Massachusetts Solar Incentives 2026: SMART 3.0, State Credit, Net Metering

Massachusetts solar incentives in 2026: SMART 3.0 pays $0.03 per kWh for 20 years on a home-sized system ($0.06 for income-qualified households), the state income tax credit is 15% of cost up to $1,000, solar is exempt from the 6.25% sales tax and from property tax for 20 years, and net metering credits exports at close to the retail rate.

The catch: as of the Department of Energy Resources' (DOER) July 2026 program update, DOER had not issued any Final Statements of Qualification under SMART 3.0, so no SMART 3.0 payments had begun. The 20-year clock only starts after a project's Final Statement of Qualification, and nothing is backdated.

Massachusetts has some of the highest electricity rates in the country, which is the real reason solar pencils here. The incentives are the second reason — and they are also where quotes go wrong. Below is what each program is worth in 2026, who actually receives the money, and the five lines to check before you sign.

Massachusetts solar incentives 2026 at a glance

Municipal light plant customers (Taunton, Reading, Braintree, Concord, and the other ~40 MLPs) are outside both SMART and the state net metering rules — your town's program is its own thing.

What is SMART 3.0 and how much does it pay in 2026?

The Solar Massachusetts Renewable Target (SMART) program is the state's production incentive: the utility pays the system owner a fixed amount for every kilowatt-hour the system generates — not just what is exported — for a set term. SMART 3.0, under regulation 225 CMR 28.00, took effect September 12, 2025 (amended by emergency regulation June 26, 2026). It requires that on-site construction did not begin before June 20, 2025 — July 1, 2024 for low-income properties — so anything you sign in 2026 is SMART 3.0. Earlier projects qualified under SMART 2.0, which stops accepting applications December 31, 2026.

For home-sized systems the structure is simple. Per the Department of Energy Resources (DOER) Program Year 2026 report, Solar Tariff Generating Units of 25 kW AC or less receive a flat $0.03 per kWh, and Low-Income units receive $0.06 per kWh. The term is 20 years, and the rate you qualify at is locked for that term. DOER sets the flat rate each year from the prior year's average net metering credit value and publishes it in an Annual Report (the 2026 report came out December 1, 2025); applications for a program year are accepted January 1 through December 31. Program Year 2026 has 600 MW AC of capacity for systems subject to the program's capacity cap; DOER lists the 25 kW-and-under flat-rate units separately.

What that is worth on a typical house:

• An 8 kW system in Massachusetts produces roughly 9,000–10,000 kWh a year. At $0.03, that is about $270–$300 a year, or $5,400–$6,000 over 20 years (before panel degradation).
• At the low-income rate, the same system earns about $540–$600 a year, or $10,800–$12,000 over 20 years.
• Payment comes from your utility (Eversource, National Grid, or Unitil) typically as a check or a bill credit, separate from and on top of net metering.

That is real money, but it is smaller than most people remember from SMART 1.0 and 2.0, which paid declining-block rates that were considerably higher in the early blocks. If a proposal shows SMART income of $1,000 or more a year on a home system, it is using an old rate.

Batteries: DOER's 2026 adder table lists an Energy Storage Multiplier of $0.04, calculated through DOER's Energy Storage Adder Calculator. DOER lists the flat 25 kW-and-under rate separately from the adder table, so ask whether the storage adder even applies to a home-sized system — the Energy Storage guideline and calculator decide, not the salesperson. If a quote claims a higher SMART rate because of a battery, ask for the calculator output.

When do SMART 3.0 payments start?

This is the part most 2026 Massachusetts proposals skip. SMART is paid through a utility tariff that the Department of Public Utilities (DPU) has to approve. The utilities filed the SMART 3.0 tariff on November 21, 2025 (docket D.P.U. 25-175). The DPU approved the revised SMART 3.0 tariff on May 19, 2026 and ordered each utility to file its own company-specific version. Until those are approved, DOER's own program page says it will keep accepting applications and issuing Preliminary Statements of Qualification but will not issue Final Statements of Qualification.

Two sentences on that page matter more than any rate: "SMART incentive payments will not be backdated to the project's commercial operation date," and "The 20-year SMART tariff term will begin after DPU approval of the tariff and the issuance of a project's Final Statement of Qualification." In plain terms: every month between the day your system turns on and the day your Final Statement is issued is a month of SMART income you do not get — the 20 years start later, they do not stretch.

What to check in the quote:

• If the savings model shows SMART income starting the month the system is energized, ask the installer what the current tariff status is and to re-run the numbers with SMART starting at Final qualification.
• Ask which program year the application will land in. Program Year 2026 applications must be submitted by December 31, 2026; the 2027 rate will be set in DOER's Program Year 2027 Annual Report and could be different.
• Check DOER's SMART 3.0 Program Details page for the tariff status the week you sign. This was still pending as of DOER's July 2026 update; it may have resolved by the time you read this.

Who keeps the SMART payment on a solar lease or PPA?

SMART pays the owner of the generating unit. On a cash or loan purchase that is you. On a lease or power purchase agreement, the leasing company owns the system, so the 20 years of payments go to it — and it is one of the reasons a third-party owner can offer a low monthly rate. That is not improper, but it has to be visible. DOER requires a Third Party Ownership Customer Disclosure Form under SMART's consumer protection guideline; read it before you sign. If the contract assigns "environmental attributes," "incentives," or "SRECs" (solar renewable energy certificates) to the provider, that is the SMART income leaving with them.

If you are comparing a lease against a loan, put the SMART income back into the comparison on the ownership side — our lease vs. loan vs. cash math shows where it lands. On an 8 kW system that is roughly $5,400–$6,000 over 20 years that the lease column never sees.

