If only two or three years are in error, you may amend the tax returns for each year, reporting the reduction in depreciation expense. Then the current year’s tax return would be reporting the correct cost basis.
But tax returns more than three years old may not be amended and refunds will not be honored.
IRS form 3115 Application for change in accounting method can report the change but this form is not supported by the TurboTax software. See the instructions here.
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