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Get a Free Quote5-year accelerated depreciation + 20% first-year bonus + Section 48 ITC stacking. 2026 is the last year with any bonus depreciation — it drops to 0% in 2027.
MACRS Schedule
5 Years
vs. 25+ year panel life
2026 Bonus
20%
First-year extra deduction
2027 Bonus
0%
No bonus after 2026
ITC Stacking
30-70%
Section 48/48E credit
The Modified Accelerated Cost Recovery System (MACRS) is a federal tax depreciation method that allows businesses to recover the cost of capital assets through annual deductions. Commercial solar energy systems qualify for 5-year MACRS depreciation — meaning the IRS lets you write off the entire cost of a solar system over just 5 tax years, even though solar panels last 25-30+ years.
This is not a tax credit — it is a tax deduction that reduces your taxable income. The faster you can deduct the cost, the sooner you reduce your tax bill and recover your investment. MACRS front-loads these deductions, with the largest percentages in Years 1 and 2.
For Massachusetts businesses, MACRS is particularly powerful because MA has among the highest commercial electric rates in the continental U.S. ($0.22-$0.30/kWh). When you combine accelerated depreciation tax savings with actual electricity cost avoidance, the payback period on commercial solar drops dramatically — often to 3-5 years.
Without MACRS, a business would depreciate solar panels over their useful life (25-39 years using straight-line depreciation), generating small annual deductions. MACRS compresses the entire deduction into 5 years, with most of the value concentrated in Years 1-3. This creates significantly larger deductions when they matter most — during the early years of system ownership when you are recovering your investment.
In addition to the standard 5-year MACRS schedule, commercial solar systems placed in service in 2026 qualify for 20% first-year bonus depreciation. This allows businesses to deduct an extra 20% of the adjusted depreciable basis in Year 1 — on top of the regular MACRS percentage.
2022
100%
Expired
2023
80%
Expired
2024
60%
Expired
2025
40%
Expired
2026
20%
Current
2027
0%
No Bonus
The Tax Cuts and Jobs Act (TCJA) established a phase-down from 100% bonus depreciation in 2022 to 0% by 2027. A system placed in service in 2026 gets 20% bonus. A system placed in service in 2027 gets nothing — only the standard 5-year MACRS schedule. For a $200,000 system, this timing difference means approximately $9,860 more in Year 1 tax savings by acting in 2026.
The MACRS 5-year property class uses the 200% declining balance method switching to straight-line in the later years. With the 2026 bonus, Year 1 captures 36% of the depreciable basis — nearly double the standard rate.
| Year | Standard MACRS | With 20% Bonus (2026) | On $170K Basis* |
|---|---|---|---|
| Year 1 | 20.00% | 36.00% | $61,200 |
| Year 2 | 32.00% | 25.60% | $43,520 |
| Year 3 | 19.20% | 15.36% | $26,112 |
| Year 4 | 11.52% | 9.22% | $15,674 |
| Year 5 | 11.52% | 9.22% | $15,674 |
| Year 6 | 5.76% | 4.60% | $7,820 |
| Total | 100% | 100% | $170,000 |
* Example: $200,000 system with 30% ITC. Depreciable basis = $200,000 - ($60,000 x 50%) = $170,000
Businesses that own their commercial solar system can claim both the Section 48/48E Investment Tax Credit (ITC) and MACRS depreciation. The key interaction: the depreciable basis must be reduced by 50% of the ITC claimed. Here is the step-by-step calculation:
The ITC is a dollar-for-dollar federal tax credit. The base rate is 30% for projects meeting prevailing wage + apprenticeship requirements. Bonus adders can push this to 40%, 50%, or up to 70%.
$200,000 system x 30% = $60,000 ITC (tax credit, not deduction)
Reduce the total system cost by 50% of the ITC claimed. This prevents "double-dipping" — you still depreciate most of the cost, but not the full ITC-covered portion.
$200,000 - ($60,000 x 50%) = $200,000 - $30,000 = $170,000 depreciable basis
Apply the 20% first-year bonus to the adjusted basis, then apply the standard Year 1 MACRS rate (20%) to the remaining balance. The result is a 36% effective Year 1 rate.
Bonus: $170,000 x 20% = $34,000. Regular MACRS: $136,000 x 20% = $27,200. Year 1 total: $61,200
Combine the ITC (dollar-for-dollar credit) with the depreciation deduction (multiplied by your marginal tax rate). For a C-corp, the federal rate is 21%.
