You are correct that your carryover loss is subtracted from your 2020 gain. TurboTax will calculate that for you if you used the program last year and you carry over your data. The $3,000 amount refers to the fact that if you had a net capital gain loss of more than $3,000, only a maximum of $3,000 would be subtracted from your other income. The rest would be carried over to the next year. But that is not your situation.
