GSTR-1 affects your customer ITC
B2B invoice errors in GSTR-1 can affect customer ITC and later reconciliation. Invoice-wise data must be checked before submission.
Situations this page is built for
- You have B2B invoices to report.
- Customer complains ITC is not visible.
- Credit notes or amendments are needed.
- Ecommerce sales data must be reported.
- Previous period invoices were missed.
Documents and details usually required
- GSTIN and GST portal access, if already registered.
- PAN, Aadhaar, business registration and authorised signatory details.
- Sales invoices, purchase invoices, debit/credit notes and expense bills.
- GSTR-1, GSTR-3B, 2A/2B and electronic ledger downloads.
- Bank statements, ecommerce reports, e-way bills and e-invoice data where applicable.
- Notices, orders or cancellation documents, if any.
Practical process before hiring
Map GST requirement
Identify whether the work is registration, filing, reconciliation, notice reply, cancellation or advisory.
Check return data
Compare sales, purchases, ITC, tax paid and portal data period-wise.
Prepare workings
Create return summaries, reconciliations and supporting attachments before filing or replying.
File and monitor
Submit through the portal and track acknowledgements, ledgers and future compliance dates.
What to expect in India
| Work type | Typical price range | Timeline |
|---|---|---|
| GST registration or simple filing | Rs. 1,000 - Rs. 5,000 | 1-5 days |
| Monthly GST with reconciliation | Rs. 2,000 - Rs. 15,000 per month | Monthly |
| Notice/cancellation/complex support | Rs. 5,000 - Rs. 50,000+ | Case-specific |
Prices vary by document readiness, urgency, city, professional experience and whether previous periods need cleanup.
Common red flags and mistakes
- Claiming ITC without checking GSTR-2B.
- Filing GSTR-1 and GSTR-3B without reconciling turnover.
- Ignoring late fee and interest impact.
- Responding to notices without attachments.
- Waiting until the due date to arrange invoices.
What to mention when you post
- GSTIN status and business type.
- Monthly invoice count and pending return periods.
- Whether ecommerce, e-way bill or e-invoicing applies.
- Notice reference number and deadline, if any.
- Whether accounting data is ready or needs cleanup.
How to choose the right professional
- Choose someone who asks for return data before quoting.
- Check experience with your industry and transaction volume.
- Ask whether reconciliation, challan support and amendments are included.
- For notices, ask for point-wise reply with evidence.
- Clarify monthly calendar and document collection process.
Extra checks before you finalise
- Ask the professional to separate regular outward supplies, exempt supplies, reverse charge, advances and credit notes before return preparation.
- For ITC work, insist on GSTR-2B based eligibility review rather than only purchase register matching.
- If there are delayed returns, confirm the late fee, interest and cash ledger impact before any filing is submitted.
Questions people ask before hiring
What is GSTR-1?
It is the return/report for outward supplies and invoice details.
Can GSTR-1 be amended?
Certain corrections may be possible in later returns within rules.
Why does GSTR-1 matter to customers?
It feeds recipient ITC visibility.
Should books match GSTR-1?
Yes, differences should be reconciled.