Free GST Export Refund Calculator India — LUT vs IGST
Indian exporters commonly think about GST refund through two broad routes: making zero-rated exports without payment of Integrated Tax under a valid Letter of Undertaking, or making exports on payment of Integrated Tax and seeking refund of the eligible IGST paid. The cash-flow effect can be very different, so a practical exporter needs more than a simple “18% GST” calculator. Our Free GST Export Refund Calculator India compares the two routes using the figures that actually matter for planning: export turnover, adjusted total turnover, eligible Net ITC, IGST rate and eligible IGST paid.
The LUT side of the calculator uses the familiar Rule 89(4) style planning formula for refund of unutilised input tax credit: relevant zero-rated turnover multiplied by eligible Net ITC, divided by adjusted total turnover. The IGST side estimates the export IGST paid from the entered value and rate, unless you enter an actual eligible IGST-paid amount. The purpose is to show the scale of the potential refund and the difference in cash-flow exposure, not to replace the GST portal's filing or an assessment by the tax authority.
What is GST refund on exports?
Exports are treated as zero-rated supplies under the GST framework when the legal conditions for zero-rating are satisfied. An exporter can generally structure the transaction through the LUT route without payment of IGST or through the IGST-paid route, with the corresponding refund mechanism. Current exporter guidance continues to describe these as the two principal routes and explains that the LUT route is associated with refund of eligible unutilised ITC, while the IGST-paid route is associated with refund of eligible IGST paid on exports.
That distinction is commercially important. With LUT, the exporter avoids paying output IGST upfront but may have accumulated eligible ITC that is claimed back through the refund process. With payment of IGST, the exporter funds the tax outflow first and seeks the eligible refund through the export-related refund mechanism. Which route is operationally preferable can depend on the exporter’s ITC position, working capital, system readiness and the exact nature of the transaction.
How the LUT refund calculation works
For the planning model used by this tool, the LUT refund is estimated using the structure: zero-rated turnover multiplied by eligible Net ITC divided by adjusted total turnover. Current GST refund guidance and Rule 89(4) based calculators use this formula for eligible zero-rated supplies made without payment of integrated tax.
For example, assume zero-rated turnover of ₹10,00,000, adjusted total turnover of ₹12,00,000 and eligible Net ITC of ₹1,20,000. The ratio is 83.33%, producing an indicative refund of ₹1,00,000 before any additional legal caps, adjustments or eligibility exclusions. The calculation is useful because it shows why refund does not automatically equal the entire ITC balance: turnover and the refund formula matter.
What is Net ITC for this calculation?
Net ITC is a critical input for the LUT route. The applicable refund rules define which credits are part of the calculation, and a careless “opening plus closing ITC” approach can overstate the amount. Current Rule 89(4) guidance used by exporter calculators focuses on eligible ITC on inputs and input services and excludes categories that do not form part of the defined Net ITC computation. Capital-goods ITC is a common example that needs separate treatment rather than being blindly added to the refund formula.
Use the Net ITC field only after reconciling the relevant period’s GST records. Our Free Landed Cost Calculator and other costing tools can help with commercial calculations, but GST refund eligibility should be grounded in the applicable return and credit records rather than a sales spreadsheet alone.
Why adjusted total turnover matters
The denominator in the LUT formula is not simply “total sales” copied from a management report. Adjusted total turnover is a defined refund concept, and exempt or other categories can affect the amount used in the formula. That is why the calculator asks for adjusted total turnover explicitly instead of silently assuming that export turnover equals the denominator.
If the adjusted total turnover is too low, the estimated refund can be overstated; if it is too high, the estimate can be understated. For serious refund preparation, reconcile the number to the relevant GST records and the rules applicable to the claim period.
1.5× cap on export goods turnover
The refund formula for eligible zero-rated goods has an important turnover-cap concept in Rule 89(4). The value of zero-rated supply of goods can be limited in relation to the value of like goods supplied domestically by the same or similarly placed supplier, subject to the applicable rule. Current refund references continue to describe a 1.5-times cap in the Rule 89(4)(C) calculation.
