IBAN, SWIFT/BIC and Routing Numbers for US LLC payments

Understand what each banking code identifies, when to use ACH, SEPA or a wire, and how a US LLC can issue clear payment instructions in USD and EUR.

IBAN, SWIFT/BIC, routing number and account number are not four names for the same thing. Each identifies a different part of a payment: the account, the financial institution or the domestic route. An international LLC collects with less friction when it gives the payer only the instructions required by the currency, country and payment rail involved.

A US ACH payment will normally use a routing number and an account number. A euro transfer through SEPA is generally addressed with an IBAN. An international wire may require a SWIFT/BIC, beneficiary account and sometimes an intermediary bank. Sending every code at once does not make a payment safer; it can put it on the wrong route.

The difference at a glance

The first principle is simple: an identifier is not a payment rail. An IBAN is not SEPA, a BIC is not a wire and a routing number is not ACH. They are details used by a payment system to locate an institution or account.

Routing number: the nine-digit US bank code

The ABA routing number, also called a routing transit number or RTN, is a nine-digit code identifying a financial institution within the US payment system. The American Bankers Association maintains the routing-number policy, and the official registry records which clearing attributes apply to each number.

A routing number may be enabled for ACH, wire or cheque processing. One institution may use the same number for several rails or provide different numbers. That is why a business should not copy the number from a cheque, find it through an online search or assume that its ACH routing number also works for a wire. The valid detail is the one shown in the account's current instructions for that specific payment type.

Routing number and account number work together

The routing number takes the payment to the institution. The account number identifies the customer's account inside it. Two companies banking with the same institution can share a routing number while having different account numbers.

For an LLC receiving an ACH credit, the payment instructions will generally include:

• the beneficiary's exact legal name;
• the ACH-enabled routing number;
• the account number;
• the account type when the form requests it;
• the invoice or contract reference.

Domestic wire instructions can use another routing number, beneficiary format or reference field. Use the dedicated “domestic wire instructions” block rather than rebuilding it from ACH details.

SWIFT and BIC: the institution in an international payment

SWIFT is the cooperative network through which financial institutions exchange standardised messages. A BIC is the business identifier used within that environment. In everyday banking, “SWIFT code” and “BIC” normally refer to the same 8- or 11-character identifier.

Its structure is useful:

• four characters identify the institution;
• two identify the country;
• two complete the location suffix;
• an optional final three identify a branch.

A BIC identifies the institution or branch; it does not, on its own, identify the LLC's account. The payment may also require the beneficiary name, account number or IBAN, bank address, currency, purpose and an intermediary institution.

SWIFT is messaging, not the money itself

People often say that money “travels through SWIFT”. More precisely, the institutions exchange the payment instructions through SWIFT while settlement occurs through accounts and banking arrangements. That distinction explains why an international wire can involve a beneficiary bank, correspondent bank and intermediary without creating three separate accounts for the customer.

If an incoming international wire fails, the cause may be a mismatch in the beneficiary name, an unsupported currency, a missing intermediary, a compliance review or a wrong account detail. A valid BIC alone cannot correct the rest of the instruction.

IBAN: the standardised account identifier

The International Bank Account Number follows ISO 13616. Its length and composition are defined by each participating country within a common structure: country code, check digits and a national account component. The maximum length is 34 characters, but an IBAN from a particular country has a fixed national length.

An IBAN identifies an account; it does not prove whether the provider is a bank, electronic-money institution or another regulated institution, nor what protection applies to the balance. Those questions must be checked separately in the account agreement and provider disclosures.

The United States does not use IBAN for domestic accounts

A conventional US account uses routing and account numbers for domestic payments. If a European customer asks a US LLC for an IBAN, there are two clean options:

1. provide the LLC's international USD wire instructions if the customer can send the appropriate wire; or
2. provide a genuine EUR IBAN held or assigned to the LLC through an eligible provider.

Inventing an IBAN, adding “US” to an account number or entering a SWIFT code in an IBAN field will not work.

Can a US LLC have a European IBAN?

Yes. The relevant question is not whether the company was formed in Wyoming, Delaware, Florida or New Mexico. It is whether the bank, EMI or payment provider accepts that company, assigns EUR details to it and supports the intended operation.

