As long as your ex-husband filed his amended 2016 tax return unclaiming your son as a dependent, you may paper-file your tax return right now. Please note that since your husband's original return lists your son's social security number (SSN), any attempt by you or anyone else to efile a tax return using your son's SSN will be rejected. The reason for this is that the IRS is too busy processing everyone's tax returns and do not get around to processing amended returns until around 8 weeks from now. The only option you have at this point is to print, sign, date and mail in your tax return.
