GST calculators & tools.
Free, browser-based tools for the numbers you actually need at return time — GST splits, GSTR-3B liability, ITC reversal, registration thresholds and which return you file. Nothing is stored, no sign-up, and every result links back to what to verify on gst.gov.in.
Calculators
Enter your figures, read the result. These run entirely in your browser — nothing you type is sent anywhere.
GST Calculator
Add or remove GST from a price, and split it into CGST + SGST or IGST for any rate.
Open calculator →GSTR-3B Liability Calculator
Work out cash payable after ITC set-off, in the order the portal applies, plus your credit carried forward.
Open calculator →ITC Reversal Calculator (Rule 42)
Split common input tax credit between taxable and exempt supplies and get the monthly reversal (D1 + D2).
Open calculator →Late Fee & Interest Calculator
Estimate the late fee and Section 50 interest on a delayed GSTR-3B.
Open calculator →Find out what applies to you
Short guided checks for the questions people ask before they even open the portal.
Registration Threshold Checker
Goods or services, your state, e-commerce and reverse charge — see whether GST registration is required.
Check now →Which GST Return Do I File?
Pick your registration type and turnover and get the list of returns you owe, with the due-date rule for each.
Find my returns →GST Rate Finder
Look up the GST rate for a good or service by HSN/SAC code or description.
Search rates →Due Date Calendar
Every recurring GST return and the date it is due, month by month.
View calendar →Templates & walkthroughs
A blank workbook to organise your figures, and step-by-step guides to filing on gst.gov.in.
GST Return Data Templates (Excel)
Ready-made B2B, B2C, credit/debit note, HSN and purchase registers, plus a GSTR-3B summary sheet that rolls them up. Free download, no sign-up.
Download .xlsx ↓How to File GSTR-1
Every table of GSTR-1 in order — B2B, B2C, exports, notes, HSN summary — then generating the summary and filing.
Read the walkthrough →How to File GSTR-3B
The questionnaire, Tables 3.1 to 5.1, ITC set-off against GSTR-2B, paying the cash shortfall, and filing with DSC or EVC.
Read the walkthrough →These tools give standard-formula estimates for planning. GST rates, thresholds, late-fee caps and set-off rules have all changed by notification in the past — always confirm the final figure on the GST portal or with a professional before you file or pay. This site is an independent educational resource and is not a filing service.