiary drains the master account without human intervention. The sweep doesn’t distinguish between legitimate and unauthorized debits. It covers whatever clears.
FDIC Insurance and Concentration Risk
Because ZBA sweeps move all funds into the master by end of day, the entire pool is treated as one deposit for insurance purposes. FDIC coverage maxes out at $250,000 per depositor, per insured bank, per ownership category.10FDIC. Understanding Deposit Insurance For a large company with millions in the master account, the vast majority of that cash is uninsured.
The subsidiary accounts don’t help. Since all accounts in a ZBA arrangement are usually owned by the same legal entity, moving funds between the master and subsidiaries doesn’t change the company’s insurance status.11FDIC. Sweep Account Disclosure Requirements Frequently Asked Questions The FDIC determines coverage based on end-of-day ledger balances, and for a ZBA, that means the full amount sits in the master.12Federal Register. Processing of Deposit Accounts in the Event of an Insured Depository Institution Failure Some companies mitigate the exposure by spreading ZBA structures across multiple banks, using the IntraFi (formerly CDARS) network to distribute deposits, or investing excess balances in government securities that carry their own protections.
Intercompany Interest When Subsidiaries Are Separate Entities
When the subsidiary accounts belong to separate legal entities within a corporate group rather than departments of the same company, the ZBA creates intercompany balances that have tax implications. The master account earns interest on the pooled cash, but each subsidiary contributed some portion of those funds. Allocating that interest back to each entity isn’t optional. It’s a transfer pricing issue.
The IRS has authority under Section 482 of the Internal Revenue Code to reallocate income between commonly controlled businesses if the reported arrangement doesn’t reflect what unrelated parties would agree to.13Office of the Law Revision Counsel. 26 USC 482 – Allocation of Income and Deductions Among Taxpayers In practice, that means the interest rate credited to each subsidiary on its contributed balance must be set at arm’s length, comparable to what an unrelated depositor would earn in a similar arrangement.14Internal Revenue Service. Transfer Pricing Banks can calculate daily interest ladders on the intercompany balances a ZBA generates, but responsibility for setting compliant rates and maintaining documentation falls on the corporate treasury and tax teams.