i guess it's not just down to payments.. do you mean if a monthly lease payment is lower than finance payment, then it is better to lease? a lease vs finance calculator does not consider the fact that you will forever have a lease to pay, versus if you finance, your payment stop after 5 years for example.
this is getting into a taxation discussion now.. but i am interested to know more. if i already have a high income job, and i open another business. can i still expense the full lease payment, or i can only claim some of it? reason is one may argue that i use the car for my job more than my 'business'?