Know your monthly GST on the 5th, not the 15th. Built for Indian SMBs who'd rather run their business than chase their CA. Fast invoicing, vendor bills with auto-ITC, and ready-to-upload GSTR JSON — in your browser.
Everything a small business needs
Stop bouncing between Tally, Excel sheets, WhatsApp PDFs, and your CA's clerk.
Pick a customer, pick items from your product master, CGST/SGST/IGST splits automatically. Save as draft or download a signed PDF.
Works in your browser — no Tally install, no ₹18,000 licence, no "which laptop is your data on" headaches.
GSTR-1 and GSTR-3B in the exact format gst.gov.in accepts. Upload, pay, done — without a CA for routine months.
Track who you sold to, who owes you, what you quoted. Built-in CRM, not a separate tool.
Record vendor bills. Input tax credit flows into your GSTR-3B automatically — no forgotten bills on the 20th.
Every filing download hashed (SHA-256). Daily off-site backups to encrypted storage. If there is ever a dispute, we can prove exactly what you filed.
When month-end comes
You've already recorded invoices and vendor bills as you went. On the 5th, we hand you the JSON gst.gov.in accepts. Upload, pay, done — no CA chase, no Excel templates.
Month closes → net GST number is ready. No CA chase, no Tally export.
GSTR-1 + GSTR-3B in the official V4.0 schema. Upload and file in minutes.
SHA-256 audit trail. If there is ever a dispute, we can show the exact bytes you filed.
⚠️ Not tax advice. We compute your numbers; your CA signs off.
March 2026
ReadyOutput GST
₹48,200
on 42 invoices
Input credit
₹35,800
from 7 bills
Net payable
₹12,400
by 20 Apr
GSTR-1
Outward supplies
GSTR-3B
Net payable
Built for your business
21bill is one product — but different trades have different daily tasks. These landing pages walk through each workflow.
Counter billing, udhaar, stock tracking, monthly GST — one app that fits on a phone or a shared counter laptop.
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SAC codes, proforma invoices, payment reminders, TDS tracking — everything a solo professional bills a client for.
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IGST / CGST-SGST split by place-of-supply, HSN lookup, e-way bill reference — built for inter-state wholesale.
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Look up any HSN or SAC code
Every GST invoice needs the right HSN (for goods) or SAC (for services) code. Our directory has 20+ of the most-used codes with plain-English FAQs.
HSN 1006 5% GST Rice
HSN 1101 5% GST Atta / Wheat Flour / Maida
HSN 3401 18% GST Soap (bath, laundry, detergent)
HSN 6109 5% GST T-shirts & Vests
HSN 5208 5% GST Cotton Fabric (woven)
HSN 8517 18% GST Mobile Phones
SAC 9983 18% GST Consulting & Professional Services
SAC 9963 5% GST Restaurant Services
Every feature you see in 21bill is available as a clean, well-documented API. Generate invoices from your website, e-commerce store, or internal tools in minutes.
import { Bill21 } from "@21bill/node";
const client = new Bill21(process.env.BILL21_KEY);
const invoice = await client.invoices.create({
customer: "cus_9hF2", // GSTIN auto-fetched
items: [
{ name: "Cotton Fabric", qty: 12, rate: 850 },
{ name: "Silk Blend", qty: 4, rate: 2400 },
],
send: ["email"], // 1-tap delivery
});
// → invoice.pdf_url, invoice.gst { cgst, sgst, igst }21bill's AI tells you your monthly GST in plain English — output tax, ITC, net payable. You file it yourself in 60 seconds, or hand the JSON to your CA. Either way, no surprises on the 20th.
From the blog
Tool comparisons, GST explainers, and counter-workflow guides. No SEO filler — each post is written to answer one specific question.
Most Indian SMBs run billing under one login shared across the whole team. Here's why that breaks as you grow, and how role-based access actually works in a modern billing tool.
Read →
How-toWhatsApp and email templates for chasing overdue invoices — calibrated for Indian business culture. Friendly at 7 days, firm at 30, legal at 60. Copy, paste, get paid.
Read →
Tax guideIndian SMBs mix up these three documents constantly. Here's a plain-English guide to what each one is, when you legally need which, and what GST implications follow.
Read →
Invitation only
21bill is provisioned for invited organisations. Talk to our team to discuss fit and request access for your business.
Tell us about your organisation and we'll get back to you with next steps.
"Switched from Tally to 21bill last month. My CA actually thanked me. The GSTR exports just work."
"The AI payment matching saved us 15 hours every month. Worth way more than ₹199."
"We integrated the API into our Shopify store in one afternoon. Customers get GST invoices automatically."
Already a 21bill tenant? Sign in. New to 21bill? Talk to us about getting your team onboarded.