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Get a Free QuoteModel your year-by-year depreciation schedule with ITC stacking, 20% bonus depreciation, and entity-type comparison. See exactly how much your MA business saves in each tax year.
MACRS Schedule
5 Years
Accelerated depreciation
2026 Bonus
20%
Extra Year 1 deduction
ITC Stacking
30-70%
Section 48/48E credit
MA Excise
8%
On top of 21% federal
A Massachusetts C-corp installing a $200,000 commercial solar system in 2026 can deduct $61,200 in Year 1 alone (36% of $170,000 depreciable basis with 20% bonus). At a 29% combined tax rate, that is $17,748 in Year 1 depreciation savings, plus a $60,000 ITC credit — totaling $77,748 in first-year tax benefits. Over the full 5-year MACRS schedule, total depreciation tax savings reach approximately $49,300. Massachusetts does not conform to federal bonus depreciation, so state and federal schedules differ in Year 1, but the total deduction over 5 years is identical.
The Modified Accelerated Cost Recovery System (MACRS) allows businesses to recover the cost of commercial solar systems through accelerated tax deductions over just 5 years. This is dramatically faster than the 25-30 year useful life of solar panels, front-loading tax benefits into the years when they matter most for cash flow.
For Massachusetts businesses paying $0.22-$0.30/kWh in commercial electricity rates — among the highest in the continental U.S. — MACRS creates a powerful second income stream on top of electricity cost avoidance. The combination of accelerated depreciation deductions with the Section 48 Investment Tax Credit (ITC) means a well-structured commercial solar project can recover 40-60% of its cost in Year 1 alone through tax benefits.
The 5-year MACRS schedule uses the 200% declining balance method, which concentrates deductions in the early years. The standard percentages are: Year 1 (20%), Year 2 (32%), Year 3 (19.2%), Year 4 (11.52%), Year 5 (11.52%), and Year 6 (5.76%). Note that 5-year property actually spans 6 tax years due to the half-year convention — the IRS assumes you placed the asset in service at the midpoint of Year 1, so a half-year of depreciation extends into Year 6.
MACRS is a tax deduction that reduces taxable income. The ITC is a tax credit that reduces tax owed dollar-for-dollar. A $100,000 deduction at a 29% tax rate saves $29,000, while a $100,000 credit saves the full $100,000. Both stack on the same system — the only interaction is that the depreciable basis is reduced by 50% of the ITC claimed.
The Tax Cuts and Jobs Act (TCJA) established 100% bonus depreciation in 2022, with a scheduled phase-down of 20 percentage points per year. In 2026, businesses get 20% first-year bonus depreciation on the adjusted depreciable basis — on top of regular MACRS. In 2027, bonus depreciation drops to 0%. This makes 2026 the absolute last year to capture any bonus depreciation for commercial solar.
2022
100%
Expired
2023
80%
Expired
2024
60%
Expired
2025
40%
Expired
2026
20%
Current
2027
0%
No Bonus
The math is straightforward: with a $170,000 depreciable basis, the 20% bonus in 2026 provides a $34,000 extra Year 1 deduction. At a 29% combined tax rate (C-corp), that is $9,860 in additional Year 1 tax savings compared to a 2027 installation with zero bonus. For pass-through entities at higher marginal rates, the difference is even larger.
Bonus depreciation is based on when the system is placed in service — meaning fully installed, interconnected, and operational — not when the contract is signed or construction begins. If your system is not operational by December 31, 2026, you receive 0% bonus depreciation. For commercial installations that take 3-6 months, this means starting the process no later than mid-2026 to ensure completion.
Below is the complete 5-year MACRS depreciation schedule for a $200,000 commercial solar system with a 30% ITC ($60,000 credit). The depreciable basis is $170,000 ($200,000 - $30,000). With the 2026 bonus, Year 1 captures 36% of the depreciable basis.
