Back to back letter of credit explained

A back to back letter of credit is a second documentary credit issued in favour of a source supplier, supported commercially by a master credit already issued in favour of an intermediary trader. Two separate credits exist. The issuer of the second credit looks primarily to documents and proceeds under the master credit, while remaining independently bound under the back to back instrument.

The structure is used where the intermediary needs to pay a supplier and the master credit is not transferable, or where transfer under UCP 600 Article 38 is unavailable or unsuitable. Back to back issuance is market practice described in ICC materials. It is not a named credit type defined by a dedicated UCP 600 article in the same way transferable credits are defined in Article 38.

Back to back letter of credit structure

ICC Academy guidance states that back to back credits are commonly used by traders who act as middlemen between the source supplier and the final buyer. Two separate credits are issued:

• a master credit in favour of the middleman
• a back to back credit in favour of the source supplier

The terms and conditions of the back to back credit are likely to be similar to those of the master credit except for the credit amount, the unit price, the expiry date, the latest shipment date and the presentation period. Those differences protect the intermediary's margin and leave time for document handling between the two instruments.

The primary source of repayment for the issuer of the back to back credit is the proceeds expected from the master credit. Care is required because each bank may interpret terms and conditions differently, and documentary mismatches between the two credits can break the intended self liquidating sequence.

How the documentary chain works

The ICC Users Handbook describes the operational logic. Rather than advancing cash to the intermediary against an assignment of proceeds, a lender may issue a credit to the supplier. Under that back to back credit, the bank undertakes to pay the supplier if the supplier presents the key documents needed to satisfy the conditions of the original credit.

By requiring documents that align with the master credit's documentary conditions, the issuing bank of the back to back credit seeks assurance that, before it pays under the second credit, it will hold documents usable under the master credit. The closest practical alignment often requires the supplier to present all documents other than the intermediary's invoice. The supplier presents its own invoice under the back to back credit. After that credit is honoured, the intermediary substitutes its own invoice and completes the presentation under the master credit.

Differences between the two credits increase reliance on the intermediary. Shipping terms may differ, for example where the supplier contract is ex works and the buyer contract requires carriage and insurance paid. The more differences the bank allows, the more the bank depends on the intermediary to generate additional documents. The bank must still honour a complying presentation under the back to back credit regardless of whether the intermediary later completes the master credit presentation. Additional collateral from the beneficiary of the master credit may be required to secure the bank's reimbursement claim.

Risks that distinguish back to back from transfer

Transfer under a transferable letter of credit uses one credit made available to a second beneficiary under UCP 600 Article 38. Back to back practice creates a second independent undertaking. That independence is the central credit point.

Once the back to back credit is issued, the issuer is vulnerable to amendments to the master credit that cause its requirements to diverge from those of the second credit. Some issuers of back to back credits insist on confirmation of the master credit so that amendments require the confirmer's assent under UCP 600 Article 10. Confirmation does not remove documentary mismatch risk, but it can give the bank a formal role in amendment control.

Assignment of proceeds under UCP 600 Article 39 is a further alternative. Assignment reallocates proceeds without creating a second beneficiary's right to perform and without creating a second credit. Back to back issuance is chosen when the supplier needs its own bank undertaking rather than a claim to assigned proceeds.

Independence and complying presentation

Each credit remains an independent documentary undertaking when UCP 600 is incorporated. Banks examine documents against the credit they issued or confirmed. A complying presentation under the back to back credit obliges that issuer according to its own terms even if the master credit later fails on discrepancies, amendment disputes or applicant issues.

That separation is why back to back structures are credit intensive. The intended repayment path runs through master credit proceeds, but the legal obligation on the back to back issuer does not wait for those proceeds. Credit analysis therefore covers both instruments, the gap between their terms, the intermediary's capacity to substitute documents, and any security taken to cover a broken chain.

Export finance context

Back to back letters of credit belong to short term documentary trade finance. They sit beside supplier credit deferred payment terms and short cycle working capital needs of intermediaries.

They are not substitutes for medium term buyer credit supported by an export credit agency. UKEF describes its Buyer Credit Facility as a guarantee to a bank lending to an overseas buyer for capital goods, services or intangibles, with typical repayment of two years or longer, while the exporter is paid as under a cash contract. That structure finances the buyer over time. A back to back credit finances a supplier presentation under a second short term documentary instrument.

Both may appear around related commercial flows, but they allocate risk differently. Back to back risk is documentary and intermediary performance risk across two credits. Buyer credit guarantee risk is loan non payment risk on an overseas borrower under official support terms.

Credit desk reading

For credit and trade desks, a back to back letter of credit file identifies the master credit and the second credit, maps permitted differences in amount, price and dates, tests whether documents from the supplier can support the master presentation after invoice substitution, and records amendment controls, confirmation status and any collateral supporting the second issuance.

The structure is definitional market practice built from two independent credits. It should not be described as a transferable credit unless the master credit specifically states that it is transferable and is transferred under Article 38. Transfer and back to back are alternative techniques for paying upstream suppliers, with different undertakings and different failure modes.