Installing a commercial Solar power system is not only an energy-cost decision. For eligible businesses that own and use a Solar power system for business purposes, depreciation under India’s income-tax framework can also influence the financial return from the investment.
One of the most discussed tax benefits is the 40% depreciation rate applicable to solar power generating systems under Appendix I of the Income-tax Rules, 2026.
This is commonly described in the Solar industry as accelerated depreciation because a significant portion of the asset’s depreciable value can be recognised relatively early through the tax depreciation mechanism.
However, accelerated depreciation is not a direct cash subsidy or a 40% tax rebate.
Instead, depreciation generally reduces the taxable income of an eligible business. The actual tax impact depends on the business’s taxable profits, applicable tax regime, asset ownership, commissioning and use, and other tax rules.
For factories, rice mills, cold storages, supermarkets, hotels, hospitals, poultry farms and other commercial establishments considering Solar, understanding this distinction is important.
Quick Answer: What Is the Solar Accelerated Depreciation Benefit?
Commercial businesses that purchase and own eligible Solar power-generating equipment for business use may be able to claim depreciation at the prescribed rate.
Under the current Income-tax Rules, 2026, solar power generating systems are listed under renewable energy devices with a 40% depreciation rate.
This does not mean a business gets 40% of the Solar system cost back as a tax refund.
For example, if an eligible Solar asset has a depreciable tax cost of Rs50 lakh, a 40% depreciation rate would correspond to Rs20 lakh of depreciation for a full-rate year, subject to the applicable tax rules and conditions.
If the business has taxable income, that depreciation can reduce the income on which tax is calculated.
The actual tax saving depends on the applicable tax rate and the business’s individual circumstances.
What Is Accelerated Depreciation for Solar?
Depreciation is a tax mechanism that recognises the cost of eligible business assets over time.
Solar panels, inverters, mounting structures and associated equipment may form part of the Solar power-generating system, depending on the asset classification and accounting/tax treatment.
Instead of treating the entire investment as an immediate business expense, depreciation allows the eligible cost to be recognised over the applicable period according to tax rules.
For Solar power generating systems, the current Appendix I specifies a 40% depreciation rate.
This is why commercial Solar is often discussed as an investment that can provide both:
- Electricity-cost savings
- Tax depreciation benefits
The two benefits are economically different but can contribute to the overall financial case for a Solar investment.
Is Solar Depreciation Still Available in India in 2026?
Yes, the current tax framework continues to provide depreciation for eligible business assets.
The Income-tax Act, 2025 provides for depreciation on tangible assets such as buildings, machinery and plant when they are owned and used for business or professional purposes, subject to the relevant provisions. Section 33 also provides specific rules for undertakings engaged in generation or generation and distribution of power.
The corresponding Income-tax Rules, 2026 prescribe depreciation rates, and Appendix I currently includes Solar power generating systems at 40%.
Therefore, businesses should not rely only on older articles that refer exclusively to the Income-tax Act, 1961. The current statutory framework should be checked when making a new Solar investment or preparing tax calculations.
How Does 40% Solar Depreciation Work?
Consider a simplified example.
Suppose a business purchases an eligible commercial Solar power system with a tax-recognised cost of:
Rs50 lakh
At a 40% depreciation rate:
Rs50 lakh × 40% = Rs20 lakh
So, subject to the applicable rules, ₹20 lakh would represent the depreciation amount for a full-rate year.
The remaining written-down value would be:
Rs50 lakh − Rs20 lakh = Rs30 lakh
Depreciation would then continue according to the applicable written-down-value mechanism and tax rules.
Important
Rs20 lakh is not the tax saving.
It is the depreciation deduction.
For example, if a hypothetical business’s effective marginal tax rate were 25%, the tax impact of a ₹20 lakh deduction could be approximately:
Rs20 lakh × 25% = Rs5 lakh
This is only an illustration.
Actual tax savings can differ because businesses may have different tax regimes, surcharges, cess, taxable profits, MAT-related considerations where applicable, brought-forward losses and other factors.
What Happens If the Solar System Is Installed Late in the Tax Year?
This is an important point for businesses planning their Solar project.
