Taxes or Bond/LUT for Exports: Pick one?

Taxes or Bond/LUT for Exports: Pick One?

Indian exporters have two legally valid paths under Section 16(3) of the IGST Act, 2017: pay Integrated GST (IGST) on every export invoice and claim a refund later, or file a Letter of Undertaking (LUT) in Form GST RFD-11 and export without paying IGST at all. Both paths are zero-rated under GST export India 2026 rules, both preserve your Input Tax Credit (ITC) — but they produce dramatically different cash-flow profiles. For FY 2026-27, the right choice turns on your ITC accumulation pattern, domestic-sales mix, and what working capital actually costs your business.

What "Zero-Rated Supply" Actually Means Under Indian GST

Section 16(1) of the IGST Act defines a zero-rated supply as:

• Export of goods or services or both, or
• Supply of goods or services or both to a Special Economic Zone (SEZ) unit or SEZ developer.

Zero-rated is not the same as exempt. On an exempt supply you lose ITC. On a zero-rated supply you keep all your ITC — and you have a statutory right to either use that ITC against domestic output tax or claim it back as a refund. This distinction is what makes export supplies so valuable to structure correctly.

The two specific options are laid out in Section 16(3) of the IGST Act:

1. Option A — Export with payment of IGST and then claim refund of the IGST paid under Rule 96 of the CGST Rules, 2017 (auto-processed via shipping bill linkage with GSTR-1).
2. Option B — Export under Bond or LUT without payment of IGST and claim refund of unutilised ITC accumulated on inputs, under Rule 89 of the CGST Rules, 2017 via Form GST RFD-01.

Neither option is "free". Both have compliance triggers, timing dependencies, and cash-flow implications that need to be mapped against your specific business profile.

Bond vs LUT: Know the Difference Before You File

The terms "bond" and "LUT" are often used interchangeably in practice, but they are not the same instrument.

Letter of Undertaking (LUT) — Form GST RFD-11

An LUT is a self-declaration furnished on the GST portal. No bank guarantee, no physical stamp paper, no departmental approval — you file it online and receive an Acknowledgement Reference Number (ARN) immediately. It is valid for the entire financial year in which it is filed. For FY 2026-27 that means April 1, 2026 through March 31, 2027.

Who can file an LUT? Any GST-registered exporter who has not been prosecuted for tax evasion of Rs. 2.5 crore or more under the CGST Act, IGST Act, Customs Act, or any other law notified for this purpose. That threshold has not been revised since the original notification; most exporters comfortably qualify.

Bond — For the Remaining Cases

If you or your entity has been prosecuted under the above threshold, you must furnish a running bond instead of an LUT. The bond amount must cover the estimated IGST liability on your planned exports, and a bank guarantee equivalent to 15% of the bond value (as specified in Circular No. 8/8/2017-GST and subsequent clarifications) is required. Bonds are administratively heavier — they require jurisdictional officer approval and periodic renewal. In practice, fewer than 1% of exporters need to go this route.

For everyone else, LUT is the default and the correct starting point.

When the LUT Route Wins

The bond vs LUT GST debate usually ends here for most exporters. Under the LUT route, you issue export invoices with zero IGST, your cash never leaves your account, and you recover ITC on inputs by filing a refund claim.

The LUT route is clearly superior when:

• You are working-capital constrained. Paying 18% IGST on a Rs. 50-lakh export invoice means Rs. 9 lakhs tied up, potentially for 60–90 days while your refund processes. That has a real cost.
• You have clean, refundable ITC accumulation on inputs, input services, and (in some cases) capital goods that cannot be absorbed against domestic output tax.
• You are a pure-play exporter or a service exporter (IT, consulting, engineering services) with little or no domestic taxable revenue against which ITC could be set off naturally.
• You supply to SEZ units or SEZ developers. The LUT/bond requirement applies here too under Section 16(1)(b), and the operational flow is simpler without the IGST overlay.
• You are a merchant exporter procuring goods at a concessional GST rate (0.1% under Notification No. 41/2017-IT(R)) for onward export — the IGST-pay route involves more reconciliation complexity.

When the IGST-Pay Route Wins

Despite LUT gst exports being the dominant approach, there are real scenarios where paying IGST and claiming refund is the better call.

• You have heavy domestic taxable output that already absorbs most of your ITC. If Rs. 8 lakhs of monthly ITC is fully absorbed against Rs. 60 lakhs of domestic GST output, there is nothing left to refund under the LUT route. Paying IGST on exports then gives you a clean, auto-processed refund without a formal RFD-01 application.
• Your ITC is skewed to capital goods or blocked credits. Rule 89(4) of the CGST Rules calculates ITC refunds under the LUT route using a formula based on proportionate turnover, not a rupee-for-rupee repayment. If your actual input costs are low relative to your total turnover, the formula can give you less than your actual ITC. The IGST-pay route sidesteps this formula entirely — you get back exactly what you paid.
• You want operational simplicity. The IGST refund under Option A is largely automatic in 2026. GSTR-1 export invoices (Table 6A) are matched with shipping bill data on ICEGATE through the redesigned Customs-GSTN data bridge. Refunds are processed without a separate refund application in most cases. The LUT+RFD-01 path involves a formal 30-day provisional and 60-day final processing cycle with document scrutiny.
• Your exports are occasional or irregular. Filing and maintaining an LUT makes most sense when exports are a regular, budgetable revenue stream. If you export once or twice a year opportunistically, paying IGST and claiming the auto-refund is administratively lighter.

