can I pay what I owe for my federal taxes with my return?

[VolvoGirl]

Yes if your refund is big enough to cover the fees plus the Extra $40  Refund Processing Service charge ($45 in California).  

How to review your fees
https://ttlc.intuit.com/community/charges-and-fees/help/how-do-i-review-my-fees-in-turbotax-online/0...