Your checking account holds $40,000 earning next to nothing while your business line of credit charges you 9% on a $25,000 draw — at the same bank, on the same day, on what is effectively the same money. If you run multiple accounts across locations, entities, or purposes, this quiet leak is probably happening to you right now. Cash concentration and notional pooling are the two professional techniques for stopping it, and the small-business version of the first one is simpler — and cheaper — than you think.
The Problem: One Business, Many Balances, Zero Coordination
The moment a business outgrows a single checking account, cash starts fragmenting. A retail shop adds a second location with its own operating account. A contractor opens a separate payroll account so wages never compete with vendor payments. An online seller collects marketplace payouts in one account while inventory purchases drain another.
Each account then gets managed in isolation:
- Idle balances earn nothing. Operating accounts typically pay little or no interest, yet businesses keep large cushions in each one "just in case."
- Shortfalls trigger borrowing. One account dips toward zero, so you draw on a credit line — while a sister account sits on a surplus that could have covered the gap.
- Visibility disappears. With money scattered across five logins, nobody can answer the simplest treasury question: how much cash do we actually have right now?
The result is the worst of both worlds: you are simultaneously cash-rich and cash-poor. Banks even have a name for the spread you pay — borrowing at 8–10% while your own deposits earn near zero is pure margin for them. Both techniques below exist to collapse those scattered balances into one usable position.
Cash Concentration: Physically Moving Money Where It Counts
Cash concentration, also called physical pooling, does exactly what the name says: at the end of each business day, funds are physically transferred from subsidiary accounts into one central concentration account. Money moves. Balances change. One account ends up holding the combined cash.
How it works day to day
A typical setup has one master (concentration) account and several sub-accounts — by location, function, or entity. Two mechanics do the heavy lifting:
- Zero-balance accounts (ZBAs). Each sub-account starts and ends the day at exactly zero. When the payroll account needs to clear $18,000 in paychecks, the master account funds it with precisely $18,000. When the store account receives $6,200 in card deposits, that money is swept up to the master account overnight. The sub-accounts exist for tracking and control, but all the cash lives in one place.
- Target-balance sweeps. Instead of zeroing out, each sub-account keeps a fixed cushion — say $5,000 — and only the excess above that target is swept to the center. This suits accounts with unpredictable intraday activity where a zero start could cause an overdraft before the funding transfer lands.
Sweeps run automatically once configured with your bank. You set the hierarchy, the targets, and the timing; the bank's system executes the transfers every business day without anyone logging in.
Why businesses choose it
- Interest savings are immediate and concrete. If one location is $20,000 overdrawn and another holds $20,000 idle, concentration nets them to zero — the overdraft (and its interest) simply vanishes.
- Surplus cash becomes investable. Ten accounts each holding a $10,000 cushion tie up $100,000. Concentrated, you might need only a $25,000 central cushion, freeing $75,000 for a money-market sweep, a loan paydown, or operations.
- Fraud control improves. Disbursement accounts that begin each day at zero make unauthorized transactions stand out: any unexpected balance or presentment is an instant red flag.
- Reconciliation gets simpler. One master balance to watch daily, with sub-account activity cleanly separated by purpose.
The costs and catches
Concentration is not free. Banks typically charge monthly maintenance per account in the structure plus per-transfer sweep fees, so a five-account setup might cost $50–$200 per month before it saves you a dime — the math only works once idle balances or avoided borrowing exceed that. Same-day funding also depends on transfer timing: if a large check posts before the morning funding sweep arrives, you can still trip an overdraft. And when sub-accounts belong to different legal entities, every sweep is legally an intercompany loan, which brings documentation and tax duties (more on that below).
Notional Pooling: The Offset Without the Movement
Notional pooling achieves a similar economic result with no money movement at all. The bank leaves every balance exactly where it is, then calculates interest on the combined net position of all accounts in the pool — as if the funds had been merged.
Concretely: Account A holds +$100,000, Account B sits at -$60,000. Instead of charging overdraft interest on the -$60,000 and paying deposit interest on the +$100,000 separately, the bank computes interest on the net +$40,000. You stop paying to borrow your own money, and not a dollar changes accounts.
Why it appeals — and why you probably cannot get it
Notional pooling preserves each account's standalone balance, which matters when different subsidiaries need clean, unmoved cash positions for local reporting, regulatory, or currency reasons. It also avoids the daily transfer traffic and the intercompany-loan paperwork that physical sweeps between entities create, since nothing technically moves (though tax authorities in several countries have disagreed — see below).
The catch is availability. Notional pooling is overwhelmingly a large-corporate, often multinational product:
- Few banks offer it domestically. In the United States, regulatory constraints mean most banks simply do not provide notional pooling to small or mid-sized businesses. It is far more common in Europe.
- Minimums and complexity are enterprise-grade. Pools typically span entities and currencies, require cross-guarantees between participants, and come with treasury-management pricing aimed at companies with dedicated finance teams.
- The tax treatment is contested. Because no funds move, some companies treated pool positions as having no tax consequences — until authorities in several European countries recharacterized the balances as intercompany loans anyway, complete with transfer-pricing adjustments.
