You can manually change the exchange rate for a specific transaction on December 31, 2025, by entering it directly into the form. QuickBooks updates and saves one exchange rate per day; this rate applies to new entries rather than backdating past transactions.
Follow these steps to use your own exchange rate for a transaction:
In the left menu, select + Create and choose the transaction type you want to enter.
Choose the customer or supplier from the dropdown menu.
Enter your desired exchange rate directly into the Rate field.
Fill out the rest of the transaction details, then select Save and close.