I'm not an accountant. Consult a tax accountant before you do this.
First, make sure the specific one you are buying has the gross weight at over 6000 pounds as printed on the door jam. Only the V8/4WD versions do. But don't take any chances, make sure it's actually printed on the door jam of the vehicle you will be driving home. If it is over 6000 pounds, you may be entitiled to a deduction if:
(1) You use it for business more than 50% of the time. The rules here are tricky. If you don't actually use it for business, you probably won't be able to sneak by.
(2) If your income qualifies. Basically, you can't claim more than you made. The rules here are flexible, so you might be able to qualify.
(3) You buy and don't lease.
The $100,000 limit is still in effect, but only for a few more days. President Bush is expected to sign a new tax bill that would, among other things, put the limit back to $25,000. The new bill is expected to be signed this week. However, you may still be able to get most of it as a write off. Here's how:
Besides the $25,000 basic equipment deduction, SUVs still qualify for "bonus depreciation", an added write off of 30 percent of the purchase price above $25,000. Beyond that the regular depreciation rules of 20 percent in the first year will apply.
Using a 2005 Limited 4Runner V8/4WD that costs $40,000 out the door as an example, you should be able to write off $31,600 of the $40,000 sticker price in the first year under the revised rules. A $25,000 equipment deduction, $4,500 in bonus depreciation and $2,100 in regular depreciation.
Note though that this is if you use the vehicle 100% of the time for business. If you use it 80% of the time for business, for example, the deduction would be $25,280.
Look here:
http://www.selfemployedweb.com/suv-tax-deduction-6.htm for some more information. I'm not an accountant. Consult a tax accountant before you do this.