Under Section 33 of the Income-tax Act, 2025, the depreciation deduction is restricted to 50% of the prescribed rate when an asset is acquired during the tax year and is put to use for business or professional purposes for less than 180 days in that tax year.
Therefore, if the applicable depreciation rate is 40%, the depreciation considered under the half-rate rule would be:
40% ÷ 2 = 20%
This makes the commissioning and actual date of putting the Solar system into use important for tax planning.
Businesses should not assume that signing the purchase order or paying an advance automatically establishes the depreciation claim date.
The asset’s acquisition, installation and actual use should be documented appropriately.
Who Can Potentially Benefit From Commercial Solar Depreciation?
Solar depreciation is primarily relevant to businesses and other taxpayers that:
- Own the Solar asset
- Use the asset for eligible business or professional purposes
- Capitalise the Solar investment appropriately
- Meet the applicable depreciation conditions
- Have taxable business income against which the deduction can have an effect
Potential users may include:
Manufacturing Companies
Factories with significant daytime electricity consumption can combine Solar generation with depreciation benefits.
Rice Mills
Rice mills often operate substantial motors, conveyors, blowers, processing equipment and other electrical loads. Solar can potentially reduce daytime grid electricity consumption while depreciation can form part of the investment calculation.
Cold Storages
Cold-storage facilities have significant refrigeration loads. A properly designed Solar system can offset part of their daytime electricity consumption.
Supermarkets
Refrigeration, HVAC, lighting and other equipment can create substantial daytime electricity demand.
Hotels
Hotels may have loads from air conditioning, kitchens, pumps, lighting, laundry and water heating.
Hospitals
Hospitals have continuous and critical electricity requirements. Solar economics should be evaluated together with backup power requirements.
Poultry Farms
Poultry operations can have electricity demand from ventilation, lighting, water pumping and other equipment.
Commercial Buildings
Office buildings and other commercial properties may use rooftop Solar to offset daytime electricity consumption.
Is 40% Depreciation the Same as a 40% Tax Rebate?
No.
This is one of the most important points businesses should understand.
If a Solar system costs Rs50 lakh, a 40% depreciation rate does not mean:
“The government will refund Rs20 lakh.”
Instead, ₹20 lakh may represent the depreciation deduction for a full-rate year under the applicable rules.
That deduction reduces taxable income.
The resulting tax benefit depends on the tax rate applicable to the taxpayer.
Simple Illustration
| Particular | Amount |
|---|---|
| Eligible Solar asset cost | Rs50 lakh |
| Illustrative depreciation rate | 40% |
| Depreciation amount | Rs20 lakh |
| Example tax rate | 25% |
| Illustrative tax impact | Rs5 lakh |
This table is only an educational illustration and should not be treated as a tax computation for a specific business.
Does Solar Depreciation Reduce the Payback Period?
It can potentially improve the overall financial profile of a Solar investment.
A commercial Solar project’s financial evaluation may include:
- Solar system cost
- Electricity savings
- Operation and maintenance expenses
- Financing cost
- Applicable incentives or subsidies
- Tax depreciation
- Asset life
- Future electricity tariffs
- System degradation
- Replacement costs
- Business tax position
If depreciation reduces taxable income and creates a tax benefit for the business, the effective after-tax cost of the Solar investment may be lower than its initial capital cost.
However, depreciation should not be treated as an automatic reduction in the purchase price.
Accelerated Depreciation vs Solar Subsidy
These are two completely different concepts.
Solar Subsidy
A subsidy or government incentive generally reduces the eligible project cost or provides financial assistance under a specific scheme.
For example, residential Solar subsidy programmes have their own eligibility conditions and are different from commercial tax depreciation.
Depreciation
Depreciation is a tax deduction associated with an eligible business asset.
It affects taxable income rather than functioning as a direct Solar purchase subsidy.
Therefore:
Subsidy ≠ Depreciation
A commercial business should evaluate each benefit separately and verify whether a particular incentive is applicable to its project.
Can Businesses Claim Depreciation on Rooftop Solar?
Potentially, yes, when the rooftop Solar system qualifies as a business asset and the applicable tax conditions are satisfied.
A typical commercial rooftop Solar project may include:
- Solar PV modules
- Inverters
- Mounting structures
- DC/AC electrical equipment
- Protection equipment
- Monitoring systems
- Cables and associated components
The exact tax treatment and classification of individual components should be determined based on the applicable tax rules and the business’s accounting/tax position.
