Solar Input Tax Credit: ITC Rules for Businesses in India

Solar input tax credit is the single biggest tax benefit most Indian businesses miss when they buy a solar plant. On a 100 kW commercial rooftop priced at ₹50 lakh before tax, the Goods and Services Tax (GST) outflow is roughly ₹6.9 lakh at the effective 13.8% blended rate. A GST-registered business recovers that entire amount as Input Tax Credit (ITC) against its output tax liability, which means the tax on the plant is, in practice, free. A business that structures the purchase badly, files late, or misses one documentation step can lose the whole ₹6.9 lakh.

Direct answer. Solar input tax credit is available to any GST-registered business in India that uses its solar plant for taxable business activity. Under Section 16 of the CGST Act, the full GST paid on panels, inverters, and EPC services, an effective ~13.8% on a bundled contract per the CBIC 70:30 rule, is creditable in GSTR-3B. Residential buyers and businesses selling only electricity cannot claim it.

This guide covers eligibility, the 70:30 works contract rule, capital goods treatment, the Section 17(5) blocked-credit question, the conflicting advance rulings your CA should know about, documentation, GSTR filing, and how ITC stacks with accelerated depreciation. It is written for business owners and the chartered accountants who advise them, and it builds on our parent guide to GST on solar.

What Is Solar Input Tax Credit and Who Can Claim It?

Solar input tax credit is the GST a registered business paid when buying its solar plant, claimed back as a credit against the GST it charges on its own sales. Section 16 of the Central Goods and Services Tax (CGST) Act, 2017 gives every registered person the right to take credit of input tax charged on goods and services used or intended to be used in the course or furtherance of business. A rooftop solar plant that cuts your factory’s electricity cost is squarely inside that definition.

Eligibility comes down to four conditions, all of which must hold at the same time:

1. You are registered under GST and file regular returns. Composition dealers and unregistered buyers are out.
2. The plant is used for taxable business activity. If your output is taxable goods or services, captive solar power qualifies. If your only output is electricity, which is an exempt supply, Section 17(2) blocks the credit.
3. You hold a valid tax invoice with the vendor’s GSTIN, correct HSN codes, and the tax amount shown separately.
4. The vendor has actually paid the tax to the government, which you verify indirectly when the invoice appears in your GSTR-2B.

The scale of the benefit is not trivial. Across our commercial projects in Gujarat, ITC typically returns 12% to 14% of the gross project value to the client within one or two filing cycles. Our glossary entry on GST input credit defines the mechanics; the short version is that ITC converts the GST line on your solar invoice from a cost into a temporary cash-flow timing item.

One clarification that trips up even experienced accountants: ITC is a GST concept, separate from income tax. It does not reduce your profit, and it does not appear in your profit and loss account as income. It sits in your electronic credit ledger and gets consumed against output GST each month. That separation matters when we get to the depreciation interaction later.

How Much GST Does a Business Actually Pay on a Solar Plant?

A business pays an effective ~13.8% GST on a bundled solar EPC contract in 2026, and every rupee of it is creditable if the eligibility conditions hold. The headline rates by component, consistent with our solar GST buyer guide and the component-wise GST rate guide:

Source: CBIC GST tariff and Circular 163/19/2021-GST, rates current as of 2026.

Run the arithmetic on a real project. A 100 kW rooftop at ₹50 lakh pre-GST attracts about ₹6.9 lakh in GST at the blended rate. The business claims ₹6.9 lakh as ITC in the month the invoice appears in GSTR-2B, and the credit offsets output GST over the following one to three months depending on the liability stream. Net GST cost: zero. Cash-flow cost: roughly one quarter of carrying the credit. That is why the CAPEX versus OPEX decision tilts so strongly toward ownership for GST-registered buyers; an OPEX or PPA model hands this credit to the developer instead of you.

The 70:30 Rule: Works Contract vs Pure Supply

The 70:30 rule is a valuation fiction created by CBIC Circular 163/19/2021-GST for solar EPC contracts. When goods and installation services are supplied together in one contract, 70% of the contract value is deemed to be goods (taxed at the solar device rate of 12%) and 30% is deemed to be services (taxed at 18%). The math: (0.70 × 12%) + (0.30 × 18%) = 13.8% effective rate on the whole contract.

