Indian SMB owners ask us this question more than any other: “What will a custom ERP cost?” The honest answer in 2026 is that good ones land between ₹6 lakh and ₹40 lakh, and where you fall in that range depends almost entirely on three things: how many modules you actually need, how exotic your workflow is, and how patient you can be about scope.
This is a no-fluff breakdown — what goes into the bill, where most projects bleed money, and when you absolutely shouldn’t build custom in the first place.
पहले First: should you even build custom?
About 70% of Indian SMBs that ask us for a custom ERP don’t actually need one. Their pain is a Tally + 4 Excel sheets + a WhatsApp group held together by hope, and the right answer is not a six-month custom build — it’s a ₹4,000/month Zoho One subscription with a weekend of consulting to set it up properly.
Custom ERP makes sense when:
- Your workflow has irreducible quirks — e.g. a textile distributor running an unusual barter-credit system with 200 small retailers; a clinic chain with a four-stage referral commission that no SaaS supports.
- You’re paying SaaS user-fees that hurt — once you cross 50 active users on Zoho One, the monthly bill outpaces what a one-time custom build would’ve cost in 18 months.
- You need a customer / vendor portal the SaaS can’t embed your branding into.
- You’re trapped by data export — Zoho/Tally are easy to put data into and surprisingly hard to get it out of, especially when you want it in real time, joined with other systems.
- You’ve outgrown the SaaS’s assumptions — multi-entity / multi-country / consolidated billing / agentic AI on top of your business data.
If none of these apply, do yourself a favour and don’t build. Zoho One at ₹3,000/user/month or TallyPrime at ₹18,000/year does the job for ~70% of Indian businesses. We’ll happily tell you that on a 30-minute call — we’d rather you save the lakhs than pay us to build something you don’t need.
हिस्से Where the money actually goes
Here’s the real anatomy of an ERP quote in India in 2026:
| Bucket | Hours | Cost range |
|---|---|---|
| Discovery & design | 80–120 | ₹1.2L – ₹2L |
| Core platform (auth, roles, audit, UI, infra) | 120–160 | ₹1.8L – ₹2.4L |
| Inventory module | 120–180 | ₹1.8L – ₹2.7L |
| Billing + GST module | 140–200 | ₹2.1L – ₹3L |
| Each additional module (HR, manufacturing, CRM, finance) | 120–200 each | ₹1.8L – ₹3L each |
| Integrations (Tally, GSTN, e-Way Bill, Razorpay) | 60–120 each | ₹90K – ₹1.8L each |
| Reporting / dashboards | 80–140 | ₹1.2L – ₹2.1L |
| Deployment & hardening | 40–80 | ₹60K – ₹1.2L |
| Three months free support | — | (included by us, paid extra elsewhere) |
A “starter” custom ERP — inventory + billing + GST + dashboards, single-branch — lands around ₹6–9 lakh. Add manufacturing or multi-branch and you’re at ₹10–14L. A full enterprise replacement (HR, payroll, finance consolidation, multi-entity, multi-currency, customer portal) lands at ₹25–40L.
समाकलन India-specific integrations that almost always show up
The cost line that surprises founders most is integrations. None of these are technically hard, but each one has India-specific quirks that take time:
- GSTN APIs — e-Invoice IRN generation, GSTR-1 / GSTR-3B preparation. The GSTN portal changes their schema 2-3 times a year. Budget ~₹90K-1.5L for first integration, ~₹30-50K/year ongoing.
- e-Way Bill — legally required if you ship goods worth more than ₹50K. ~₹60-90K.
- Tally sync — bidirectional data sync (sales/purchase/vendor master). The TDL (Tally Definition Language) is its own beast. ~₹1.5-2.5L if you need real-time, ₹75K-1L for nightly sync.
- Razorpay / payment links — for customer invoicing. ~₹40-80K.