A qualified tax professional should review the capitalisation and depreciation treatment rather than assuming that every invoice item receives exactly the same treatment.
What About Ground-Mounted Commercial Solar?
The same principle can be relevant to eligible Solar power-generating assets used for business purposes.
Ground-mounted systems can be used by:
- Factories
- Large warehouses
- Industrial facilities
- Agricultural businesses
- Solar power projects
- Commercial campuses
The tax treatment depends on the ownership structure, business use, asset classification and applicable provisions.
A ground-mounted Solar project should therefore be evaluated as a complete investment rather than looking only at the module price.
What If the Business Takes a Solar Loan?
Financing does not automatically eliminate the potential relevance of depreciation.
For example, a business could finance a Solar installation through a term loan while capitalising the eligible Solar asset.
The financial analysis could then consider:
- Loan principal
- Interest expense
- Electricity savings
- Depreciation
- Tax impact
- Maintenance expenses
- Expected Solar generation
- Cash flow
However, the tax treatment of interest and other financing costs is separate from depreciation and should be evaluated under the applicable tax provisions.
What If the Business Uses a Solar PPA Instead of Buying the System?
This is an important distinction.
Under a typical CAPEX model, the business purchases and owns the Solar system.
Under a PPA/OPEX model, a third-party developer may own the Solar asset and sell electricity to the business under an agreement.
The entity that owns the asset is generally the key party for depreciation purposes.
Therefore, a business should not assume that it can claim depreciation on a Solar plant simply because it purchases electricity generated by that plant.
The contract structure should be reviewed carefully by the business’s tax and legal advisers.
Can Accelerated Depreciation Be Used With Commercial Solar Financing?
Potentially, yes.
Depreciation and financing address different parts of the investment.
A simplified commercial Solar model could look like this:
Solar investment
↓
Bank loan / internal capital
↓
Solar system installed and commissioned
↓
Electricity savings
Eligible tax depreciation
↓
Overall project economics
The business should model both cash flow and tax impact rather than looking only at the EMI or Solar installation cost.
What Documents Should a Business Maintain?
Good documentation is especially important for a commercial Solar tax claim.
Businesses should maintain records such as:
Purchase Invoice
The Solar system invoice should clearly identify the equipment and project cost.
Installation Records
Maintain documentation showing when the system was installed.
Commissioning Documentation
Keep commissioning and operational records.
Payment Records
Maintain bank/payment documentation supporting the investment.
Asset Register
The Solar system should be appropriately recorded in the business’s fixed-asset records.
Serial Numbers
Keep module and inverter serial-number records where relevant.
Agreement With EPC Contractor
Maintain the Solar EPC contract, scope of work and payment schedule.
Electricity and Metering Documents
For grid-connected systems, retain relevant electricity connection, meter and commissioning documentation.
Tax and Accounting Records
The depreciation calculation should be properly reflected in the relevant tax and accounting records.
Common Mistakes Businesses Make With Solar Depreciation
Mistake 1: Treating 40% as a Cash Rebate
A 40% depreciation rate is not the same as receiving 40% of the Solar investment from the government.
Mistake 2: Ignoring the 180-Day Rule
If an asset is put to use for less than 180 days in the tax year, the depreciation deduction can be restricted to 50% of the prescribed rate under Section 33.
Mistake 3: Assuming Every Solar Project Qualifies Automatically
Ownership, business use, asset classification and other conditions matter.
Mistake 4: Ignoring Taxable Profit
A depreciation deduction may have limited immediate cash-tax impact if the business does not have sufficient taxable business income.
Mistake 5: Using Outdated Tax Information
The Indian tax framework has transitioned to the Income-tax Act, 2025 and Income-tax Rules, 2026. Businesses should use current provisions rather than relying solely on older Solar articles.
Mistake 6: Ignoring Accounting Treatment
Tax depreciation and book depreciation are not necessarily identical.
Mistake 7: Looking Only at Solar Generation
A good commercial Solar investment analysis should consider both energy economics and tax implications.
How to Calculate the Financial Benefit of Commercial Solar
Businesses should evaluate Solar using an after-tax project model.
