Hi @trberkovich !
It's best to let the IRS calculate the penalty and interest due to timing of their receipt of the tax return. Even if you attempt to calculate it, there is usually a small difference and they will still send you an automated letter with a penalty and interest calculation.
You could estimate it and to to https://www.irs.gov/payments/direct-pay to pay it.
This article contains links use to calculate your penalty and interest:
https://www.irs.gov/payments/interest
Hope this helps!
Cindy
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