Most business owners evaluating rooftop solar focus on the electricity savings and the PM Surya Ghar subsidy. What they often overlook is the single largest financial incentive available to commercial solar buyers in India: the 40 percent accelerated depreciation allowed under Section 32 of the Income Tax Act for renewable energy assets. For a Rs 10 lakh solar installation, this provision alone can generate Rs 1.2 to Rs 1.8 lakh in tax savings in the very first year, before you factor in a single rupee of electricity cost reduction. If your business pays significant income tax, this benefit can reduce the effective cost of your solar system by 25 to 35 percent over the first five years. Here is a complete guide to how it works, who qualifies, and how to claim it correctly.
How Accelerated Depreciation Works
Under the Income Tax Act's Section 32, solar power plants are classified as "renewable energy plant and machinery" and qualify for a 40 percent depreciation rate using the Written Down Value (WDV) method. This is substantially higher than the 15 percent rate that applies to standard plant and machinery. The practical effect is that a large share of your capital investment is recognized as a business expense very quickly, reducing your taxable income and therefore your tax outgo.
Consider a concrete example. You purchase a Rs 10 lakh solar system for your factory in Kanpur. In Year 1, your depreciation deduction is Rs 4 lakh (40 percent of Rs 10 lakh). If your business pays corporate tax at 30 percent, that Rs 4 lakh deduction saves you Rs 1.2 lakh in tax. If you are an MSME paying at the 25 percent rate, the saving is Rs 1 lakh. Either way, that tax saving arrives in the same financial year you install the system.
The WDV method means depreciation continues on the remaining book value in subsequent years. In Year 2, your asset is valued at Rs 6 lakh (Rs 10 lakh minus the Rs 4 lakh depreciated). Forty percent of Rs 6 lakh is Rs 2.4 lakh, generating an additional Rs 72,000 in tax saving at the 30 percent rate. By Year 5, you will have expensed approximately Rs 8.6 lakh of your original Rs 10 lakh investment purely through depreciation, with the cumulative tax saving reaching Rs 2.5 to Rs 3 lakh depending on your tax rate.
Who Can Claim It
The 40 percent accelerated depreciation applies to all commercial and industrial solar installations in India. This includes offices, factories, shops, hotels, hospitals, cold storage facilities, rice mills, flour mills, and any other commercial premises. Businesses across Lucknow, Kanpur, Unnao, Raebareli, and the wider UP industrial belt are eligible.
There are three conditions the installation must meet. First, the solar plant must be owned by the business entity claiming the depreciation, not leased from a third party. Second, it must be installed on the business's own premises. Third, it must be used for the business's own operations. Residential properties do not qualify under this provision.
In terms of business structure, the provision applies broadly. Private limited companies, LLPs, partnership firms, and proprietorships are all eligible. The tax rate at which the depreciation benefit is realised will differ by entity type, but the 40 percent depreciation rate itself is the same across all commercial structures. Farmers whose solar installation is purely for agricultural operations generally do not qualify under this commercial depreciation provision, though separate agricultural income tax exemptions may apply.
Combining Accelerated Depreciation with GST Input Tax Credit
A GST-registered business gets a second major upfront benefit: Input Tax Credit on the GST paid at purchase. Solar equipment in India attracts 12 percent GST. On a Rs 15 lakh system, that is Rs 1.8 lakh in GST paid at purchase. As a registered business, you can claim this entire Rs 1.8 lakh back as Input Tax Credit (ITC) in your first monthly GST return after installation. This is not a deferred benefit - it reduces your GST liability within 30 to 60 days of installation.
Adding both benefits together for a Rs 15 lakh commercial installation in Year 1: Rs 1.8 lakh in GST ITC recovered almost immediately, plus Rs 1.8 lakh in depreciation-driven income tax savings (at 30 percent rate on Rs 6 lakh Year 1 depreciation). Total Year 1 financial recovery: Rs 3 to Rs 3.6 lakh on a Rs 15 lakh investment. Your effective net cost after Year 1, even before counting a single month of electricity savings, is Rs 11.4 to Rs 12 lakh. Add electricity savings of Rs 80,000 to Rs 1.5 lakh per month for a system this size and the financial case becomes extremely strong.
How to Claim It Correctly
Your chartered accountant files the depreciation in your annual Income Tax return. For companies, this is Form ITR-6. For proprietorships and partnership firms, it is ITR-3 or ITR-4. The critical step is ensuring your CA classifies the solar asset under "Renewable Energy Plant and Machinery" at the 40 percent WDV rate, not under the generic "Plant and Machinery" category which carries only a 15 percent rate.
This classification error is more common than it should be. Many CAs who handle general small business accounts are not familiar with the solar asset categorization and file it under the wrong category. The cost of this error is substantial: on a Rs 10 lakh system, the difference between 40 percent and 15 percent depreciation in Year 1 is Rs 2.5 lakh in taxable income, translating to Rs 62,500 to Rs 75,000 in excess tax paid in Year 1 alone. Over the system's life, the cumulative cost of incorrect classification can reach Rs 2 to Rs 4 lakh in additional avoidable taxes.
For documentation, retain: the original purchase invoice from your solar installer showing the full system cost and GST component, the MNRE empanelment certificate of the installer, the installation completion certificate, and the net metering approval letter from UPPCL if applicable. These documents may be required during any IT assessment or audit.
At Sunwize, we provide all documentation required for depreciation and GST ITC claims as part of the installation handover package. Every commercial customer receives a complete paperwork set so your CA has everything needed to file correctly from day one.
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