Basis calculation: $200,000 system cost - ($60,000 ITC x 50%) = $170,000 depreciable basis
| Year | Standard % | With Bonus % | Deduction | Tax Savings (29%) | Cumulative |
|---|---|---|---|---|---|
| Year 1 | 20.00% | 36.00% | $61,200 | $17,748 | $17,748 |
| Year 2 | 32.00% | 25.60% | $43,520 | $12,621 | $30,369 |
| Year 3 | 19.20% | 15.36% | $26,112 | $7,572 | $37,941 |
| Year 4 | 11.52% | 9.22% | $15,667 | $4,543 | $42,485 |
| Year 5 | 11.52% | 9.22% | $15,667 | $4,543 | $47,028 |
| Year 6 | 5.76% | 4.61% | $7,834 | $2,272 | $49,300 |
| Total | $170,000 | $49,300 | — | ||
The power of commercial solar tax benefits lies in stacking the Section 48/48E ITC with MACRS depreciation. Here is the complete calculation for a $200,000 system with 30% ITC, installed by a C-corporation in 2026.
$200,000 x 30% = $60,000 tax credit
Dollar-for-dollar reduction in federal tax owed. Available for projects beginning construction before July 4, 2026. Bonus adders (domestic content +10%, energy community +10%, low-income +10-20%) can push the ITC to 40-70%.
$200,000 - ($60,000 x 50%) = $170,000
Reduce total cost by half the ITC. This prevents double-dipping between the credit and the deduction. With a 50% ITC, the basis would be $200,000 - $50,000 = $150,000.
$170,000 x 20% = $34,000 bonus in Year 1
This extra first-year deduction is on top of regular MACRS. Only available in 2026 — drops to 0% in 2027. Remaining basis after bonus: $170,000 - $34,000 = $136,000.
$136,000 x 20% = $27,200
Standard first-year MACRS rate applied to the post-bonus remaining basis. Total Year 1 deduction: $34,000 + $27,200 = $61,200.
$60,000 ITC + ($61,200 x 29%) = $60,000 + $17,748 = $77,748
The ITC is a credit (dollar-for-dollar). The depreciation deduction is multiplied by the 29% combined rate (21% federal + 8% MA). Year 1 total benefit = 38.9% of system cost.
| ITC Rate | ITC Amount | Depreciable Basis | 5-Year Depr. Savings | Total Tax Benefit |
|---|---|---|---|---|
| 30% | $60,000 | $170,000 | $49,300 | $109,300 |
| 40% | $80,000 | $160,000 | $46,400 | $126,400 |
| 50% | $100,000 | $150,000 | $43,500 | $143,500 |
| 60% | $120,000 | $140,000 | $40,600 | $160,600 |
| 70% | $140,000 | $130,000 | $37,700 | $177,700 |
Based on $200,000 system, C-corp at 29% combined rate. Higher ITC rates reduce the depreciable basis, but the net benefit always increases because the credit value exceeds the lost depreciation.
The value of MACRS depreciation varies significantly by entity type. C-corporations apply deductions at fixed corporate rates, while pass-through entities allocate deductions to owners at their individual marginal rates. Nonprofits cannot use MACRS at all and must rely on third-party ownership structures.
Federal Rate
21%
MA Rate
8%
Year 1 Savings*
$17,748
Maximum benefit. Deductions offset corporate income directly. Both ITC and MACRS claimed at entity level.
Federal Rate
37%
MA Rate
5%
Year 1 Savings*
$25,704
Deductions pass through to shareholders on K-1. Effective rate depends on each shareholder marginal bracket. Shown at max federal bracket.
Federal Rate
37%
MA Rate
5%
Year 1 Savings*
$25,704
Similar to S-corp. Depreciation allocated per operating agreement. Tax equity structures can optimize allocation to members with highest tax appetite.
Federal Rate
37%
MA Rate
5%
Year 1 Savings*
$25,704
Deductions flow to Schedule C. Effective rate depends on owner total income. Passive activity rules may limit if solar is a separate activity.
Federal Rate
0%
MA Rate
0%
Year 1 Savings*
$0
Cannot use MACRS (no taxable income). Must use PPA or lease where for-profit owner claims MACRS + ITC and passes savings through lower rates.
* Year 1 depreciation savings only (on $61,200 deduction from $200K system with 30% ITC + 20% bonus). Does not include ITC credit itself. Pass-through rates shown at maximum marginal bracket; actual rates vary by individual income.
One of the most common mistakes in commercial solar financial modeling for Massachusetts businesses is assuming that state and federal depreciation schedules are identical. They are not. Massachusetts does not conform to federal bonus depreciation for corporate excise tax purposes, creating a meaningful difference in Year 1 deductions.
