sense to do anything but lease. See Jon Shafer. As far as I know, the MACRS restrictions of the IRS will not let you depreciate a car beyond 15K. Therefore, you can only write off the interest portion of your payment. Put NOTHING down. Or, give me the down, I will pay it back with interest in 3 yrs. Invest it. There are no penalties for selling a leased vehicle beyond the first year. If you mod it, don't plan on returning it, consider it a buy. Treat it just like you were buying it with a lower payment. Keep the depreciating car on their money, not yours. Pay as little as possible and sell it for no loss, no gain. That's all you're going to do anyway. The only question is, who gets to invest your 8 grand, you of the bank. If you like the car, at the end re-lease it until the residual is under $16K, then buy it. This way you can write it off the whole way. If you buy and mod it you can't return it, you have to sell it. Same with a lease, except you keep your money; you pay less; you write off more.