You can enter your estimated tax payments to NC in the federal interview under the "Deductions & Credits" tab.
- Scroll down to "Estimates and other taxes paid"
- "Show More"
- "Start/revisit" Estimated Tax Payments"
- "Start/revisit" State Estimated Taxes for 2020"
You are correct there should not be a double counting for the refund applied. The correct line is 21a on the NC D-400. Line 16 is other NC tax credits like a credit for taxes paid to another state.
In the NC interview revisit the credits section to verify. Line 16 could contain carry over credits from 2019, but would not be the refund applied.
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