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NuWatt designs, installs, and manages solar, battery, heat pump, and EV charger systems across 9 states. One company, one warranty, one point of contact.
Get a Free Quote5-year accelerated depreciation + 100% first-year bonus + Section 48 ITC stacking. The 100% bonus is permanent under OBBBA — no year-by-year phasedown.
MACRS Schedule
5 Years
vs. 25+ year panel life
First-Year Bonus
100%
Entire basis deducted Year 1
Bonus Status
Permanent
Restored by OBBBA
ITC Stacking
30-70%
Section 48/48E credit
The Modified Accelerated Cost Recovery System (MACRS) is the federal depreciation method that lets a business recover the cost of a capital asset through annual income-tax deductions. Commercial solar qualifies as 5-year property — the IRS lets you write the system off over five tax years even though the panels run 25-30+ years. Because the schedule front-loads the deductions (and a permanent 100% first-year bonus, covered below, can pull the entire basis into Year 1), the cash-flow benefit lands exactly when you are still recovering the investment.
MACRS is a deduction, not a credit: it lowers taxable income rather than offsetting tax dollar-for-dollar. That distinction matters in Massachusetts more than in most states, because — as the section below details — MA decouples from federal bonus depreciation for corporate-excise purposes. The federal and state timelines diverge in Year 1 even though the total write-off is identical. For a full walkthrough of the federal mechanics that apply identically in every state, see our national MACRS depreciation guide.
What makes the math work in Massachusetts specifically is the rate environment. MA commercial electricity averages roughly $0.227/kWh across the territory — Eversource, National Grid, Unitil, and the Cape Light Compact — among the highest in the continental U.S. Commercial installed pricing runs about $2.10-$2.55/W for small (25-100 kW) rooftops, $1.60-$1.90/W mid-size, and $1.20-$1.50/W at large scale. High avoided-energy cost plus accelerated depreciation is what compresses payback into the 2-4 year range for a profitable C-corp.
MACRS is one layer of a Massachusetts-specific stack, and the layers do not compete — they compound. A typical MA commercial project pairs federal MACRS + bonus depreciation with:
Tax depreciation is the front-loaded piece; SMART and net metering are the multi-year revenue tail. Modeling them together is what produces the sub-4-year payback MA businesses see.
On top of the standard 5-year schedule, commercial solar qualifies for 100% first-year bonus depreciation — permanently restored by OBBBA (IRC §168(k)) for property placed in service after January 19, 2025. The entire adjusted depreciable basis is deductible in Year 1 on the federal return. This is federal law and identical in all 50 states. The Massachusetts wrinkle is the state side: MA does not conform to the federal bonus, so the Year-1 deduction differs on your MA corporate-excise return (detailed in the Massachusetts-specific section below).
2022
100%
Expired
2023
80%
Expired
2024
60%
Expired
2025
100%
Current
2026
100%
Current
2027
100%
Current
The Tax Cuts and Jobs Act (TCJA) had begun phasing bonus depreciation down from 100% (2022) toward 0% by 2027. OBBBA (IRC Section 168(k)) reversed that and permanently restored 100% first-year bonus depreciation for property placed in service after January 19, 2025. A system placed in service in 2026 or 2027 both receive the full 100% bonus, so the deduction is no longer a race against a calendar deadline. On a $200,000 MA system, the bonus pulls the full $170,000 depreciable basis into Year 1 federally, worth roughly $35,700 in Year-1 federal tax savings (21%). The 8% MA corporate-excise benefit is not accelerated — Massachusetts decouples from the bonus, so the state portion is recovered across the standard 5-year schedule (see the decoupling table below).
The MACRS 5-year property class uses the 200% declining balance method switching to straight-line in the later years. With the permanent 100% first-year bonus (OBBBA), Year 1 captures 100% of the depreciable basis — the entire deduction in a single year. The standard schedule is shown alongside for comparison, and Massachusetts (which does not conform to the federal bonus) follows the standard percentages.
| Year | Standard MACRS | With 100% Bonus | On $170K Basis* |
|---|---|---|---|
| Year 1 | 20.00% | 100.00% | $170,000 |
| Year 2 | 32.00% | 0.00% | $0 |
| Year 3 | 19.20% | 0.00% | $0 |
| Year 4 | 11.52% | 0.00% | $0 |
| Year 5 | 11.52% | 0.00% | $0 |
| Year 6 | 5.76% | 0.00% | $0 |
| Total | 100% | 100% | $170,000 |
* Example: $200,000 system with 30% ITC. Depreciable basis = $200,000 - ($60,000 x 50%) = $170,000
The ITC-plus-MACRS interaction is federal and works the same in every state, so we keep this summary tight: an owner claims both the Section 48/48E ITC and 5-year MACRS, and the only coupling is that the depreciable basis is reduced by half the credit claimed. In Massachusetts the one twist is the state side — the bonus piece of Step 3 is added back on the MA return (see the decoupling table above). The four steps below use a $200,000 MA system; for the deeper federal treatment see the Section 48/48E ITC guide.
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 100% first-year bonus (permanent under OBBBA) to the adjusted basis. The entire depreciable basis is deducted in Year 1, leaving nothing for the standard schedule.
Bonus: $170,000 x 100% = $170,000. Remaining basis: $0. Year 1 total: $170,000
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 + ($170,000 x 21% federal) = $60,000 + $35,700 = $95,700 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.
