What is Correspondent Banking?

How it works

A bank in Paraguay can't have a direct account at every bank in the world. So when a Paraguayan customer needs to send USD to a small French bank, the message and money flow through a chain of correspondent relationships:

1. Originating bank (Paraguayan) sends a SWIFT MT103 message via its USD correspondent — typically a major US bank where the Paraguayan bank holds a USD nostro account.
2. The US correspondent settles the USD with its own correspondent in France (or directly with the destination bank if a relationship exists).
3. The French correspondent credits the destination bank's nostro account, which then credits the recipient.

Each hop adds:

• Fees (USD 25-75 per hop on traditional correspondent rails).
• Compliance checks (sanctions screening, AML, KYC verification).
• Settlement time (T+0 to T+3 depending on rails and time zones).

The structure dates back to the 19th century but has been reshaped dramatically since 2008 by de-risking, sanctions enforcement, and (more recently) FATCA / CRS reporting flows.

Nostro / vostro accounts

Two terms for the same thing seen from different sides:

• Nostro account ("ours" in Italian / Latin): an account a domestic bank holds at a foreign bank, denominated in foreign currency. The Paraguayan bank's USD account at JPMorgan in New York is its USD nostro.
• Vostro account ("yours"): an account a foreign bank holds at a domestic bank, denominated in the domestic currency. JPMorgan calls the same account a vostro account from its perspective.

The bookkeeping is symmetric — same balance, opposite labels. Modern banks maintain dozens or hundreds of nostro accounts across major currencies.

SWIFT and the message layer

SWIFT (Society for Worldwide Interbank Financial Telecommunication) is the messaging layer connecting ~11,000 financial institutions globally. SWIFT does not move money — it moves messages about money movements. The actual money settlement happens via the correspondent banking network.

Common SWIFT message types:

• MT103 — single customer credit transfer (cross-border wire).
• MT202 — bank-to-bank transfer (correspondent settlement).
• MT199 — free-format message (queries, advice).

In 2022-2025, SWIFT has been transitioning to ISO 20022 (MX) messaging with richer data fields and structured beneficiary information.

De-risking and the squeeze on small banks

Since 2008-2010, large US correspondent banks (JPMorgan, Citi, Bank of NY Mellon, BNP Paribas, etc.) have dropped thousands of foreign correspondent relationships with smaller, higher-risk banks. The drivers:

• Sanctions enforcement (BNP Paribas paid USD 8.9B in 2014 for Iran/Sudan-related violations — became a wake-up call).
• FATCA reporting burden on foreign correspondents.
• AML / KYC compliance costs outweighing thin correspondent margins.
• Reputational risk from any incident.

Result: Caribbean, sub-Saharan Africa, smaller Latin American banks lost USD correspondent access en masse. Banking USD remittances and trade flows now route through fewer, larger intermediaries — at higher cost and longer settlement.

Examples

• Paraguayan exporter receives USD payment from a small French bank. Funds route: French bank → French USD correspondent (BNP Paribas NY) → Paraguayan bank's USD correspondent (Citi NY) → Paraguayan bank → exporter's account. Total fees ~USD 60-100, settlement T+1 to T+2.
• Same exporter via Wise / Mercury (EMI). EMI uses local rails on each side (SEPA in France, ACH-equivalent in Paraguay where available). Fee ~USD 5-15, settlement same-day or T+1. The EMI handles the FX internally without traditional correspondent hops.

Common mistakes

• Assuming all banks have USD correspondents. Many smaller banks lost theirs to de-risking. Verify that your bank can actually receive USD wires from your counterparty's region.
• Quoting fees only at the originating end. Intermediary correspondent fees deducted en route can leave the recipient receiving 50-100 USD less than the originator sent.
• Ignoring sanctions screening delays. A wire that touches a sanctions-watched corridor (Iran, Russia, North Korea, Cuba, Venezuela, etc.) may be delayed or blocked entirely. Plan around the screening flow.
• Using EMIs as fully equivalent to correspondent-bank rails. EMIs are great for many use cases (fast, cheap, modern UX) — but they don't always integrate cleanly with high-volume institutional flows or sanctions-sensitive transactions.