GSTR-3B software, tax math handled
Outward tax, eligible ITC, reverse charge and interest are auto-computed each month — review the summary and file with zero manual tally work.
As featured in
TrendingNowIndia— “Smart Billing India 2026 Review” →Used by 1,000+ businesses & freelancers
GSTR-3B software that thinks like your accountant
GSTR-3B is the monthly summary return that drives your actual GST payment. Our GSTR-3B software reads sales, purchases, RCM entries and ITC ledgers, then fills Table 3.1 (outward), 3.2 (inter-state to unregistered), 4 (eligible ITC), 5 (exempt/nil) and 6.1 (payment) automatically.
It also reconciles eligible ITC with your GSTR-2B before suggesting the final ITC figure — so you don't claim ITC that isn't yet reflected on the portal. The PMT-06 challan amount is computed in real time as you toggle ITC eligibility.
- Tables 3.1, 3.2, 4, 5, 6.1 auto-filled
- GSTR-2B reconciliation built in
- RCM payable & ITC handled separately
- Interest u/s 50 auto-calculated on late tax
- Cash ledger + credit ledger view
- Government-ready JSON for portal upload
Built for: GST regular dealers, accountants and CA firms.
Related guides
- GSTR-1 software, ready every month →
- GST billing software made for India →
- GST invoice software, simplified →
Official reference: GSTN GSTR-3B user guide — Official GSTR-3B guide on GST portal.
Smart Billing India is compatible with all your devices
Whether you're at your desk on a laptop, reviewing reports on a tablet, or invoicing on the move from your phone — your business runs smoothly across desktop, tablet, and mobile.
- Desktop & laptop ready
- Tablet-friendly layouts
- Mobile-first invoicing on the go
Run billing, GST, and books
from one clean workspace.
From quotation to payment — every step of your sales, purchase and GST workflow in one app.
Preview first.
Edit only when you mean to.
Saved invoices open in a safe read-only preview so accidental clicks never change your books. Hit Edit when you actually need to make changes — your team and CA see the same protection.
- 1Open an invoiceClick any row from your invoice list.
- 2See it in preview modeAll fields are locked. View, print, or download safely.
- 3Click Edit to make changesInputs unlock. Make changes and save.
Invoices
3 of 28Click INV-0042 to open it
We designed a faster invoice experience with lower fees
Create a beautiful GST invoice with just a click.
Your clients deserve a great payment experience. Smart Billing India generates stunning, minimalist invoices that include your logo, GSTIN and client details in a few clicks. Send as many invoices as you like — no per-invoice fees, ever.
Trusted by founders, CAs & growing SMBs across India
“Smart Billing India made GST filing so easy. We raise an invoice in one click and the GSTR-1 is already prepared at month end.”
“Migrated from Tally in a weekend. WhatsApp sharing and GSTR-1 prep from the same screen saves hours every week.”
“As a CA I handle 40+ clients here. Role-based access and the GSTR-2B reconciliation are easily the best in any Indian billing app I've used.”
Built by an Indian founder, for Indian businesses
Entrepreneur & founder of SmartBillingIndia.com. On a mission to digitize billing for India's small businesses with fast, GST-ready invoicing that just works.
Simple pricing. No surprises.
Start free. Upgrade when you outgrow it. Every plan includes the full GST‑ready core.
For solo founders just getting started with GST billing.
Get startedEverything a growing SMB needs to run GST end‑to‑end.
Start free trialFor multi‑branch businesses, CAs and finance teams.
Talk to salesAll prices exclusive of GST. Cancel anytime.
How we compare to other tools
Side-by-side with Zoho Books, ClearTax and Vyapar — at a fraction of the price.
Comparison based on publicly listed plans as of 2026. Features may vary by tier.
GSTR-3B software — FAQs
GSTR-3B is the monthly summary GST return that reports outward supplies, eligible ITC and net tax payable — it drives the actual GST payment.
Yes — with portal credentials it pulls GSTR-2B and matches it against your purchase book before suggesting eligible ITC.
Yes — nil GSTR-3B is supported and can be filed with the SMS/EVC flow on the portal.
Interest under section 50 is auto-calculated at 18% per annum on the cash portion of late tax.
Yes — both ledgers are visible alongside the GSTR-3B preview so you can plan the PMT-06 payment.
Send your first invoice in 60 seconds.
Free forever for small businesses. No credit card required — set up your business, add items, and start billing today.
- GST-ready invoices
- WhatsApp & UPI sharing
- Auto GSTR-1 / 3B / 9
- Multi-business & team
- Free forever for starters