This tool therefore includes an optional 1.5× goods-turnover scenario. It is not automatically forced because the applicability and factual inputs should be verified for the particular refund claim. Entering a domestic comparable value can show the planning impact when the cap is relevant. Treat the result as a scenario, not as a legal determination.
Export under LUT: why businesses use it
One major advantage of the LUT route is working-capital management. When an eligible export is made without payment of IGST, the exporter does not have to fund the output IGST simply to wait for a later refund of that tax. Instead, the refund claim generally relates to eligible unutilised ITC according to the prescribed formula.
Current GST guidance describes LUT as Form RFD-11 and notes that the undertaking is used for eligible zero-rated supplies without payment of Integrated Tax. The LUT route is particularly relevant for regular exporters who accumulate eligible ITC on inputs and services and want to avoid repeated tax outflow on export invoices.
Export with payment of IGST
Under the IGST-paid route, the exporter charges and pays the applicable IGST on the export transaction and seeks refund of the eligible IGST paid. For goods, the export documentation and customs-data matching process becomes an important operational layer. Current exporter guidance describes the shipping-bill based mechanism and the importance of matching invoice and shipping-bill data for smoother processing.
The calculator therefore allows you to enter the actual eligible IGST paid. This is better than assuming that every export invoice automatically produces a refund equal to “sales × 18%”. The rate and taxability of the underlying supply must be established first, and the refund route has its own conditions.
LUT versus IGST: a simple cash-flow comparison
Imagine an export value of ₹10,00,000 and an 18% IGST scenario. The gross IGST amount would be ₹1,80,000 if the full value is taxed at 18%. Under the IGST-paid route, that amount can represent a temporary cash outflow before the refund process completes. Under a valid LUT route, the exporter does not pay that output IGST on the export invoice, but the exporter may instead claim a refund of eligible unutilised ITC subject to the Rule 89 formula.
The two amounts are not necessarily identical. One is output IGST paid on the export supply; the other is a formula-driven refund based on turnover and eligible ITC. This is why the comparison in this tool is valuable: it puts both scenarios side by side rather than calling the entire GST amount a “refund”.
Documents and reconciliation still matter
A refund calculator can produce a perfect mathematical result and still be useless if the underlying records do not reconcile. Exporters should align invoice numbers, export values, shipping-bill details, GST return figures, eligible ITC and bank-realisation evidence as required for the route and claim.
Current GST refund guidance repeatedly highlights reconciliation between GSTR-1, GSTR-3B, shipping-bill data and supporting evidence. The practical lesson is to use the calculator after the accounting and tax records have been cleaned up, rather than using a calculator output as a substitute for reconciliation.
Where the BRC or bank realisation fits
For export of services and certain refund workflows, evidence of foreign-exchange realisation can be relevant. That is why it is useful to connect the GST refund workflow with the Free BRC Rate Calculator India. That tool estimates the INR realisation economics, while this page focuses on GST refund planning.
Do not assume that entering a BRC amount into a calculator proves eligibility. The relevant date, type of supply, payment evidence and refund requirements depend on the transaction and applicable provisions.
What the calculator does not decide
This free calculator does not decide whether an export qualifies as a zero-rated supply, whether your LUT is valid, whether a particular ITC is eligible, whether a domestic-value cap applies, or whether an application will be sanctioned. It also does not prepare Form GST RFD-01 or submit a statement to the GST portal.
It is designed for planning, reconciliation and scenario analysis. For filing, use the current GST portal forms, your export records and professional advice where the tax position is complex or high value.
How to use the Free GST Export Refund Calculator
- Select goods, services, or goods plus services.
- Choose whether you are comparing the LUT and IGST-paid routes or focusing on one route.
- Enter zero-rated export turnover for the relevant refund period.
- Enter adjusted total turnover and eligible Net ITC for the LUT scenario.