Two structural choices change how this lands for the buyer:

• Bundled EPC contract (works contract route). One vendor, one contract, 70:30 applied, ~13.8% on everything. Simple, one invoice stream, full ITC on the blended amount. This is how most commercial rooftop projects are executed, including ours.
• Split procurement (supply route). You buy panels and inverters from equipment vendors at 12% and 18%, and hire an installer separately at 18%. Your blended rate is similar or slightly higher, but you manage multiple vendors, multiple warranties, and multiple invoice streams. Courts have confirmed that even separate invoicing does not defeat the 70:30 characterisation where the supply is genuinely a single works contract, which cuts both ways for buyers and vendors.

For the buyer, the practical takeaway is simple: the 70:30 blended rate is what a compliant vendor should charge on a turnkey contract, and the full amount is ITC-eligible. If a vendor quotes flat 18% on a bundled contract, you are overpaying tax even though you can claim it back, because you carry the extra credit for months. If a vendor quotes a suspiciously low rate, ask how, because an under-taxed invoice can be disallowed in your audit.

Get a free tax-efficient solar quote. Our proposals show the GST split, HSN codes, and expected ITC recovery month by month, so your CA can verify everything before you sign. Get your free quote →

Capital Goods Treatment: How Solar Sits in Your Books

A solar plant is a capital good under the CGST Act, and that classification drives three favourable rules. First, Section 2(19) defines capital goods as goods capitalised in the books of account, and a solar plant is capitalised as plant and machinery on your fixed asset register. Second, ITC on capital goods is available in full in the month the invoice is reflected in GSTR-2B. There is no spreading over the asset’s life, unlike the old CENVAT regime which released credit in two annual tranches. Third, if you sell or scrap the plant within five years, Rule 40(2) requires a proportionate payback of 5% per quarter or part thereof from the date of invoice. Hold the plant beyond five years and no payback applies on disposal.

The capitalisation treatment matters for a second reason: it anchors the plant and machinery argument that defeats the Section 17(5) blocked-credit rule, covered in the next section. Your fixed asset register entry, the vendor invoices, the commissioning certificate, and the net metering approval together form the documentary chain that proves the plant is a movable, business-used capital asset. Weak paperwork here is the number one reason ITC claims get challenged years later, and it is one reason buyers choosing industrial solar installation should treat documentation as part of the EPC scope, not an afterthought.

One more bookkeeping point your CA will raise: the GST you claim as ITC does not form part of the asset’s cost for income tax. Section 32 depreciation runs on the cost net of creditable GST. We show exactly how the two benefits stack in the dedicated section below.

Blocked Credits: Section 17(5) and the Plant and Machinery Question

Section 17(5) of the CGST Act blocks ITC on works contract services and goods used for the construction of immovable property, other than plant and machinery. The entire legal fight over solar ITC lives inside that italicised exception. If your solar plant is plant and machinery, ITC survives. If it is construction of immovable property, the credit is blocked.

The rulings so far split by fact pattern:

• Gujarat AAR, Unique Welding Products (2024). A factory rooftop plant for captive manufacturing use is plant and machinery, not immovable property, so ITC is allowed. Mercom India reported the ruling in January 2024, and CAs across the country cite it as the lead authority for captive rooftop claims.
• Rajasthan AAR, Pristine Industries (2022). A 620 kW rooftop plant capitalised as plant and machinery for captive use was held ITC-eligible on similar reasoning.
• Rajasthan AAAR, SBF Ispat (2025, reported 2026). For a 20.5 MW captive solar park, the appellate authority denied ITC on the ground that the output, electricity, is a nil-rated supply, pulling Section 17(2) into play. This is the ruling that has made large ground-mount captive projects nervous.
• Tamil Nadu AAAR, VBC Associates. ITC denied where the panels were used exclusively to generate and supply electricity, again on the exempt-output logic. The order sits in the GST Council’s published AAR database.

Read together, the pattern is consistent even though the outcomes differ. Rooftop plants bolted to your factory roof, feeding your own taxable manufacturing, are treated as plant and machinery with ITC intact. Projects whose commercial substance is generating and supplying electricity, including third-party sale or pure grid export, face denial under Section 17(2). Net metering sits in the grey middle: self-consumption clearly qualifies, while the exported units are where an aggressive assessing officer will push for proportionate reversal. Our sister firm’s DISCOM net metering process guide explains the export mechanics state by state, which is exactly what your CA needs to size any reversal.

