Cash Pooling and In-House Banking Explained

A multinational group with dozens of subsidiaries often ends up with a strange inefficiency: one entity is sitting on surplus cash earning little or nothing, while a sister entity in another country is drawing on an overdraft at a much higher rate. Cash pooling and in-house banking are the two main treasury structures groups use to fix exactly this problem, centralising cash management so the group's own liquidity does the work instead of relying on external bank facilities at every subsidiary.

What Is Cash Pooling?

Cash pooling concentrates the cash balances of multiple group entities, usually through accounts held at the same bank, so that surplus cash in one entity can fund a deficit in another without each subsidiary needing its own external borrowing. There are two main structural variants:

• Physical (zero-balance) pooling — actual cash is swept from participating accounts into a master account, typically overnight, leaving each subsidiary account at zero or a target balance. Intercompany loans are created to record the movements, since cash has genuinely moved between legal entities.
• Notional pooling — balances across participating accounts are mathematically offset for interest calculation purposes, without any actual transfer of funds between entities. The bank calculates net interest on the combined position, but each subsidiary retains its own actual cash balance.

Physical pooling gives the group genuine access to consolidated liquidity and is the more common structure globally, while notional pooling can be attractive where cross-border cash sweeping is legally restricted or where entities want to avoid creating intercompany loan positions, though it is less widely available than it once was as some jurisdictions and banks have scaled back notional pooling products.

What Is In-House Banking?

An in-house bank takes the cash pooling concept further: rather than just sweeping balances, the group sets up an internal treasury function (sometimes a dedicated legal entity) that acts as a bank to the rest of the group. Subsidiaries hold internal "accounts" with the in-house bank, which handles intercompany lending, manages the group's external banking relationships centrally, nets and settles intercompany trading balances, and can run centralised FX and interest rate hedging on behalf of the whole group rather than each entity hedging independently.

The in-house bank typically sits on top of a payment-on-behalf-of (POBO) and collection-on-behalf-of (COBO) structure, where the in-house bank makes and receives payments for subsidiaries directly, reducing the number of external bank accounts the group needs to maintain and giving treasury far greater visibility and control over group-wide cash positions.

Why Groups Build These Structures

The financial case is straightforward: borrowing externally while a sister entity holds idle cash wastes money on interest rate spread, and running dozens of separate banking relationships multiplies fees, FX costs, and operational complexity. Centralising cash management also gives group treasury much better visibility for forecasting, reduces reliance on external credit facilities, and strengthens the group's negotiating position with banks by concentrating banking relationships and volumes.

These structures also interact closely with intercompany netting arrangements, which reduce the number and value of intercompany payments that need to settle by offsetting what entities owe each other before cash actually moves — a natural complement to a pooling or in-house banking structure, since both are about minimising unnecessary cash movement across the group.

Tax and Transfer Pricing Considerations

Intercompany loans created through physical cash pooling need to be priced on arm's-length terms for transfer pricing purposes, meaning the interest charged between group entities has to reflect what unrelated parties would charge in similar circumstances. Tax authorities in a growing number of jurisdictions scrutinise cash pooling arrangements closely, particularly where a "pool leader" entity appears to be earning disproportionate margin simply for facilitating the pool rather than for any genuine treasury function performed. Thin capitalisation and interest deductibility rules can also be affected by how intercompany pooling loans are structured, so treasury and tax teams need to work together closely when designing or reviewing these structures.

The Role of Treasury Technology

Running cash pooling and in-house banking effectively at scale depends heavily on the underlying systems. A well-configured treasury management system automates the daily sweeps, calculates and books intercompany interest, tracks the resulting loan balances for each participating entity, and gives treasury real-time visibility over consolidated group cash positions rather than relying on manual spreadsheet consolidation. As groups grow more complex and add more entities and currencies to a pooling structure, the operational case for investing in proper treasury technology — rather than managing pooling manually through bank portals and spreadsheets — becomes increasingly difficult to ignore.

FAQ

What's the main difference between cash pooling and an in-house bank?
Cash pooling concentrates balances (physically or notionally) for interest optimisation, while an in-house bank is a broader internal treasury function that also handles intercompany lending, centralised payments, and group-wide hedging.

Does cash pooling work across currencies?
Cross-currency pooling is possible but adds complexity, typically requiring the bank to convert balances into a base currency, which introduces FX exposure that needs to be managed separately.

Why might a company use notional pooling instead of physical sweeping?
Notional pooling avoids creating intercompany loans and the associated transfer pricing and legal documentation burden, though it is less widely offered by banks than physical pooling and isn't available in every jurisdiction.

Treasury centralisation and cash management structures are core topics across Learnsignal's CPD course content for finance professionals working in corporate and group treasury.