I need to file for the years 2014, and 2015. I have already filled 2019 return. How do I file taxes for those years?

[DoninGA]

TurboTax does not support tax years 2014 or 2015.

A 2014 or 2015 tax return filed for a tax refund will not be paid since the time to file for a refund has expired.

[xmasbaby0]

If you OWE tax due for those years the IRS still wants you to pay.  Prepare the returns by hand and mail them in.

2014

Form 1040 https://www.irs.gov/pub/irs-prior/f1040--2014.pdf

Form 1040Instructions  https://www.irs.gov/pub/irs-prior/i1040gi--2014.pdf

Form1040A   https://www.irs.gov/pub/irs-prior/f1040a--2014.pdf

Form 1040A https://www.irs.gov/pub/irs-prior/i1040a--2014.pdf

Form1040EZhttps://www.irs.gov/pub/irs-prior/f1040ez--2014.pdf

Form1040EZ Instructions https://www.irs.gov/pub/irs-prior/i1040ez--2014.pdf

2015

Form 1040  https://www.irs.gov/pub/irs-prior/f1040--2015.pdf

Form1040 Instructions  https://www.irs.gov/pub/irs-prior/i1040gi--2015.pdf

Form1040A  https://www.irs.gov/pub/irs-prior/f1040a--2015.pdf

Form 1040A Instructions  https://www.irs.gov/pub/irs-prior/i1040a--2015.pdf

Form 1040EZ   https://www.irs.gov/pub/irs-prior/f1040ez--2015.pdf

Form 1040EZ Instructions  https://www.irs.gov/pub/irs-prior/i1040ez--2015.pdf

https://www.irs.gov/filing/where-to-file-paper-tax-returns-with-or-without-a-payment

[Anonymous]

you will have to get the forms from the IRS website and manually prepare them.  while some sites offer the software for those years, this software is usually  not the "current" version  and can't be updated.  the return those apps prepare will probably be inaccurate.      you other choice is to see a pro.  they usually have the software to correctly prepare those return.     if you owe, be prepared for some penalties for late filing and payment.   no penalties if you don't owe