You must file Form 1040-X within 3 years after the date you filed your original return or within 2 years after the date you paid the tax, whichever is later.
Also, amended returns (even current ones) may not always be filed electronically. Sometimes they reject and must be mailed in.
This is from IRS Topic 308, Amended Returns.
If you're in the situation of unclaimed rental depreciation over more than two years, it is best to have a tax expert help you file Form 3115.
TurboTax has both Live Experts and Verified Tax Pros that can help.
@oreoshark1
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
