New Member

If a Tax Liability is increased through an amended return, should the increased amount be added to original amount in order to report the complete 2017 Tax Liability?

Level 15

After you file

yes. don't forget to include the amount already paid with your original filing. 
That way, it all works out.

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Level 15

After you file

Yes, the correct tax liability for 2017 is what was on the original return plus the Amended return.

If tax was due on the original return and paid, then the additional tax due is listed only on the Amended return.