How do I rebill past due invoices? My accountant is on vacation and I've never done this before.

Hello, @irishfairieprinc.

It's great having you here in the Community. I'm here to address your issue regarding rebilling past-due invoices by sharing potential scenarios. I can provide the assistance you need.

Are you referring to your vendor bills that are already past due? If so, you'll need to create a bill payment, follow the steps below:

1. In the left menu, click the + New button.
2. Choose Bill.
3. From the Vendor ▼ dropdown, select a vendor.
4. From the Terms ▼ dropdown, select the bill's terms. This is when your vendor expects to be paid.
5. Enter the Bill date, Due date, and Bill no. as they're recorded on the bill.
6. Go to the Item Details section and enter the bill details.
7. Enter the Amount and tax.
8. If you plan to bill a customer for the expense, select the Billable checkbox and enter their name in the Customer field. 
9. Select Save and close when done.

For more details on tracking your bills, check out this article: Enter and manage bills and bill payments in QuickBooks Online.

If you're referring to past-due invoices from your customer, you can create a customer statement for past-due invoices in QuickBooks Online (QBO). You need to select dates for the statement and the date range. Let me show you how:

1. Go to the Sales menu, then to the Customers tab.
2. Select the checkboxes for the customers you want to make statements for.
3. In the Batch actions dropdown ▼, select Create statements.
4. In the Statement Type dropdown ▼, select the customer statement type:
   • Balance Forward: Lists invoices and payments with outstanding balances for a specific date range.
   • Open Item: Lists all open, unpaid invoices from the last 365 days.
   • Transaction Statement: Lists all transactions for the selected date range.
5. Select the dates for the statements and the date range.
6. Review the customer's email addresses.
7. Select Save, Save and close, Save and send, or Print or Preview.

For detailed information, refer to this article: Create and send customer statements in QuickBooks Online.

You could also consider voiding or deleting this invoice and creating a new one. This approach ensures the transaction does not impact your account balances or reports. Refer to this article for guidance on voiding or deleting transactions.

I'm adding this article you can browse to learn how to record partial and multiple payments in QBO: Record invoice payments in QuickBooks Online. 

In addition, check out this article for creating reports that offer an overview of your business's financial status: Run reports in QuickBooks Online.

Feel free to return to this post if you have any other questions or issues regarding your invoices in QBO. I'll be available to assist you with any other QuickBooks-related matters. Have a great day!