My declaration is done and submitted. In preparation for next year's taxes, I'd like to review the questions posed and answers I gave for this year. Is that possible?

@escavone 

There is a way, but I'm not going to recommend that you do it.....nor indicate how   (someone else may, but not me....too dangerous to your tax file)

With the "Online" software, IF, during your review, you accidentally answer something differently from what you filed...then it will irreversibly change what you previously entered and already filed.......then what transfers to next year's tax file will be wrong.   Also, any PDF you download later would be wrong...Never mess with an already-filed tax return unless you actually must prepare an amended tax return to correct a critical error.

You should also make sure you download a PDF file of your completed tax return right now (if you haven't already done so))....so that you have your own copy of the original.

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How could this be done in the future?

Buy and Use the desktop/download software on a full MAC or Windows computer.   When using that TTX software, you could save a separate second test copy of what you have already filed.....then mess around in the second copy to your heart's content, without endangering the real original.

@escavone I agree with @SteamTrain it's too dangerous to mess with the tax return file. However, you should be able to print/save a PDF of your return and all worksheets. Then you can review the PDF. you can't change anything so the .tax20xx file is safe. in the future this should be done before you file. Thus, you may be able to avoid IRS letters and the need to amend.