GST-native from day one
GST billing software for Indian construction firms
e-Invoice IRN generation, e-Way Bill for material movements, GSTR-1 / 3B summaries, HSN/SAC on every invoice line, IGST/CGST/SGST place-of-supply logic — without per-document caps.
14-day free trial · Cancel anytime · GST-native from day one
GST in construction is harder than retail GST. Place-of-supply for inter-state contracts, RCM on transport, GTA invoices, 18%/12%/5% slab juggling on different work categories, e-Way Bill for steel/cement movements — every one of these is a Notice waiting to happen. Rebaar bakes them all in at the invoice level.
What you actually get
e-Invoice IRN with QR — no document caps
Connect your own NIC sandbox or GSP credentials and Rebaar generates compliant JSON, POSTs to the IRP, and stores the signed IRN + QR on the invoice. Without your GSTIN and credentials there is no e-Invoice button — Rebaar never makes up an IRN.
e-Way Bill for material movements
Construction firms move steel, cement, aggregate between stores and sites — every move ≥ ₹50k needs an EBN. Rebaar generates the AES-256-ECB-encrypted handshake the NIC API expects, attaches the EBN to the delivery note.
GSTR-1 and 3B summary
Output and input GST, the net payable, a B2B / B2C split and a rate-wise summary for the period, built from the invoices and costs already in Rebaar. GSTR-1 comes as CSV files for the GST Returns Offline Tool, with a workbook for your CA. Your CA checks them and files on the portal — no adding up in Excel.
Place-of-supply automatic
IGST vs. CGST+SGST split decided by the client's state vs. your supply state. The invoice header carries the place-of-supply code on every line.
HSN / SAC code library
Construction-relevant HSN/SAC codes pre-loaded (998311 works contract, 998341 architectural services, 7308 fabricated steel, etc.). Each BOQ line carries its code; the invoice HSN summary writes itself.
RCM and GTA invoices
Reverse-charge invoices for goods-transport-agency transactions. Separate ITC ledger, separate GSTR-3B treatment.
Audit trail for every GST mutation
Every GST-affecting change (invoice issued, voided, refunded, IRN cancelled) is recorded in the audit log with actor, timestamp and a summary of the change. Tax officers love a clean trail.
Rebaar vs typical GST billing tools
| Feature | Rebaar | Generic GST tools (Zoho Books, ClearTax Billing) |
|---|---|---|
| Construction-specific HSN/SAC pre-loaded | ✓ Yes | — No |
| RA bill format with retention | ✓ Yes | — No |
| e-Invoice IRN — bring your own GSP | ✓ Yes | Vendor-locked GSP |
| e-Way Bill from inside invoice | ✓ Yes | Separate workflow |
| GSTR-1 / 3B summary | ✓ Yes | ✓ Yes |
| Project / BOQ / vendor linkage | ✓ Yes | — No |
| Indian payroll EPF/ESI/PT bundled | ✓ Yes | — No |
Based on publicly available product information at time of writing. Competitor features evolve — verify before signing.
Frequently asked questions
Is e-Invoice mandatory for my construction firm?
e-Invoice (IRN generation) is mandatory in India for B2B invoices once your annual aggregate turnover crosses ₹5 crore (as of FY 2026-27 — the threshold has been progressively lowered). Below ₹5 cr it's optional but recommended because it makes input-tax-credit claims easier for your clients.
How does the bring-your-own-credentials model work?
You sign up for your own NIC sandbox or GSP (Adaequare, ClearTax, Cygnet, etc.). You connect those credentials in Rebaar → Settings → Integrations. Rebaar uses your account for every e-Invoice / e-Way request. We never see your data flow through our keys, and there's no per-document upcharge from us.
What happens if my GSP credentials are wrong?
The route returns a clear error message identifying which field the GSP rejected. The invoice itself is still created in Rebaar; only the IRN generation is paused. Re-attempting is one click.
Does Rebaar handle works-contract GST at 12% and 18%?
Yes. The BOQ-line tax rate is configurable per item. Pure labour contracts at 18%, works contracts with material at 18%, certain government works at 12% — pick the right slab per line, the invoice composes correctly.
Can I file GSTR-1 directly from Rebaar?
No — Rebaar does not file returns. It gives you the GSTR-1 CSV files for the GST Returns Offline Tool (B2B, B2C, credit and debit notes, HSN summary and the documents table), which makes the file you upload on the GST portal, plus a workbook for your CA with the GSTR-3B figures to type in. e-Invoices with an IRN reach GSTR-1 on their own, so they are left out of the B2B file.
What about reverse charge (RCM)?
RCM invoices (e.g. GTA transport bills you receive) are recorded as RCM-applicable. The output liability is added to your GSTR-3B; the input tax credit is taken separately. Rebaar separates the two so you don't double-count.
Is the data audit-proof for a GST officer?
Every invoice / payment / void / refund event is in the audit log with actor user, timestamp and a summary of what changed. The log is append-only at the application layer. Combined with database backups and the immutable IRN trail, this is what officers expect when they audit a construction firm.
GST shouldn't be the hardest part of running a construction firm
Try Rebaar free for 14 days. Issue your first IRN-signed invoice in under 15 minutes.