How to Claim Solar ITC Step by Step

Claiming solar ITC is a six-step discipline that runs from contract signing to annual return. We teach clients a simple screen we call The Solar ITC 4-Gate Test: a claim survives audit only if it passes all four gates, Registration (you file GSTR-3B regularly), Taxable use (the plant serves taxable output, not exempt electricity supply), Structure (the plant is capitalised as plant and machinery, not civil construction), and Documentation (invoice, HSN, 2B match, payment proof). Fail any gate and the credit is at risk regardless of how the other three look.

With the gates in mind, the filing sequence:

1. Verify the vendor’s GSTIN on the GST portal before paying any advance. An unregistered installer cannot issue a valid tax invoice.
2. Get an itemised tax invoice showing HSN 8541 for panels, 8504 for inverters, and the 70:30 split or component-wise rates, with CGST and SGST (or IGST) shown separately.
3. Check GSTR-2B in the month after invoicing. ITC is claimable only when the invoice appears in your 2B, per the auto-population rules on gst.gov.in.
4. Claim in GSTR-3B Table 4(A), under capital goods, in the same tax period the 2B entry appears.
5. Pay the vendor within 180 days of the invoice date. Rule 37 forces reversal with interest if you do not, though you can re-claim once you pay.
6. Respect the Section 16(4) deadline. ITC for a financial year must be claimed by 30 November of the following year, or the date of filing the annual return, whichever is earlier. Miss it and the credit is permanently lost.

Two habits separate clean claims from litigated ones. Reconcile your purchase register against 2B every month rather than once a year, because a vendor who files late pushes your claim into the next period and closer to the deadline. And keep the commissioning report, CEIG approval, and net metering sanction with the invoice file, since those documents prove business use if the claim is questioned three years later.

When Solar ITC Is NOT Available

ITC is not a universal benefit, and knowing the exclusions before you sign the contract prevents nasty surprises in the first audit. The main denial scenarios:

1. 1
   Residential buyers under PM Suryaghar. Homeowners are not GST-registered and have no output tax, so the ₹15,000 to ₹35,000 of GST on a typical home system is a real, sunk cost. No registration, no credit, no exceptions.
2. 2
   Composition scheme dealers. Businesses under the composition scheme cannot claim any ITC, solar included, and cannot collect GST from customers either.
3. 3
   Exempt-output businesses. Schools, hospitals, and entities whose supplies are exempt must reverse proportionately under Rules 42 and 43. A hospital with taxable pharmacy sales claims ITC only on the taxable-use share.
4. 4
   Pure power producers. If the plant's output is electricity sold or exported, the SBF Ispat and VBC rulings support full denial under Section 17(2), because electricity carries no GST.
5. 5
   Personal or non-business use. A plant on a proprietor's residence, or a factory guest house, fails the business-use test in Section 16(1) outright.
6. 6
   Late or mismatched claims. Invoices missing from GSTR-2B, claimed after the 30 November deadline, or unpaid beyond 180 days all fail procedurally even when the substance is fine.

The residential exclusion deserves emphasis because it changes how subsidy math works for homeowners versus businesses. A homeowner bears GST as a true cost on top of the subsidised price, as our parent GST guide explains. A business owner looking at the same panel sees a recoverable deposit. Identical hardware, opposite tax outcomes, decided entirely by registration status and use.

ITC and Accelerated Depreciation: How the Two Benefits Stack

ITC and accelerated depreciation (AD) are the twin tax engines of commercial solar, and they stack cleanly because they sit in different statutes. ITC is GST law: you recover the tax paid on purchase. AD is income tax law: under Section 32 of the Income Tax Act, solar plant and machinery qualifies for written down value depreciation of up to 40% in year one for eligible businesses, as detailed in our guides to accelerated depreciation on solar and the AD mechanics for solar assets.

The interaction rule: when you claim ITC, the GST you recovered cannot also be depreciated. The depreciable cost is the project cost net of creditable GST. You do not lose anything; claiming the same rupee of tax twice is precisely what the law prevents.

That combined ~₹11.9 lakh on a ₹50 lakh project means the tax system alone funds nearly 24% of the plant in year one, before any electricity savings. Add generation savings of ₹9 to ₹12 lakh per year for a 100 kW plant at industrial tariffs, and the effective payback compresses to roughly 2.5 years. This stacking is why ownership beats rental for profitable, GST-registered businesses, and why the OPEX versus CAPEX comparison must always be run with tax benefits included. A PPA quote that looks cheaper per unit often quietly transfers both of these benefits to the developer.

