You'll want to indicate that you choose to have all of the income included on your 2020 tax return, otherwise you'll needlessly have to include Forms 8915-E with your 2021 and 2022 tax returns to show the portions of income deferred to those years even though they've already been repaid, just to show the repayment again. By choosing to have all included on your 2020 tax return, nothing carries forward.
