The preferences you mention would only apply if you are subject to alternative minimum tax (AMT). They would be used to calculate the depreciation used to calculate your AMT. If you were subject to AMT, then your tax would be calculated under the AMT rules. Being subject to AMT would involve more than a simple depreciation adjustment, so if you do have AMT there would be other entries on your tax return that would effectuate that. Unless your return as stated in TurboTax was the exact same as it was stated using H&R Block, you may not see a reference to AMT in the H&R block return. In either case, it would have no affect on your normal, non-AMT tax.
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