Probably you chose to have the TurboTax account fees paid from the federal tax refund and the service charge for that option is $39.99.
See this TurboTax support FAQ for removing the pay with refund fees and then pay TurboTax account fee with your credit/debit card - https://ttlc.intuit.com/community/downgrading/help/how-do-i-remove-pay-with-my-refund-fees-in-turbot...
