Solar Accelerated Depreciation in India: Tax Guide 2026

Key Takeaways

• The bottom line: solar accelerated depreciation (AD) in India is 40% in Year 1 and 40% in Year 2 under Section 32 of the Income Tax Act, with the remaining 20% over Years 3–25 — totaling 100% asset depreciation.
• For a typical 1 MW industrial CAPEX project at ₹3.5 Cr, the result is a Year 1 tax shield of approximately ₹40–55 lakh (depending on tax bracket) and a Year 2 shield of similar magnitude — combined ~₹85–110 lakh in 24 months.
• The main eligibility requirement: solar plants commissioned and put to use before September 30 of the financial year qualify for full 40% AD that year. Plants commissioned October 1 onwards get 20% AD (half-year rule) in the year of commissioning.
• The key consideration: MAT (Minimum Alternative Tax) under Section 115JB may limit AD benefit utilization for some buyers — recoverable as MAT credit over 15 years.
• GST input credit of 12% on solar equipment is reclaimable against output GST liability, effectively reducing project cost by ~10% for most industrial buyers.
• The result: combined federal tax incentives reduce effective post-tax CAPEX from ₹3.5 Cr to ~₹2.4–2.7 Cr per MW for typical industrial buyers — making industrial solar one of India's most attractive investments.
• Sun Wave Technologies, as a focused solar EPC company in India, structures every CAPEX project to maximize AD utilization, GST input credit, and Section 80-IA / 80-IB benefits where applicable.

What Is Solar Accelerated Depreciation in India?

In short, accelerated depreciation (AD) is a tax provision that allows industrial buyers to claim a higher depreciation rate on solar plants compared to standard depreciation, creating a Year 1 tax shield that materially improves project IRR.

The Legal Framework

Solar accelerated depreciation in India is governed by:

• Section 32 of the Income Tax Act, 1961 — depreciation provisions
• Income Tax Rules, Schedule II — depreciation rates by asset class
• Notification No. 103/2016 (and subsequent updates) — solar plant depreciation rate of 40% (down from 80% pre-2016)
• Section 32(1)(iia) — additional depreciation of 20% for plant and machinery acquired after March 31, 2005, used in manufacturing

The Numbers

The result of 40% diminishing balance: solar plants are effectively 80% depreciated by Year 2 close, and 90%+ depreciated by Year 3.

Solar Accelerated Depreciation Math: 1 MW Example

The bottom line: for a 1 MW industrial CAPEX solar project at ₹3.5 Cr, here's how AD plays out for a buyer in the 30% tax bracket:

Cumulative tax shield over 3 years for a 30%-bracket buyer: ~₹82 lakh on a ₹3.5 Cr project — a 23.4% cash-flow boost.

For the higher tax brackets (surcharge applicable), Year 1+2 tax shield can exceed ₹100 lakh on ₹3.5 Cr — making AD one of the largest single drivers of solar IRR.

Half-Year Rule: Why Commissioning Date Matters

In India, the half-year rule (Income Tax Rules) is critical for solar accelerated depreciation:

• Solar plants put to use for less than 180 days in the financial year get half the AD rate (20% instead of 40%)
• Solar plants put to use for 180+ days get full AD rate (40%)

The result: a plant commissioned September 30 vs October 1 has fundamentally different Year 1 tax math:

The bottom line: a 1-day difference in commissioning date can mean ₹21 lakh of Year 1 tax shield for a 1 MW project. Industrial buyers should coordinate with their solar EPC company in India to push for commissioning before September 30 if possible.

This is why most reputable solar EPC contractors in India target August-September commissioning for projects that started in Q1 — to maximize buyer's Year 1 AD utilization.

Section 80-IA: Additional 100% Tax Holiday for Solar IPPs

The main additional incentive: solar power generators (IPPs) qualify for Section 80-IA tax holiday — 100% deduction of profits for 10 consecutive years out of the first 15 years of operation.

Who Qualifies for Section 80-IA?

• Solar IPPs / power-generating companies registered with CERC / state ERCs
• The plant must be commissioned in eligible window (currently extended through March 31, 2025; extension uncertain post-2025)
• Profits must be from the eligible business (power generation only)

Industrial CAPEX Buyers and Section 80-IA

Pure industrial CAPEX buyers (factories self-consuming solar) typically don't qualify for Section 80-IA since they're not generating profits from "power generation business." However:

• A captive solar SPV (special purpose vehicle) can be structured as a power generation entity, sell power to the parent at PPA tariff, and claim Section 80-IA on the solar SPV's profits
• This structure adds complexity and is generally only worthwhile for 5+ MW captive projects
• Group captive structures (read group captive solar India guide) often combine 26% equity + Section 80-IA at the SPV level

RESCO/OPEX Developers and Section 80-IA

RESCO/OPEX developers are typically structured as power generators and claim Section 80-IA at the developer level. The result: this benefit is built into competitive PPA tariffs offered to industrial buyers, who indirectly benefit through lower tariffs.

