The IRS does not send you any confirmation that a tax return was received, either e-filed or mailed. If you did not use some type of tracking service when mailing the return you will not know if the IRS ever received the tax return.
For tax year 2017 you will need to enter the 2016 AGI to electronically file the 2017 tax return. You should always keep a copy of your tax returns after filing. Download the PDF of your 2016 tax return from the Welcome Home screen after you sign onto your online account.