For a small or mid-sized business reading this, notional pooling is worth understanding so you can follow the conversation — but cash concentration (in its small-business form, the sweep account) is almost certainly the tool you will actually use.
Head to Head: Which Fits Your Business?
| Cash concentration (physical) | Notional pooling | |
|---|---|---|
| Money moves? | Yes — daily sweeps into a master account | No — balances stay put |
| Interest benefit | Real: deficits funded by surpluses | Calculated on the net position |
| Small-business availability | Widely available as sweep/ZBA accounts | Rarely offered below enterprise scale |
| Bank fees | Per-account + per-sweep charges | Treasury-management pricing |
| Multi-entity paperwork | Each sweep is an intercompany loan | Disputed — some authorities treat it as one anyway |
| Best for | Multi-account businesses wanting one usable balance | Multinationals with multi-currency, multi-entity pools |
If all your accounts belong to a single legal entity, the choice is easy: concentration gives you nearly all the benefit with none of the exotic tax risk. The multi-entity case is where professional advice earns its fee either way.
The Small-Business Version: Sweep Accounts You Can Open This Month
You do not need a treasury department to concentrate cash. Most business banks sell exactly this as sweep accounts or zero-balance account packages aimed at small and mid-sized companies:
- Start with the structure you already have. List every business account, its average balance, and its purpose. Flag any account that routinely holds more than two weeks of its own outflows — that cushion is your recoverable idle cash.
- Ask your bank for three numbers. The monthly fee per account in a sweep structure, the per-transfer sweep fee, and the interest rate (or earnings-credit rate) on the master account. Multiply the fees by twelve and compare against the interest you would save by netting your average idle balances against your average borrowing.
- Designate one master account. Usually your main operating account. Everything else becomes a funded sub-account: payroll, each location, tax reserves, marketplace collections.
- Pick zero-balance or target-balance per account. Payroll and payables accounts with predictable batch outflows suit zero-balance treatment. Accounts receiving unpredictable deposits — card settlements, marketplace payouts — are safer with a modest target balance so a surprise debit never bounces.
- Revisit quarterly. Sweep structures drift: locations close, volumes shift, and a $5,000 target set two years ago may now be far too large or dangerously small.
A realistic small-business win looks like this: three location accounts averaging $12,000 each in cushions ($36,000 idle) plus a $20,000 average line-of-credit draw at 9%. Concentrating to a single $10,000 central cushion frees $26,000 — enough to clear the credit line entirely, saving roughly $1,800 a year in interest for perhaps $1,200 a year in sweep fees. The bigger prize, though, is permanent: one balance to watch, one decision about what to do with surplus cash.
The Tax and Bookkeeping Traps (Read Before You Sweep)
Concentration is simple operationally and surprisingly prickly on paper. Three issues deserve attention:
Sweeps between entities are loans, not transfers
When the master account and a sub-account belong to different legal entities — a parent and a subsidiary, or two sister LLCs — every sweep creates an intercompany loan. Tax authorities expect these to look like real loans: written terms, a stated interest rate, and actual interest settlement. Pricing the rate is the dangerous part. Set it below market and the IRS can recharacterize the arrangement as profit shifting and adjust your taxable income; guidance on affiliate lending has made clear that the borrower's group membership counts when judging what rate is arm's-length. Keep a simple intercompany loan ledger, accrue interest at a defensible rate, and settle it — if the balances only ever grow in one direction, you have a capital contribution wearing a loan costume, and auditors notice.
Single-entity sweeps still need clean books
Even when all accounts belong to one company, each sweep is a real bank transfer that must appear in your books. The failure mode is recording only the economic substance ("payroll paid $18,000") while the funding transfer in and the sweep-out never get journaled. Months later the bank reconciliation breaks and nobody can explain the master account's balance. Record every leg: the sub-account receipt, the sweep to master, the funding back down, the final payment. Four movements, four entries.
Track it by account, not just in total
Concentration gives you one economic position but your bank statements still show several legal balances. Your chart of accounts should mirror reality: one cash account per bank account, with the sweep transfers recorded as transfers between them — never netted into a single "cash" line. If you ever need to prove which entity held what on a given date, the per-account trail is the evidence.
This is where plain-text accounting earns its keep: every sweep is a readable, reviewable transaction line, and generating a per-account cash report is a query away rather than a spreadsheet project. Tools with a clear dashboard view of all balances at once, like Fava's balance sheet reports, make the daily "how much cash do we actually have" check take seconds.
Keep Your Surplus Working, Not Sitting
Idle cash scattered across accounts is a silent expense — you pay borrowing costs on money you already own while surpluses earn nothing a few logins away. Cash concentration fixes it by sweeping every balance into one usable position daily, and its small-business form, the sweep account, is available from most business banks for a modest monthly fee. Notional pooling offers the same economics without moving funds, but it remains an enterprise product most smaller businesses cannot buy.
Maintaining that single clear picture of your cash is ultimately a bookkeeping discipline: every sweep journaled, every account reconciled, every intercompany balance documented. Beancount.io provides plain-text accounting that gives you complete transparency and control over your financial data — no black boxes, no vendor lock-in. Get started for free and see why developers and finance professionals are switching to plain-text accounting.
