Zero Rated Supply Under GST: Exports, SEZ And The LUT Vs IGST Question

If you export goods or services, or supply to a unit inside an SEZ, you've probably heard your accountant mention "zero rated supply" at some point. It sounds simple enough — zero tax, right? But there's more to it than that one line suggests. There's a legal definition behind it, a genuine choice between two compliance routes, and a refund process that can either run smoothly or quietly drain your working capital for months if you get it wrong. Let's walk through it properly, the way it actually plays out in practice.

Before we get into the detail, here's the short version:

• Zero rated supply means 0% tax and you still keep your input tax credit — that's what actually separates it from "exempt."
• You have two routes available: LUT (export without paying IGST) or pay IGST and claim a refund afterward. Most exporters lean toward LUT.
• An LUT is valid for one financial year only, and you'll need to renew it before your first export invoice of the new year.
• Refund claims must be filed within 2 years of the relevant date. Miss that window, and the claim is gone for good — there's no second chance.

What "Zero Rated" Actually Means

Section 16 of the IGST Act, 2017 is where this concept comes from. A zero rated supply is taxed at 0% — but not because it's exempt. The law deliberately wants exports to leave Indian shores tax-free, since no country really wants to export its own tax burden along with its products. So exports of goods, exports of services, and anything supplied to an SEZ unit or developer all fall under this umbrella. And here's the part that actually matters for your bottom line: you still get to keep the input tax credit on everything that went into making that supply. That's the real difference between "zero rated" and "exempt" — and it's worth remembering, because the two get mixed up constantly.

Why This Should Matter to You, Not Just Your CA

This isn't just a box-ticking exercise for your accountant. It touches three things you genuinely care about:

• Pricing power: If your competitor in Vietnam or Bangladesh isn't paying domestic tax on their exports and you are, your quote becomes uncompetitive overnight, no matter how good your product is.
• Input tax credit: Money you've already paid on raw materials, packaging, freight, or even software subscriptions doesn't end up stranded as a sunk cost.
• Cash flow: The route you choose — more on that shortly — decides whether your money sits idle in a refund queue or stays free in your account, ready to pay salaries and suppliers.

Who Actually Qualifies

You don't need a dedicated export desk or a fancy compliance team to use this provision, and there's no turnover threshold either. If you fall into any of these, you're in:

• Any GST-registered business exporting goods outside India
• Any service provider billing a client abroad in convertible foreign exchange
• Any business supplying goods or services to a unit or developer inside a Special Economic Zone (SEZ)

A freelance designer working out of Indore, billing a client in Germany, qualifies just as much as a garment exporter in Tiruppur loading containers bound for Europe. Size really doesn't come into it.

The Four Faces of Zero Rated Supply

In practice, this concept shows up in four flavours:

• Export of goods — handicrafts shipped from Jaipur to a buyer in the US.
• Export of services — a Bengaluru SaaS company billing a US client in dollars, where the place of supply sits outside India.
• Supply to an SEZ unit — a Gujarat-based packaging company supplying cartons to a pharma unit inside the Surat SEZ.
• Supply to an SEZ developer — a contractor building infrastructure for the SEZ itself, even before any unit has actually moved in.

Zero Rated, Exempt, and Nil Rated Aren't the Same Animal

This is exactly where a lot of newly registered businesses trip up. All three terms sound like "no tax" on the surface, but the input tax credit treatment underneath is completely different — and that difference comes with real money attached:

Zero rated is the only one of the three where you charge nothing and still get your input tax back. That single distinction can make a real dent in your margins if you're not paying attention to it.

The Real Fork in the Road: LUT or Pay-and-Claim

Sooner or later, every exporter has to make this call. It helps to see both options laid out side by side:

Most exporters end up choosing LUT, and most advisors will point you there too — simply because it keeps your cash where it belongs: in your account, not sitting with the government while you wait.