A simplified framework is:
Step 1: Calculate Project Cost
Include:
- Modules
- Inverter
- Mounting
- Electrical equipment
- Installation
- Engineering
- Other eligible project costs
Step 2: Estimate Annual Solar Generation
Use the project’s location, system capacity, orientation, shading, equipment specifications and expected performance.
Step 3: Estimate Electricity Savings
Consider the tariff and the percentage of Solar electricity that can actually be consumed or settled under the applicable arrangement.
Step 4: Calculate Operating Costs
Include:
- Preventive maintenance
- Cleaning
- Monitoring
- Insurance where applicable
- Inverter replacement assumptions
- Other maintenance costs
Step 5: Model Depreciation
Apply the applicable depreciation provisions to the eligible asset/block.
Step 6: Calculate the Tax Impact
The actual tax benefit depends on the taxpayer’s applicable tax rate and tax position.
Step 7: Calculate After-Tax Cash Flow
This provides a more useful picture of the Solar investment than simply calculating:
Solar cost ÷ annual electricity savings
Example: Commercial Solar Tax Benefit
Suppose a manufacturing business invests:
Rs1 crore in an eligible Solar power-generating system
For educational illustration only, assume the full 40% rate applies.
Year 1 depreciation
Rs1 crore × 40%
= Rs40 lakh
If the business’s hypothetical applicable tax rate were 25%, the indicative tax impact would be:
Rs40 lakh × 25%
= Rs10 lakh
Again, Rs10 lakh is an illustrative tax impact, not a guaranteed tax saving.
The actual calculation can be different depending on:
- Tax regime
- Taxable profit
- Surcharge
- Cess
- Other deductions
- Brought-forward losses
- Minimum tax provisions where applicable
- Asset classification
- Date of putting the asset to use
- Other tax rules
Businesses should therefore have their accountant or tax adviser calculate the actual benefit.
Commercial Solar + Depreciation: Who Should Consider It?
Accelerated depreciation can be particularly relevant when a business:
- Has significant taxable profits
- Consumes substantial daytime electricity
- Owns its Solar system
- Has suitable rooftop or ground space
- Can use a large portion of Solar generation
- Wants to reduce long-term electricity costs
- Is planning a long-term energy investment
For a profitable factory, for example, Solar can potentially provide an energy-saving benefit while depreciation can improve the project’s after-tax economics.
Commercial Solar in Andhra Pradesh
Businesses in Andhra Pradesh can evaluate Solar for a wide range of applications.
This can include:
- Manufacturing units
- Rice mills
- Cold storages
- Hotels
- Supermarkets
- Hospitals
- Poultry farms
- Warehouses
- Educational institutions
- Commercial buildings
For businesses in Tadepalligudem and West Godavari, the Solar feasibility assessment should consider the property’s roof area, electricity consumption, sanctioned load, daytime load profile, tariff structure, Solar potential and applicable DISCOM requirements.
The tax benefit should then be incorporated into the financial model.
Why Businesses Should Combine Solar Savings and Tax Planning
A commercial Solar project should not be evaluated only on its installation price.
A more complete calculation is:
Solar Investment
− Electricity Cost Savings
− Applicable Tax Impact
− Other Project Costs
= Overall Economic Benefit
This approach can help business owners compare Solar against other capital investments.
For example, a factory may compare:
- Solar installation
- New machinery
- Energy-efficiency equipment
- Battery storage
- Power-quality improvements
Tax depreciation can become one of several factors influencing that investment decision.
Is Accelerated Depreciation Available for Every Commercial Solar Buyer?
Not automatically.
Eligibility depends on the taxpayer, ownership, business use, asset classification and applicable tax provisions.
Therefore, businesses should avoid statements such as:
“Every Solar customer gets a 40% tax benefit.”
A more accurate statement is:
Eligible businesses that own and use qualifying Solar assets may claim depreciation at the prescribed rate, subject to the applicable income-tax provisions.
Important Tax Planning Considerations Before Installing Solar
Before signing a Solar EPC contract, a commercial business should discuss the following with its accountant or tax adviser:
- Who will own the Solar asset?
- How will the asset be capitalised?
- What is the applicable depreciation rate?
- When will the asset be considered put to use?
