Underpayment Penalty reference tool.
A general federal reference calculator for this topic. Federal tax law updates yearly; confirm limits and rules with the current IRS guidance.
Reference
Reference estimate - verify current rates and rules with the official source.
Educational reference only — not tax advice.
No — a reference tool. Check the IRS or a tax preparer for current-year rules.
Rates are approximate state or national reference values. Local rates, exemptions and rules can differ, so treat the output as a planning figure only.