In reading the article about multi-currency in QuickBooks Online, it says, "Some product features may not be available once this feature has been turned on." What features specifically? I found an article re: QuickBooks Desktop and it specifically says what you won't be able to do (see below). Needing the same info for QuickBooks Online.
Once on, you can no longer turn off Multicurrency. Make sure that you back up your data before proceeding. Here are other important things to consider:
QuickBooks Desktop add-ons, such as Fixed Asset Manager and Statement Writer, only use U.S. currency. They won't be affected by activating this feature.
You won't be able to use Insights, Income Tracker, and Bill Tracker. In QuickBooks Accountant and Enterprise, you also won't be able to batch enter invoices or batch delete/void transactions.
You won't be able to select multiple customers in the Invoices for Time and Expenses window.
You won't be able to exchange information with QuickBooks Desktop for Mac or copy your company file to work with it.
Online payment of invoices doesn't work with multiple currencies.
