If my estimated quarterly tax payments total 100% of my tax owed from the current year, I will not owe penalty for underpayment. When do I need to increase that to 110%?

[sfvoyage]

I recall that 100% is not sufficient to avoid penalties if my income should be much higher than the previous year's, but I forgot the threshold.

[baldietax · Accepted solution]

see Form 2210 instructions (or 1040-ES), the safe harbor is the smaller of - 90% of current year tax (regardless of AGI), or 100% of prior year tax (110% if prior year AGI > 150k or 75k for Married Filing Single)