Can the domestic currency be changed to Japanese Yen?

Yes, Opjp.

You can still change your domestic currency to Yen if you haven't activated your Multicurrency feature in QuickBooks Online yet.

Here's how:

1. Select the Gear icon, then Account and Settings.
2. Go to the Advanced settings and then click the Pencil icon from the Currency section.
3. At the Home currency column, select JPY from the drop-down menu.
   
4. Select Save, then Done.

If you have already activated the Multicurrency feature, you can only change the home currency by deleting all your data and starting over from scratch.

Additionally, these articles may come in handy. Feel free to check how multicurrency works when activating it in QuickBooks Online.

• Multi-currency FAQ.
• Turn on and use multicurrency.
• Assign a foreign currency to a customer in QuickBooks Online.

Always know that I'm here to help. Just mention me in you reply or post again. Take care!