It depends. Due to special provisions granted to the catastrophic disasters of 2017, many who claim losses have the option of including them on their 2017 return or amending their 2016 return to have them claimed there. Here is an FAQ with more information: https://ttlc.intuit.com/replies/6469982
If it is more beneficial to claim your losses as part of your 2016 return, then you will want to amend your return. Here are instructions on how you may do so: https://ttlc.intuit.com/replies/3288565
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