You cannot claim catch-up depreciation on your 2018 tax return.
If you have not depreciated your rental home in previous years, you'll need to amend your previous years' returns to claim it. You can file amended returns for 2015, 2016 and 2017. Earlier years are now closed for amendments. Please note that you only have until April 15, 2019 to amend your 2015 tax return.
It is important to amend for these three years, because when you sell the property, you'll have to recapture all allowable depreciation, even if you did not actually deduct them.
One other option for you is to file Form 3115 - Application for change in Accounting Method. This option would allow you to claim depreciation for all the years you have missed. Filing form 3115 is a delicate process and I would advise to hire a local tax professional to do it for you.
Please see the
following TurboTax FAQ for
instructions on how to amend your tax return in TurboTax.
https://ttlc.intuit.com/replies/3288565
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