Worked Example: The Rs. Numbers That Make the Decision Obvious

Consider Navneet Precision Components Pvt. Ltd., a Pune-based manufacturer of precision-engineered parts. Monthly figures:

Under the IGST-pay route (Option A): IGST on exports at 18% = Rs. 60L × 18% = Rs. 10,80,000 paid monthly. Refund expected via shipping bill auto-route: Rs. 10,80,000 per month. Average processing time in FY 2026-27: 45 days. Working capital blocked per month: Rs. 10,80,000. Opportunity cost at 12% p.a. (cost of CC limit): Rs. 10,80,000 × 12% ÷ 12 × 1.5 months = Rs. 16,200 per month.

Under the LUT route (Option B): IGST paid: Rs. 0. ITC refund claimed monthly via RFD-01: Rs. 5,40,000 (ITC remaining after domestic absorption). Formula check under Rule 89(4): (Rs. 60L ÷ Rs. 80L total turnover) × Rs. 9L net ITC = Rs. 6,75,000. Since the formula yields more than the residual ITC available, the refund is capped at the actual residual = Rs. 5,40,000. Average processing time for RFD-01: 45–60 days. Working capital blocked per month: Rs. 5,40,000. Opportunity cost: Rs. 5,40,000 × 12% ÷ 12 × 1.75 months = Rs. 9,450 per month.

Net saving under LUT route: Rs. 16,200 − Rs. 9,450 = Rs. 6,750 per month, or Rs. 81,000 per year in pure financing cost — before accounting for the complexity difference.

For this profile, the LUT route wins, but only marginally. Now change one variable: if the domestic turnover rises to Rs. 60L monthly (matching exports), domestic output tax rises to Rs. 10,80,000, which absorbs the entire Rs. 9L ITC. Under the LUT route there is then nothing to refund via RFD-01 — and the company is left with no mechanism to recover ITC on export inputs except via the IGST-pay route. The scenario flips completely.

This is exactly why the decision must be modelled, not assumed.

Step-by-Step: Filing LUT on the GST Portal (Form GST RFD-11)

Filing an LUT for FY 2026-27 takes under 20 minutes if your DSC (Digital Signature Certificate) is active. Here is the precise sequence:

1. Log in to unknown node using your GSTIN credentials.
2. Go to Services → User Services → Furnish Letter of Undertaking (LUT).
3. Click "Apply LUT Online" (not the bond option).
4. Select Financial Year: 2026-27 from the dropdown.
5. Review the pre-filled GSTIN details. Confirm your IEC (Import Export Code) if applicable — DGFT-linked IEC should auto-populate for goods exporters.
6. Check all declaration checkboxes carefully. You are declaring: (a) goods or services will be exported within the prescribed time, (b) foreign exchange will be realised, and (c) if conditions are violated, IGST and interest will be paid.
7. Enter details of two independent witnesses: full name, present address, and occupation. These need not be professionals — any two individuals unconnected to the business will do.
8. Digitally sign using DSC (mandatory for companies, LLPs, and partnerships with DSC). Proprietors and individuals may use EVC (OTP-based).
9. Click Submit. An ARN (Acknowledgement Reference Number) is generated immediately.
10. Download and save the LUT acknowledgement. Attach a copy to the first export invoice of FY 2026-27.

Critical timing note: The LUT covers only the financial year for which it is filed. An LUT filed on April 15, 2026 leaves a 15-day gap in which any exports made without a valid FY 2026-27 LUT technically have no cover. File before April 1 each year. If you missed the window, the previous year's LUT does not extend — you must either file IGST on invoices raised in the gap period or immediately file the new LUT and treat the gap-period exports as covered retrospectively if the department allows it (seek written confirmation from your jurisdictional officer).

How the IGST Refund Actually Processes in 2026

For exporters who choose the IGST-pay route, the igst refund exporters mechanism works as follows under Rule 96 of the CGST Rules:

1. Raise export invoice with IGST charged at the applicable rate.
2. File GSTR-1 and report the invoice in Table 6A (zero-rated supplies — exports with payment of IGST). Include the shipping bill number and date.
3. GSTN transmits the Table 6A data to ICEGATE (the Customs portal) electronically.
4. ICEGATE validates the shipping bill against the GSTR-1 data. If the EGM (Export General Manifest) is filed and the data matches, a "Scroll" is generated.
5. Refund is auto-credited to your GSTIN's bank account (as registered on the GST portal) within 2 working days of Scroll generation in most cases.
6. No separate RFD-01 is needed. No manual intervention unless there is a mismatch.

