Are you replacing Tally with the custom ERP?

No. Tally stays as the financial system of record. The custom ERP handles the operational layer that Tally was never designed for: multi-warehouse FIFO, batch tracking, sales workflows, customer portals, sales rep mobile apps, founder dashboards. The two systems sync at the document boundary.

How do Tally and the custom ERP exchange data?

We push final sales invoices from the custom ERP to Tally as Tally vouchers using the Tally ODBC connector or a custom XML integration. Master data such as customers, products, and tax ledgers can flow in either direction. The sync is bidirectional for masters and one-way for documents.

Will our CA still use Tally?

Yes. The CA continues to use Tally exactly as before. GSTR-1, GSTR-3B, and 2B reconciliation are filed from Tally. The custom ERP does not touch statutory output. This is deliberate. The compliance ecosystem in India runs on Tally and we do not disrupt it.

What about quotations that exist in both systems?

The custom ERP becomes the source of truth for quotations because that is where the operational workflow lives. Quotations are versioned, attributed to a sales person, run through an approval chain, and tracked to conversion. When a quotation converts to an order and then to a tax invoice, only the final invoice gets pushed to Tally.

What does a Tally + custom ERP setup cost?

Tally subscription stays at whatever you currently pay (₹2k to ₹15k a year for Tally Prime). The custom ERP build runs ₹5L to ₹15L depending on scope, plus hosting at ₹1500 to ₹15k a month. An optional Technology Partner retainer runs ₹50k to ₹1.5L a month for ongoing evolution and support.

Can we move off Tally later if we want to?

You can, but most clients do not. Tally remains the cleanest answer for Indian financial compliance even at ₹50cr+ revenue. The custom ERP we build is designed to coexist with Tally indefinitely. If you do eventually move off Tally, the custom ERP stays intact; we just rewire the document push.

Compare · Tally + Custom

Tally and a custom ERP together. Not Tally or custom.

Tally is the financial system of record. A custom ERP is the operational system of record. The pair beats either alone for most ₹5cr to ₹50cr Indian businesses. Here is the division of responsibility we have run for five years.

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Side by side

The comparison in one table.

Honest framing. Where one wins, we say so. Where the other wins, we say that too.

Dimension	Tally alone	Tally + custom ERP
Books of accounts, GST returns, statutory filings	Tally handles this completely. Best-in-class for Indian compliance.	Tally still handles all of this. No change.
Inventory across multiple warehouses	Tally tracks stock per godown but treats each warehouse as a container.	Custom ERP handles bin location, FIFO, batch tracking, real-time sync.
Quotations and PI workflows	Tally generates quotations. Approval flow, version tracking, sales person attribution missing.	Custom ERP handles the workflow. Quotation gets pushed to Tally as a final invoice on conversion.
PO and vendor management	Tally records POs. Multi-vendor comparison, RFQ broadcast, vendor scoring missing.	Custom ERP runs the RFQ to PO workflow. Tally receives the final PO.
Customer portal and self-service	Customers cannot log in to Tally. Statements emailed manually.	Custom ERP exposes a statement-of-account portal with payment gateway.
Sales rep mobile app	Tally is not designed for mobile field use.	Custom Android app for sales reps with offline-first order capture.
WhatsApp integration for operations	Tally does not push notifications. Manual chasing.	Custom ERP pushes order confirmations, dispatch alerts, payment reminders.
Founder dashboards on operational data	Tally reports are accounting-shaped. Cash position, P&L, balance sheet.	Custom ERP exposes pipeline, days-of-stock, top-5 outstanding, capacity.
GST returns, GSTR-1, GSTR-3B, 2B reconciliation	Tally is excellent here.	Custom ERP does not touch this. Tally stays the system of record.
Cost	Tally Prime subscription ₹2k to ₹15k per year.	Tally subscription stays. Custom ERP ₹5L to ₹15L build + hosting.

DimensionBooks of accounts, GST returns, statutory filings
Tally aloneTally handles this completely. Best-in-class for Indian compliance.
Tally + custom ERPTally still handles all of this. No change.
DimensionInventory across multiple warehouses
Tally aloneTally tracks stock per godown but treats each warehouse as a container.
Tally + custom ERPCustom ERP handles bin location, FIFO, batch tracking, real-time sync.
DimensionQuotations and PI workflows
Tally aloneTally generates quotations. Approval flow, version tracking, sales person attribution missing.
Tally + custom ERPCustom ERP handles the workflow. Quotation gets pushed to Tally as a final invoice on conversion.
DimensionPO and vendor management
Tally aloneTally records POs. Multi-vendor comparison, RFQ broadcast, vendor scoring missing.
Tally + custom ERPCustom ERP runs the RFQ to PO workflow. Tally receives the final PO.
DimensionCustomer portal and self-service
Tally aloneCustomers cannot log in to Tally. Statements emailed manually.
Tally + custom ERPCustom ERP exposes a statement-of-account portal with payment gateway.
DimensionSales rep mobile app
Tally aloneTally is not designed for mobile field use.
Tally + custom ERPCustom Android app for sales reps with offline-first order capture.
DimensionWhatsApp integration for operations
Tally aloneTally does not push notifications. Manual chasing.
Tally + custom ERPCustom ERP pushes order confirmations, dispatch alerts, payment reminders.
DimensionFounder dashboards on operational data
Tally aloneTally reports are accounting-shaped. Cash position, P&L, balance sheet.
Tally + custom ERPCustom ERP exposes pipeline, days-of-stock, top-5 outstanding, capacity.
DimensionGST returns, GSTR-1, GSTR-3B, 2B reconciliation
Tally aloneTally is excellent here.
Tally + custom ERPCustom ERP does not touch this. Tally stays the system of record.
DimensionCost
Tally aloneTally Prime subscription ₹2k to ₹15k per year.
Tally + custom ERPTally subscription stays. Custom ERP ₹5L to ₹15L build + hosting.

