Because you selected the Optional Refund Processing Service to have the TurboTax account fees deducted from the federal tax refund instead of using the other option of paying the TurboTax account fees with a credit or debit card.
This Optional service you selected has a service fee of $39.99.

I did not have payment taken out of my refund so why am I being charged $40.00 for the processing fee?

To contact TurboTax customer service/support use their contact website during business hours. If the problem concerns any type of refund for fees, use the key words billing issues and do Not use the word Refund or you will get a phone number for tax refunds.

 

Use this website to contact TurboTax support during business hours - https://support.turbotax.intuit.com/contact/
Support can also be reached by messaging them on these pages https://www.facebook.com/turbotax/ and https://twitter.com/TeamTurboTax

 

Use this phone number and select TurboTax - 1-800-4-INTUIT (1-800-446-8848)