Key points
- TRAN claims depended on clean closing balances in old returns.
- Credit on stock needed a reliable stock statement and supporting invoices.
- Clear cut-off dates decided which law and rate applied to each transaction.
- Weak records led to rejected claims and disputes years later.
- The same discipline makes rate changes like GST 2.0 easy to handle.
TRAN in one paragraph
When GST began on 1 July 2017, businesses used TRAN-1 to carry unused excise, service tax and VAT credits, and credit on stock in hand, into GST, and TRAN-2 for deemed credit on stock without duty-paid invoices. For the full story, see our TRAN-1 and TRAN-2 guide.
Five lessons from the TRAN experience
1. Closing balances must be right
TRAN-1 started from the closing credit shown in the last return under the old law. Businesses whose returns didn’t match their books had to explain the difference, sometimes years later. The lesson: reconcile your tax accounts with your returns every month, not once a year.
2. Stock records are tax records
Credit on stock held on 30 June 2017 needed a stock statement and invoices for that stock. Businesses that kept stock in a notebook couldn’t prove what they held. Today, the same is true when rates change: you need to know what you hold, at what cost and at what tax.
3. Cut-off dates decide everything
Was the supply before or after 1 July 2017? Was the invoice? The payment? These questions decided which law applied. The same “time of supply” logic decides which rate applies when GST rates change, as they did on 22 September 2025.
4. Documents must be kept for years
Transition claims are still being checked and argued years later. Old returns, stock statements and invoices are needed long after the event. Keep records in a system that stores them safely and shows an audit trail of every change.
5. Software readiness matters
Businesses that had to rebuild invoices and reports by hand in 2017 struggled. Those whose software was ready on day one moved on quickly. Good software lets you change a rate once and have every new bill follow.
Applying the lessons to rate changes today
| TRAN lesson | What to do when rates change |
|---|---|
| Clean closing balances | Reconcile input credit and output tax up to the change date. |
| Reliable stock records | Know the stock you hold and the tax paid on it on the change date. |
| Clear cut-off dates | Apply the time of supply rules to orders, advances and invoices that span the change. |
| Documents kept safely | Keep price lists, rate change notes and customer communications. |
| Software ready | Update item rates once; let the software apply them from the right date. |
A short checklist for the next tax change
- Read the notification Find which of your HSN codes are affected and from what date.
- Close the period cleanly Make sure all bills and purchases before the change are entered and reconciled.
- Take a stock snapshot Record stock on hand at the change date.
- Update item rates Change rates on items and price lists in your software.
- Handle open orders Decide the rate for advances and pending orders using the time of supply rules.
- Tell customers Explain price changes, especially when rates fall.
Read our GST 2.0 guide for how these steps applied to the September 2025 reform.
This guide explains GST rules in simple words and reflects the law as we understand it on 28 October 2026. Rules, rates and dates change, so please confirm with your CA or the official notifications before acting on it.