The IRS will not begin accepting --or rejecting--tax returns until January 29, so until then, your return is sitting on a server, waiting. In the meantime, do not add anything, delete anything or change anything on your return even if you discover that you need to.
https://www.irs.gov/newsroom/2018-tax-filing-season-begins-jan-29-tax-returns-due-april-17-help-avai...