GST Invoice Software in 2026: The Complete Guide to Invoicing Software India for SMBs
Manual invoicing is costing you money. Late payments, calculation errors, GST compliance issues—all because you’re still using Excel or Word templates.
In 2026, GST invoice software isn’t optional—it’s mandatory for compliance and cash flow. This guide covers everything Indian SMBs need to know about invoicing software India, billing software, and even free invoice generator options—plus how Aadir helps you invoice and get paid faster at ₹3,999/month.
Why Billing Software Matters More Than Ever
According to GST Council reports, over 1.4 crore businesses are GST-registered in India. And Tally research shows businesses using proper billing software get paid 14 days faster.
The numbers that matter for Indian businesses:
- 68% of SMBs struggle with GST compliance manually
- Late payments cost businesses 5-10% of annual revenue
- Automated invoicing reduces errors by 90%
- Professional invoices get paid 2x faster
Stop chasing payments. Start invoicing professionally.
Types of Invoicing Software India
GST Invoice Software
Generate GST-compliant invoices with automatic tax calculations. Essential for all registered businesses. Use Aadir’s Invoicing.
Billing Software
Complete billing management including quotes, invoices, and receipts. Built into Aadir’s platform.
Free Invoice Generator
Basic invoice creation tools. Good for startups, but limited features and no automation.
Accounting Integration
Connect invoicing with full accounting. Sync with Aadir’s CRM for complete financial visibility.
Key Features of GST Invoice Software
| Feature | Why It Matters |
|---|---|
| GST Compliance | Auto-calculate CGST, SGST, IGST based on location |
| HSN/SAC Codes | Built-in database for product/service codes |
| E-Invoice Generation | Generate IRN for B2B invoices above ₹5 crore |
| E-Way Bill | Auto-generate for goods transport |
| Multiple Tax Rates | Support 0%, 5%, 12%, 18%, 28% GST slabs |
| Credit/Debit Notes | Issue adjustments GST-compliantly |
| GSTR Reports | Auto-generate GSTR-1, GSTR-3B data |
| Payment Tracking | Track paid/unpaid with Analytics |
Aadir’s Invoicing includes all GST features—unlimited users, ₹3,999/month.
GST Invoice Requirements (2026)
Mandatory Fields
Every GST invoice software must include:
| Field | Requirement |
|---|---|
| Invoice Number | Unique, sequential, max 16 characters |
| Invoice Date | Date of issue |
| Supplier GSTIN | 15-digit GST number |
| Supplier Name & Address | Legal name and registered address |
| Buyer GSTIN | For B2B transactions |
| Buyer Name & Address | Complete details |
| HSN/SAC Code | Product/service classification |
| Description | Clear item description |
| Quantity & Unit | With UQC (Unit Quantity Code) |
| Taxable Value | Before GST |
| GST Rate & Amount | CGST+SGST or IGST |
| Total Amount | Including all taxes |
| Place of Supply | State code for tax determination |
| Signature | Digital or physical |
Reference: GST Invoice Rules
Setting Up Billing Software (Step-by-Step)
Step 1: Configure Business Details
Set up your company in Aadir’s Invoicing:
- Legal business name
- GSTIN (15-digit)
- Registered address
- State code
- Bank details for payments
- Logo and branding
Step 2: Add Products/Services
Create your catalog:
- Item name and description
- HSN/SAC code
- Default price
- GST rate (0%, 5%, 12%, 18%, 28%)
- Unit of measurement
Step 3: Set Up Invoice Templates
Customize your invoice design:
- Add logo and brand colors
- Include payment terms
- Add bank details and UPI ID
- Include Payment link button
Step 4: Configure Automation
Connect with Aadir’s Automations:
- Auto-send invoice on deal closure
- Payment reminders via Email
- Overdue alerts via SMS
- Receipt on payment confirmation
Step 5: Integrate with CRM
Link invoices to customers in Aadir’s CRM:
- Track customer payment history
- View outstanding amounts
- Calculate customer lifetime value
- Segment by payment behavior
Invoice Automation Workflows
Connect your invoicing software India with Aadir’s Automations:
Invoice Creation
- Deal won in CRM → Auto-generate invoice
- Service completed → Send invoice via Email
- Subscription renewal → Auto-invoice with payment link
Payment Reminders
- Invoice sent → Reminder in 3 days via Email
- Still unpaid → Day 7 reminder via SMS
- Overdue → Day 14 WhatsApp follow-up
- Seriously overdue → Voice AI call
Payment Received
- Payment confirmed → Send receipt via Email
- Update CRM status automatically
- Request review via Reviews & Reputation
- Trigger next service/delivery
Recurring Invoices
- Monthly retainer → Auto-generate on 1st
- Subscription → Invoice before renewal date
- EMI → Generate installment invoices automatically
Free Invoice Generator vs. Paid Billing Software
| Feature | Free Invoice Generator | Aadir Invoicing |
|---|---|---|
| Basic Invoices | ✅ | ✅ |
| GST Compliance | Limited | ✅ Full |
| E-Invoice/IRN | ❌ | ✅ |
| Payment Links | ❌ | ✅ via Payments |
| Auto-Reminders | ❌ | ✅ via Automations |
| CRM Integration | ❌ | ✅ Built-in CRM |
| Multi-Channel Send | ❌ | ✅ Email, SMS, WhatsApp |
| Reports & Analytics | Basic | ✅ Full Analytics |
| Recurring Invoices | ❌ | ✅ |
| Team Access | Limited | ✅ Unlimited users |
Free tools work for occasional invoicing. Growing businesses need Aadir.
