If you used the free version, then you would not have claimed your mortgage interest.
If you are single and your itemized expenses such as your mortgage interest, property taxes, medical expenses, and charitable donations are not more than $12,000 then it would not do you any good to amend your return. This is because you can either get the standard deduction or the itemized deductions, but not both. If you are married filing jointly, then the standard deduction is $24,000.
So, it is NOT something that you MUST include on your return. It is something that you CAN include IF it provides you with a better refund or lower tax due.
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