The Indian compliance calendar is relentless. GSTR-1 by the 11th. GSTR-3B by the 20th. TDS payment by the 7th. TDS return by the 31st. Advance tax every quarter. Annual GSTR-9. Each of these requires data extraction, reconciliation, review, and filing. For a business with any real transaction volume, this is 30–50 hours of finance team time per month — time that should be spent on analysis, planning, and decisions, not on data preparation.
The Aarcturus Books Monthly Compliance Calendar — Automated
| Compliance Task | Due Date | How Aarcturus Books Handles It |
|---|---|---|
| GSTR-1 (B2B sales) | 11th of month | ✓ Auto-generated from invoices — one-click filing |
| GSTR-3B (summary return) | 20th of month | ✓ Pre-filled from GSTR-1 + purchase data |
| GSTR-2B reconciliation | Monthly | ✓ Auto-match purchase register against ITC data |
| TDS payment | 7th of month | ✓ Auto-calculated — one-click challan generation |
| TDS return (Form 26Q) | Quarterly | ✓ Auto-generated from payment ledger |
| Bank reconciliation | Monthly | ✓ Auto-reconciliation via daily bank feed import |
| GSTR-9 (annual return) | December 31 | ✓ Compiled from full year transaction data |
| Advance tax | Quarterly | ✓ System calculates and reminds 7 days before due date |
Why GSTR-2B Reconciliation Is the Most Important Task Nobody Does Properly
Every month, the GST portal releases GSTR-2B — the auto-populated credit statement showing which of your suppliers have filed their GSTR-1 and at what values. Your ITC claim must match this. If you claim ₹10 lakh ITC but GSTR-2B shows only ₹8 lakh from your suppliers, the ₹2 lakh difference will be reversed in scrutiny — with interest and penalty. Aarcturus Books runs this reconciliation automatically every month, flags the mismatching invoices, and emails you a report of which suppliers to follow up with before you file GSTR-3B.
Integrated Accounting: Why Your Books Must Live With Your ERP
When accounting software is disconnected from your operations (billing, procurement, payroll), every transaction requires double-entry — once in the operational system, once in the accounting system. Aarcturus Books is built on the same data layer as Aarcturus ERP. A confirmed purchase order automatically creates the vendor payable. A dispatched invoice automatically creates the customer receivable. Payroll processed in HR posts to salary payable automatically. No re-entry. No reconciliation between two systems. Your books are always current.
The CA Portal: Giving Your Accountant What They Need Without Sharing Everything
Your chartered accountant needs access to your financial data for filing, auditing, and advisory. But you do not want to give them login credentials to your full ERP. Aarcturus Books includes a dedicated CA portal with configurable access — your CA can see ledgers, download GST data, review bank reconciliation, and generate reports, without access to payroll, HR, or procurement. It is the right level of access, properly structured.