A concentration account is a master bank account that collects and holds the combined balances from a company’s many subsidiary or regional accounts in one place. Large corporations use it as the backbone of cash management: scattered balances across business units get swept into a single pool each day so the treasury team can see one number and deploy that cash immediately. The mechanics are straightforward. The legal, tax, and compliance obligations that come with running one are where the work actually lives.
How the Hub-and-Spoke Structure Works
Picture a hub with spokes. The concentration account is the hub. The subsidiary or regional bank accounts are the spokes, usually called feeder accounts. Those feeders stay open and keep handling local activity, collecting customer payments and paying vendors. At the end of each business day, excess cash in the feeders moves automatically into the master account.
The payoff is visibility. Instead of monitoring dozens or hundreds of balances across business units and geographies, the finance department focuses on a single consolidated position. That makes short-term forecasting more reliable and lets idle cash go to work overnight, whether by investing it, paying down a revolving credit line, or funding operations in another part of the business.
Money actually moves in a concentration structure. That is called physical pooling, and in the United States it is almost always what people mean when they say “concentration account.” A separate approach called notional pooling calculates interest on a combined net balance without moving any cash, but many U.S. banks do not offer it, and it raises its own balance sheet netting questions.
Sweep Mechanics: ZBAs and Target Balances
The automated transfer of cash from feeders into the master account is called a sweep. Banks execute sweeps on pre-set electronic instructions, usually at end of day. Two structures dominate.
The most common is the Zero Balance Account, or ZBA. Each feeder is swept to exactly zero every day. A positive balance moves up to the concentration account; a shortfall gets funded from the master account back down. No manual intervention is needed.
The second is a target balance sweep. The bank pulls only what exceeds a pre-set threshold, leaving a cushion in the feeder to cover expected next-day activity. A subsidiary that needs $50,000 on hand for morning payroll might set that as its target.
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 does not consolidate until the next business day, which can throw off overnight investment or debt paydown decisions.
Intercompany Loans and Arm’s-Length Interest
When a sweep pulls cash from a subsidiary’s feeder account into a parent company’s concentration account, that transfer is not just an accounting entry. It creates a legal obligation. The parent now owes the subsidiary money, and the IRS expects that debt to be treated as a real loan between unrelated parties.
The statutory 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 accurately reflect each entity’s income.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 matches what an unrelated lender would charge in similar circumstances. Treasury Regulation Section 1.482-2(a) requires consideration of the loan amount, duration, collateral, the borrower’s creditworthiness, and prevailing market rates.2eCFR. 26 CFR 1.482-2 – Determination of Taxable Income in Specific Situations
The Safe Harbor Range
The regulations provide a safe harbor so companies do not need a full benchmarking study for every short-term sweep. An intercompany rate falling 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 The AFR changes monthly, so treasury teams need to track it continuously.
What Happens Without Proper Documentation
If sweeps lack formal loan agreements or carry no interest, the IRS can impute interest income to the lending entity and create a tax liability where none was expected. Undocumented transfers also risk being recharacterized entirely, as constructive dividends from a subsidiary to a parent, or as capital contributions in the other direction. Either recharacterization changes the tax treatment dramatically and can trigger withholding obligations in cross-border structures.
BSA/AML Audit Trail Requirements
Banks that maintain concentration accounts face specific scrutiny under the Bank Secrecy Act and anti-money-laundering rules, and the corporate treasury side has to feed those controls. The concern is that when funds from many different entities flow through a single pooled account, individual transaction details can get lost. The FFIEC’s BSA/AML Examination Manual warns that money laundering risk arises in concentration accounts when customer-identifying information like 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 a comprehensive system identifying all general ledger accounts used as concentration accounts and the departments and individuals authorized to use them. Customers must not have direct access to the account or know it exists. All customer transactions processed through it must still appear on the customer’s own account statements, and the bank must retain complete transaction and identifying information at every step.4Federal Financial Institutions Examination Council. BSA/AML Manual – Concentration Accounts Examiners also expect frequent reconciliation by someone independent of the transactions, with a timely process for resolving discrepancies.
For a corporate treasurer, this translates into a straightforward obligation: the company’s own systems need to feed enough detail into the bank’s records to maintain the audit trail. A sweep instruction that moves $2.3 million from a subsidiary account without tagging the source is a compliance gap that examiners are specifically trained to look for.
Foreign Accounts and the FBAR Trigger
If the structure includes feeder accounts at foreign banks, a separate reporting duty attaches. 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 during the calendar year must file a Report of Foreign Bank and Financial Accounts, known as an FBAR.5Internal Revenue Service. Report of Foreign Bank and Financial Accounts (FBAR) The threshold is aggregate, not per account, so a multinational sweeping cash across several countries can trip it easily.
The FBAR is due April 15 following the calendar year reported, 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 for non-filing are adjusted annually for inflation and can be substantial, particularly for willful violations.
Setting Up and Managing the System
The first decision is the banking partner. Not every bank supports multi-entity ZBA structures or target balance sweeps across a large number of subsidiaries, and the bank’s daily cut-off times and fee structure determine how much value the system actually delivers. Per-transaction sweep charges are standard and add up quickly across dozens of daily sweeps. Negotiating them upfront and auditing them periodically is one of the less glamorous but more consequential parts of treasury management.
Before any sweeps begin, the legal framework has to be in place: executed intercompany loan agreements covering the cash movements, board resolutions from participating subsidiaries authorizing them to join the pool, and a documented interest rate methodology that sits inside the safe harbor range. Skipping this step to get the system running faster is how companies create the undocumented intercompany positions that draw IRS attention later.
Ongoing management is mostly discipline. Accounting must track the intercompany balances created by each day’s sweeps so the temporary loan positions appear correctly on both the lending and borrowing entity’s books. When a subsidiary changes legal status, is acquired, or shifts banking relationships, the sweep instructions and underlying agreements need immediate updating. Teams that treat the initial setup as a one-time project usually discover their compliance gaps only when auditors or examiners find them first.
Since LIBOR was retired, most corporate treasury operations now reference the Secured Overnight Financing Rate (SOFR) for pricing variable-rate components of concentration account arrangements. The CME Term SOFR, endorsed by the Federal Reserve’s Alternative Reference Rates Committee, provides forward-looking rate estimates across one-month, three-month, six-month, and twelve-month periods. Legacy LIBOR references in intercompany agreements should be updated to remove ambiguity about how interest is calculated.