Free GST Billing Software in India (2026): What You Actually Get
TL;DR: Free GST billing software is real in 2026 — but most free tools stop at the printed invoice and leave your books, GST return data, TDS and MSME compliance to you. A compliant invoice needs GST 2.0 rates (5%/18%, 40% for luxury/sin), correct CGST/SGST/IGST split and HSN codes. Karr's free plan is a full accounting system at $0, not a bill generator.
Last updated: July 2026
What "GST-compliant billing" means in 2026
A valid GST invoice in 2026 carries your GSTIN, a consecutive number and date, the buyer's GSTIN for B2B sales, item-level HSN codes, and the tax worked out under GST 2.0 — the two-slab structure (5% and 18%, plus 40% on specified luxury and sin goods) in force since 22 September 2025 — split correctly as CGST+SGST within your state or IGST across states. Two thresholds sit around that invoice: GST registration itself at ₹40 lakh turnover for goods / ₹20 lakh for services (₹20L/₹10L in special-category states), and e-invoicing — an IRN on every B2B invoice — once aggregate turnover crosses ₹5 crore.
If a "free billing app" gets any of that wrong — old 12%/28% slabs in its rate list is the telltale — it is generating liabilities, not invoices.
What free tools typically include (and hide)
The free tier of most billing tools covers the visible part: an invoice form, your logo, a shareable PDF. What is usually missing is everything the invoice is supposed to feed:
- Real books. An invoice is an accounting entry. Without a double-entry ledger behind it, your "free" tool produces a pile of PDFs your CA must reconstruct at year-end — you pay the saved subscription to your accountant instead.
- GST return data. Your GSTR-1 and GSTR-3B (monthly, or quarterly under QRMP if you are eligible up to ₹5 crore) should fall out of your billing data. Many free tiers export it only on paid plans.
- TDS awareness. Pay a professional ₹50,000 in a year and TDS applies under s.393(1) Table Sl.6(iii) of the Income-tax Act 2025. Billing-only tools have no idea.
- MSME bill ageing. Buy from an Udyam-registered micro/small vendor and pay late (beyond 45 days with an agreement, 15 without) and the expense is disallowed until paid — the old s.43B(h) rule, carried into the 2025 Act. This needs live tracking.
- Caps and lock-ins. Invoice-count limits, single-device limits, and exports locked behind upgrade walls are the standard free-tier fine print. Read it.
The checklist for choosing a free plan
| Requirement | Why it matters | Bill-generator free tiers | Karr Free |
|---|---|---|---|
| GST 2.0 slabs (5/18/40) | Wrong slab = wrong invoice | Usually updated, verify | Yes, applied at posting |
| CGST/SGST vs IGST split | Interstate errors are common | Usually | Automatic by place of supply |
| Double-entry books behind bills | Year-end sanity | Rarely | Yes |
| Bank reconciliation | Catch missed/duplicate entries | Rarely | Yes |
| GST return-ready data | GSTR-1/3B without spreadsheets | Often paywalled | Yes |
| TDS thresholds watched | 2025-Act sections, auto | No | Yes |
| MSME 45-day ageing | Disallowance warning | No | Yes |
| Works offline | Counter keeps billing | Rarely | Yes — offline-first PWA |
| Turnover threshold watch | Register before you must | No | Yes |
Where Karr's free plan fits
Karr Free is $0 forever and is deliberately not a bill generator: every invoice posts real double-entry books with the correct GST 2.0 treatment, the ledger reconciles against your bank, and the compliance engine watches thresholds — GST registration turnover, TDS trigger points under the Income-tax Act 2025, MSME bill ageing, the ₹2,00,000 cash-receipt bar (old s.269ST, now ss.185–188) — and warns you in plain language before a mistake posts. It works offline at the counter and syncs later, and you never need to know a debit from a credit: the "What Happened?" wizard handles the accounting. When you outgrow free, Pro is $12/month and Business $29/month — but the free plan is not a demo; it is the product.
The honest bottom line
Free billing software is worth exactly what happens after the invoice prints. If all you need is a PDF with your logo, almost anything works. If you want the invoice to produce correct books, return-ready GST data and early compliance warnings — for free, from day one — start with Karr Free. Upgrade if you grow into it; keep using it free if you do not.
Stay compliant automatically with KARR
Karr flags non-compliance the moment you post a transaction — across 30+ countries across South Asia, the Middle East (GCC), Africa, Southeast Asia, Europe, and North America — including India, the UAE, Saudi Arabia, the UK, the USA, Canada, Australia and Singapore.
Try KARR FreeFrequently Asked Questions
Is there genuinely free GST billing software in India?
Yes. Karr's free plan is $0 and covers day-to-day GST invoicing and books. Several other tools have free tiers too — the differences show up in what happens after the invoice: correct books behind it, GST return data, TDS, and compliance warnings.
What must a GST invoice show in 2026?
Your GSTIN, a consecutive invoice number, date, the buyer's GSTIN for B2B, item-level HSN codes, taxable value, and the GST 2.0 rate split (CGST+SGST within your state, IGST across states) at the current slabs — 5% or 18% for most goods and services, 40% for specified luxury/sin items.
Do I need e-invoicing on a free plan?
E-invoicing depends on your turnover, not your software plan: once aggregate turnover crosses ₹5 crore, B2B invoices need an IRN. At that scale you have outgrown "free" — what matters is that your software generates the IRN at billing time when you get there.
What is QRMP and does my software need to support it?
QRMP lets eligible taxpayers with turnover up to ₹5 crore file GSTR-3B quarterly while paying tax monthly. Your billing software should tag and total invoice data so quarterly filing is an export, not a spreadsheet project.
When do I have to register for GST at all?
At ₹40 lakh turnover for goods or ₹20 lakh for services (₹20 lakh/₹10 lakh in special-category states). Below that you may bill without GST — good software watches your rolling turnover and warns you before you cross the threshold unregistered.
What do free billing tools usually leave out?
The books behind the bill. Common gaps: no real double-entry ledger, no bank reconciliation, no TDS handling, no MSME 45-day bill ageing, invoice-count caps, and your data locked behind an export paywall. A free bill generator that creates a compliance mess is not free.
What exactly is in Karr's free plan?
Karr Free is $0 forever and is a real accounting system, not a bill generator: GST 2.0-compliant invoicing with correct double-entry books behind every bill, plus the preventive warnings Karr is built around. Pro ($12/month) and Business ($29/month) add depth when you grow. Start free and upgrade only if you need to.
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