Accidental mark a invoice as pay. how I get it back as un pay

Jumping in to quickly help with your question about correcting invoices in QuickBooks Self-Employed (QBSE), frankelvz.

We can take note of the invoice details and then delete and recreate it. Then, it'll reappear as an open invoice. You can also select Duplicate to create a copy of the invoice and then delete the paid one. See the screenshot below for your reference:

Here's how to delete and recreate the invoice:

1. Look for the invoice in the Invoices tab.
2. Click the drop-down list beside View, then select Delete.
3. Press Yes.

Once done, recreate the invoice by clicking the Create invoice button and entering the same details. Once done, press the Mark as paid button under the Action column. 

Feel free to check out these articles for more references and guidance when working in QBSE:

• QuickBooks Self-Employed Overview
• Export Transactions and Get Reports in QuickBooks Self-Employed

As always, you can go back to this thread or visit us again in the Community if you need anything else. We'll make sure that everything is working fine. Have a great day ahead.