Currency guide
Why Bank Exchange Rates Are Different
Two valid exchange-rate displays can differ because they serve different purposes. A reference publication describes a market relationship, while a bank quote includes the provider's transaction process.
Timing and processing dates
A purchase date, posting date and settlement date may not be the same. The rate applied by a card or bank can therefore come from a different observation than the one a customer first viewed.
Provider pricing
A bank may include a spread in its conversion rate and may also charge a separate foreign transaction, transfer or service fee. Cash exchange can have different inventory and operating costs.
Questions to ask
Ask for the final amount, the currency being charged and every fee before comparing providers.
- Is the quote guaranteed, indicative or a reference rate?
- Which date determines the conversion?
- Are fees added separately or included in the rate?
Example: purchase date and posting date
A card purchase made on Friday may be posted on Monday. If the issuer uses the posting-date process, the applied conversion can differ from the reference rate viewed when the purchase was made.
Practical comparison
| Cost component | How it appears | What to verify |
|---|---|---|
| Rate spread | Inside the rate | Effective rate |
| Percentage fee | Percent of amount | Fee base and order |
| Fixed fee | Separate amount | Charged currency |
Common misconceptions
- The purchase date always determines the card conversion.
- A fixed fee and a percentage fee have the same effect.
- Different quotes mean one source must be invalid.
Practical steps
- Ask which date controls the rate.
- Confirm the charged currency.
- List every separate fee.
- Compare the final customer amount.
Related resources
Sources and review
Data source: Official references listed below. This educational guide does not publish a current exchange-rate quote.
Last data update: Not applicable to this educational guide.
Last editorial review:
This guide provides general currency reference information. It is not financial, tax, accounting, legal, investment or trading advice.