The single most important Massachusetts-specific rule for solar depreciation is that MA decouples from the federal bonus deduction. The 100% first-year bonus accelerates your federal tax only; for the Massachusetts corporate excise you add the bonus back and recover the basis on the regular five-year schedule. Both returns ultimately deduct the same total — only the Year-1 timing differs. Getting this right is the difference between an accurate pro-forma and one that overstates the Year-1 state benefit. Below are the four MA-specific levers that affect 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
The bonus pulls the full basis into Year 1 federally; Massachusetts spreads the same basis over the regular 5-year MACRS schedule. The total deducted is $170,000 on both returns — the add-back simply defers the state benefit into Years 2-6 rather than eliminating it.
| Year | Federal (100% bonus) | MA corporate excise (regular MACRS) |
|---|---|---|
| Year 1 | $170,000 | $34,000 |
| Year 2 | $0 | $54,400 |
| Year 3 | $0 | $32,640 |
| Year 4 | $0 | $19,584 |
| Year 5 | $0 | $19,584 |
| Year 6 | $0 | $9,792 |
| Total | $170,000 | $170,000 |
The $170,000 basis = a $200,000 system after the 30% ITC basis reduction. The 8% MA corporate-excise benefit accrues across Years 1-6 rather than entirely in Year 1. Confirm your add-back treatment with your CPA — entity type and apportionment affect the result.
These are the revenue programs unique to Massachusetts that stack on top of the (state-decoupled) depreciation benefit. SMART 3.0 in particular is the long-tail revenue layer that distinguishes MA from neighboring states' ZREC or net-energy-billing regimes:
SMART 3.0
The Solar Massachusetts Renewable Target program pays a fixed per-kWh incentive over a 10-20 year term, with adders for storage, low-income, and land-use siting. This is a production-based revenue stream layered above net metering.
ConnectedSolutions
For paired battery storage, Eversource/National Grid demand-response events pay per-kW of dispatched capacity (up to ~$225/kW-yr) — a revenue layer no neighboring state offers in the same form.
Class II (25 kW - 1 MW)
Net metering at retail rate minus the minimum monthly charge. Most common for mid-size commercial rooftops.
Class III (1 MW - 5 MW)
Negotiated rate (typically wholesale plus capacity value). For large commercial/industrial arrays.
SMART block rates decline as statewide capacity fills and vary by utility and project type — confirm the current block and adders for your specific interconnection before modeling.
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. Projects that begin construction on or before July 4, 2026 lock in the most flexible placed-in-service window (through roughly 2030); projects beginning after that date still qualify but generally must be placed in service by December 31, 2027.
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). Projects that begin construction by July 4, 2026 lock in the full credit timing; projects that start later still qualify if placed in service by December 31, 2027. The system owner — not the installer — claims the ITC.
MACRS only delivers value if the owner has taxable income to offset. In Massachusetts there is a second consideration layered on the federal one: because MA decouples from the bonus, the federal Year-1 benefit is front-loaded while the state (8% corporate-excise) benefit accrues across the regular schedule. Entities with steady MA-source income capture both tails; an entity with little near-term income may prefer to carry deductions forward. How each structure fares:
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 (100%)
$76,500 x 100% = full basis deducted
$76,500
Regular Year 1 MACRS (on remainder)
($76,500 - $76,500) x 20% = $0 remaining
$0
Total Year 1 Depreciation Deduction
$76,500 + $0
$76,500
Year 1 Depreciation Tax Savings (federal)
$76,500 x 21% federal — MA decouples, so the 8% state benefit accrues over the 5-yr schedule
$16,065
Total Year 1 Tax Benefit
$27,000 ITC + $16,065 depreciation savings
$43,065
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)
Because Massachusetts decouples from the federal bonus, the ~$6,120 of MA corporate-excise depreciation benefit lands across the 5-year schedule rather than in Year 1 — it is not shown above but still reduces lifetime cost. Annual electricity savings ($18,000/yr) and SMART revenue ($3,600/yr) further compound the return. Typical payback: 2-4 years for a profitable MA C-corp.
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. Under OBBBA, 100% first-year bonus depreciation is permanently available, letting you deduct the entire depreciable basis in Year 1. The depreciable basis is reduced by 50% of any ITC claimed.
Under OBBBA, businesses can claim 100% first-year bonus depreciation on the adjusted depreciable basis of a solar system, deducting the entire basis in Year 1 instead of spreading it across the 5-year MACRS schedule. For example, on a $90,000 system with 30% ITC ($27,000), the depreciable basis is $76,500, and the full $76,500 is deductible in Year 1. The 100% bonus is permanent for property placed in service after January 19, 2025, so there is no phasedown to plan around.
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. Over the life of the asset they deduct MACRS against corporate income at the 21% federal rate plus the 8% MA corporate-excise rate, for up to a 29% combined marginal benefit on the depreciable basis. Timing differs by jurisdiction, though: because Massachusetts decouples from the federal bonus, the federal benefit front-loads into Year 1 while the 8% state portion is recovered across the regular 5-year schedule. S-corporations and multi-member LLCs also benefit, as 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.
No. OBBBA permanently restored 100% first-year bonus depreciation (IRC Section 168(k)) for property acquired and placed in service after January 19, 2025. This reversed the old TCJA phasedown (100% in 2022, 80% in 2023, 60% in 2024, 40% in 2025, and a scheduled 0% in 2027). A project placed in service in 2026 or 2027 both receive the full 100% bonus, so there is no longer a year-by-year cliff. Taxpayers may elect a 40% rate instead if it suits their planning.
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.
Begin construction on or before July 4, 2026 to lock in the most flexible Section 48E timing; later starts must be placed in service by Dec 31, 2027. The 100% first-year bonus depreciation is permanent under OBBBA.