Custom ERP vs Tally: why the answer is usually both
Tally is the right home for your ledgers, GST returns and audit. This page shows where day-to-day operations outgrow it, and how a custom system can feed Tally instead of replacing it.
Keep Tally for accounts, GST and audit; it does that job well and your accountant already knows it. Build a custom ERP only for the operational work Tally does not follow, such as production stages, job work, approvals and field orders, and let it post finished vouchers into Tally. Replacing Tally outright is rarely worth the disruption.
Custom ERP
Best for: Manufacturers, job-work units and distributors whose purchase, production or dispatch involves stages and people an accounting package cannot follow.
- Screens and documents follow your own process, department by department
- Tracks work in progress: lots, job cards, machine stages and approvals
- Phone access for the owner, godown staff and field sales
- No per-user licence fees; you own the code and the data
- Posts sales, purchase and stock vouchers into Tally automatically
- Far higher upfront cost than any packaged software
- Weeks to build, and needs your team's time for discovery and testing
- Quality depends heavily on the developer you choose
- Needs a support arrangement for changes after launch
Cost: Typically starts around ₹85,000 for a first module; complete operations systems run ₹1,50,000–₹5,00,000, paid once.
Tally (TallyPrime)
Best for: Any Indian business that needs dependable accounts, GST returns, e-invoicing and straightforward stock in software its accountant already knows.
- Mature, fast and trusted for accounting and GST compliance
- Your accountant and auditor already work in it
- Handles godowns, batches, simple bills of material and job work vouchers
- Low, predictable cost next to any custom build
- Wide partner network for training and small TDL customisations
- Organised around vouchers and ledgers, not operational workflows
- Little visibility of work in progress, pending approvals or who is doing what
- Built for the accounts desk; staff outside the office need add-ons or remote access
- Heavy TDL customisation can need rework when Tally releases major updates
Cost: A one-time licence, single-user or multi-user, plus a yearly renewal for updates and connected GST services.
The short verdict
Keep Tally on its own if your business buys, stores and sells without much happening in between: a trader, a single-counter retailer, a service firm raising a few dozen invoices a month. Tally covers you, and a custom system would be money spent on comfort. Plenty of businesses reading this are in exactly that position.
Keep Tally and add a custom operations layer if the real work happens before the invoice: lots moving between job workers, machines to schedule, purchase requests waiting for approval, salesmen booking orders on the road. The custom system tracks that work and posts finished vouchers into Tally, so your accountant's routine does not change.
Replace Tally altogether only with a very good reason. If a vendor proposes it, ask what you would gain that a voucher export could not give you, and speak to your auditor before agreeing.
This question usually comes up when Tally starts to feel crowded. The accountant is entering things that are not really accounting, and the owner's questions cannot be answered from ledgers. The useful question is not which one to choose but which jobs belong in Tally and which do not.
Fit to your workflow: accounting versus operations
TallyPrime is organised around vouchers: a purchase, a sale, a receipt, a journal. Everything it knows arrives as a finished transaction, which is exactly right for GST, ledgers and the balance sheet. Operations work differently. Picture a knitwear job-work unit in Tiruppur: yarn goes to a knitter, fabric goes to a dyer and returns short, pieces go to tailors on piece rates, and a buyer wants to know where the order has reached. Tally can record material going out and coming back through its job work vouchers. It cannot tell the owner which lot is at which stage, who is running late, or what the shrinkage cost on each order. A custom ERP is built around exactly those stages.
Cost over five years: a renewal against a build
Tally's cost is small and predictable: a licence once, then a yearly renewal. Over five years it is among the cheapest serious software decisions a business makes. A custom ERP typically starts around ₹85,000 for one module, and complete systems fall between ₹1,50,000 and ₹5,00,000, paid once with no per-user fees. The honest comparison is not Tally against the ERP, because you keep paying for Tally either way. It is the ERP against what the operational gaps cost you today: a clerk retyping job cards, stock that vanishes between units, invoices raised late because dispatch never told accounts.
Ownership and lock-in: whose books, whose code
Your Tally data sits on your own computer or server, and any accountant you hire later can open it. The licence belongs to Tally, but the books stay portable in the way that matters. With a custom system the question is who holds the code. VS Tech Builders transfers the full source code, database and documentation on final payment, so another developer could maintain it if you ever needed one. Whoever you hire, put that handover in the contract before work begins.
Speed to start
Tally can be installed and running the same day, and your accountant needs no training. A complete custom ERP takes eight to sixteen weeks, although a phased build puts the first department, usually sales and dispatch or purchase, to work well before the last module is finished. If you need control this month, tidy your Tally masters first and plan the operations system alongside.
Integrations: making the two talk
This is where keeping both becomes practical. Tally can accept vouchers from other software, so a custom ERP can create sales, purchase and stock entries and send them across with the correct ledgers, GST rates and HSN codes. Keep the direction one way: operations push to accounts, never the reverse, so each kind of data has a single source. Ledgers and returns stay in Tally; stages, approvals and staff activity stay in the custom ERP. If billing at the counter is your only pain, read our comparison of custom billing software and Vyapar before commissioning anything larger.
Support after go-live
Tally support comes from a large network of partners across India, and many accountants solve everyday problems themselves. Custom software is supported by whoever built it, so the developer's stability matters as much as their skill. Ask for a written support plan before you sign; ours range from one month of launch support to three months of priority support, with an optional retainer after that.
Scaling: a second unit, more staff, more products
Tally copes comfortably as transaction volumes grow. It strains with people and places: twenty staff who each need a different screen, three units whose stock must be visible to each other as it moves, salesmen who need credit limits on their phones before taking an order. A custom system can be designed from day one for several units and many users, each seeing only their part. The garment exporters and manufacturing units pages show how that looks in two industries, and our article on why most ERP projects fail explains how to avoid the usual traps.
Frequently asked questions
Can a custom ERP post entries into Tally automatically?
Yes. Tally accepts vouchers from other software, so the ERP can send sales, purchase, receipt and stock entries with the right ledgers, GST rates and party details. A common pattern is a daily transfer after the accountant reviews a summary, though it can also be immediate. Each voucher carries the ERP document number, so any entry in Tally traces back to its order or dispatch.
Is TDL customisation of Tally a cheaper alternative to a custom ERP?
For modest needs, yes. A Tally partner can add fields to invoices, build extra reports or add simple approval steps using TDL, quickly and at low cost. It becomes strained when you need staff apps, multi-stage production tracking, dozens of users outside accounts, or screens that look nothing like a voucher. Try TDL first if your gaps are small and close to accounting.
Will our auditor accept figures that originate in a custom system?
Your auditor keeps working in Tally exactly as before, because that is where the books remain. What changes is upstream: invoices and stock entries are created from orders and dispatches in the ERP rather than typed in by hand, which usually means fewer errors to query. Share the voucher mapping with your auditor during the build so ledgers and GST treatment are agreed in advance.
We are a trading business. Do we need anything beyond Tally?
Probably not. Tally already handles purchases, sales, stock by godown, batches and GST for a trader. Look further only when a specific gap appears: salesmen who need to book orders and check stock from the road, dealers who want to order online, or several branches that must share stock as it moves. Even then, a focused app that feeds Tally is usually enough.
Related
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- ServiceAdmin Dashboard & Reporting Development
- GuideWhy Most ERP Projects Fail (And How to Avoid It)
- GuideBilling and Inventory Software for Small Business: Buy, Build, or Both?
- GuideHow to Choose Between Custom Software and Off-the-Shelf for Your Business in 2026
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