I lost my copy of my 2016 taxes. So how do I get a transcript on line
If you have filed with TurboTax before its really easy
https://ttlc.intuit.com/questions/1900748-how-do-i-get-a-copy-of-a-return-i-filed-in-turbotax-online
You can obtain a transcript from the IRS website
https://www.irs.gov/newsroom/how-to-request-a-transcript-or-copy-of-a-prior-years-tax-return