You can easily delete invoices from your Joist account.
1. Tap Invoices from bottom menu
2. Select the invoice that you'd like to delete by tapping on it
3. Tap More at the top right of the screen. If you're sure, tap Delete
4. The invoice will now be removed from the system
On iPhone/iPad you can also delete invoices by sliding your finger from right to left on the invoice you'd like to remove. A delete button will appear, and you can tap it to delete the invoice.
Note: Deleting an invoice cannot be undone, so be certain before you tap delete!