Timing Deductions. T currently figures that Federal, state, and local taxes consume about 30% of his income at the margin. Next year, however, due to a tax law change, his taxes should increase to about 40% and remain at that level for at least five or six years. Assuming T buys a computer for $4,000 and he has the option of deducting all of the cost this year or deducting it ratably through depreciation over the next five years, what advice can you offer?