GST Tools & Calculators
Welcome to the GST compliance hub on GSTWaala. In India, Goods and Services Tax (GST) requires meticulous calculation across multiple tax slabs (5%, 12%, 18%, and 28%) and split distributions (CGST, SGST, and IGST). Navigating transactions, vendor bill reconciliations, commodity tax classification, filing delays, and credit reversals can be demanding for small businesses and tax professionals alike.
Our suite of free GST utilities is designed to simplify daily tax workflows. Whether you need to reverse-calculate the base price from an invoice, find the correct HSN/SAC code, estimate late filing fees, or calculate Section 50 interest on cash liabilities, these online tools provide CA-verified calculations instantly.
Available GST Utilities
GST Calculator
Calculate GST addition or removal with splits for CGST, SGST, and IGST components.
Reverse GST Calculator
Extract original price before tax and verify vendor calculations from total bill amounts.
HSN Code Finder
Search from a comprehensive list of 150+ goods and services HSN/SAC codes and rates.
GST Penalty & Late Fee
Calculate filing delay late fees and daily Section 50 interest penalties at 18% p.a.
GST Interest Calculator
Calculate Section 50 interest on delayed GST payments dynamically on a daily basis.
Featured GST Guides
How to Calculate GST Interest in India (2026 Guide)
Learn how GST interest is calculated under Section 50 with examples, formulas, FAQs and use our free GST Interest Calculator.
GST Late Fees & Penalties: GSTR-3B Filing Delay Guide
Learn how GSTR-3B late fees accrue daily, statutory maximum caps for Nil returns, and how Section 50 interest is calculated at 18% p.a.
Frequently Asked Questions
How does the GST Calculator work?
Our GST Calculator allows you to add or remove GST from a transaction. You simply enter the base or net amount and select the tax slab (5%, 12%, 18%, or 28%). It automatically computes the CGST, SGST, and IGST breakdowns.
What is Section 50 delayed payment interest?
Under Section 50 of the CGST Act, if a business delays depositing cash tax liabilities beyond the monthly due date, simple interest is charged at 18% per annum on the delayed cash portion. Utilized excess ITC reversals attract interest at 24% p.a.
Where can I find HSN and SAC codes?
You can use our HSN Code Finder tool to search from a list of over 150 goods and services categories. It helps you quickly identify correct commodity codes and their corresponding GST tax rates.