Getting Your LUT in Place

Filing an LUT is entirely online — Form GST RFD-11, under Rule 96A of the CGST Rules — and for most businesses, it takes ten to fifteen minutes once you're logged into the GST portal. A few things worth knowing before you start:

• Eligibility: Almost every registered taxpayer qualifies. The only exception is anyone prosecuted for tax evasion exceeding ?2.5 crore, who'll need a bond with a bank guarantee instead.
• Details required: Two independent witnesses (name, address, occupation), along with self-declarations that you'll export within the prescribed time and pay IGST with interest if you don't.
• Sign-off: A Digital Signature Certificate, mandatory for companies and LLPs, or OTP-based EVC for everyone else.
• Validity: Just one financial year. It won't renew itself, no matter how long you've been filing it.
• The deadline everyone forgets: File before your first export invoice of the new financial year, ideally in the last week of March, so you're never caught exporting without cover, even for a single day.

How the Refund Actually Reaches Your Bank Account

Which refund process applies to you comes down to which route you picked:

• Exported under LUT: There's no automatic refund here — you claim back accumulated ITC by filing Form RFD-01 on the GST portal.
• Exported goods with IGST paid: The shipping bill itself doubles as your refund application, processed through customs. No separate RFD-01 needed.
• Exported services with IGST paid: You do need to file RFD-01, along with proof like the Foreign Inward Remittance Certificate (FIRC).

A handful of numbers are worth keeping in your head:

• 2 years from the relevant date to file your refund claim
• 60 days is the standard timeline for a refund order once the application is complete
• 90% provisional refund can often land within just 7 days, which genuinely helps ease the cash crunch
• A CA certificate is typically required for refunds above ?2 lakh, confirming the tax burden wasn't passed on to someone else

Honestly, most refund delays come down to one thing: paperwork that doesn't quite line up. Keep your shipping bills, invoices, BRC/FIRC, and GST returns matching each other, and you'll avoid the bulk of the trouble before it starts.

Mistakes That Quietly Cost Exporters Money

These show up again and again, year after year, even among exporters who've been doing this for a while:

• Letting the LUT quietly lapse at year-end and exporting anyway, as if nothing's changed. Every invoice raised after that point becomes taxable — plus 18% interest if the department catches it.
• Assuming SEZ supplies are zero rated just because the buyer happens to sit in the same state. Geography isn't actually the test here. What matters is whether the supply is for the SEZ unit's authorised operations, and whether the invoice carries the SEZ officer's endorsement. Miss either condition, and the zero-rated treatment — along with the refund — can be denied, even if the buyer is genuinely inside the SEZ.
• Confusing genuine export of services with so-called "intermediary" services, which are taxable, not zero rated. This distinction trips up even fairly experienced exporters.
• Missing shipping bill numbers, or invoice values that don't quite match between GSTR-1 and the refund statement.
• Incomplete BRC or FIRC documentation for service exports — probably the single most common reason refund applications get stuck in the first place.

Making GSTR-1 and GSTR-3B Tell the Same Story

Getting this reporting right matters more than most people assume:

Reconcile the two before you file either one — a mismatch is one of the quickest ways to land a deficiency notice, since the system cross-checks both returns automatically these days. One thing worth flagging: since July 2025, the figures in GSTR-3B Table 3.1 are auto-populated from GSTR-1 and locked. You can't simply edit them inside GSTR-3B anymore. If something's off, you'll need to fix it through Form GSTR-1A — an amendment facility for the same period — before you file GSTR-3B at all. Which really just means getting GSTR-1 right the first time matters more now than it used to.

Quick FAQ

Can I switch from paying IGST to filing an LUT partway through the year? Yes, absolutely. You can file an LUT any time — it just applies from that filing date forward, not retroactively to invoices you've already raised earlier that year.

Is filing an LUT compulsory? Not at all. You can always choose to pay IGST upfront and claim it back later instead — LUT is simply the cash-flow-friendly option that most exporters end up preferring.

What happens if my LUT expires and I don't catch it in time? Every invoice you raise after that point gets treated as a regular taxable supply — IGST plus interest — until you file a fresh LUT. It doesn't fix itself.

Does an LUT help with imports as well? No, it's strictly an export mechanism. You'll still pay IGST at customs on anything you import, though that amount becomes ITC, which you can later set off, or even claim back as a refund against your zero-rated exports.

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Zero rated supply is genuinely one of the more generous corners of India's GST law, built quite deliberately to keep Indian exporters competitive on the world stage. And the businesses that get the most out of it usually aren't the biggest ones. They're just the ones who treat LUT renewal, return reconciliation, and refund tracking as routine, ordinary habits — not something to scramble over once a year.