Cross-Border Money Transfer Terminology Explained in Plain English
The terms on a wire transfer form are not designed to be understood quickly — here is what each one actually means.
Where a rule depends on where you live or are tax-resident, the country is named in the sentence.
Cross-border money transfer terminology explained in plain English is overdue, because the forms and confirmation screens involved in sending money internationally are full of terms that sound more complicated than the ideas behind them actually are. Here is what the common ones mean, without the jargon.
Mid-market rate
The mid-market rate is the midpoint between the buy and sell price of a currency pair at a given moment — effectively the "real" exchange rate you'd see quoted on a financial news site, before any bank or transfer service adds its own margin. No consumer transfer actually happens exactly at the mid-market rate; every provider adds some markup. The size of that markup is the spread, covered next.
Spread (or margin)
The spread is the difference between the mid-market rate and the rate a provider actually gives you, expressed as a percentage. It is explained in full in our FX spread guide, but the short definition: it is the main way most providers make money on a transfer, and it is usually a bigger cost than any stated flat fee.
SWIFT and SWIFT/BIC codes
SWIFT (the Society for Worldwide Interbank Financial Telecommunication) is a global messaging network banks use to instruct each other to move money — it does not move the money itself, it moves the instructions. A SWIFT code (also called a BIC, or Bank Identifier Code) is an 8-11 character code that identifies a specific bank and branch, similar to how a postal address identifies a building. You need your recipient's correct SWIFT code for a bank wire to reach the right institution.
IBAN
An International Bank Account Number, or IBAN, is a standardized account number format used by most European countries and a growing number of others, designed to reduce errors in international transfers by encoding the country, bank and account number into one checksummed string. The United States does not use IBANs for domestic accounts — US banks are instead identified by a routing number and account number — which is a common source of confusion when a form asks a US sender for an IBAN they do not have.
Correspondent banking
When two banks in different countries do not have a direct relationship with each other, they route the transfer through one or more intermediary "correspondent" banks that do have relationships with both. This is why a wire transfer can sometimes take longer, or arrive with a smaller amount than expected — each correspondent bank in the chain can deduct its own handling fee before passing the transfer along, and this typically happens outside the sender's visibility or control.
Purpose of transfer / purpose code
Many countries require senders or recipients to state why a transfer is being made — for example, "family support," "property purchase," or "business payment" — sometimes using a specific numeric code. This is a regulatory requirement in the destination country, used for statistical and anti-money-laundering purposes, and giving an inaccurate purpose code can delay or block a transfer even when the transfer itself is entirely legitimate.
Remittance
A remittance is simply money sent, typically by a person working abroad, back to family or dependents in their home country. It's a term used throughout the money transfer industry and in government statistics — the same underlying mechanics (bank wire, online transfer service, or cash-pickup operator) apply to remittances as to any other cross-border transfer.
Exchange control / capital control
Some countries restrict how much currency can leave or enter the country, or require government approval above certain amounts — these rules are usually called exchange controls or capital controls. They vary enormously by country and can affect both how much you can send and how quickly it clears, which is one reason the jurisdiction comparison guide stresses checking destination-country rules directly rather than assuming they match US rules.
FBAR and Form 8938
These are US reporting requirements, not transfer terms, but they show up constantly in cross-border conversations. They are covered in full in our US tax reporting guide — in short, they require reporting foreign financial accounts and assets above certain thresholds, separate from any tax owed.
Using this glossary
Keep this page open the next time a bank form or transfer confirmation screen throws an unfamiliar term at you — most of the language in this space describes fairly ordinary mechanics dressed in unfamiliar words, not genuinely complicated financial concepts.
ACH and domestic vs international rails
ACH (Automated Clearing House) is the US domestic electronic payment network used for things like direct deposit and bill pay — it is not the same system used for international transfers, and a routing number that works for a domestic ACH transfer will not, by itself, get money to a foreign bank account. International transfers generally use SWIFT (for bank-to-bank wires) or a transfer service's own settlement network, which is a separate system from domestic ACH entirely.
Intermediary bank fee
When a wire passes through one or more correspondent banks, as described above, each intermediary can deduct a handling fee from the amount in transit — often $10-30 per intermediary — before passing the remainder along. This is why a sender who wired exactly $1,000 sometimes finds the recipient received less than $1,000, even though the sender paid any stated fee separately; the deduction happened invisibly, mid-transit. Some providers offer to cover intermediary fees so the recipient gets the full amount — worth asking about directly if the exact amount received matters.
KYC (Know Your Customer)
KYC refers to the identity verification process banks and transfer providers are legally required to perform before processing a transfer — checking a government ID, confirming an address, sometimes asking about the source of funds for larger transfers. This is standard, required practice across the industry, not a sign that anything is wrong with a particular transfer; declining to provide requested KYC information is usually what actually delays or blocks a transfer.
Nostro and vostro accounts
These terms describe accounts banks hold with each other to facilitate correspondent banking — a "nostro" account is a bank's own account held in a foreign bank, used to settle transactions in that foreign currency, while a "vostro" account is the same relationship from the other bank's perspective. These terms rarely appear on a consumer-facing transfer form, but they explain why correspondent banking exists at all: banks maintain these mutual accounts specifically so cross-border payments can settle without every bank needing a direct relationship with every other bank in the world.
Exchange rate "lock" versus "float"
A locked rate is fixed at the moment you confirm a transfer, regardless of what happens to the currency pair before settlement. A floating rate is applied at the time of actual settlement, which can differ from the rate you saw when you initiated the transfer if the pair moved meaningfully in between. Neither is universally better, but the terminology itself is worth recognizing on a confirmation screen — it tells you whether the number you're looking at is final or provisional.
Same-day value versus next-day value
"Value date" refers to the date a transfer is considered to have legally settled, which can be different from the date money physically appears in an account, particularly across time zones and banking holidays in the destination country. A transfer marked "same-day value" is treated as settled that day for interest and compliance purposes even if the recipient doesn't see the funds until the next business day.
This is general information about typical cross-border money transfer mechanics and US reporting rules, not personalized tax or legal advice — specific thresholds, forms and destination-country requirements vary and should be confirmed with a qualified professional before a large or unusual transfer.