Invoicing by Industry
Real Estate
- Booking amount invoices
- Milestone-based billing
- GST on construction services (12%/18%)
- Aadir for Real Estate
Healthcare & Clinics
- Consultation fee invoices
- Lab test billing
- GST exemptions for healthcare
- Aadir for Healthcare
Coaching & Education
- Course fee invoices
- Batch billing
- GST on educational services
- Aadir for Coaching
Agencies
- Retainer invoices
- Project milestone billing
- Time-based billing
- Aadir for Agencies
Professional Services
- Hourly/fixed fee invoices
- Expense reimbursement
- Advance payment tracking
- Aadir for Professional Services
eCommerce
- Order invoices with shipping
- Return/refund credit notes
- Multi-state GST handling
- Aadir for eCommerce
GST Compliance Checklist
Invoice Compliance
- ✅ Sequential invoice numbering
- ✅ Correct GSTIN format validation
- ✅ HSN/SAC codes for all items
- ✅ Proper tax calculation (CGST+SGST or IGST)
- ✅ Place of supply determination
- ✅ Reverse charge notation where applicable
E-Invoice Requirements (B2B > ₹5 Crore)
- ✅ Generate Invoice Reference Number (IRN)
- ✅ QR code on invoice via QR Codes
- ✅ Digital signature
- ✅ Real-time upload to IRP
Record Keeping
- ✅ Maintain invoices for 6 years
- ✅ Backup all digital records
- ✅ Track amendments and credit notes
Reference: E-Invoice Portal
Billing Software: Comparison
| Feature | Aadir | Tally | Zoho Invoice | Vyapar |
|---|---|---|---|---|
| Price/month | ₹3,999 | ₹10,800/year | ₹4,999+ | ₹3,999/year |
| Unlimited Users | ✅ | ❌ | ❌ | ❌ |
| GST Compliance | ✅ | ✅ | ✅ | ✅ |
| E-Invoice | ✅ | ✅ | ✅ | ✅ |
| CRM Integration | ✅ Built-in | ❌ | Separate | ❌ |
| Email/SMS/WhatsApp | ✅ | ❌ | Limited | Limited |
| Payment Collection | ✅ | Add-on | ✅ | ✅ |
| Marketing Automation | ✅ | ❌ | ❌ | ❌ |
Aadir gives you invoicing + CRM + automation in one platform.
Compare: Aadir vs. Zoho | Aadir vs. HubSpot | Aadir vs. GoHighLevel
Why Indian SMBs Choose Aadir
Standalone billing software doesn’t help you grow. Aadir offers:
- Unlimited users & contacts at ₹3,999/month
- GST-compliant Invoicing with e-invoice support
- Integrated Payments for faster collection
- Auto-reminders via Email, SMS, WhatsApp
- Full CRM with payment history
- Avya AI Employee for payment follow-ups
Get Started Today
Stop chasing payments manually. Start your free trial with Aadir and automate your entire invoicing process.
Further reading:
Aadir is India’s most affordable all-in-one CRM and marketing automation platform. Unlimited users. Unlimited contacts. ₹3,999/month.