GST 2.0 slabs 0% · 5% · 18% · 40% from 22 Sep 2025Special rates 0.25% & 3% stones · precious metalsLate fee ₹50/day ₹20/day for nil returnsLate-fee cap ₹2,000 – ₹10,000 by turnoverInterest 18% p.a. on tax paid lateIntra-state CGST + SGST split equallyInter-state IGST full rateGSTIN 15 characters with a check digitGST 2.0 slabs 0% · 5% · 18% · 40% from 22 Sep 2025Special rates 0.25% & 3% stones · precious metalsLate fee ₹50/day ₹20/day for nil returnsLate-fee cap ₹2,000 – ₹10,000 by turnoverInterest 18% p.a. on tax paid lateIntra-state CGST + SGST split equallyInter-state IGST full rateGSTIN 15 characters with a check digit
bydigitalGST Tools
GuidesAboutContact

GST calculators

🧮GST CalculatorAdd or remove GST with the CGST, SGST or IGST split.🔄Reverse GST CalculatorFind the base price and tax inside a GST-inclusive amount.⏰GST Late Fee & Interest CalculatorLate fee and 18% interest for a delayed GSTR-3B or GSTR-1.📈GST Profit Margin CalculatorCost price to selling price with margin, GST and cess.🔎GSTIN ValidatorCheck a GSTIN’s format, checksum, state and PAN.

Invoices & billing

🧾GST Invoice GeneratorA GST-ready tax invoice with auto totals, saved as PDF.📋Quotation MakerProfessional GST quotations with logo, bank details and terms.📒Billbook ToolBills, party book, numbering and balance tracking on your device.

GST guides

📘GST 2.0 explainedThe 5%, 18% and 40% slabs and what changed.📘How to calculate GSTAdd and remove GST formulas with examples.📘CGST vs SGST vs IGSTWhich tax applies within and across states.📘GST invoice rulesMandatory fields, copies and time limits.📘Quotation vs invoice vs proformaWhen to use each document.
All 8 tools are free, need no sign-up and run in your browser.Who builds bydigital →
Home › Support us

Help keep these GST tools free

A small donation keeps bydigital free, private and up to date with GST changes.

Every tool on bydigital.in is free, unlimited and private: no accounts, no subscriptions and no locked features. If a tool saved you time or money, you can support the work with a small donation.

❤️ Donate via Razorpay

Payments are handled by Razorpay (UPI, cards, netbanking and wallets) on its official page razorpay.me/@mantukumar1708. Even ₹20 helps.

Where your support goes

Donations pay for the domain and hosting and for the time spent updating tools when the GST Council changes rates, late-fee caps or invoice rules.

Free ways to help

  • Share a tool with a friend, your business WhatsApp group or your CA.
  • Report a wrong number or a bug through the contact page.
  • Suggest a tool you wish existed.

A note on donations

Donations are voluntary contributions to a free web project. They are not payments for goods or services, do not unlock features and are not tax-deductible.

Mantu Kumar, founder of bydigital

Written and maintained by Mantu Kumar

Mantu runs small online businesses from Navi Mumbai and built bydigital for the GST sums he needed every week. He checks each calculator against the CGST Act, GST Council decisions and worked examples. He is not a chartered accountant, so results are estimates and the pages tell you when to confirm with one.

Read Mantu’s profile