I don't know of any car company's lease calculators that take into account tax since taxes work differently in every state... e.g. near where I am, SC collects a $300 sales tax on sale of car, no tax on lease payments, but collects property tax, really unrelated to the lease payment or lease company whatsoever. NC collects sales tax on each lease payment plus property tax. GA collects 7.5% sales tax on the entire value of the car.
So since taxes are SO different across states, there's no way for a calculator to take into account them. So you just have to get your actual quote to figure out what your payment will be.