Do I need QuickBooks online to be able to connect my izettle?

I want to get you pointed in the right direction to verify this iZettle connection, @katymedley.

QuickBooks integrates with various third-party applications. Thus, QuickBooks Online can be connected to iZettle.

However, to help determine if the account that you're using right now can be connected, I suggest reaching out to the iZettle support team. They'll be able to discuss with you the integration matter and provide the necessary actions that need to be taken.

On the other hand, I'm adding here a reference that you can check out about entering transactions manually in the system in case you need it in the future: Manually add transactions in QuickBooks Self-Employed.

Keep me posted if you need anything else. I'm always here to help. Have a nice day!