Comparison framed for founder-led Indian businesses, ₹5cr to ₹50cr.

When tally alone wins

Pick this when these are true.

+You are doing under ₹2cr in revenue with a single warehouse.
+Your operations are simple: receive, sell, file returns.
+You have under 5 users on Tally.
+Your sales team is the founder and one or two people.

When tally + custom erp wins

Pick this when these are true.

+You are above ₹5cr with multiple warehouses, multiple sales people, or both.
+Tally is fine for your books but you maintain Excel files alongside for everything operational.
+Quotation and order workflows have approval chains, version tracking, or attribution rules Tally cannot enforce.
+Customers ask for statements, documents, or self-service that you currently handle by email and WhatsApp.
+The sales team is on the road and needs offline-first mobile access to pricing, stock, and order entry.

The longer answer

Reasoning, in plain language.

Most ERP vendors selling to Indian SMBs frame the conversation as Tally versus their product. The framing is wrong. Tally is the financial system of record in India and there is no honest reason to replace it. Compliance is hard, GST returns are complex, the Tally ecosystem of CAs and auditors is irreplaceable, and the product is well-built for what it does.

What Tally was never built to do is run your operations. Multi-warehouse FIFO, batch tracking, customer-specific pricing tiers, scheme discount calculations, sales rep mobile apps, WhatsApp operational notifications, customer self-service portals, vendor RFQ broadcasts, founder operational dashboards. These are the operational layer, and Tally's data model does not extend that far.

The pattern we recommend, and the pattern that ES HAJI & CO. has run with us for years, is Tally for the books and a custom ERP for everything else. The two systems sync at the boundary. The custom ERP generates the operational documents (quotations, sales orders, dispatch advices). The final tax invoice gets pushed to Tally as a Tally voucher. GST returns continue to be filed from Tally. The custom ERP never touches statutory output.

This division of responsibility means the CA does not have to learn a new system. The auditors continue to audit Tally. The compliance ecosystem stays intact. Meanwhile, the operational layer gets the workflow, the dashboards, the mobile app, the customer portal, and the integrations that move the business forward.

The cost calculation is honest. You keep paying for Tally. You add a custom ERP build at ₹5L to ₹15L. Over five years the operational gains usually pay back within the first 12 to 18 months through faster collections, lower stockouts, and the founder time freed up from manual Excel exports. The accounting software versus ERP essay walks through the conceptual division. The decision infrastructure framing is what we mean by the operational layer.

Some modules in the custom ERP overlap with Tally features by surface area. Quotations, purchase orders, sales invoices, customer ledgers. The overlap is in the document type, not the role. Tally is your statutory engine. The custom ERP is your operational workflow. They cooperate; they do not compete.

We are not replacing Tally. We are doing what Tally was never built to do.

Engagement principle

From the work

Real engagement, not a sales scenario.

ES HAJI & CO. runs Tally for their books and a custom ERP from Simply Five Studio for their daily operations. RFQs, quotations, purchase orders, GRN, customer and vendor dashboards, and the operational reports the founder opens every morning. Tally still files every GST return. The pair has been live for over two years.

Read the ES HAJI & CO. case →

Engagement structure

Every comparison ends in the same decision. Either you have outgrown the off-the-shelf and need a fitted system, or you have not. The diagnostic answers it honestly.

Diagnostic · ₹1L–₹3L · 1–2 weeks

How we work →

Questions founders ask

FAQ.

Are you replacing Tally with the custom ERP?: No. Tally stays as the financial system of record. The custom ERP handles the operational layer that Tally was never designed for: multi-warehouse FIFO, batch tracking, sales workflows, customer portals, sales rep mobile apps, founder dashboards. The two systems sync at the document boundary.
How do Tally and the custom ERP exchange data?: We push final sales invoices from the custom ERP to Tally as Tally vouchers using the Tally ODBC connector or a custom XML integration. Master data such as customers, products, and tax ledgers can flow in either direction. The sync is bidirectional for masters and one-way for documents.
Will our CA still use Tally?: Yes. The CA continues to use Tally exactly as before. GSTR-1, GSTR-3B, and 2B reconciliation are filed from Tally. The custom ERP does not touch statutory output. This is deliberate. The compliance ecosystem in India runs on Tally and we do not disrupt it.
What about quotations that exist in both systems?: The custom ERP becomes the source of truth for quotations because that is where the operational workflow lives. Quotations are versioned, attributed to a sales person, run through an approval chain, and tracked to conversion. When a quotation converts to an order and then to a tax invoice, only the final invoice gets pushed to Tally.
What does a Tally + custom ERP setup cost?: Tally subscription stays at whatever you currently pay (₹2k to ₹15k a year for Tally Prime). The custom ERP build runs ₹5L to ₹15L depending on scope, plus hosting at ₹1500 to ₹15k a month. An optional Technology Partner retainer runs ₹50k to ₹1.5L a month for ongoing evolution and support.
Can we move off Tally later if we want to?: You can, but most clients do not. Tally remains the cleanest answer for Indian financial compliance even at ₹50cr+ revenue. The custom ERP we build is designed to coexist with Tally indefinitely. If you do eventually move off Tally, the custom ERP stays intact; we just rewire the document push.

Begin

The answer lives inside your operation.

Comparison pages help frame the choice. The choice itself is made against the workflows, the team, and the data you already have. That is what the diagnostic surfaces.

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