When I enter the rental depreciation, TurboTax schedules for 40 years, but the rental has been under straight line (27.5) on all previous tax returns. How do I change it?

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Sec. 168(g)(1)(A} provides that property predominantly used outside the United States must use the "alternative depreciation system." 

Property located outside the country, you're required to depreciate the cost over 40 years.

Generally You can amend three previous tax years.