A concentration account is a central corporate bank account that collects the combined balances from a company’s many subsidiary or regional accounts into a single pool, giving the treasury team one consolidated cash position to manage. Large companies use it as the backbone of cash management: scattered balances are swept in automatically, and the finance department can then invest overnight cash, pay down credit lines, or fund operations from one place instead of chasing dozens of account balances.
The mechanics are simple. The legal, tax, and compliance obligations around them are not.
How the Daily Sweep Works
Feeder accounts at each subsidiary or business unit stay open and keep handling local activity like customer collections and vendor payments. At the end of each business day, the bank’s systems execute pre-set electronic instructions that move cash between those feeder accounts and the master concentration account.
Two sweep structures dominate.
The Zero Balance Account, or ZBA, is the most common. Each feeder account is swept to exactly zero every day. Positive balances flow up to the concentration account; shortfalls are covered by funds flowing back down from the master. It is fully automated and needs no manual intervention.
A target balance sweep leaves a fixed cushion in the feeder account. The bank only pulls funds above a pre-set threshold. A subsidiary that needs $50,000 on hand for morning payroll would set that as its target and let anything above it move to the master.
Timing matters. Funds consolidated through an end-of-day sweep are generally available for same-day use inside the bank’s system, but the cut-off time varies by institution. Miss it and the cash doesn’t consolidate until the next business day, which can throw off overnight investment or debt paydown decisions.
Physical Pooling vs. Notional Pooling
When someone says “concentration account,” they almost always mean physical pooling: money actually moves from feeder accounts into the master. There is a separate arrangement called notional pooling, where no cash moves and the bank simply calculates interest on the combined net balance as though the accounts were pooled. Notional pooling sidesteps the intercompany loan documentation that physical pooling requires, but many U.S. banks don’t offer it, and it raises its own accounting and regulatory questions. If your structure moves cash, the rules below apply.
Intercompany Loan Documentation and Interest
Every time a sweep pulls cash from a subsidiary’s feeder account into the parent’s concentration account, it creates a legal obligation. The parent now owes the subsidiary money, and the IRS expects that debt to be treated like a loan between unrelated parties.
The authority is IRC Section 482, which gives the IRS broad power to reallocate income and deductions among commonly controlled businesses to prevent tax evasion or to reflect each entity’s income accurately.1Office of the Law Revision Counsel. 26 USC 482 In practice, every intercompany cash movement inside the pool should be covered by a formal intercompany loan agreement specifying interest rate, repayment terms, and maturity.
The interest rate must meet an arm’s length standard, meaning it reflects what an unrelated lender would charge under similar circumstances. Treasury Regulation Section 1.482-2(a) requires consideration of the loan amount, duration, collateral, borrower creditworthiness, and prevailing market rates.2eCFR. 26 CFR 1.482-2 – Determination of Taxable Income in Specific Situations
The Safe Harbor
Rather than benchmarking every short-term sweep, the regulations offer a safe harbor. An intercompany interest rate between 100% and 130% of the Applicable Federal Rate published monthly by the IRS is presumed arm’s length.2eCFR. 26 CFR 1.482-2 – Determination of Taxable Income in Specific Situations For short-term loans in early 2026, the AFR is approximately 3.59% to 3.63% annually, putting the safe harbor ceiling around 4.68% to 4.73%.3Internal Revenue Service. Rev. Rul. 2026-6 – Federal Rates for March 2026 AFRs change monthly, so treasury needs to track them continuously.
What Happens Without Documentation
If intercompany cash movements have no loan agreement or carry no interest, the IRS can impute interest income to the lending entity, creating a tax bill nobody planned for. Undocumented transfers can also be recharacterized entirely: as constructive dividends from a subsidiary to a parent, or as capital contributions the other direction. Either recharacterization changes the tax treatment sharply, and in cross-border structures it can trigger withholding obligations.
BSA/AML Compliance
Banks that maintain concentration accounts face specific scrutiny under the Bank Secrecy Act and anti-money-laundering rules. The concern is that when funds from many customers or entities flow through one pooled account, individual transaction details can get lost. The FFIEC’s BSA/AML Examination Manual warns that laundering risk arises when customer-identifying information such as names, transaction amounts, and account numbers becomes separated from the financial transaction itself.4Federal Financial Institutions Examination Council. BSA/AML Manual – Concentration Accounts
The FFIEC expects banks to keep customers away from the account entirely. Customers should not have direct access to concentration accounts or even know they exist. All customer transactions processed through the pool must still appear on the customer’s own statements, and the bank must retain complete transaction and customer-identifying information at every step. The bank is also expected to reconcile the account frequently, using someone independent from the transactions flowing through it, and to resolve discrepancies quickly.4Federal Financial Institutions Examination Council. BSA/AML Manual – Concentration Accounts
For the corporate treasury team, the practical implication is that your own systems must feed enough detail into the bank’s records to maintain that audit trail. A sweep instruction that moves $2.3 million from a subsidiary account without tagging the source isn’t only sloppy bookkeeping. It is a compliance gap that examiners are trained to look for.
Foreign Accounts and FBAR Reporting
When feeder accounts sit at foreign banks, a separate reporting duty applies. Any U.S. person with a financial interest in or signature authority over foreign financial accounts whose combined value exceeds $10,000 at any point in the calendar year must file a Report of Foreign Bank and Financial Accounts, or FBAR.5Internal Revenue Service. Report of Foreign Bank and Financial Accounts (FBAR) The threshold is aggregate, not per account, so a multinational sweeping across several countries can trip it easily.
The FBAR is due April 15 for the prior calendar year, with an automatic extension to October 15 that requires no separate request.5Internal Revenue Service. Report of Foreign Bank and Financial Accounts (FBAR) Supporting records, including account names, numbers, bank addresses, account types, and maximum annual values, must be kept for five years from the filing due date. Civil penalties are adjusted annually for inflation and can be substantial, particularly where violations are willful.
Setting the Structure Up
Start with the bank. Not every institution supports multi-entity ZBA structures or target balance sweeps across a large number of subsidiaries. Daily cut-off times and fee structures directly shape how much value the system delivers. Per-transaction sweep charges are standard and add up fast when dozens of accounts are being swept daily. Negotiate those fees upfront and audit them.
Before any sweeps begin, the legal framework must exist:
- Executed intercompany loan agreements covering the cash movements
- Board resolutions from participating subsidiaries authorizing them to join the pool
- A documented interest rate methodology inside the safe harbor
Skipping this to get the system running faster is exactly how companies build the undocumented intercompany positions that attract IRS attention later.
Ongoing Management
Most of the ongoing work is discipline. Accounting has to track the intercompany balances created by each day’s sweeps so the temporary loan positions post correctly on both the lending and borrowing entity’s books. When a subsidiary changes legal status, is acquired, or moves to a different banking relationship, the master sweep instructions and the underlying agreements need updating right away. Teams that treat setup as a one-time project rather than a live obligation usually find their compliance gaps only when auditors or examiners find them first.