What is base currency? How to change base currency?
By default, your base currency will be predefined by the system when you register your company location.
If your predefined currency is wrong – you may change it after registration in, Settings ➝ Company Profile ➝ Your Base Currency field.
Your base currency can only be changed once and it cannot be changed at all after you have raised your first invoice/estimate/expense/product/project.
Note: You are also able to change base currency if you reset your account data (more here).