Common mismatch reasons that stall auto-refunds:

• Invoice value on GSTR-1 differs from shipping bill value (even by Rs. 1 due to rounding)
• Shipping bill filed under a different GSTIN than the GSTR-1 invoice
• EGM not filed by the shipping line in time
• GSTR-3B not filed for the relevant tax period

For the ITC refund route (LUT path), the procedure goes through RFD-01 on the GST portal, with provisional sanction of 90% of claimed amount within 7 days for goods exporters (Circular No. 125/44/2019-GST, since updated) and full sanction within 60 days. Services exporters have a slightly different timeline under Rule 89(4) provisions for foreign currency realisation.

Common Mistakes That Cost Exporters Money

Mistake 1: Exporting before the LUT is filed

An LUT filed on April 5 does not retroactively cover a shipment on April 2. The April 2 invoice technically had no valid LUT cover, which means IGST should have been charged. Departments have levied show-cause notices for this gap. Fix: file LUT on or before March 31 every year.

Mistake 2: Not meeting the export time condition under the LUT route

For goods, the export must be completed within 3 months from the date of the tax invoice. For services, foreign exchange must be received within one year from the invoice date (or as extended by RBI/FEMA). If you miss these windows, IGST + interest at 18% per annum (as prescribed under Section 50 of the CGST Act, 2017) becomes payable from the date the return for the period was due. On a Rs. 60-lakh monthly export bill, three months of interest at 18% p.a. = Rs. 60L × 18% × 3/12 = Rs. 2,70,000 — for one missed shipment.

Mistake 3: Assuming LUT covers SEZ supplies automatically

An LUT filed for export of goods/services outside India also covers SEZ supplies, but you must explicitly declare "supplies to SEZ units/developers" in the LUT declaration. If the portal confirmation does not reflect SEZ coverage, you may need a separate clarification. Verify your ARN covers both categories.

Mistake 4: Using the ITC refund formula without checking if it actually gives you the full ITC

Rule 89(4) uses a proportionate formula. If your adjusted total turnover includes significant exempt supplies or non-business income, the denominator grows and the refund shrinks. Run the formula before committing to the LUT route for a high-ITC-accumulation quarter.

Mistake 5: Treating the IGST-pay route as "simpler" without accounting for GSTR-1 accuracy

The auto-IGST refund pipeline is only as good as your GSTR-1 Table 6A data. A single digit transposition in a shipping bill number blocks the entire Scroll. Build a reconciliation step between your export register, GSTR-1, and the ICEGATE data before every return filing.

Re-Evaluating Your Route Every March

Your input-output mix evolves. The LUT-vs-IGST-pay decision made in April 2025 may be the wrong one for April 2026. Build this five-step review into your year-end close:

1. Model 12 months of forecast exports and domestic taxable supplies for FY 2026-27.
2. Estimate ITC accumulation: total input GST likely to be available versus domestic output tax that can absorb it.
3. Calculate residual ITC — the amount that would need to be refunded via RFD-01 under the LUT route.
4. Estimate working capital cost under each route: (a) average refund processing time × monthly cash outgo under IGST-pay route × your cost of funds, versus (b) the same for ITC refund under LUT route.
5. Document the decision in a board resolution or partner resolution (for LLPs): "For FY 2026-27, the entity will export under [LUT / IGST-pay] route on the basis of the cash-flow analysis reviewed on [date]." This protects you in any future departmental inquiry about your filing posture.

The difference in annual working-capital cost between routes is rarely more than 0.5–1% of export turnover, but for a Rs. 5-crore annual exporter that is Rs. 2.5 to 5 lakh — real money that deserves 30 minutes of modelling.

Key Takeaways

• Section 16(3) of the IGST Act gives exporters a genuine choice — zero-rated via IGST-pay-and-refund, or zero-rated via LUT/Bond without payment. Both are legally valid for FY 2026-27.
• LUT (Form GST RFD-11) is the default for most exporters: file online on the GST portal before April 1, 2026 for FY 2026-27. No bank guarantee, no physical bond. An ARN is issued instantly.
• Bond is required only if your entity has been prosecuted for tax evasion of Rs. 2.5 crore or more — a rare situation affecting a tiny fraction of exporters.
• LUT wins when you are working-capital-tight, have steady ITC accumulation, and your domestic output tax cannot absorb that ITC efficiently.
• IGST-pay wins when domestic output tax fully absorbs ITC (leaving nothing to refund under RFD-01), or when the Rule 89(4) proportionate formula gives you less than your actual ITC cost.
• Missing the 3-month export window under the LUT route triggers IGST + 18% p.a. interest — build shipment-date discipline into your operations or you will pay more than you saved.
• Re-model the decision each March as your revenue mix changes; document the chosen route in board minutes; file the LUT before the new financial year begins.