Understanding the combined incentive stack
How much you can really recover in year one
Many businesses recover 50% to 60% of total system cost in year one once a rebate, the ITC, and bonus depreciation are all stacked correctly. On a $240,000 system with a $10,000 rebate, 30% ITC, and 100% bonus depreciation at a 25% tax bracket, that's $127,875 recovered in year one, about 53.3% of the total cost. That's a meaningfully different number than what you'd get by applying each incentive to the original, un-adjusted cost. Check your exact ITC rate with the ITC calculator before running this stack, and the rebate plus ITC combined calculator in our rebates and incentives section for the same stacking math at a residential scale. Once you have a size in mind, the loan payment calculator in our Financing section can help you compare loan, lease, and cash purchase options for the system you just sized.
Why the order of operations matters
When your specific rebate is a basis-reducing one, it comes off your depreciable basis dollar for dollar, before the ITC is even calculated. The ITC then only reduces the remaining basis by half its value, not the full credit amount. Getting this order wrong is one of the most common mistakes in commercial solar tax planning, and it usually leads to overestimating your ITC amount since it's calculated on too high a starting cost. Confirming whether your rebate is actually basis-reducing or taxable income in the first place matters just as much as getting the sequence right. IRS Notice 2013-70 covers this point in more depth. Building type is a rough guide at best. The solar panel calculator in our System Sizing section can help you confirm the size from your actual electricity use.
The correct stacking sequence
Subtract the rebate from your system cost first, then calculate the ITC on that reduced amount, then reduce the depreciable basis by half the ITC value before applying bonus depreciation or standard MACRS. Each step feeds into the next, so a mistake early in the sequence compounds through the rest of the calculation. The financing cost with ITC applied tool covers a related sequencing question if part of your project is financed rather than paid in cash.
Not every rebate works the same way
The non-taxable treatment many people assume applies to utility rebates comes from IRC Section 136, but that provision is written for energy conservation measures at a dwelling, so it's squarely a residential rule. In a commercial context, a rebate from your utility usually has to be reported as taxable income rather than treated as a basis reduction, which flips the order-of-operations logic above. Confirm the tax treatment of your specific rebate program with a tax advisor before assuming it works the same way a homeowner's rebate would, and use the payback calculator to see how this net cost affects your overall payback timeline, alongside the ITC calculator for the federal credit piece. For the official rules on depreciation methods and recovery periods, IRS Publication 946 covers how MACRS applies to business property, including solar equipment, and IRS Notice 2013-70 spells out the rebate-versus-subsidy distinction that determines which treatment actually applies.