Plain English
In a physical pool, money genuinely moves — every night, each subsidiary's account is swept to zero (or a target balance), with surplus cash physically transferred to a master account and deficits physically funded from it. That physical movement creates real, on-balance-sheet intercompany receivables and payables that need to be priced like any other short-term loan.
Technical definition
Physical cash pooling (zero-balancing or target-balancing) involves the actual daily transfer of funds between participant bank accounts and a central master account operated by the cash pool leader, creating genuine intercompany debtor and creditor positions requiring arm's length interest pricing under OECD Chapter X, distinguished from notional pooling where no legal transfer of funds occurs.
Why it matters
Because funds genuinely move and create real intercompany balances, physical pooling has the clearest need for daily-position-based interest pricing and is the structure most often re-tested for whether balances have become long-term in substance.
How it works in practice
- 01Each participant's account is swept to a target balance (often zero) at the end of each business day.
- 02Surplus balances flow into the master account; deficits are funded from it.
- 03The pool leader nets the group's overall position with the external bank.
- 04Daily intercompany receivable/payable balances accrue interest at agreed pool rates.
- 05Interest is calculated and settled periodically, typically monthly.
Worked example
Daily sweep mechanics
A subsidiary ends the day with EUR 2m surplus, automatically swept into the master account, creating a EUR 2m intercompany receivable from the pool leader. Another subsidiary ends the day EUR 1.5m short, automatically funded from the master account, creating a EUR 1.5m payable to the pool leader. Interest accrues daily: the lender-side subsidiary earns a deposit rate of 2.5%, the borrower-side subsidiary pays 3.5%, with the pool leader retaining the 100bps spread as compensation for the mechanical netting and any residual credit exposure it bears overnight.
Common mistakes
- Using a single flat interest rate for all participants regardless of whether they are net depositors or net borrowers.
- Not distinguishing overnight sweep balances from a participant that never has a positive balance, which suggests longer-term funding disguised as pooling.
- Failing to reconcile pool balances to bank statements at period end.
Audit red flags
- A participant permanently in deficit for the entire fiscal year.
- Sweep mechanics not automated, raising questions about whether transfers genuinely occurred daily.
- No agreement specifying the sweep target balance and timing.
Documentation & data
Documents to hold
- Cash pool agreement specifying sweep mechanics and target balances.
- Daily or monthly balance reports by participant.
- Interest calculation methodology and rate-setting policy.
Data you need
- Daily sweep transaction records.
- Bank account structure and master account details.
- Agreed deposit and borrowing rates for the pool.
Who owns this internally: Group treasury operations run the daily sweep mechanics; tax sets and monitors the interest rate policy.
Jurisdiction notes
- OECD
- Chapter X treats physical pooling balances as generally short-term in nature, warranting money-market-type rates rather than term-loan rates, absent evidence of persistent long-term positions.
- France/Germany
- Tax authorities in both jurisdictions have challenged physical pool interest spreads retained by pool leaders as excessive relative to their actual function.
Notes by role
Advisors & consultants
Pull the actual daily sweep data, not just month-end snapshots, when testing whether a participant's position is genuinely short-term.
In-house tax teams
Automate daily reconciliation between bank records and intercompany ledger entries to avoid disputes over whether sweeps actually occurred as documented.
Frequently asked
- Is physical pooling always preferable to notional pooling?
- No — the choice depends on banking relationships, regulatory constraints on cross-border cash movement, and cost; both are valid subject to proper pricing.
- How is interest typically settled?
- Usually monthly, based on accrued daily balances, though quarterly settlement is also common.
Sources & status
- Primary source
OECD Transfer Pricing Guidelines, Chapter X, paras 10.130–10.138
OECD, 2022
Reference material only, not advice on a specific fact pattern. Reviewed 2026-06-30.
Careers
How this shows up in the job
Being able to describe the operational mechanics of a physical sweep, not just its transfer pricing theory, is valued in treasury-facing tax roles.
Careers in transfer pricing