VyaparStack
    VyaparStack
    Tax SimulatorCapabilitiesSavings ToolPricingStatutory FAQBlog
    100% CBIC Rule 46 & Section 31 Compliant

    Need Section 31 Tax Invoices with Direct UPI Settlements?

    Stop losing 2% to payment gateways. VyaparStack generates consecutive alphanumeric invoices, embeds NPCI UPI QR codes for instant 0% settlement, and exports GSTR-1 Table 4A JSON.

    Launch Free Sandbox
    VyaparStack
    VyaparStack

    Automated CGST/SGST/IGST tax calculations, Section 31 compliant PDF tax invoices, and instant zero-fee NPCI UPI QR settlements for Indian freelancers, consultants, and solopreneurs.

    Product

    • Tax Simulator
    • Statutory Capabilities
    • Savings Calculator
    • Pricing Plans
    • Free Tools Suite →
    • Compliance Blog
    • Statutory FAQ

    Free Statutory Tools

    • GSTIN Validator
    • Reverse GST Calculator
    • SAC Code Finder
    • UPI QR Generator
    • MSME Interest Engine

    Statutory & Legal

    • About Platform
    • Terms of Service
    • Privacy Policy (DPDPA)
    • Contact Support
    © 2026 VyaparStack. All rights reserved. CGST Act Section 31 Compliant Architecture.
    Home/Free Tools/Reverse GST Calculator
    Statutory Rule 54 Precision

    Reverse GST Calculator (Backwards Tax Engine)

    Convert all-inclusive client budgets into pre-tax Section 31 invoice values. Automatically calculates the taxable base, splits 50/50 CGST & SGST for intra-state supplies, or applies 100% IGST for inter-state supplies with 2-decimal paise precision.

    ₹

    The total contract or lump-sum payment agreed with your client.

    Most IT, software, marketing & advisory services fall under 18% SAC.

    Intra-State Supply (CGST + SGST)
    Pre-Tax Taxable Base

    ₹42,372.88

    Line item value for invoice

    CGST (9%)

    ₹3,813.56

    Central tax share

    SGST (9%)

    ₹3,813.56

    State tax share

    Total Tax Component:₹7,627.12
    Raise Invoice with these AmountsBack to All Tools