MAT Implications (Minimum Alternative Tax)

The key consideration for solar AD: MAT (Minimum Alternative Tax) under Section 115JB may limit AD benefit utilization.

What Is MAT?

MAT requires companies with low taxable income (due to deductions like AD) to pay a minimum tax of 15% (plus surcharge and cess) on book profits. The result: even if AD reduces taxable income to zero, MAT ensures some tax is paid.

How MAT Affects Solar AD

For a profitable industrial company:

• If AD reduces taxable income below MAT threshold, the company pays MAT instead of regular tax
• The "lost" AD benefit converts to MAT credit, recoverable in future years (15-year carry-forward)
• The result: AD benefit isn't lost — just deferred. But IRR calculations should account for time value of money.

The bottom line: for highly profitable industrial buyers, MAT typically doesn't materially diminish AD benefits. For loss-making or marginally-profitable buyers, MAT credit accumulation may be the main mechanism by which solar AD benefits are realized.

Practical Tax Planning

A reputable solar EPC company in India typically coordinates with the buyer's CA / CFO on:

• Whether the buyer's projected taxable income justifies AD claim
• Structuring through a captive SPV vs direct ownership
• Whether MAT or regular tax governs in Year 1
• Long-term MAT credit utilization plan

Additional Depreciation: Section 32(1)(iia)

The main additional benefit for manufacturing buyers: Section 32(1)(iia) allows an extra 20% additional depreciation on plant and machinery acquired after March 31, 2005, used in manufacturing.

Eligibility

• Plant and machinery used in manufacturing or production of any article or thing
• Acquired and installed after March 31, 2005
• Solar plants generating captive power for manufacturing operations qualify per CBDT clarifications and case law

How It Stacks with AD

For a manufacturing industrial buyer:

The bottom line: Year 1 depreciation can reach 60% for manufacturing buyers stacking AD + Section 32(1)(iia). For a ₹3.5 Cr project, that's a Year 1 tax shield of ~₹63 lakh at 30% tax bracket — a 18% Year 1 cash-flow boost.

This is one of the strongest tax incentives in Indian capital expenditure planning, and should be a default conversation between buyers and their solar EPC contractor.

GST Input Credit on Solar

In short, GST input credit is the second-largest tax incentive after AD for industrial solar buyers.

How It Works

• Solar equipment (modules, inverters, structures, cables, etc.) is taxed at 12% GST under HSN codes 854140 (modules) and 8504 (inverters)
• Industrial buyers with regular output GST liability can claim this 12% as input credit
• The result: effective project cost reduced by ~10–11% (after accounting for non-GST line items like services and labor)

Eligibility

• Buyer must be GST-registered
• Buyer must have output GST liability (taxable supplies)
• Solar plant must be used for business purposes (taxable activities)
• Pure exempt-supply businesses (e.g., agriculture, healthcare) cannot claim GST input credit

How It Stacks with AD

For a typical industrial buyer at 30% tax bracket:

The bottom line: combined federal tax incentives reduce effective post-tax CAPEX from ₹3.50 Cr to ~₹2.33 Cr per MW for typical 30%-bracket industrial buyers — a 33% reduction.

RESCO/OPEX vs CAPEX: Tax Treatment Comparison

The key difference: tax incentives flow differently between commercial models.

CAPEX (Buyer Owns)

The buyer captures all federal tax incentives directly:

• 40% AD Year 1 (or 20% if half-year)
• 20% additional depreciation (manufacturing buyers)
• 12% GST input credit
• Section 80-IA only via captive SPV structure

RESCO/OPEX (Developer Owns)

The developer captures tax incentives, builds them into competitive PPA tariffs:

• AD captured by developer (typically structured as profitable solar power company)
• Section 80-IA at developer level
• GST input credit at developer level
• Buyer simply expenses PPA payments as operating cost — no asset on books, no depreciation
• The result: buyer avoids tax complexity but pays slight premium in PPA tariff

Open Access (Buyer Procures Power)

Similar to RESCO — buyer expenses power purchase as operating cost. No depreciation on a third-party asset. Read open access solar India guide.

Group Captive (26% Equity)

The hybrid: buyer holds 26% equity in solar SPV, captures proportional tax benefits at SPV level. Read group captive solar India guide.

When Solar Accelerated Depreciation Matters Most

The bottom line: AD matters most for buyers who can fully utilize it.

