How do I add my capital loss carry over from past years if I haven't filed them?

[Carl]

Capital *GAIN* carry over???/ To the best of my knowledge, there's no such thing. Did you mean capital *LOSS* carryover?

Also, are you dealing with this on a SCH C business, SCH E rental, or SCH F farm assets that you sold?

[mtnalex1]

Sorry, I meant capital loss which I haven't included in my tax return for 11 years. Now I need a way to go back and fix this.

[ColeenD3]

You may not be able to. See all the comments in this thread. Your best chance is Form 3115.

Capital Loss