Before using an IBAN, confirm:

• the exact account holder shown in the instructions;
• the legal entity providing the account or payment service;
• whether the LLC can receive and hold EUR;
• whether incoming and outgoing SEPA transfers are supported;
• any country, sector, amount or counterparty restrictions;
• how the funds are safeguarded or protected;
• whether statements are issued in the LLC's name;
• the conversion route if funds will later move to USD.

An IBAN is commercially valuable when European clients can pay locally in euros while the US account remains available for ACH, cards and domestic wires. It is one layer of a banking architecture, not a substitute for one.

For the dedicated analysis, see Can a US LLC have a European IBAN and collect in euros?.

SEPA, ACH, Fedwire and SWIFT are different rails

Payment details become easier to understand when the identifier is separated from the rail.

SEPA

SEPA harmonises euro credit transfers and direct debits across participating countries. The IBAN is the key account identifier. For payments covered by Regulation (EU) 260/2012, the IBAN-only rule means the provider must not require the user to supply a BIC. Institutions obtain that detail themselves.

ACH

ACH is the US batch network for credit and debit entries. It uses a routing number and account number, and it has rules, processing windows, returns and authorisation requirements. A routing number does not establish that a payment is final or that the beneficiary can accept every ACH entry.

Fedwire

Fedwire Funds Service is the Federal Reserve's real-time gross settlement system for participating institutions. Once processed, transfers are immediate, final and irrevocable between participating institutions. Customer access, cut-off times and review processes still depend on the financial institution.

SWIFT and international wires

SWIFT standardises the messages used by institutions. Settlement can involve correspondent accounts, local real-time systems or other arrangements. An international wire may therefore require a BIC, beneficiary account and intermediary instructions.

Our detailed comparison of timing and payment states is in ACH vs wire transfer for an LLC.

Which details should an LLC give in each situation?

A US customer paying in USD by ACH

Give:

• the LLC's exact legal name;
• ACH routing number;
• account number;
• account type if requested;
• a clear invoice reference.

Do not add an IBAN or SWIFT code unless the bank's own instructions require it.

A US customer sending a domestic wire

Provide the current domestic wire details:

• beneficiary legal name;
• bank name;
• wire routing number;
• account number;
• beneficiary address if requested;
• payment reference.

Do not assume that the ACH routing number is interchangeable.

A European customer paying in EUR through SEPA

Give:

• account holder name as shown by the EUR provider;
• IBAN;
• currency EUR;
• invoice reference.

The invoice currency and the payment instruction should agree. If the commercial price is in EUR, the customer should not have to infer a USD amount from an informal exchange rate.

A customer sending an international USD wire

Give the complete incoming international-wire instruction supplied by the account provider:

• beneficiary and account number;
• beneficiary bank and BIC;
• intermediary or correspondent bank, if specified;
• required addresses;
• currency and reference;
• any “for further credit” field exactly as written.

If an intermediary is part of the route, omitting it can delay or return the payment. The full guide is available in International wires for an LLC: intermediary banks and exact instructions.

The LLC paying a supplier abroad

Ask the supplier for one complete block of instructions and confirm:

• beneficiary legal name;
• beneficiary country and address when required;
• account or IBAN;
• BIC/SWIFT;
• currency;
• intermediary details;
• invoice number and payment purpose.

The payer should not “correct” a foreign account format without the beneficiary confirming the change.

Beneficiary, beneficiary bank and intermediary bank

These three layers are often confused:

• Beneficiary: the person or company receiving the economic value.
• Beneficiary bank: the institution holding or servicing the destination account.
• Intermediary bank: an institution that connects the sender's bank with the beneficiary bank when there is no direct route or a currency requires it.

An intermediary bank does not become the beneficial owner of the funds. It performs a routing or settlement role. If the provider supplies intermediary instructions, copy them exactly.

Two invoices, two currencies and the same LLC

Suppose your LLC invoices a Spanish customer for EUR 1,800 and a US customer for USD 2,000. These are illustrative amounts, not Exentax fees. Both invoices belong to the same company, but each customer needs the right set of payment details.

