Fact-check notes
Last fact-checked: 2026-05-30
GST caution: GST return limits, IMS, IRN reporting, ITC, appeal windows and rate classifications should be checked against the live GST portal, CBIC notifications and current utilities before filing.
Research note: This page uses Batch 15 competitor-gap research and supplied forward-looking 2026 topics. Treat future-dated form or section references as planning notes until official utilities confirm them.
Use this page as preparation guidance. A professional should verify the active law year, notification, portal utility and source records before filing or taking a tax position.
What this covers
At the start of a financial year, businesses should set a clean invoice number series that stays unique, chronological and GST/e-invoice compliant.
- Invoice numbers should be unique for the financial year and GSTIN/business unit setup.
- E-invoice and accounting software should use the same series logic.
- Credit notes and debit notes need their own controlled numbering.
- Series changes should be documented before issuing invoices.
Who this is for
- Business starting April billing.
- Company migrating accounting software.
- Multi-branch GSTIN setting invoice series.
- CA reviewing invoice compliance.
Documents and data to verify
- Invoice format and series policy.
- Accounting software settings.
- E-invoice upload configuration.
- Credit/debit note numbering rules.
Common mistakes to avoid
- Duplicate invoice numbers after software migration.
- Changing series without documentation.
- Mismatch between invoice PDF and e-invoice data.
- No branch-wise numbering control.
How to proceed
- Confirm the applicable financial year, assessment year, taxpayer type, state and portal status before acting.
- Reconcile portal data with books, AIS/Form 26AS, GST returns, contracts, invoices, bank statements and source documents.
- Prepare a written computation, checklist, filing note or response with assumptions clearly stated.
- Download acknowledgements, challans, workings and evidence after filing or submission.
FAQs
Can WorkIndex help with this?
Yes. Post the facts and documents; relevant experts can quote for filing, advisory, reconciliation, registration, appeal support or ongoing compliance.
Is this page final legal advice?
No. Use it to prepare. A professional should verify the active law year, notification, portal utility and records before filing or taking a tax position.
What should I mention while posting?
Mention the year, state, form, deadline, amount involved, documents available, portal status and whether you need filing, correction, advisory or representation.