Forward only....

• Haven't Capital losses always been carried forward?

I think so and I've been doing this for a long time.

I do remember different rates and a LTCG subtraction.

Not desiring to be nasty but is there a reason you did not do the research yourself in tax law, or even lazy in Google? This is a community board to help each other out with serious tax questions or software issues.  Too many people are posting questions that could take 5 seconds to research on their own.

Be careful there.  You could be put on double secret probation like some of us and ultimately be banned.  Then the folks that ask the stimulating questions about stimulus payments and the exclusion of unemployment are going to have to step up and answer these types of questions.  You really don't want that to happen, now do you?