Routing Number Explained: What It Is and When It Applies

What a routing number is

A routing number is a numeric code that identifies a financial institution inside a payment system. In the United States it is nine digits long and is also called an ABA number or routing transit number. It tells the clearing system which institution should send or receive the funds on behalf of a customer.

A routing number identifies the institution, not the account. A payment normally needs both pieces of information: the routing number to reach the correct bank, and the account number to reach the correct customer. One without the other will not complete a transfer.

In some countries the phrase is used loosely for any local bank identifier, and the length and format vary. The term spread through software, payroll forms, and transfer screens built for the United States, which is why Canadian users run into it on foreign websites.

What Canada uses instead of a routing number

Canada does not use routing numbers. A Canadian account is identified by three pieces of information: a three-digit institution number for the bank or financial institution, a five-digit transit number for the branch, and the account number itself. Cheques and bank statements typically show all three.

For an international wire, a SWIFT/BIC code identifies the institution. It is eight or eleven characters and is different from both a transit number and a routing number. Canada does not use IBAN, the account format used in many European and other countries.

This mismatch has practical consequences. A foreign employer, pension administrator, or tax authority that accepts only routing and account numbers may not be able to deposit directly into a Canadian account, so funds often arrive by wire or through a licensed money services business.

How the common identifiers compare

Each identifier answers a different question. Some point to an institution, some to a branch, and some to a specific account. Knowing which one a form is asking for prevents delays, returned payments, and avoidable fees.

The quickest check is the length and wording of the field. A field that asks for nine digits is almost certainly expecting a United States routing number. A field asking for a transit or branch number, combined with an institution number, is built for Canada.

Where the term appears in accounting, payroll, and personal finance

In accounting software, the routing number field usually exists because the product was designed for the United States market. If you are entering a Canadian account, you generally need the transit number, institution number, and account number rather than a routing number.

In payroll, a direct deposit form from a foreign employer may ask for a routing number. Canadian employers paying into Canadian accounts work with transit and institution numbers instead. If your payroll system mixes the two, deposits fail and payments bounce back.

In personal finance, the term turns up when you receive money from abroad, set up a transfer to a foreign account, or complete a direct deposit form for a foreign benefit. Some foreign payers can only send funds to accounts that have a local routing number, which may affect how your money reaches you.

Related terms: remittance, payment, and transfer

Remittance has two common meanings. In everyday use it means sending money, especially across a border. In accounting and tax, it means a payment submitted to settle an obligation, such as payroll deductions sent to the Canada Revenue Agency.

Payment, transfer, and remittance overlap but are not identical. A payment settles an amount owed. A transfer moves funds between accounts, often your own accounts at one or more institutions. A remittance is the act of sending funds, usually to another person, business, or authority, and often internationally.

A remittance advice is not money. It is a document or message telling the recipient which invoices or obligations a payment covers. Confusing an advice with a payment can leave a supplier or agency waiting for funds that were never sent.

Routing numbers fit inside these processes rather than describing them. They are one of the technical details you may need in order to complete a transfer, not a type of transfer in themselves.

Canadian examples in practice

Payroll remittance to the CRA: employers withhold income tax, Canada Pension Plan contributions, and Employment Insurance premiums from pay, then remit those amounts to the Canada Revenue Agency on a schedule the CRA sets based on the amount withheld. The remittance is a payment to a government authority, not a bank identifier.

Invoice remittance: a business pays a supplier's invoice and sends a remittance advice listing the invoices covered. This is domestic bookkeeping, and no routing number is needed if both parties bank in Canada.

International remittance: sending money to a person or business abroad. Here the exchange rate and fees matter as much as the identifiers. The Bank of Canada publishes daily exchange rates that providers and customers commonly reference, and licensed money services businesses in Canada are registered with FINTRAC.

Why the details matter

Using the wrong identifier can return a payment, delay it by days, or send funds to the wrong place. Returned transfers often come with fees charged by one or more institutions, and reversing a misdirected payment can take considerable time.

Fraud is a related risk. Requests to change banking details, especially by email, are a common pattern in payment-diversion fraud. Verify any change in account information through a phone number you already have, not one supplied in the message.

Tax and reporting rules can also apply. A Canadian resident who holds specified foreign property with a total cost above a set threshold at any time in the year may have to file a T1135 with their return, which is separate from the mechanics of moving money.

Common confusions

Most confusion comes from forms that were designed for one country being used in another. Reading the label and the expected length of the field resolves most of it.

When in doubt, ask the payer or recipient which identifier their system expects, and confirm the details in writing before sending a large amount.

• A routing number is not an account number; one identifies the institution, the other identifies the customer.
• A routing number is not a SWIFT/BIC code; the SWIFT code is used for international wires and works differently.
• A routing number is not a Canadian transit number; transit numbers are five digits and identify a branch.
• IBAN and routing numbers are not interchangeable; Canada does not use IBAN at all.
• Remittance and routing sound similar but mean unrelated things, one describes sending funds and the other identifies an institution.