Guide to GST Refunds on Exports: With Payment vs. LUT Routes

India’s GST regime treats exports as "Zero-Rated Supplies." This means the government wants exporters to be globally competitive by ensuring that no domestic taxes are exported along with the goods or services.

To achieve this, the Goods and Services Tax (GST) system offers two distinct pathways for exporters to recover their taxes. Choosing the wrong pathway can lead to a liquidity crunch, where your money is trapped in the portal for months during a high-growth phase.

This guide provides a comprehensive comparison between the "With Payment of IGST" route and the "LUT" route to help you optimize your export cash flow in the 2026 Assessment Year.

Understanding the Two Export Routes

Section 16 of the IGST Act defines how you can execute zero-rated supplies:

Route 1: Export with Payment of IGST

In this route, you charge and pay 18% (or the relevant rate) IGST on your export invoice. You pay this tax using your existing Input Tax Credit (ITC) balance. If the ITC isn't enough, you pay the rest in cash.

• The Payoff: You then apply for a refund of this IGST.
• Best For: Businesses with surplus ITC who want to convert it into cash quickly.

Route 2: Export under Letter of Undertaking (LUT)

In this route, you do not pay any tax on the export invoice. You file a Letter of Undertaking (LUT) at the start of the year, which serves as a bond.

• The Payoff: Because you didn't pay any tax on the sale, your ITC keeps accumulating in your ledger. You then apply for a refund of this Accumulated ITC using a specific formula.
• Best For: Startups, service providers, and businesses with low margins who want to avoid any upfront tax payment.

Comparison Table: Which Route is Right for You?

How the Refund Process Works

For Goods (With Payment Route)

This is the "Gold Standard" for fast refunds. You do not need to file a separate refund form.

1. Mention the Shipping Bill number in your GSTR-1.
2. Pay the tax in your GSTR-3B.
3. The GST portal shares data with the Customs portal (ICEGATE).
4. ICEGATE automatically processes the refund and credits your bank account, often within 15–30 days.

For Services (Any Route) or Goods (LUT Route)

This requires a manual application via Form GST RFD-01.

1. You must file the refund application within 2 years from the "Relevant Date" (usually the date of shipment or receipt of foreign currency).
2. You must upload a Statement of Invoices and a Bank Realization Certificate (BRC) as proof of export.
3. The officer has 60 days to process the claim after you receive an acknowledgment.

Legal Reference

Relevant Law: Section 16 of the IGST Act, 2017 defines Zero-Rated Supplies. Section 54 of the CGST Act, 2017 governs the refund mechanism. Rule 89 of the CGST Rules, 2017 provides the formula for refunding accumulated ITC on LUT exports.

The Refund Formula for LUT Exports (Rule 89)

If you choose the LUT route, you don't get 100% of your ITC back. The government uses a proportionate formula:

Refund Amount = (Export Turnover / Total Turnover) × Net ITC

Example: If 50% of your sales are exports, you get back 50% of the ITC you paid on your raw materials and rent for that month.

Common Mistakes Beginners Make

1. Missing the BRC for Services: For goods, a shipping bill is proof of export. For services, an export is only "complete" when the foreign currency arrives in India. If you don't receive payment in an RBI-recognized bank within 1 year, your refund claim will be rejected and the LUT becomes invalid.
2. Data Mismatches in Shipping Bills: Changing the invoice number or value between the GST portal and the ICEGATE shipping bill. In the "With Payment" route, even a 1-rupee difference will block the automatic refund.
3. Attempting to Claim ITC on Capital Goods: Under the LUT route (Rule 89), you can only claim a refund of ITC on Inputs and Input Services. You cannot claim a refund of ITC paid on Capital Goods (Machinery/Computers). To recover tax on machinery, the "With Payment" route is usually better.

Conclusion

Maximizing your export profitability in 2026 requires more than just making sales; it requires a sophisticated tax-strategy. Manufacturers with heavy capital expenditure should lean towards the "With Payment" route to unlock their machinery ITC, while software exporters and freelancers should embrace the "LUT" route to preserve their day-to-day liquidity. Regularly reconciling your GSTR-2B against your bank receipts is the only way to ensure 100% tax recovery in a multi-country business model.