The CGST Act has no provision to refund or adjust GST because a customer never paid. Section 34 credit notes are allowed only for reasons such as excess value or tax, returned goods, or deficient supply, not for non-payment. On the buyer's side, section 16(2) requires input tax credit to be reversed if the supplier is not paid within 180 days of the invoice.
Every business that sells on credit eventually meets a customer who never pays. Under GST, that loss hurts twice: you lose the value of what you supplied, and you have already paid the GST on that invoice to the government.
This guide explains what the CGST Act does and does not allow when a debt goes bad, how the buyer's 180-day rule works, the accounting and income-tax side in general terms, and practical ways to reduce the risk.
Why is GST paid even if the customer never pays?
GST is a tax on supply, not on collection. Your liability arises at the time of supply, which for most sales is fixed by the invoice date or delivery, and is paid through your return for that period. Whether the customer pays later has no effect on that liability.
So when you issue an invoice for ₹1,00,000 plus 18% GST and file your return, you deposit ₹18,000 with the government, usually out of your own funds or your input tax credit, before the customer has paid anything.
Is there any GST relief for bad debts?
The CGST Act does not contain a provision that refunds or allows adjustment of output tax because a debt became irrecoverable. The main tool for reducing output tax, the credit note under section 34, is tied to specific situations:
| Situation | Credit note allowed under section 34? |
|---|---|
| Taxable value charged was more than payable | Yes |
| Tax charged was more than payable | Yes |
| Goods supplied are returned by the recipient | Yes |
| Goods or services found deficient | Yes |
| Customer simply does not pay | No |
| Customer becomes insolvent | Not a listed ground |
| Settlement for less than the invoice value after a dispute | Depends on facts; a genuine reduction in value agreed per terms may differ from a write-off. Take advice. |
For the full rules on credit notes, including time limits for declaring them, see credit note under GST.
When a credit note might legitimately apply
If the customer refused payment because goods were defective and returned them, or because a rate was wrongly charged, the real reason is a return or a deficiency, and a credit note may be correct. Document the reason carefully: inspection reports, return challans and correspondence. Issuing a credit note simply to "get back" GST on an unpaid invoice is likely to be challenged.
What is the buyer's 180-day rule?
The non-paying customer does not get to keep the benefit indefinitely. Under the second proviso to section 16(2) of the CGST Act, a recipient who has not paid the supplier the value of supply plus tax within 180 days from the invoice date must add an amount equal to the input tax credit availed to their output tax liability, with interest. When they later pay, they can take the credit again.
| Party | Effect of non-payment beyond 180 days |
|---|---|
| Supplier (you) | No change; output GST already paid stays paid |
| Recipient (customer) | Must reverse the ITC with interest until they pay |
This rule gives you a lever in negotiations: a business customer who claimed credit on your invoice faces a cost for not paying. Mentioning it politely in a firm reminder can help; see payment reminder templates. For more on credit conditions, see input tax credit rules.
Worked example: the real cost of a bad debt
A Ludhiana textile trader sells fabric to a retailer for ₹2,50,000 plus 5% GST in March 2026 on 30-day credit. The retailer never pays, and by October 2026 the trader decides the debt is irrecoverable.
| Item | Amount |
|---|---|
| Taxable value | ₹2,50,000 |
| GST at 5% | ₹12,500 |
| Invoice total (customer owes) | ₹2,62,500 |
| GST paid in March 2026 return | ₹12,500 |
| Cost of goods sold (assume 80% of value) | ₹2,00,000 |
| Cash actually lost | ₹2,12,500 (cost of goods + GST paid) |
The trader's books carry a debtor of ₹2,62,500. Writing it off removes ₹2,62,500 from debtors, of which ₹2,50,000 reverses the sale's profit effect through a bad-debt expense and ₹12,500 is GST that cannot be recovered. How the write-off is treated in your accounts and for income tax should be confirmed with your accountant.
How much extra must you sell to recover it?
If the trader's gross margin is 20%, each ₹1 of new sales earns ₹0.20. To recover a ₹2,12,500 cash loss, it needs roughly ₹2,12,500 ÷ 0.20 = ₹10,62,500 of additional sales. That is why preventing bad debts is worth far more effort than chasing them.
How are bad debts treated in accounts and income tax?
In general terms:
- In your accounts, an irrecoverable debt is written off as an expense, often after a provision has been built up for doubtful debts.
