In all seriousness
You come over quite naive for someone discussing the huge expenses of operating a helicopter or three.....
There are so many pitfalls ahead that you must either seek 'proper' advice or get googling severely ....
Yes, there will be pruners on here who can advise but their personal situation will most probably be different than yours ...
For example - I would say - of course, you are only taxed on profit so maintenance costs will reduce your profit.
Allowable expenses/costs will also cover travel incurred during maintenance - as long as it is not commuting etc
There are no silly questions on Rotorheads but you might get some silly answers......