Why Banks Must Rigorously Distinguish Cash and Foreign Exchange: Understanding the One-Character Difference

Since the end of 2024, major state‑owned banks such as ICBC, ABC, BOC and CCB have announced a “cash‑exchange same price” policy, eliminating the conversion spread for customers. The article argues that this does not erase the fundamental distinction between cash (现钞) and foreign exchange (现汇); understanding the underlying logic is crucial for banking technology, product and business design.

1. Official definitions

Foreign Exchange (现汇) : funds recorded as electronic vouchers, cross‑border remittances or foreign‑currency bills, with no physical cash flow. Includes inbound telegraphic transfers, documentary credits, foreign‑currency drafts, travel‑cheque collections, and overseas securities settlements. Funds enter the inter‑bank clearing chain and can be used for real‑time payments, cross‑border transfers and FX trading.

Cash (现钞) : physical foreign‑currency notes and coins that can only be deposited or withdrawn at a counter. The cash cannot directly participate in international clearing and must be accumulated in large batches before being transferred to overseas inter‑bank accounts.

2. Dimension comparison

Form : electronic numbers vs physical notes/coins.

Source path : inbound telegraphic transfer, draft, collection vs cash deposit, counter withdrawal.

Account label : FX account (汇户) vs cash account (钞户).

Core cost : near‑zero for FX (account transfer) vs transport, insurance, security and inventory management for cash.

3. Cost illustration

When a customer exchanges $1,000, the FX buy price might be 7.25 CNY/USD while the cash buy price is 7.18 CNY/USD, creating a spread of about 70 CNY. If the customer mistakenly converts cash to FX, the spread is lost and a “cash‑to‑FX” fee (typically 0.5%‑1%) may be triggered.

4. Why the distinction matters

Physical‑cost logic : cash requires storage in vaults, secure transport, insurance and handling (counting, authentication). These costs are reflected in a lower cash buy price.

Regulatory logic : cash is a high‑risk AML area because its source is hard to trace. Regulations impose stricter reporting thresholds for cash deposits/withdrawals (e.g., > $5,000 requires customs declaration, > $10,000 requires prior reporting to the foreign‑exchange bureau).

5. Accounting treatment

Banks maintain separate sub‑accounts: a “foreign‑exchange account” linked to the “foreign‑bank deposits” asset class for real‑time settlement, and a “cash account” linked to the “foreign‑currency cash inventory” asset class for tracking transport loss, storage cost and cash‑to‑FX conversion gains or losses. Merging the accounts would obscure profit calculation, distort financial statements and fail regulatory audits.

6. New “same‑price” trend

Construction Bank – Sep 2024 – merge cash and FX accounts, cancel conversion fee.

Bank of China – 11 Oct 2024 – 26 currencies at same price, unified buy/sell rates.

Industrial and Commercial Bank – Oct 2024 – eliminate cash/FX label at the account layer.

Agricultural Bank – 13 Dec 2024 – all currencies at same price, waive conversion spread.

These measures do not mean cash equals FX; banks simply absorb the physical‑cost component internally instead of passing it to customers.

7. Practical implications

Account layer : Some banks no longer show separate cash/FX labels to customers, but internal systems still record the nature of funds to satisfy AML reporting.

Regulatory layer : Cash deposit/withdrawal limits and documentation requirements remain unchanged.

Settlement layer : Physical transport and handling costs still exist; banks choose to bear them rather than charge customers.

Conclusion : Distinguishing “cash” from “foreign exchange” enables precise accounting of physical versus digital costs and fulfills regulatory risk controls. While “same‑price” policies may become widespread, understanding the underlying logic remains essential for banking professionals.