$60,000 ITC + ($61,200 x 21% federal) = $60,000 + $12,852 = $72,852 Year 1 federal tax benefit
| ITC Rate | Basis Reduction | Depreciable % of Cost | On $200K System |
|---|---|---|---|
| 30% | 15% | 85% | $170,000 |
| 40% | 20% | 80% | $160,000 |
| 50% | 25% | 75% | $150,000 |
| 60% | 30% | 70% | $140,000 |
| 70% | 35% | 65% | $130,000 |
Formula: Depreciable Basis = System Cost - (ITC Amount x 50%). Higher ITC = lower depreciable basis, but the ITC credit itself more than compensates.
Massachusetts has its own rules for depreciation and solar tax treatment. Understanding the state-level nuances is critical for accurate financial modeling.
Massachusetts does not conform to federal bonus depreciation for corporate excise tax purposes. This means:
Total depreciation over 5 years is the same — only timing differs.
Solar equipment is exempt from the 6.25% Massachusetts sales tax. This is an at-purchase savings — no application required.
On a $200,000 system: $12,500 instant savings
Does NOT reduce MACRS depreciable basis
Commercial solar systems are exempt from property tax increases for 20 years under M.G.L. c. 59, Section 5.
On a $200,000 system: ~$2,700/year saved (at ~1.35% MA avg tax rate)
$54,000 total over 20 years. Does NOT reduce MACRS basis
Massachusetts has two commercial net metering classes that generate additional revenue on top of MACRS tax savings:
Class II (25 kW - 1 MW)
Retail rate minus minimum monthly charge. Most common for mid-size commercial.
Class III (1 MW - 5 MW)
Negotiated rate (typically wholesale + capacity value). For large commercial/industrial.
The Section 48/48E commercial ITC starts at a 30% base rate and can stack up to 70% with bonus adders. Each adder has specific eligibility requirements. The ITC is available for projects that begin construction before July 4, 2026.
Base ITC: 30%
Prevailing wage + apprenticeship (projects > 1 MW)
Domestic Content (FEOC): +10%
US-manufactured steel, iron, and components. Deadline: July 4, 2026
Energy Community: +10%
Brownfield, closed coal mine/plant, or fossil fuel employment area (check ZIP)
Low-Income: +10-20%
Located in low-income community or serving low-income beneficiaries
Maximum possible ITC: 30% + 10% + 10% + 20% = 70%. On a $200,000 system, that is $140,000 in tax credits.
The residential solar tax credit (Section 25D) expired December 31, 2025. Homeowners who buy solar with cash or a loan receive $0 from the federal government. The Section 48/48E commercial ITC is a separate program that remains available for commercial projects (including third-party-owned residential systems under PPA/lease structures) that begin construction before July 4, 2026. The system owner — not the installer — claims the ITC.
MACRS depreciation requires taxable income to be effective — the deduction is only valuable if you have income to offset. Different business structures benefit in different ways.
Maximum benefit. C-corps deduct MACRS directly against corporate income. The 21% federal rate + 8% MA rate = up to 29% marginal tax savings on depreciable amount.
MACRS deductions pass through to shareholders on Schedule K-1. Each shareholder deducts their pro-rata share against personal income. Requires sufficient tax basis.
Similar to S-corps. Depreciation allocations flow through to members per the operating agreement. Tax equity partnerships can optimize allocation.
MACRS deductions flow to Schedule C. Effective if the owner has significant business income. Limited by passive activity rules if solar is a separate activity.
Cannot use MACRS directly (no taxable income). Instead, use PPA/lease structures where the for-profit system owner claims MACRS + ITC and passes savings through lower rates.
Let us walk through a real-world example of a 50 kW commercial solar system on a small business rooftop in Worcester, Massachusetts. This shows how MACRS, ITC, and MA-specific benefits stack together.
System Size
50 kW
Gross Cost
$90,000
Location
Worcester, MA
Entity Type
C-Corp
Section 48 ITC (30%)
$90,000 x 30% = dollar-for-dollar tax credit
$27,000
Depreciable Basis
$90,000 - ($27,000 x 50%) = adjusted basis
$76,500
Year 1 Bonus Depreciation (20%)
$76,500 x 20% = bonus deduction
$15,300
Regular Year 1 MACRS (20%)
($76,500 - $15,300) x 20%
$12,240
Total Year 1 Depreciation Deduction
$15,300 + $12,240
$27,540
Year 1 Depreciation Tax Savings
$27,540 x 29% (21% fed + 8% MA)
$7,987
Total Year 1 Tax Benefit
$27,000 ITC + $7,987 depreciation savings
$34,987
Sales Tax Savings
$5,625
6.25% exemption at purchase
Property Tax Savings
~$1,215/yr
20-year exemption (~$24,300 total)
Annual Electricity Savings
~$18,000/yr
60,000 kWh x ~$0.25-$0.30/kWh avg commercial rate
SMART Program Revenue
~$3,600/yr
Declining block rate x 20 years (varies by capacity block)
Additional MACRS deductions in Years 2-6 plus annual electricity savings ($18,000/yr) and SMART revenue ($3,600/yr) further reduce effective cost. Typical payback: 2-4 years for MA C-corps.