- Enter the IGST rate and, where available, the actual eligible IGST paid.
- Use the optional 1.5× cap scenario for goods only when it is relevant and the domestic comparable value is verified.
- Use the readiness checks before relying on the planning result.
The right-side panel then shows the estimated refund, the LUT calculation, the IGST-paid scenario and the key formula inputs in one place. The comparison is deliberately transparent so an exporter can see which assumption is driving the result.
Build a complete exporter costing workflow
GST refund affects cash flow, but it should not be isolated from export pricing. Combine this calculator with the Free Export Profit Calculator to understand margin, the Free FOB/CFR/CIF Calculator for pricing terms, and the Free FTA Duty Savings Calculator India for destination-market tariff scenarios.
For shipment expenses, use the Free International Shipping Cost Calculator or Free Freight Quote Comparison Calculator. For import-side analysis, the Free Landed Cost Calculator and Free Customs Assessable Value Calculator India cover the other side of the transaction.
Best practice for GST refund planning
Use the calculator early enough to identify working-capital needs, but late enough that the tax-period figures are reasonably reconciled. Save the assumptions used for the calculation: export turnover, adjusted total turnover, eligible Net ITC, applicable IGST rate, actual IGST paid, and any cap or exclusion applied. When the return and refund filing is prepared, replace planning values with the final reconciled figures.
For recurring exporters, the biggest benefit is consistency. A standard monthly worksheet can use the same structure every period, making it easier to explain why the estimated refund changes when exports, domestic turnover or eligible ITC changes. This is much safer than treating the refund as a flat percentage of export sales.
Important GST refund disclaimer
This tool is an educational and planning calculator from Today Adviser. GST refund eligibility, calculation and filing can depend on the exact law, notifications, rules, circulars, transaction facts, return data, export documents and portal processes applicable to the claim period. Verify the result against the current GST/CBIC framework and the transaction records before filing or accounting for a refund receivable.
Free GST Export Refund Calculator FAQ
What does the Free GST Export Refund Calculator calculate?
It estimates the LUT-route refund using zero-rated turnover, adjusted total turnover and eligible Net ITC, and separately estimates an IGST-paid refund scenario using the entered IGST amount or rate.
What is the basic LUT refund formula?
For the planning model, estimated refund equals zero-rated turnover multiplied by eligible Net ITC, divided by adjusted total turnover, subject to applicable rules, exclusions and caps.
Does export under LUT mean no GST refund?
No. A valid LUT export can involve a refund of eligible unutilised ITC through the prescribed refund mechanism. The refund is not the same as output IGST paid on an export invoice.
Does export with IGST give an 18% refund?
Not automatically. The result depends on the applicable tax rate, taxable value, the IGST actually paid and the refund mechanism and conditions applicable to the transaction.
Why is adjusted total turnover required?
Because the LUT refund calculation uses a prescribed turnover denominator. It is not always the same as a business's simple gross-sales figure.
What is Net ITC in the LUT refund calculation?
For planning, use the eligible ITC on inputs and input services that forms part of the applicable refund computation. Do not simply add every credit balance without checking the applicable rules.
What is the 1.5× goods turnover cap?
Under the relevant Rule 89(4) goods-refund calculation, zero-rated goods turnover can be capped with reference to the value of like goods supplied domestically, subject to the applicable legal conditions. The calculator includes this as an optional scenario.
Can I use this for export services?
Yes, as a planning calculator. Service-export refund calculations can require additional attention to payment realisation, turnover definitions and export-of-service conditions, so final figures should be reconciled to the applicable records and rules.
Does this calculator file RFD-01?
No. It only calculates a planning estimate. Refund applications and supporting statements must be handled through the current GST process.
How should I choose between LUT and IGST-paid export?
Compare working-capital impact, eligible ITC, operational readiness and the refund route applicable to your transaction. Use the calculator as a scenario tool, then confirm the tax treatment and compliance process for the actual export.