Coopermine,
It's likely that the problem is not knowing how NY sales tax is figured in to your lease. Here in IL, not only do you get whacked with paying 100% of the sales tax (as if you were buying it), even though you only are using a portion of the vehicle's life and will turn it back in -- but there are other fees that are taxable as well -- you get taxed on any doc fee plus a fee for title or transfer evidently is taxable as well. We also have county tax that has to be figure in.
One comment before anything else -- do NOT put $5,000 down, either on a trade or via a check that you hand the dealer. Why? You can find this out elsewhere too if you look, but if your Enclave were wrecked and totaled by the insurance company, the insurance company does not pay YOU -- they pay the leasing company. In this case, GMAC if you're leasing through GM. So, any money you've put into the deal beyond your lease payments (in my case here, including IL taxes) are GONE, GONE, GONE!!! Even though the Leasing Company is responsible for the taxes (because they actually own the vehicle and are renting it to you, they pay along whatever sales tax would have to get paid to you (again, in IL). In other places, you are taxed on just the lease payment or the % (RV) of the vehicle you're using. So, whatever you do, don't put money down or trade a car in. If you do trade, have the dealer cut you a check for the vehicle, otherwise you do have a risk of losing that "investment" which you will never get back.
As far as leases -- you can easily calculate by hand (literally) --
The formula is:
1. Capitalized Cost (the price you negotiate plus any other extra fees) - Residual Value (always based on MSRP) so in your case:
40,893 + 1312.50 = 42,205.50 (cap cost) - 5,000 (cap cost reduction) = 37205.50 - 27,878.30 (MSRP of 44,965 x 62%) = 9,327.20 / # of months (39) = $239.16 (this is the depreciation or "rent" each month for use)
This then gets added to this:
2. 37,205.50 (Cap Cost) + 28,878.30 (Resid Value, 62% of MSRP) = 66,083.80 x .00333 (Money Factor, this x 2400 = 7.992% Interest) = 220.06 (this is how much interest you're paying to use their money to buy the car and let you rent it)
Your lease -- without taxes taken into account -- 239.16 + 220.06 = $459.22
You can capitalize the cost of taxes and any fees -- it simply gets added into the calculation above -- there's no reason to walk out of the dealership paying anything more than the 1st month's payment -- any license fees, etc can all be included in your lease payment. The calculation is simple but most people get really confused by it. What you really need to know is how taxes are calculated and taken into account on a lease where you live. On entire value of Enclave (your selling price), on the amount of vehicle you're using up, or on the lease payment itself. Then this amount can be added into the lease for a nothing down payment. It truly is the way to go if you are going to lease.
Hope this helps.