- WhatsApp Cloud API — for order updates and payment reminders. ~₹60K-1L (excluding template approval time).
- Shiprocket / Delhivery — if you also ship physical. ~₹50-90K.
गलतियाँ The four mistakes that bloat ERP budgets
1. “Just one more module” syndrome
What starts as “just inventory + billing” in week one becomes “also payroll, also a customer portal, also a vendor portal, also a mobile app for our sales guys” by week six. Each addition is fair on its own, but the cumulative scope grows by 2-3× and the timeline doubles.
Fix: Define Phase 1 in writing with strict scope. Anything new goes into Phase 2 at separately quoted cost. Most teams skip Phase 2 once they see Phase 1 cover 80% of their need.
2. Hiring the cheapest vendor
The ₹3.5L quote you got — the one that’s ₹4L cheaper than ours — will likely become a ₹12L project by month six because of rebuilds, missed integrations, and the team disappearing after the first invoice clears. We’ve walked into half-finished ERP projects 11 times in the last 2 years; the original vendor was always “the cheapest quote.”
3. No data migration plan
You’re replacing 7 years of Tally data, 4 Excel sheets, two Google Sheets and a half-remembered Access database. Migrating that cleanly is its own mini-project — budget ₹50K-1.5L specifically for it.
4. Forgetting maintenance
GSTN changes their API. e-Way Bill adds a mandatory field. Your accountant wants a new report. Budget 15-20% of the build cost per year for maintenance. A ₹10L ERP needs ~₹15-20K/month of senior engineer time.
Build vs Buy — a decision matrix
| Situation | Recommendation |
|---|---|
| < 20 employees, standard workflow | Zoho One (₹3K/user/month) |
| < 50 employees, accounting-heavy | TallyPrime + Zoho CRM |
| Manufacturing, 20-100 employees | Frappe ERPNext self-hosted + customisation (₹2-5L customisation) |
| Unique workflow, 30+ users, fast SaaS bill | Custom ERP, ₹8-18L typically |
| Multi-entity, multi-currency, >100 users | Custom ERP, ₹25-40L, or evaluate Odoo Enterprise |
| Customer-facing portal with your branding | Custom ERP or custom portal on top of Zoho via API |
What you should demand in any ERP contract
- Source code on your GitHub from day one — not at “final delivery,” from the first commit.
- Fixed-price, written quotation with scope and milestones. Hourly-billing ERPs always overrun.
- Weekly demo videos — you watch the product come alive, no surprises at delivery.
- Three months of free post-launch support. If your vendor says “support starts at ₹X/month from day one,” walk away.
- Domain, hosting, database credentials transferred to you on final payment. Your data, your control.
- Documentation — a user manual for your team and a technical doc for the next developer who touches the code.
- An exit clause: if at any milestone you decide to stop, you get the source code as-is and there’s no penalty.
An ERP is not a one-time purchase — it’s a 5-year relationship. Pick a vendor on whether you trust them to still be answering your WhatsApp messages two years from now, not just on the lowest line on the quote.
How we quote ERPs at Antarix
We do a free 30-minute scoping call where we listen, ask the boring questions (“What’s actually breaking on Tally?”) and then send you a fixed-price written quote within 24 hours. We’ll often recommend you don’t build — if Zoho One or ERPNext gives you 80% of what you need, we’ll say that. We’d rather earn your trust on the smaller projects we’re actually right for than push you into a ₹10L mistake.
If you do need custom, every project ships with three months of free post-launch support, source code on your GitHub from day one, and an optional cancel-anytime retainer for ongoing care.
See our ERP service in full or tell us about your business — we’ll reply within 24 hours with a thoughtful written response, not a sales call.
Karan Mehta leads platform engineering at Antarix Technology. 13 years building back-end systems — previously at Cred and AWS. He has shipped nine custom ERPs for Indian SMBs and rescued four half-built ones. Reach him on WhatsApp or info@antarixtech.com.