Work out reverse gst instantly with clear inputs, formula shown and shareable results.
Working backwards from an invoice total and the tax charged recovers both the taxable value and the rate actually applied. Comparing the implied rate against standard slabs is a quick check for invoicing errors.
Reverse rate
Taxable value = total - tax; implied rate = tax / taxable value × 100
Tax figures are estimates based on the rates, caps and thresholds you enter. Real rules differ by jurisdiction and change every year, and personal circumstances alter the outcome. This is not tax or financial advice — confirm with a qualified adviser.
Because a rate that matches no slab usually signals an error, a mixed supply or an undisclosed cess.
Add them together as the total tax before computing the implied rate.