The federal Investment Tax Credit gets most of the attention in commercial solar conversations, but MACRS depreciation is the powerful second incentive that makes commercial solar economics truly exceptional. While the ITC provides a direct 30 percent tax credit, MACRS allows businesses to deduct the remaining cost of their solar system over just five years — creating substantial additional tax savings that push the effective cost reduction to 50 percent or more.
At ProGreen Solar, we work closely with our commercial customers and their accountants to ensure they capture the full value of both incentives. This guide explains exactly how MACRS works for solar, walks through the calculations step by step, and shows you the combined impact on your total investment.
Important disclaimer: This guide provides educational information about MACRS depreciation for solar energy systems. Tax laws are complex and individual circumstances vary. Always consult with a qualified tax professional before making tax-related decisions.
What Is MACRS?
The Modified Accelerated Cost Recovery System is the tax depreciation method used for most business assets in the United States. It allows businesses to recover the cost of tangible property through annual deductions over a specified "recovery period" that is shorter than the asset's actual useful life.
For solar energy equipment, the IRS assigns a 5-year recovery period — meaning you can deduct the cost of your solar system over just five tax years, even though the system will produce energy for 25 to 35 years. This front-loaded deduction provides significant tax savings in the early years of the investment.
Who Qualifies
MACRS depreciation is available to:
- Businesses that own (not lease) the solar system
- The system must be used in a trade or business or for the production of income
- The business must have sufficient tax liability to benefit from the deductions
- The business must be the legal owner of the solar system (PPA and lease structures have the third-party owner capture depreciation)
Sole proprietors, partnerships, S-corporations, C-corporations, and LLCs all qualify, though the deductions flow through differently depending on entity structure.
The MACRS Calculation: Step by Step
Step 1: Determine the Depreciable Basis
The depreciable basis for a solar system is not simply the total installed cost. When you also claim the ITC, the depreciable basis must be reduced by half the ITC amount:
Depreciable basis = Total system cost - (ITC amount / 2)
For a $300,000 system with a 30 percent ITC ($90,000):
- Depreciable basis = $300,000 - ($90,000 / 2)
- Depreciable basis = $300,000 - $45,000
- Depreciable basis = $255,000
This basis reduction rule exists because the IRS does not allow you to both receive a tax credit for the full cost and depreciate the full cost — that would be double-counting. The compromise is that you reduce the depreciable basis by half the ITC.
Step 2: Apply Bonus Depreciation (If Available)
Bonus depreciation allows businesses to deduct a large percentage of the depreciable basis in the first year, rather than spreading it over all five years:
| Tax Year System Placed in Service | Bonus Depreciation Rate |
|---|---|
| 2022 | 100% |
| 2023 | 80% |
| 2024 | 60% |
| 2025 | 40% |
| 2026 | 20% |
| 2027+ | 0% (unless Congress extends) |
The bonus depreciation phase-down is significant. A system placed in service in 2026 qualifies for 20 percent bonus depreciation — still valuable but much less than the 100 percent available in 2022. Congress may extend or modify bonus depreciation, so check current legislation when making decisions.
For our $255,000 depreciable basis in 2026:
- Bonus depreciation (20%): $255,000 x 0.20 = $51,000 first-year deduction
- Remaining basis for standard MACRS: $255,000 - $51,000 = $204,000
Step 3: Apply the Standard MACRS 5-Year Schedule
The remaining basis after bonus depreciation is deducted using the standard 5-year MACRS percentages (200 percent declining balance, switching to straight-line):
| Year | MACRS Percentage | Deduction Amount |
|---|---|---|
| 1 | 20.00% | $40,800 |
| 2 | 32.00% | $65,280 |
| 3 | 19.20% | $39,168 |
| 4 | 11.52% | $23,501 |
| 5 | 11.52% | $23,501 |
| 6 | 5.76% | $11,750 |
| Total | 100% | $204,000 |
Note that the "5-year" schedule actually spans six tax years due to the half-year convention (the IRS assumes the asset is placed in service at the midpoint of the first year).
Step 4: Combine Bonus and Standard Depreciation
Total depreciation deductions for our $300,000 system with 2026 placement:
| Year | Bonus Depreciation | Standard MACRS | Total Deduction |
|---|---|---|---|
| 1 | $51,000 | $40,800 | $91,800 |
| 2 | — | $65,280 | $65,280 |
| 3 | — | $39,168 | $39,168 |
| 4 | — | $23,501 | $23,501 |
| 5 | — | $23,501 | $23,501 |
| 6 | — | $11,750 | $11,750 |
| Total | $51,000 | $204,000 | $255,000 |
Step 5: Calculate Tax Savings
The actual tax savings depend on your marginal tax rate. Depreciation deductions reduce taxable income, so the tax savings equal the deduction multiplied by the tax rate:
| Tax Rate | Year 1 Tax Savings | Total Tax Savings (6 years) |
|---|---|---|
| 21% (C-corp federal) | $19,278 | $53,550 |
| 24% (individual bracket) | $22,032 | $61,200 |
| 32% (individual bracket) | $29,376 | $81,600 |
| 37% (individual bracket) | $33,966 | $94,350 |
When you add Colorado state income tax (4.4 percent flat rate), the combined savings increase by approximately 15 to 20 percent.
The Complete Picture: ITC + MACRS
Here is the combined tax benefit for our $300,000 commercial solar system at the 24 percent marginal federal rate:
| Benefit | Amount |
|---|---|
| Total system cost | $300,000 |
| Federal ITC (30%) | -$90,000 |
| MACRS federal tax savings (24% x $255,000) | -$61,200 |
| Colorado state tax savings (4.4% x $255,000) | -$11,220 |
| Total tax benefits | -$162,420 |
| Net system cost | $137,580 |
| Effective cost reduction | 54% |
The ITC alone reduces costs by 30 percent. Adding MACRS brings the effective reduction to 54 percent. For businesses in higher tax brackets, the reduction can reach 60 percent or more.
