When amending my 2016 taxes do I have to fill the whole form out or just the part that needs changed?

[schreckpam]

why would I have to fill out the whole form on my amendment 1040X.    When  the only thing that was wrong and reason why I need them amended,was .yes box on have health coverage was checked instead of no box . thank You

[Critter]

If you are completing the form 1040X ...

Column A should have the figures from the original return, Column C the corrected figures and Column B the differences between the other 2 which needs an explanation on page 2 of the form 1040X.

If you completed it correctly you will see an entry on either line 16 OR 18:

On line 16 should be the amount you paid with your original return. If you paid nothing already then this line should be zero.

On line 18 should be the amount of your original refund you received. If you have not received your refund yet then you need to wait for it. If the refund changes from what you expected then this line must reflect that change.

Then you will see your extra refund on line 22 OR  the new balance due you need to pay on line 20.