Verdict. If your business is GST-registered, profitable, and consumes most of the solar output itself, claim both ITC and AD through a CAPEX purchase. Skip ITC only if you are composition-registered or your output is exempt; in those cases a RESCO model may be the better structure.

How Heaven Green Energy Helps

Heaven Green Energy has completed over 10,000 installations across 25+ cities, and our commercial and industrial projects are documented for tax compliance from day one. Every invoice we issue carries the vendor GSTIN, correct HSN codes per component, and the CGST/SGST split your CA needs for a clean GSTR-3B claim. For projects where the Section 17(5) or exempt-supply questions are live, we coordinate with your chartered accountant before contract signing so the plant structure, invoicing, and capitalisation entries all line up with the ITC position you intend to take.

• Commercial Solar, 10 to 100 kW systems with GST-split invoices built for ITC claims and AD planning.
• Industrial Solar EPC, 100 kW and above, turnkey delivery with commissioning and CEIG documentation that supports the plant and machinery position.
• Solar EPC, turnkey engineering, procurement, and construction under a single 70:30-compliant contract.
• Solar Calculator, model your savings, then bring the output to your CA to layer ITC and AD on top.

If you want a proposal that your auditor will approve of as much as your CFO, contact our team for a free site assessment and a tax-transparent quote.

Frequently Asked Questions

Can I claim ITC on a solar plant used for my factory?

Yes, in most cases. A GST-registered manufacturer using rooftop solar for captive consumption in taxable production can claim full ITC under Section 16 of the CGST Act. The Gujarat AAR in Unique Welding Products (2024) held such a plant to be plant and machinery, outside the Section 17(5) blocked-credit rule. Keep the itemised invoice, capitalise the plant, and claim in GSTR-3B once the invoice appears in GSTR-2B.

What is the 70:30 rule for solar GST?

CBIC Circular 163/19/2021-GST deems 70% of a bundled solar EPC contract value to be goods taxed at 12% and 30% to be services taxed at 18%, producing an effective rate of about 13.8% on the total contract. The rule applies when goods and installation are supplied together. The full GST charged under this structure is ITC-eligible for a registered business buyer.

Is solar ITC available to residential buyers?

No. Homeowners installing rooftop solar, including under PM Suryaghar, are not GST-registered and have no output tax liability to offset. The GST on a residential system, roughly ₹15,000 to ₹35,000 on typical 3 to 5 kW systems, is a real out-of-pocket cost. Only GST-registered businesses using the plant for taxable activity can claim the credit.

What happens if I do not pay my solar vendor within 180 days?

Rule 37 of the CGST Rules requires you to reverse the ITC claimed on that invoice, with interest from the date of availing the credit. The reversal is reported in GSTR-3B Table 4(B). Once you make the payment, you can re-claim the credit without a time limit. Stage payments linked to milestones are normal in solar EPC, so align your payment schedule with this 180-day clock.

Can a hospital or school claim ITC on solar?

Only partially, and often not at all. Healthcare and education services are largely exempt from GST, so Rules 42 and 43 require proportionate reversal of ITC attributable to exempt output. A hospital with taxable pharmacy or diagnostic income can claim credit on the taxable-use share of the solar plant. A fully exempt institution recovers nothing, and should evaluate RESCO or OPEX structures instead.

Does claiming ITC reduce my accelerated depreciation benefit?

Not in net terms. The GST you recover as ITC is excluded from the asset’s depreciable cost, so you depreciate the project cost net of creditable GST. You still get up to 40% year-one depreciation on that net cost under Section 32 of the Income Tax Act. The two benefits stack rather than compete: ITC returns the tax on purchase, and AD accelerates the deduction on the remaining cost.

What documents do I need to defend a solar ITC claim in an audit?

Keep six items together: the itemised tax invoice with HSN codes and vendor GSTIN, proof of payment within 180 days, the GSTR-2B entry matching the invoice, the fixed asset register entry capitalising the plant as plant and machinery, the commissioning certificate, and the net metering or CEIG approval. This chain proves business use, movable capital asset status, and procedural compliance, which are the three lines of attack in a Section 17(5) or 17(2) dispute.

Can I claim ITC on solar installed at my rented premises?

Yes, provided the plant is capitalised in your books as plant and machinery and used for your taxable business. Ownership of the building is not a condition in Section 16. What matters is that you own the asset, hold the invoice in your GSTIN, and use the power for taxable output. A landlord-tenant agreement clause allowing removal of the plant strengthens the movable-property position if the Section 17(5) question arises.