Correct word for business expenses

[Lothor]

Later this month I've got to go to the local tax office and declare last year's earnings as someone who is self-employed for the first time. There seem to be a lot of different words for expenses (i.e., stationery, travel, etc) 費用、経費、出費 etc. What's the one generally used when referring to business expenses?

 

[Toritoribe]

経費 is the word.
Well, the season of 確定申告 is approaching...

 

[Lothor]

Thanks very much!