Yes, you should start with the earliest year and proceed from there.
You can only use Turbotax Online to file for the current year (2017) taxes, and not for any other year.
If you would like to use TurboTax for 2014, 2015, or 2016 you will need to purchase the Desktop Version for the specific year for which you need to file a return. You can purchase the Desktop version at this link:
http://shop.turbotax.intuit.com/personal-taxes/past-years-products.jsp
You are also able to download the Forms and Instructions free from the IRS web site at this link:
http://www.irs.gov/app/picklist/list/priorFormPublication.html
Yes, you should start with the earliest year and proceed from there.
You can only use Turbotax Online to file for the current year (2017) taxes, and not for any other year.
If you would like to use TurboTax for 2014, 2015, or 2016 you will need to purchase the Desktop Version for the specific year for which you need to file a return. You can purchase the Desktop version at this link:
http://shop.turbotax.intuit.com/personal-taxes/past-years-products.jsp
You are also able to download the Forms and Instructions free from the IRS web site at this link:
http://www.irs.gov/app/picklist/list/priorFormPublication.html
Please see the link here on how to complete this utilizing Turbo Tax software:
https://ttlc.intuit.com/replies/3301770
Here is an additional helpful link as well:
https://turbotax.intuit.com/tax-tips/irs-tax-return/how-do-i-file-back-tax-returns/L535BxMms