Effective rate: 36% of $170,000 basis in Year 1
Effective rate: 20% of $170,000 basis in Year 1
On your MA corporate excise tax return, you must add back the federal bonus depreciation amount and instead deduct only the standard 20% MACRS for Year 1. This means your federal Year 1 deduction is $61,200 (at 21% = $12,852 savings) while your MA Year 1 deduction is $34,000 (at 8% = $2,720 savings). The total over the full 5-year schedule is identical — only the timing differs between state and federal.
For financial modeling purposes, use the combined Year 1 tax savings of $15,572 = $15,572 rather than the simplified 29% combined rate applied to the federal deduction. The simplified approach overstates Year 1 savings and understates Years 2-6.
This state-federal disconnect is particularly important for pass-through entities where shareholders have varying state residency. A Massachusetts S-corp shareholder living in New Hampshire (no income tax) captures only the federal bonus benefit, while a Massachusetts resident captures both the federal bonus and the MA standard MACRS — but on different schedules. Work with a CPA experienced in multi-state solar tax treatment.
Below are pre-calculated MACRS scenarios for three common commercial solar system sizes in Massachusetts, all assuming a 30% ITC, 20% bonus depreciation (2026), and C-corp at 29% combined tax rate.
System cost: $107,500
System cost: $437,500
System cost: $1,350,000
These calculations demonstrate why larger systems have better economics: the per-watt installation cost drops from $2.10-$2.55/W for small business systems (25-100 kW) to $1.20-$1.50/W for large-scale installations (500 kW+), while the tax benefit percentages remain the same. A 1 MW system effectively costs just $612,225 after all tax benefits — roughly $612/kW.
These calculations do not include two additional Massachusetts benefits that further improve economics: (1) Sales tax exemption — solar equipment is exempt from the 6.25% MA sales tax, saving $12,500 on a $200,000 system, and (2) Property tax exemption — commercial solar is exempt from property tax increases for 20 years under M.G.L. c. 59, Section 5, saving approximately $2,700/year ($54,000 over 20 years at average 1.35% MA rate). Neither of these reduces the MACRS depreciable basis.
With bonus depreciation dropping to 0% in 2027, the financial penalty for waiting is clear and quantifiable. Here is a side-by-side comparison for a $200,000 system with 30% ITC, C-corp at 29%:
| Metric | 2026 (20% Bonus) | 2027 (0% Bonus) | Difference |
|---|---|---|---|
| Year 1 Depreciation Deduction | $61,200 | $34,000 | +$27,200 |
| Year 1 Depreciation Tax Savings | $17,748 | $9,860 | +$7,888 |
| Year 1 Total Benefit (ITC + Depr.) | $77,748 | $69,860 | +$7,888 |
| Year 2 Depreciation Deduction | $43,520 | $54,400 | $-10,880 |
Total depreciation over 5 years is identical ($170,000). The bonus only changes timing — more in Year 1, less in Years 2-6. But the time value of money makes Year 1 savings more valuable.
While the total depreciation over the full 5-year schedule is identical ($170,000), the time value of money makes the front-loaded 2026 schedule more valuable. A dollar of tax savings today is worth more than a dollar next year. At a 6% discount rate, the present value of the 2026 schedule is approximately $5,200 higher than the 2027 schedule for this example system.
Beyond the bonus depreciation difference, the Section 48 ITC itself requires construction to begin before July 4, 2026. While there is a safe harbor provision (5% of total cost spent or continuous construction), businesses installing in 2027 face additional compliance requirements to demonstrate timely construction start. Installing in 2026 eliminates this risk entirely.
Complete commercial solar guide: ITC, SMART 3.0, financing, and ROI for MA businesses.
In-depth MACRS guide with case studies, entity comparisons, and MA-specific tax treatment.
Full IRR/NPV calculator combining ITC, MACRS, SMART revenue, and electricity savings.
Calculate your SMART 3.0 commercial rates by utility territory and capacity block.
The calculator takes your total system cost, subtracts 50% of the ITC claimed to get the depreciable basis, then applies the 5-year MACRS percentages (20/32/19.2/11.52/11.52/5.76%) to show your year-by-year deductions. For 2026 installations, 20% bonus depreciation is applied first in Year 1, with the remaining basis following the standard schedule. The calculator multiplies each deduction by your combined federal + state tax rate to show actual dollar savings.
Our team will model the exact depreciation schedule for your MA business — including entity type, ITC adders, and state vs federal differences.