How do I set the currency on an invoice?

You pick the currency when you build the invoice. Whether you're starting from unbilled hours, completed milestones, or a blank invoice, the currency is part of the invoice setup, and all line totals, discounts, and tax calculate in it.

With 18 currencies available and rates synced daily, you can match each client's local currency. Set it before you send — the client then sees the total and pay buttons in that currency in the portal.