How do I change the due date for a customer invoice from 30 days to 45 days?

Welcome to QuickBooks Community space, @J_Neutron.

I'll share some information about changing the invoice due date in your QuickBooks Self-Employed (QBSE).

Currently, there's no option in QuickBooks Self-Employed where you can set a term for the due date when creating invoices. An option for you to change the invoice due date in QBSE is by editing it manually. Let me guide you through the steps:

1. Sign in to your QBSE account.
2. Go to Invoices and select the invoice you want to edit.
3. Click Edit under the Action column.
4. Hit Customize, and under the Invoice details dropdown arrow, toggle on the Due date.
5. Once the due date appears on your invoice, manually edit the date.
6. Click on the dropdown arrow beside the Email option, then hit Save.

In case you want to process your invoices in QBSE, you can visit this article(Section 3) for guidance: Create invoices in QuickBooks Self-Employed.

Feel free to come back to this post if you have other concerns or follow-up questions about managing your invoices in QBSE.