Hi davids2,

Thanks for posting in the Community! You can set the Preferred delivery method on your settings to Send later. 

Here's how: 

1. Go to Gear icon and select Account and Settings.
2. Select Sales.
3. On Preferred delivery method dropdown, select Send later. 
4. Select Save and Done.

After you create an invoice, make sure that you've selected Save or Save and new button so invoices will not be emailed to your customers. 

Feel free to drop a comment below if you have any other questions. I'll be around to help.