If you chose to have a portal user E-File via the portal and later discover an error, then you will have to go back to the plan to click on the draft Form 8955-SSA to click on "Amend 8955". By clicking on the button, the form will become editable, and the Amend box will be auto-checked. When the Form 8955-SSA has an OK status, the plan can be E-Filed again via the portal.
