As our accountant would reply, "what would you like it to be?"
It depends on your country of operation, city, usage, new or old. Try these for ideas, based on ours, in an expensive country.
Second hand cost, USD1M, leasing costs 4,500 per month
Fuel at 100L per hour (roughly). This varies greatly around the world so check your supplier. Multiply by hours per month. We pay US$ 1.80 per litre, yes LITRE.
Insurance. Around US$3,000 per month. Maybe cheaper around the world.
Hangarage. Varies greatly, depends on your airport/heliport or farm building. Try US$500 per month.
Scheduled maintenance. However much a 100 hour is in your part of the world. It takes about 18 man hours, with a few fluids to replace. Around $2,000 but we have a deal.
"Unscheduled" maintenance. Including 50 hour and 25 hour checks if your muffins of a CAA demand them over and above the EC required inspections. (Like ours does
) Pro rate from 100 hour.
Occasional SB's to fix, usually of an inspection nature. Allow $2,000 per month.
Say $450 per hour for a 500 hour year? Your mileage will definitely vary.