Taxcaster is just an estimate. There may be an entry that isn't in the app when calculated. You can go through your return again step by step and verify your entries. If you still feel like something is incorrect, you can complete an amendment. Please see below for additional details (2019 is not available as of yet):
https://ttlc.intuit.com/community/amending/help/how-to-amend-change-or-correct-a-return-you-already-...
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