For the US only ....
Don't miss your loopholes, such as: [ SUV Loophole If you drive a substantial amount for business (say, for commuting at an out-of-town job), an incredible loophole is open to you. For example, based on full-time usage, you can deduct up to 100% of the cost of an SUV (up to $102,000) in just the first year. But you must buy a large SUV or Pick-Up to take advantage of this tax break. ] It's not too late to buy that Hummer ..
[ Important 2004 Tax Changes Congress passed 3 separate tax acts of special interest to Engineers and Architects. Together, these tax acts have produced the largest tax reduction in decades. ]I recommend this book. Each year it's published anew.