Yes, you can file Form 8606 alone if it doesn't change your original tax return: Form 8606 for 2018
Sign Form 8606 and send it to the IRS the same place you would otherwise file Form 1040, 1040-SR, or 1040-NR. Be sure to include your address on page 1 of the form and your signature and the date on page 2 of the form. Please see Where to File Paper Tax Returns With or Without a Payment
You can amend your 2019 tax return as soon as you filed the 2018 Form 8606.
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
