Free tool
GST calculator
Add GST to a price or take it out, as CGST and SGST within a state or IGST between states, split exactly as a ReliTime tax invoice splits it. Free, with no sign-up.
Rates as of 22 September 2025, when the standard slabs became 5%, 18% and 40%. Nothing you type is kept.
Questions people ask
How is GST taken out of a price that includes it?
The price is divided by one plus the rate, and the GST is what is left: at 18% that is 18/118 of the price.
When is it CGST and SGST, and when IGST?
Within one state the tax is split equally between CGST and SGST; between two states it is all IGST. Where the split is an odd number of paise, the extra paisa goes to SGST, so the two always add up to the total.
Which GST rates apply now?
Since 22 September 2025 the standard slabs are 5%, 18% and 40%, with 0% for exempt supplies. Professional and engineering services are 18%.
See it on your own kind of work
We set ReliTime up with a walkthrough rather than a sign-up form. We will take you through a working organisation, from a week of timesheets through approvals and work in progress to a tax invoice, answer your questions as we go, and set up yours.
Or write to hello@relitime.com.