In order to file a 2016 tax return (only allowed on paper , mailing at the Post Office at this late date)....you would have to use the Desktop/download software that you buy and install on your home compute.
The desktop software allows you download ItsDeducible data contained in any ItsDeductible account that you have the UserID and password for.
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A download for 2016 can be obtained here:
https://turbotax.intuit.com/personal-taxes/past-years-products/2016/
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
