Should be the same as what you used if you properly depreciated the rental.
They will use your basis and apply 27.5 years for depreciation to the property.
Land does not depreciate.
This is not to say that the IRS couldn't question what you reported as the basis, but they don't have a different method on file for your rental or anyone else's.
TurboTax uses the same method as that which is mandated by the IRS.
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