Add or strip GST on works-contract billing at the right rate — no more manual back-calculation.
Add or strip GST on works-contract billing at the right rate — no more manual back-calculation.
sotyn.ai auto-applies the right GST on every bill type — Sales, RA, MB, T&C.
Want this reviewed on your real projects? Send it to us and we will walk through where the money is actually going — send me this result →
Works-contract GST trips up billing every cycle — especially back-calculating the base value out of a GST-inclusive amount. This calculator does both directions: add GST to an exclusive amount, or strip GST out of an inclusive figure, at 18% (the common works-contract rate), 12% or 5%.
Most construction works contracts attract 18% GST, with 12% and 5% applying to specific categories (e.g. certain affordable housing and government works). Confirm your project's category with your tax advisor.
Divide the inclusive amount by (1 + rate). This tool's 'Remove GST' mode does it for you and shows the base value and the GST component.
A back-of-envelope number is a start. In a free 20-minute demo we open sotyn.ai on your own trades and project sizes — no slides, no staged data.
A 20-minute walkthrough on your trades and project sizes — not a slideshow. Three fields and we will call you back.
Take the 2-minute EPC Profit Leak Scorecard and see exactly where — and how much — your business is losing every year.