Common questions from CFOs, business owners, and tax advisors about MACRS solar depreciation in Massachusetts.
MACRS (Modified Accelerated Cost Recovery System) allows Massachusetts businesses to depreciate commercial solar systems over 5 years for federal tax purposes, even though solar panels last 25+ years. This front-loads tax deductions, creating significant cash flow benefits in the early years of ownership. In 2026, an additional 20% first-year bonus depreciation is available, further accelerating the tax benefit. The depreciable basis is reduced by 50% of any ITC claimed.
In 2026, businesses can claim 20% first-year bonus depreciation on the adjusted depreciable basis of a solar system, on top of regular MACRS depreciation. For example, on a $90,000 system with 30% ITC ($27,000), the depreciable basis is $76,500. The 20% bonus is $15,300, plus regular first-year MACRS of $12,240 on the remaining balance. This is the last year with any bonus depreciation -- it drops to 0% in 2027.
Yes. Businesses that own their commercial solar system can claim both the Section 48/48E ITC (30% base, up to 70% with adders) AND 5-year MACRS depreciation. The only interaction is that the depreciable basis must be reduced by 50% of the ITC claimed. For a 30% ITC, the depreciable basis becomes 85% of the system cost. For a 50% ITC, the depreciable basis becomes 75%. Both benefits require system ownership -- PPA and lease structures transfer these benefits to the third-party owner.
No. Massachusetts does NOT conform to federal bonus depreciation for corporate excise tax purposes. MA businesses must add back the federal bonus depreciation amount on their MA corporate return and instead follow the standard 5-year MACRS schedule for state tax calculations. This means the federal and state depreciation deductions differ in Year 1. However, the total depreciation over the 5-year period is the same -- only the timing differs.
When combining MACRS with the Section 48 ITC, the depreciable basis is reduced by 50% of the ITC claimed. The formula is: Depreciable Basis = Total System Cost - (ITC Amount x 50%). For example, a $200,000 system with a 30% ITC ($60,000) has a depreciable basis of $200,000 - $30,000 = $170,000. With a 50% ITC ($100,000), the depreciable basis would be $200,000 - $50,000 = $150,000.
C-corporations with high taxable income benefit most, since they can directly deduct MACRS against corporate income at the 21% federal rate plus 8% MA corporate excise tax rate. S-corporations and multi-member LLCs also benefit, as depreciation deductions pass through to owners/shareholders via K-1s. Nonprofits and public entities cannot use MACRS directly but benefit indirectly through PPA/lease structures where the for-profit system owner claims MACRS and passes savings through lower rates.
Yes. 2026 offers 20% first-year bonus depreciation for commercial solar -- down from 40% in 2025, 60% in 2024, 80% in 2023, and 100% in 2022. In 2027, bonus depreciation drops to 0%. This means 2026 is the final year to capture any first-year bonus depreciation above the standard 20% MACRS Year 1 rate. Projects placed in service in 2027 or later will follow the standard 5-year MACRS schedule without any bonus.
Massachusetts offers two additional tax benefits that stack with MACRS: (1) Sales tax exemption -- solar equipment is exempt from the 6.25% MA sales tax, and (2) Property tax exemption -- commercial solar systems are exempt from property tax increases for 20 years under M.G.L. c. 59, Section 5. On a $200,000 commercial system, the sales tax exemption alone saves $12,500. These exemptions apply automatically and do not reduce the MACRS depreciable basis.
Full commercial solar guide: ITC stacking, SMART 3.0, financing, and ROI for MA businesses.
All federal tax credits for commercial solar: ITC, MACRS, domestic content, energy community, and more.
Deep dive into the commercial Investment Tax Credit: eligibility, base rate, bonus adders, and deadlines.
National commercial solar pricing by system size tier. Small business, mid-size, and large-scale benchmarks.
Get a personalized MACRS + ITC tax savings analysis for your Massachusetts business. Our team will model the exact Year 1 benefit based on your system size, entity type, and tax situation.
Projects must begin construction before July 4, 2026 to qualify for Section 48 ITC. 2026 is the last year for bonus depreciation (drops to 0% in 2027).