- Will the 180-day rule affect first-year depreciation?
- Does the business have sufficient taxable income?
- Which tax regime applies?
- Are there brought-forward losses?
- What financing costs are involved?
- Is the project CAPEX, lease, PPA or OPEX?
- How will GST and other taxes be treated?
- What records should be maintained?
These questions can help prevent tax assumptions from being built into the Solar ROI calculation incorrectly.
How VMJ Solar Solutions Can Help Businesses Evaluate Solar
For commercial customers in West Godavari and Tadepalligudem, VMJ Solar Solutions can help businesses assess the technical side of a Solar investment.
A proper commercial Solar assessment can consider:
- Electricity bills
- Connected and sanctioned load
- Daytime consumption
- Roof or ground availability
- Shadow conditions
- Solar system capacity
- Inverter selection
- Mounting requirements
- Expected generation
- Net-metering or applicable grid arrangements
- Expansion requirements
- Project economics
For tax depreciation, however, the final tax treatment should be confirmed with the business’s CA or qualified tax professional.
The strongest approach is to combine the Solar proposal with a professional financial and tax review before making the investment.
FAQs
1. What is accelerated depreciation for Solar in India?
Accelerated depreciation refers to the relatively high prescribed depreciation rate applicable to qualifying Solar assets. Under the current Income-tax Rules, 2026, Solar power generating systems are listed at a 40% depreciation rate.
2. Is 40% Solar depreciation the same as a 40% subsidy?
No. Depreciation is a tax deduction that can reduce taxable business income. It is not a direct 40% cash subsidy.
3. Can a company claim depreciation on rooftop Solar?
Potentially, if the company owns the qualifying Solar asset, uses it for eligible business purposes and satisfies the applicable tax requirements.
4. What happens if Solar is put to use for less than 180 days?
Under Section 33 of the Income-tax Act, 2025, depreciation can be restricted to 50% of the prescribed rate when an asset acquired during the tax year is put to use for less than 180 days.
5. Can a Solar loan and depreciation be used together?
Financing and depreciation are separate aspects of the investment. A business may finance a qualifying Solar asset and potentially claim applicable depreciation, subject to tax rules and ownership structure.
6. Can businesses using a PPA claim Solar depreciation?
Usually, the ownership of the Solar asset is critical. If a third party owns the Solar plant under a PPA/OPEX arrangement, the customer should not automatically assume it can claim depreciation on the plant.
7. Does Solar depreciation reduce the actual Solar system price?
No. The depreciation deduction can reduce taxable income and therefore potentially reduce the business’s tax liability. It does not directly reduce the invoice price.
8. Can a business with low or no taxable profit benefit immediately?
The immediate tax impact may be limited when there is insufficient taxable business income. The treatment of unabsorbed depreciation and its carry-forward should be reviewed under the applicable tax provisions.
9. Does depreciation apply to every item on a Solar invoice?
Not necessarily. The appropriate tax classification and capitalisation of individual components should be determined under the applicable tax and accounting rules.
10. Should a CA calculate the Solar depreciation benefit?
Yes. A commercial Solar project can involve significant capital expenditure, so businesses should have their CA or tax adviser verify the depreciation calculation and overall tax position.
Conclusion
Accelerated depreciation can be an important part of the financial case for commercial Solar in India.
Under the current Income-tax Rules, 2026, Solar power generating systems are listed at a 40% depreciation rate, subject to the applicable tax provisions.
However, businesses should remember that 40% depreciation does not mean 40% tax savings.
The actual benefit depends on the business’s taxable income, applicable tax rate, ownership structure, commissioning and use of the asset, and other tax considerations.
For a commercial Solar investment, the best approach is to evaluate three areas together:
Technical feasibility + Electricity savings + After-tax financial impact
Businesses in Tadepalligudem, West Godavari and across Andhra Pradesh can therefore look at Solar not simply as a way to generate renewable electricity, but as a long-term capital investment whose economics should be evaluated from both energy and tax perspectives.
Tax note: This article is for general educational purposes and is not tax or legal advice. Income-tax provisions, rules and interpretations can change. Businesses should confirm the applicable depreciation treatment with a qualified Chartered Accountant or tax professional before making investment or tax-filing decisions.