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GSTR1 DATA REQUIREMENTS & SOLUTION OPTIONS
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THE CORE PROBLEM:
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Bank Statement ALONE cannot generate GSTR1 JSON because it lacks:
- Customer GSTIN
- Customer State/POS
- Invoice numbers
- Service type (HSN/SAC)
- B2B vs B2CS classification
- Tax calculations

MY RECOMMENDATION: Simple Customer Master + CLI Entry
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APPROACH:
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1. Keep a simple customers.json file (one-time setup)
2. Use Python CLI to enter invoice details
3. Script generates JSON automatically
4. Updates Income Register

CUSTOMER MASTER (customers.json):
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{
  "Render Wise": {
    "gstin": "07AAICR0930R1ZX",
    "legal_name": "Render Wise Solutions Pvt Ltd",
    "state": "07",
    "sac": "998314"
  },
  "Sky Fit": {
    "gstin": "07AEWFS8962B1ZD",
    "legal_name": "Sky Fit",
    "state": "07",
    "sac": "998391"
  }
}

CLI WORKFLOW:
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$ python gstr1_entry.py --quarter Q4 --year 2025

Customer (1=Render, 2=Sky, 3=Umento): 1
Amount (excl tax): 200000
Date (DD-MM-YYYY): 15-10-2025
→ Creates Invoice HB-10-001 for ₹236,000

Need to know from you:
1. Do you issue invoices when paid, or separately?
2. Same customers each quarter?
3. OK with CLI prompts, or prefer editing JSON/Excel file?

Let me know and I'll build the exact tool you need!