Best Fit for AD

• Highly profitable industrial buyers (taxable income > ₹3 Cr+) — full AD utilization
• 30% tax bracket buyers — maximum tax shield
• Manufacturing companies (eligible for additional 20% depreciation)
• Buyers with under ₹2 Cr CAPEX flexibility — AD shifts effective net cost meaningfully

Less Fit for AD

• Loss-making companies — AD piles up as carry-forward, deferred benefit
• MAT-affected companies — partial benefit, recoverable as MAT credit
• Tax-holiday companies (SEZ, EOU) — AD value diminished
• Companies with low income relative to project size — limited utilization

A reputable industrial solar provider in India should run AD utilization analysis for prospective buyers before recommending CAPEX vs RESCO.

Solar AD and the New Tax Regime

The result of the 2024 introduction of the new income tax regime:

• New regime (lower base rates, no deductions including AD)
• Old regime (with deductions including AD)

For solar AD-heavy investments, the old regime typically remains preferable for industrial buyers — the AD benefit ₹40-50 lakh in Year 1 typically exceeds the new regime's lower base rate savings.

The bottom line: most industrial buyers planning solar CAPEX should remain in the old tax regime to capture full AD value. Confirm with your CA before committing.

Tax Implications of Solar System Sale or Decommissioning

The key consideration if selling the plant before 25-year life:

• Sale value above WDV = Short-term or long-term capital gain (tax applicable)
• Sale value below WDV = Loss can offset other capital gains
• Plant scrapping at end-of-life = Loss = tax-deductible

The result: if the buyer plans to relocate or sell within 5–10 years, AD benefits already realized may be partially recaptured via capital gains tax on the sale.

Practical Tax Planning Steps for Industrial Solar Buyers

The bottom line: maximize tax benefits through these 8 steps.

Step 1: Engage CA Early

Bring your CA into the solar evaluation process from Day 1. They will assess MAT exposure, tax bracket, and old-vs-new regime fit.

Step 2: Structure Decision (CAPEX vs RESCO)

For highly profitable buyers: CAPEX captures AD directly. For loss-making or MAT-heavy buyers: RESCO/OPEX may deliver better post-tax economics via PPA tariff.

Step 3: Commission Before September 30

The result of half-year rule: plants commissioned before October 1 of FY get full 40% AD. Coordinate aggressively with your solar EPC company in India on commissioning timeline.

Step 4: Capture Section 32(1)(iia) for Manufacturing

Manufacturing buyers should explicitly claim Section 32(1)(iia) additional 20% depreciation. Verify with CA on eligibility under your specific manufacturing classification.

Step 5: Plan GST Input Credit Utilization

Coordinate GST input credit claim with your tax filing schedule. Most input credit can be utilized within 12 months.

Step 6: Document AD Eligibility

Maintain proof: equipment purchase invoices (with GST), commissioning certificate, PR test results, ALMM compliance documentation, structural certificates. Income tax authorities may require these during assessment.

Step 7: Consider Captive SPV Structure

For projects above 5 MW CAPEX, evaluate captive SPV structure to capture Section 80-IA + AD with cleaner accounting separation. This requires 26% equity threshold for group captive — read group captive solar India guide.

Step 8: Plan MAT Credit Utilization

If MAT is triggered in Year 1, accumulate MAT credit and plan utilization over the 15-year carry-forward window. Most buyers fully utilize MAT credit by Year 3-5 as taxable income recovers.

Sun Wave Technologies' Tax-Optimized Solar Solutions

Sun Wave Technologies, as a focused industrial solar provider in India, structures every CAPEX project to maximize tax benefits:

• Commissioning timeline targeted for August-September (capture full Year 1 AD)
• Detailed BOQ with GST line items for clean input credit claim
• Section 32(1)(iia) eligibility documentation for manufacturing buyers
• Coordination with buyer's CA on AD utilization and MAT analysis
• Captive SPV structuring for 5+ MW projects
• Group captive structure for multi-buyer setups
• Section 80-IA optimization at SPV level where applicable

For complete pillar context, see solar EPC company in India, solar provider in India, and commercial & industrial solar India.

Frequently Asked Questions

What is the solar accelerated depreciation rate in India in 2026?

The solar accelerated depreciation rate in India in 2026 is 40% in Year 1 (under Section 32 of Income Tax Act and CBDT Notification 103/2016) and 40% on the written down value in subsequent years. The result: solar plants are 80%+ depreciated within 24 months. Manufacturing buyers can additionally claim 20% additional depreciation under Section 32(1)(iia), bringing Year 1 total to 60%. The half-year rule applies — plants commissioned after October 1 get only 20% Year 1 AD.

How much tax do I save with solar accelerated depreciation?

The bottom line: for a 1 MW industrial CAPEX solar project at ₹3.5 Cr, a 30%-bracket buyer saves approximately ₹42 lakh in Year 1 + ₹25 lakh in Year 2 + ₹15 lakh in Year 3 = ₹82 lakh cumulative tax shield over 3 years. For manufacturing buyers stacking Section 32(1)(iia) additional depreciation, Year 1 tax shield rises to ~₹63 lakh, with cumulative 3-year shield of ~₹100 lakh. The result: combined with 12% GST input credit, effective post-tax CAPEX drops from ₹3.5 Cr to ~₹2.3–2.4 Cr per MW.

