Hi there, @shire39.
Welcome to the Community. Yes! You can add transaction manually from previous year even the bank account is closed. Follow the steps below:
- Click on the Transaction menu and tap Add Transaction.
- Enter the amount and the description.
- Search the Select a category menu and choose the option to sort out your transaction.
- If you have a receipt, you can drag and drop it onto the form.
- Hit Save.
For more visual guide on how to add transaction manually, you can check out this article: Manually add transactions in QuickBooks Self-Employed.
Just in case, I've added this article for your reference: QuickBooks Self-Employed Overview.
Please don't hesitate to let me know if you should have any questions about this or anything else QuickBooks related. Have a wonderful day!