- For income tax, a deduction for bad debts actually written off is generally available to businesses subject to conditions in the Income-tax Act. From 1 April 2026 the Income-tax Act 2025 applies; check the relevant provision and conditions for your year with your tax professional.
- Recoveries later of debts that were written off are generally taxable when received.
Keep evidence that the debt is genuinely bad: reminders, legal notices, the customer's closure or insolvency, and your decision to write off.
How do you reduce the risk of bad debts?
- Check the customer before giving credit. Validate GSTIN and see that the registration is active using the GSTIN validator.
- Start with low credit limits and raise them only after a record of on-time payments.
- Take advances on large or custom orders. For goods, advances do not attract GST until the invoice (see advance payment under GST).
- Invoice immediately and chase on a schedule. The older a debt, the less likely it is to be paid.
- Stop supply at an overdue limit. Do not keep shipping to a customer who is already 60 days late.
- Use your MSME rights if eligible. According to the MSME Samadhaan portal, Udyam-registered micro and small enterprises can apply against buyers who delay beyond 45 days, with compound interest at three times the RBI bank rate. See the MSME 45-day payment rule.
- Review the ageing report monthly and act on anything over 60 days.
Billing Software by Betterwork tracks receivables by age and sends payment reminders automatically, which helps you spot a debt going bad while there is still time to act.
What is the step-by-step process when a debt looks bad?
- Confirm the balance with a customer statement listing invoices, payments and credit notes.
- Send a final notice with a deadline.
- Check the facts for a legitimate credit note (returns, deficiencies, wrong rate).
- Decide on legal or MSME remedies if the amount justifies it.
- Create a provision for doubtful debts at period-end if recovery is uncertain.
- Write off when recovery is no longer realistic, with documented reasons.
- Keep the GST position unchanged unless a section 34 ground genuinely applies.
- Record any later recovery against the written-off account.
How should you document a debt before writing it off?
Good records protect you in three ways: they support any income-tax deduction, they show auditors the write-off was justified, and they keep the door open for recovery later.
| Document | Why you need it |
|---|---|
| Original tax invoice and delivery proof | Shows the supply happened and when |
| Customer statement and confirmation requests | Shows the balance was communicated |
| Reminder emails, WhatsApp messages, call notes | Shows reasonable recovery efforts |
| Final notice or legal notice | Shows a formal demand was made |
| Evidence of customer closure, insolvency or disappearance | Shows recovery is unlikely |
| Internal approval of write-off | Shows who decided and why |
Store these together, by customer, for the period your accounting and tax records must be kept. See GST record keeping rules.
What if the customer is an unregistered buyer or a consumer?
The GST position is the same: tax on the supply has already been paid and is not refunded on non-payment. The 180-day ITC reversal does not help you here, because an unregistered buyer or consumer never claimed input tax credit. For B2C credit sales, which are less common, keep credit limits tight and favour advances, UPI at the time of sale, or cash on delivery.
Can you settle a disputed debt for less?
Sometimes accepting part of a disputed amount is better than chasing the whole. Before agreeing:
- Identify the real reason for the reduction, for example short supply, quality or a rate error.
- If it falls within a section 34 ground, issue a credit note with supporting documents.
- If it is simply a commercial concession to get paid, record it as a discount or loss in your books; it does not automatically entitle you to reduce output GST.
- Get the settlement in writing, stating that it closes the account.
Whatever the route, record the outcome in writing and keep it with the invoice file, so your books, GST records and income-tax treatment all tell the same story.
Common mistakes with bad debts and GST
- Issuing a credit note just to reverse GST on an unpaid invoice.
- Reversing output tax in GSTR-3B without a legal basis.
- Continuing to supply a customer who is far over their credit limit.
- Writing off without evidence of recovery efforts.
- Forgetting partial recoveries after a write-off.
- Not using the 180-day ITC rule as a talking point with business customers.
Key takeaways
- GST is paid on supply, so non-payment does not reduce your output tax.
- Section 34 credit notes cover excess value or tax, returns and deficiencies, not bad debts.
- Customers who do not pay within 180 days must reverse ITC with interest under section 16(2).
- A bad debt's real cost includes the GST you already paid.
- Prevention through advances, credit limits and prompt chasing is far cheaper than recovery.
This guide is general information, not tax advice. Rules last checked on 20 October 2026; confirm with your tax professional for your situation.