How to spell SOIRTAX correctly?

We think the word soirtax is a misspelling. It could be just an incorrect spelling of the words which are suggested below. Review the list and pick the word which you think is the most suitable.

• sorta I'm sorta tired today because I stayed up late last night.
• surtax I was shocked to see the amount of surtax added to my monthly phone bill.

Excatally

• exact
• exacted
• exactingly
• exactly
• exacts
• executable
• exotically
• extol
• inexactly
• oxtail