For the federal tax return, you only file the Form 1040 and any federal forms and schedules that have an Attachment Sequence Number located in the upper right corner of the form or schedule. You send nothing else, especially do not send any state tax returns to the IRS.
You have to print, sign and date the Form 1040 on page 2. Include with the federal tax return all W-2 and Form 1099's you received which have taxes withheld on the forms.
Go to this IRS website for the address on where to mail the federal return, with and without a payment, by state - https://www.irs.gov/filing/where-to-file-paper-tax-returns-with-or-without-a-payment
Note - If the tax return includes a tax refund, the refund will Not be paid since it is over three years from the due date of the 2019 tax return.