Comparing Different System Costs and Tax Brackets
| System Cost | ITC (30%) | MACRS Savings (24%) | Total Benefit | Net Cost | Effective Discount |
|---|---|---|---|---|---|
| $100,000 | $30,000 | $20,400 | $50,400 | $49,600 | 50.4% |
| $200,000 | $60,000 | $40,800 | $100,800 | $99,200 | 50.4% |
| $500,000 | $150,000 | $102,000 | $252,000 | $248,000 | 50.4% |
| $1,000,000 | $300,000 | $204,000 | $504,000 | $496,000 | 50.4% |
At the 32 percent bracket, the effective discount rises to approximately 57 percent. At the 37 percent bracket, it exceeds 60 percent.
Special Situations and Nuances
Businesses with Insufficient Tax Liability
If your business does not have enough tax liability to use the full ITC or depreciation deductions in the first year, several options exist:
ITC carryforward: The unused ITC can be carried forward for up to 22 years and carried back for 3 years. It will eventually be used as long as the business generates taxable income.
ITC transferability: Under the Inflation Reduction Act, businesses can sell their ITC to another taxpayer — receiving cash in exchange for the tax credit. This is particularly useful for early-stage businesses or those with tax losses.
Depreciation carryforward: Unused depreciation deductions can be carried forward indefinitely. Additionally, Section 199A deductions and other provisions may affect the optimal timing of depreciation claims.
Entity restructuring: Some businesses restructure ownership to partner with tax equity investors who can efficiently use the tax benefits. This is common for larger systems.
Nonprofits and Government Entities
Nonprofits, schools, churches, and government entities cannot use the ITC or MACRS directly because they do not pay federal income tax. However, they can still access these benefits through:
- Power Purchase Agreements (PPAs): A for-profit third party owns the system, captures the tax benefits, and sells electricity to the nonprofit at a reduced rate
- Direct pay elections: The IRA allows certain tax-exempt entities to receive the ITC as a direct payment (essentially a refund) rather than a tax credit
- USDA REAP grants: Rural businesses and agricultural operations can receive grants covering up to 50 percent of system cost
Battery Storage
Battery storage systems paired with solar also qualify for both the ITC and MACRS depreciation on the same terms as the solar panels. This makes adding batteries to a commercial solar installation even more financially attractive. See our guide on solar battery economics for the financial analysis.
Prevailing Wage and Apprenticeship Requirements
For systems 1 MW and above (AC capacity), the full 30 percent ITC rate requires meeting prevailing wage requirements during construction and for the first five years of maintenance, plus using registered apprentices for a specified percentage of labor hours.
Systems under 1 MW are exempt from these requirements and automatically qualify for the 30 percent rate. Most commercial rooftop systems fall under this threshold.
Accounting Treatment
Cash vs. Accrual Accounting
MACRS depreciation applies to both cash-basis and accrual-basis taxpayers. The deductions are available in the tax year the system is placed in service, regardless of when payment occurs.
Book vs. Tax Depreciation
For financial reporting (GAAP), the solar system is typically depreciated on a straight-line basis over its useful life (25 to 30 years). The difference between tax depreciation (5-year MACRS) and book depreciation (25 to 30 year straight-line) creates a temporary difference that appears as a deferred tax liability on the balance sheet.
This is a normal and expected accounting treatment. The accelerated tax depreciation provides real cash flow benefits even though book income is not affected.
State Tax Treatment
Most states, including Colorado, conform to federal MACRS depreciation rules. Colorado's 4.4 percent flat income tax applies to the same depreciation deductions, providing additional tax savings equal to 4.4 percent of each year's depreciation deduction.
Some states have their own depreciation rules or additions/subtractions from federal taxable income. Check with your state tax advisor.
Working with Your Tax Professional
We strongly recommend involving your tax professional early in the commercial solar evaluation process. They can:
- Confirm your tax bracket and the effective tax savings rate
- Assess tax liability sufficiency to absorb the ITC and depreciation
- Advise on entity structure for optimal tax benefit capture
- Plan the timing of system placement in service relative to your tax year
- Coordinate with other tax planning strategies
- Prepare the required tax forms including IRS Form 3468 (ITC) and Form 4562 (Depreciation)
ProGreen Solar provides detailed financial models and documentation that your tax professional needs to accurately reflect the solar investment in your tax returns.
Why the Window Matters
Bonus depreciation is phasing down. In 2026, the bonus depreciation rate is 20 percent, down from 100 percent in 2022. Without congressional action, bonus depreciation drops to zero after 2026.
While the standard 5-year MACRS schedule still provides substantial tax benefits even without bonus depreciation, the front-loading of deductions into year one is valuable because of the time value of money. A dollar of tax savings today is worth more than a dollar of savings spread over six years.
The 30 percent ITC is stable through 2032 under the Inflation Reduction Act, so that incentive is not at risk in the near term. But the declining bonus depreciation creates urgency for businesses looking to maximize the combined benefit.
Get Your Custom Tax Benefit Analysis
At ProGreen Solar, we provide comprehensive financial models for every commercial solar proposal, including detailed ITC and MACRS calculations tailored to your specific tax situation. We work with your accountant to ensure every dollar of tax benefit is captured.
Call us at (303) 484-1410 or use our solar calculator to start your commercial solar analysis. We will show you not just the energy savings, but the complete tax benefit picture — so you can make a fully informed investment decision.
