Cut off tax (6)
I believe the answer is:
excise
I believe this is a double definition.
'cut off' is the first definition.
(thesaurus)
'tax' is the second definition.
(I know this)
(Other definitions for excise that I've seen before include "Expunge the tax?" , "Internal tax" , "Tax on certain goods and commodities" , "A tax to be cut out, perhaps" , "Duty; cut out" .)