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Billing & GST Compliance · Production-ready

BillDEEP

A multi-tenant billing and GST compliance platform built for India. BillDEEP issues compliant invoices, writes a double-entry ledger on every transaction, and generates GSTR-1 and GSTR-3B return data — with formal proofs underpinning the protocol it runs on.

Problem → Solution → Outcome

Billing and compliance, reconciled at source

Problem

Billing tools and GST compliance usually live in separate systems. Invoices are raised in one place and reconciled against tax requirements in another — creating errors, mismatches and painful rework at filing time.

Solution

BillDEEP keeps invoicing GST-aware from the first keystroke: correct tax splits, a double-entry ledger written automatically, period locking enforced at the database, and return data generated directly from the books.

Outcome

Accurate, auditable invoices and return-ready GSTR-1 / GSTR-3B data — with traceable accounting behind every number.

Capabilities

A complete billing engine for Indian business

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Full GST Invoicing

B2B, B2C, B2G and export invoices with correct CGST / SGST / IGST / Cess splits, credit notes, and payments with TDS.

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GSTR-1 & GSTR-3B

Generates GSTR-1 (all report tables incl. Documents Issued), GSTR-3B, and the IFF for QRMP filers.

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Double-Entry Ledger

Every transaction auto-writes a balanced ledger entry — Sales Register, AR Aging, Cash Position and Income Statement fall out of the books.

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Period Locking

Filed and locked periods are enforced by database triggers, plus a late-fee and interest calculator.

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POS & Barcode

USB and camera barcode scanning with auto-fill from the item master, and a stock receive / GRN workflow.

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Roles & MFA

Owner / Manager / Cashier / Auditor roles with per-user overrides, TOTP MFA, Argon2id hashing and rotating JWT keys.

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Tally & Bulk Import

Tally Prime / ERP 9 XML export (masters + vouchers) and bulk CSV import for customers and items.

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DPDPA Compliance

Consent management, data export, right-to-erasure and a DPO contact endpoint built in.

Engineering evidence

Correctness you can verify

Strict
TypeScript compiles cleanly under strict mode
Lean 4
Formal proofs of protocol state machine & encoding injectivity
DB-enforced
Period locking and integrity enforced at the database
Multi-tenant
Tenant-isolated, containerised deployment
Who it's for

Built for compliant billing at scale

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SMEs & Retailers

Businesses needing GST-correct invoicing and POS without juggling multiple tools.

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Accounting Teams

Finance teams that want billing, ledger and return data aligned at source.

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Service Providers

Multi-client billing with tenant isolation and Tally hand-off.

Works well with

Pairs with LedgerShield

BillDEEP's structured invoice, payment and ledger data reconciles cleanly against bank statements in LedgerShield — one financial backbone, from invoice to reconciliation.

See BillDEEP on your data

Book a walkthrough and we'll run a real GST invoicing and return cycle with you.