Tax Filing, Penalty & Appeal Calculators

These are the tools for after something has gone wrong, or is about to: a return filed late, a notice received, a refund that has not arrived, an assessment to challenge. Each one is built from the section that governs it — the penalty floors and caps, the surcharge rate, the days allowed to appeal at each forum and the fee the forum charges.

The two reconciliation tools are for the return itself: matching the tax withheld during the year against what the return claims, and reconciling the change in your wealth statement, where the usual false gap is a receipt taxed at source that was left out.