If the change from Tax Court Method to IRS Method doesn't change your Refund, you may not need to Amend your 2018 return.
However, f it changes the amount of the Carryover Loss, you may want to Amend and list your reason for amending as 'Change from Tax Court Method to IRS Method on Schedule E'.
Click this link for more info on How to Amend a 2018 Return.
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