Thanks for joining the thread, Nateshimek33. It's possible that the Automatic invoice reminders are toggled on in your Accounts and settings.

I can guide you through reviewing automatic invoice reminders in QuickBooks Online (QBO) so you can have more flexibility on when to email invoice reminders to your customers.

You can follow these steps to review your Accounts and settings to update your invoice reminders setup or completely toggle it off:

1. Go to the Gear icon. Then, select the Sales tab. 
2. Choose the Reminders section. 
3. If the Automatic invoice reminders are toggled on, update day(s) to change when it will be automatically sent. Alternatively, toggle off to stop the reminders entirely.
4. Click on Save. Then, Done.
   
   

    

After this, let me add this article about recording invoice payments in QBO as a future reference: Record invoice payments in QuickBooks Online.

We'll be here in the Community if you have other questions about preventing auto-emailing of invoices in QBO. We're committed to offering ongoing support. Take care!