Im not sure, it looks like rncla is correct, except for possibly the interest owed part.
This is taken from the turbotax website:
https://turbotax.intuit.com/tax-tips/small-business-taxes/estimated-taxes-how-to-determine-what-to-p...
It says: The safest option to avoid an underpayment penalty is to aim for "100 percent of your previous year's taxes." If your previous year's adjusted gross income was more than $150,000 (or $75,000 for those who are married and filing separate returns last year), you will have to pay in 110 percent of your previous year's taxes to satisfy the "safe-harbor" requirement. If you satisfy either test, you won't have to pay an estimated tax penalty, no matter how much tax you owe with your tax return.
So going back to my earlier example, if I say paid 30k in taxes in 2020. Then in 2021 for the first quarter I already owe 100k, I only have to make a payment of 30k and I am good? Or I may only have to make a payment of 7.5k (30k/4)? And then of course make 3 more 7.5k payments later in the year.
This seems like the right answer, but not sure
