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Get a Free QuoteModel your year-by-year depreciation schedule with ITC stacking, 100% first-year bonus depreciation, and entity-type comparison. See exactly how much your MA business saves in each tax year.
MACRS Schedule
5 Years
Accelerated depreciation
Bonus Depreciation
100%
Permanent under OBBBA
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 can deduct the entire $170,000 depreciable basis in Year 1 thanks to the permanent 100% federal bonus depreciation (OBBBA). At a 29% combined tax rate, that is roughly $49,300 in depreciation tax savings — all in Year 1 — plus a $60,000 ITC credit, totaling about $109,300 in first-year tax benefits. Massachusetts does not conform to federal bonus depreciation, so the MA portion follows the standard 5-year schedule; the total deduction over 5 years is identical, only the state timing differs.
Adjust the inputs to model your facility.
Federal ITC (30%)
$60,000
Depreciable basis
$170,000
Cost − 50% of ITC
Year-1 bonus deduction (100%)
$170,000
Full basis, expensed year one
Year-1 depreciation tax savings
$35,700
at 21% tax rate
Combined first-year benefit
$95,700
ITC + depreciation savings
Effective net cost after year 1
$104,300
Estimates only — confirm with a tax professional. Assumes 100% first-year bonus depreciation (OBBBA, IRC §168(k), for property placed in service after Jan 19, 2025) and that the ITC reduces the depreciable basis by half the credit. State conformity to federal bonus depreciation varies (Massachusetts, for example, decouples). Tax-exempt entities use Direct Pay for the ITC and cannot claim MACRS.
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, then began a phase-down of 20 percentage points per year (80% in 2023, 60% in 2024, 40% in 2025). OBBBA (IRC Section 168(k)) reversed that phase-down and permanently restored 100% first-year bonus depreciation for property acquired and placed in service after January 19, 2025 — on top of regular MACRS. There is no longer a 2027 cliff: a system placed in service in 2026 or 2027 both receive the full 100% bonus. Taxpayers may elect a 40% rate instead if it suits their planning.
2022
100%
Expired
2023
80%
Expired
2024
60%
Expired
2025
100%
Current
2026
100%
Current
2027
100%
Current
The math is straightforward: with a $170,000 depreciable basis, the 100% bonus lets you deduct the entire $170,000 in Year 1 instead of spreading it across the 5-year MACRS schedule. At a 29% combined tax rate (C-corp), that front-loads roughly $49,300 of depreciation tax savings into Year 1. For pass-through entities at higher marginal rates, the Year 1 benefit is even larger.
Bonus depreciation is claimed in the tax year the system is placed in service — meaning fully installed, interconnected, and operational — not when the contract is signed or construction begins. Because the 100% bonus is permanent under OBBBA, the rate does not change from one year to the next; the placed-in-service date simply determines which tax year you claim the full deduction. (It also governs Section 48E ITC timing, where beginning construction on or before July 4, 2026 locks in the most flexible placed-in-service window.)
Below is the complete 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 permanent 100% first-year bonus (OBBBA), Year 1 captures 100% of the depreciable basis; the standard 5-year MACRS column is shown for comparison. Massachusetts does not conform to the federal bonus, so the MA schedule follows the standard percentages.
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% | 100.00% | $170,000 | $49,300 | $49,300 |
| Year 2 | 32.00% | 0.00% | $0 | $0 | $49,300 |
| Year 3 | 19.20% | 0.00% | $0 | $0 | $49,300 |
| Year 4 | 11.52% | 0.00% | $0 | $0 | $49,300 |
| Year 5 | 11.52% | 0.00% | $0 | $0 | $49,300 |
| Year 6 | 5.76% | 0.00% | $0 | $0 | $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. Beginning construction on or before July 4, 2026 locks in the most flexible Section 48E timing (placed in service through ~2030); later starts still qualify but generally must be placed in service by December 31, 2027. 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 100% = $170,000 deducted in Year 1
Permanent under OBBBA (IRC Section 168(k)) for property placed in service after January 19, 2025. The entire depreciable basis is deducted in Year 1. Remaining basis after bonus: $170,000 - $170,000 = $0.
$0 remaining x 20% = $0
With the full 100% bonus, nothing remains to depreciate under the standard schedule. Total Year 1 federal deduction: $170,000.
$60,000 ITC + ($170,000 x 29%) = $60,000 + $49,300 = $109,300
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 = 54.7% of system cost. (Massachusetts does not conform to the federal bonus, so the MA portion follows the standard 5-year schedule.)
| 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*
$49,300
Maximum benefit. Deductions offset corporate income directly. Both ITC and MACRS claimed at entity level.
Federal Rate
37%
MA Rate
5%
Year 1 Savings*
$71,400
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*
$71,400
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*
$71,400
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 the full $170,000 deduction from a $200K system with 30% ITC + 100% first-year bonus). Does not include ITC credit itself. Massachusetts does not conform to the federal bonus, so the MA portion follows the standard 5-year schedule; figures above reflect the federal bonus timing. 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: 100% 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. With the federal 100% bonus, your federal Year 1 deduction is $170,000 (at 21% = $35,700 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 $38,420 = $38,420 rather than the simplified 29% combined rate applied to the full federal deduction. The state add-back means MA savings are spread across the 5-year schedule even though the federal bonus is taken entirely in Year 1.
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, 100% first-year bonus depreciation (permanent under OBBBA), 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.
The permanent 100% bonus does not change the total deduction over the life of the asset — it changes the timing, front-loading the entire deduction into Year 1. Here is a side-by-side comparison for a $200,000 system with 30% ITC, C-corp at 29%, showing the 100% bonus against electing the standard 5-year schedule:
| Metric | 100% Bonus | Standard 5-Year MACRS | Difference |
|---|---|---|---|
| Year 1 Depreciation Deduction | $170,000 | $34,000 | +$136,000 |
| Year 1 Depreciation Tax Savings | $49,300 | $9,860 | +$39,440 |
| Year 1 Total Benefit (ITC + Depr.) | $109,300 | $69,860 | +$39,440 |
| Year 2 Depreciation Deduction | $0 | $54,400 | $-54,400 |
Total depreciation over the life of the asset is identical ($170,000). The 100% bonus only changes timing — all of it in Year 1, nothing in later years. The time value of money makes the front-loaded Year 1 savings more valuable.
While the total depreciation is identical either way ($170,000), the time value of money makes the front-loaded 100% bonus 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 taking the full deduction in Year 1 is approximately $5,200 higher than spreading it across the standard 5-year schedule for this example system.
Timing still matters for the Section 48E ITC: beginning construction on or before July 4, 2026 locks in the most flexible placed-in-service window (through roughly 2030). Projects that begin construction after that date still qualify for the credit, but generally must be placed in service by December 31, 2027. The safe harbor provisions (5% of total cost spent, or physical work of a significant nature) establish a qualifying construction start.
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.
Model your facility's exact MACRS + ITC savings
Get a depreciation schedule built for your entity type, system size, and tax position.
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. Under OBBBA, 100% first-year bonus depreciation lets you deduct the entire depreciable basis in Year 1; the calculator can also model the standard 5-year schedule for comparison. Each deduction is multiplied 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.