The Spanish customer sends the agreed euros to the EUR account. The US customer instructs an ACH Credit in dollars; your LLC does not debit their account. If the EUR account supports holding a balance, you can use it for euro expenses and make a separate decision about converting funds.

What if the customer can only see an IBAN field?

Check the currency and transfer type selected first. A SEPA form cannot send an ACH payment to the United States. To pay USD, the customer needs the international or US transfer option matching the receiving instructions. If you agree on EUR instead, provide the LLC's actual EUR details, not an IBAN constructed from its routing number.

Agree on the exchange rate and responsibility for fees before changing currencies. An account number does not establish the converted amount that settles an invoice. Where instructions include “for further credit”, retain the reference needed to allocate funds to the final beneficiary.

Exentax helps you choose accounts and collection methods around your customers and suppliers. We prepare the documentation and support account applications so that the structure serves your everyday business.

Design my banking structure

Fraud controls when bank details change

Payment-detail fraud often exploits a real invoice or email thread and replaces the beneficiary account. A professional process should include:

• sending instructions from a known company domain;
• avoiding unexpected changes inside a forwarded thread;
• confirming a new account through an independent channel;
• checking that the beneficiary name matches the contract and invoice;
• using a small test payment when justified;
• limiting access to full bank details;
• recording when and why instructions changed.

The payer should never rely only on a message saying “our bank details have changed”. Independent confirmation protects both sides.

Common mistakes and the correct response

Using an ACH routing number for a wire

Use the account's wire instructions. The number may be the same or different, but the provider decides that, not the sender.

Treating SWIFT/BIC as the account number

The BIC identifies the institution. Add the beneficiary account or IBAN required by the instructions.

Giving personal details for a company invoice

If the invoice is issued by the LLC, the beneficiary should normally match the LLC's account title. Personal and company collection routes should not be mixed casually.

Receiving a currency the account does not support

Confirm the receiving currency before issuing instructions. Conversion or rejection rules vary by provider.

Omitting the intermediary bank

If the provider's international-wire block includes one, send it. Do not remove fields because they look repetitive.

Publishing live bank details on a website

Provide payment details to the relevant counterparty through a controlled document, invoice or secure channel. Public exposure creates unnecessary fraud and privacy risk.

How to validate details before a material payment

1. Obtain the instructions from the authenticated account area or a current official document.
2. Check that the account holder matches the contracting LLC.
3. Choose the exact rail and currency.
4. Validate the routing number, IBAN length and BIC structure without treating format as proof of ownership.
5. Confirm intermediary fields and addresses.
6. Use the invoice number as the reference.
7. Confirm changed details independently.
8. Keep the payment confirmation and final statement.

An online validator can catch a malformed IBAN or routing number. It cannot prove that the account belongs to the intended beneficiary or accepts the planned payment.

Practical questions about IBAN, SWIFT and routing numbers

Does an international transfer always need both IBAN and SWIFT?

No. A SEPA transfer can often be initiated with the IBAN alone. An international wire can use SWIFT/BIC plus another account identifier. Follow the provider's exact instructions.

Is a routing number unique to my LLC?

Usually not. It identifies the institution and route; the account number identifies the LLC's account within it.

Can a provider assign a European IBAN to my LLC?

Yes, where an eligible provider opens or assigns a EUR account to the LLC. Review account ownership, provider entity, SEPA capability, safeguarding and statements.

Is the IBAN enough for a SEPA transfer?

Yes: the IBAN-only rule removes the requirement to supply a BIC for payments covered by Regulation (EU) 260/2012. The payer still needs the beneficiary name, amount and relevant reference.

Why does my account show two routing numbers?

The provider may route ACH and wires differently. This is not universal, but any distinction shown in the account instructions must be respected.

Can one LLC receive EUR and USD?

Yes. A banking architecture can combine USD and EUR details under the same company as long as each provider accepts the LLC and invoices, currencies, ownership and records remain coherent.

What does Exentax design?

We structure accounts, currencies, ACH, SEPA, wires and payment processors around the business model. The objective is a clear payment route for the customer, the correct receiving account for the LLC and operational continuity if one provider changes.

Bank details ready for business

Products, limits, fees and supported countries change between providers. Always confirm the live instructions for the specific account before using them.