#How Currency Is Set on a Bill
- A bill's currency is captured when the bill is created (from the uploaded document, vendor default, or manual entry)
- The currency is shown in the bill header and in the bills list
- The amount on the bill is in the bill currency
#How Payment Currency Works
When a bill is paid:
- The From account (the company bank account on the bill) determines the payment currency
- If the bill currency matches the bank account currency, the payment goes out at face value
- If the bill currency differs from the bank account currency, Light calculates the equivalent amount using the FX rate for the payment date
The FX conversion is computed automatically when payment is entered/released — there is no manual FX rate override in the payment entry dialog.
#Bills Listed in Multiple Currencies
The Bills list shows the bill amount in its native currency. Filters and totals can be applied across currencies; multi-currency totals reflect each currency separately.
#Bank Accounts and Currencies
Each company bank account is denominated in a specific currency (see Settings → Bank accounts). To pay vendors in a particular currency without FX conversion, set up a bank account in that currency and select it as the From account on bills in that currency.
#FX Gain / Loss Posting
When a bill in one currency is paid from a bank account in another currency, the difference between the bill's posted amount and the actual converted amount creates an FX gain or loss. This is posted automatically by Light's accounting engine based on your company's FX configuration.
For period-end FX revaluation across open AP balances, see the FX revaluation tools in the accounting module.
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