When should I commission my solar plant to maximize AD?

The key requirement: commission before September 30 of the financial year to qualify for full 40% Year 1 AD under the half-year rule. A plant commissioned October 1 or later gets only 20% Year 1 AD — half the tax shield. The bottom line: a 1-day commissioning delay (Sep 30 → Oct 1) can mean ₹21 lakh of lost Year 1 tax shield on a 1 MW project. Coordinate aggressively with your solar EPC company in India.

Does MAT (Minimum Alternative Tax) reduce my solar AD benefit?

The result: MAT may limit Year 1 utilization but doesn't eliminate AD benefit. If accelerated depreciation reduces your taxable income below the MAT threshold, you pay MAT (15% + surcharge + cess on book profits) instead of regular tax. The "lost" AD benefit converts to MAT credit, recoverable over 15 years against future regular tax. For most highly profitable buyers, MAT impact is marginal. For loss-making or marginally profitable buyers, plan AD utilization through MAT credit accumulation.

Can I claim GST input credit on solar equipment in India?

Yes. The bottom line: 12% GST on solar equipment (HSN 854140 modules, 8504 inverters) is reclaimable as input credit against output GST liability for GST-registered buyers with taxable supplies. The result: effective project cost drops by ~10–11% after GST input credit. Pure exempt-supply businesses (agriculture, healthcare) cannot claim. A reputable industrial solar provider in India provides BOQ with GST line items for clean input credit claim.

Is RESCO/OPEX better than CAPEX from a tax perspective?

The key consideration: tax benefits flow differently. CAPEX buyers capture all AD + GST input credit + Section 32(1)(iia) directly — best for highly profitable buyers. RESCO/OPEX developers capture tax benefits at the developer level and build them into competitive PPA tariffs — buyer simply expenses PPA payments. For loss-making or MAT-heavy buyers, RESCO often delivers better post-tax economics. The bottom line: run a side-by-side post-tax NPV analysis before deciding.

Does solar accelerated depreciation apply under the new tax regime?

The result: the new (2024) tax regime offers lower base rates but no deductions, including no AD. For solar AD-heavy investments, the old tax regime typically remains preferable because the AD tax shield (₹40-50 lakh Year 1 on a 1 MW project) typically exceeds the new regime's lower base rate savings. The bottom line: most industrial buyers planning solar CAPEX should remain in the old regime. Confirm with your CA before committing.

Can manufacturing companies claim additional depreciation on solar?

Yes. The main additional benefit for manufacturing buyers: Section 32(1)(iia) of the Income Tax Act allows 20% additional depreciation on plant and machinery acquired after March 31, 2005, used in manufacturing. Solar plants generating captive power for manufacturing operations qualify per CBDT clarifications. The result: Year 1 total depreciation can reach 60% (40% AD + 20% additional), delivering tax shield of ~₹63 lakh on a 1 MW ₹3.5 Cr project for 30%-bracket manufacturing buyers.

What is Section 80-IA and does it apply to my industrial solar project?

Section 80-IA grants 100% deduction of profits for 10 consecutive years out of the first 15 for solar power generators. Pure industrial CAPEX buyers (factories self-consuming solar) typically don't qualify since they're not generating profits from "power generation business." However, a captive SPV (Special Purpose Vehicle) structured as a power generator selling to the parent at PPA tariff can claim Section 80-IA — typically worthwhile for 5+ MW captive projects. RESCO/OPEX and Group Captive developers routinely capture this benefit.

How do I document my solar AD claim for tax authorities?

The key documentation: (1) Equipment purchase invoices with GST details, (2) commissioning certificate from EPC and DISCOM, (3) Performance Ratio (PR) test results, (4) ALMM compliance documentation for modules, (5) structural and electrical commissioning certificates, (6) PVsyst yield report and as-built documentation. A reputable solar EPC company in India provides all documentation as part of standard project handover. Income tax assessing officers may request these during AD claim assessment.

Sources & Related Reading

• Solar EPC Company in India — Pillar Guide
• Solar Provider in India — Pillar Guide
• Commercial & Industrial Solar India — Pillar Guide
• Solar EPC Cost per MW in India
• Solar Panel ROI Payback Period India
• Solar Savings Calculator for Factories
• Solar Financing Bank Loan India
• RESCO/OPEX Solar Model India
• Open Access Solar India
• Group Captive Solar India
• Solar PPA Agreement India
• PM Surya Ghar Yojana
• ALMM Mandate 2026

Sun Wave Technologies — Tax-optimized industrial solar solutions across India.