2026 US ordinary individual tax underpayment, quarterly annual rates 7%,6%,7%,7%, compounded daily. Enter actual quarterly accrual days after applying legal start/stop/suspension rules. No principal payments or additional assessments during the interval. Excludes corporate cases, overpayment refunds, estimated-tax additions and penalties. Not final IRS account liability; periods outside 2026 unsupported.
2026 US ordinary individual tax underpayment, quarterly annual rates 7%,6%,7%,7%, compounded daily. Enter actual quarterly accrual days after applying legal start/stop/suspension rules. No principal payments or additional assessments during the interval. Excludes corporate cases, overpayment refunds, estimated-tax additions and penalties. Not final IRS account liability; periods outside 2026 unsupported.
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principal*((1+0.07/365)^(q1+q3+q4)*(1+0.06/365)^q2-1)principal*(1+0.07/365)^(q1+q3+q4)*(1+0.06/365)^q2