Is there a Massachusetts state solar tax credit in 2026?

Yes. The Massachusetts residential energy credit (G.L. c. 62, § 6(d); 830 CMR 62.6.1) is 15% of the net expenditure for solar equipment, or $1,000, whichever is less, claimed on Schedule EC against your state income tax. It has no sunset date. Rules that matter:

• Principal residence only. The regulation covers an owner or tenant who occupies the property as a principal residence; a second home does not qualify.
• Purchase only. "Net expenditure" is the purchase price plus installation cost, less any federal tax credits and less any HUD grants or rebates (830 CMR 62.6.1). The regulation says leasing costs are not qualifying expenditures, so on a lease or PPA there is nothing to claim. (Confirm with your preparer if your contract is unusual.)
• Carryover. If the credit exceeds your tax in the install year, the excess carries forward up to three more years — but it is never refunded. The $1,000 is also a lifetime cap per principal residence: a credit claimed earlier for, say, solar hot water at the same address reduces what is left.
• 2026 note. Because the federal §25D credit no longer exists for installations completed after December 31, 2025, there is no federal credit to subtract from net expenditure. Any system over about $6,700 hits the $1,000 cap.

Does Massachusetts exempt solar from sales and property tax?

Both. Equipment for a solar system used as a primary or auxiliary power source for a principal residence is exempt from the state's 6.25% sales tax (G.L. c. 64H, § 6(dd)). It covers the equipment portion of a Massachusetts system — panels, inverters, racking — not the installation labor, which is not subject to sales tax anyway. If, say, $12,000 of a quote is equipment, that is $750 that should not appear on the invoice. Separately, a solar system is exempt from local property tax for 20 years from installation (G.L. c. 59, § 5, clause 45th), so the added value does not raise your assessment. Neither exemption is a check you receive; the first shows up as a missing line on the invoice and the second as nothing happening to your tax bill. If an installer's quote includes sales tax on a residential system, ask why.

How does net metering work in Massachusetts in 2026?

A residential solar system of 25 kW or less in Eversource, National Grid, or Unitil territory is a "nameplate cap exempt" Class I facility — it can net meter even when the utility's net metering cap is full, and it does not need a cap allocation. You are billed on net monthly consumption; in months you export more than you use, the surplus becomes a dollar credit that never expires and rolls forward.

The credit per exported kWh is not the full retail rate but it is close. Under 220 CMR 18.04 it is built from the per-kWh basic service (supply), distribution, transmission, and transition rates. It excludes the fixed customer charge, the energy efficiency and renewable energy system benefit charges, the energy efficiency reconciliation factor, and the net metering recovery surcharge. The worked example in the DPU's Net Metering Guide: an Eversource East R-1 customer in August 2024 earned about 27.6 cents per kWh (basic service 15.772 + distribution 7.820 + transmission 4.052 + transition −0.037). Basic service rates reset every six months, so the number moves — but a proposal that credits exports at your total bill rate, customer charge included, is overstating them.

One thing that is not on Massachusetts bills: a solar-specific minimum monthly fee. The 2016 Solar Energy Act allowed utilities to ask for a "minimum monthly reliability contribution"; the DPU declined National Grid's request, and although it approved an Eversource version in 2018, it required Eversource to refile under the amended statute — which Eversource has not done to date. There is no such charge in effect in 2026.

What happened to the federal solar tax credit in Massachusetts?

The 30% federal residential credit under Section 25D ended for systems whose installation was completed after December 31, 2025 — for every homeowner-owned system, whether you pay cash, finance it, or hold it in some other structure you own. If your installation was completed in 2025 and the credit was larger than your tax bill, the unused amount still carries forward under §25D(c); ask your CPA. A Massachusetts quote dated 2026 that subtracts 30% from the price of a system you will own is wrong; here is what that tells you about the rep. A third-party owner may be able to claim the commercial credit (§48E), subject to the construction-start and foreign-entity rules that changed in 2025 — and whether that credit is even available on a residential roof is unresolved, so treat it as the provider's problem rather than a settled fact. That is one reason a third-party-owned quote can look relatively better than a purchase quote in 2026. It is the provider's credit, not yours: nothing goes on your tax return, and any value reaches you only through the monthly payment you are quoted — a price the provider sets, and whether it stays a saving depends on the escalator over the term.

Before you sign: 5 incentive lines to check in a Massachusetts solar quote

1. SMART rate and start date. $0.03/kWh (or $0.06 low-income) for 20 years, on all generation, starting at Final Statement of Qualification — not at power-on, and not an old SMART 2.0 block rate.
2. Who receives SMART. On a lease or PPA, confirm in the Third Party Ownership Customer Disclosure Form that the provider keeps it, and price the comparison accordingly.
3. State credit. Up to $1,000 on a purchase for a principal residence; $0 on a lease or PPA.
4. No 30% federal line on a quote for a system you will own. No sales tax line on a residential system.
5. Net metering credit value. Exports credited at the four-component rate (roughly 27 cents in the DPU example), not your all-in bill rate, and no phantom "minimum fee."

Massachusetts solar incentive FAQ

Do I apply for SMART myself?

The installer or developer files the application through your utility's SMART portal; you sign the customer disclosure form and, for the low-income rate, a self-attestation form. Ask for a copy of the Preliminary Statement of Qualification once it is issued.

Can I still get into SMART 2.0?

Effectively no. SMART 2.0 is limited to projects whose on-site construction started before June 20, 2025 (July 1, 2024 for low-income properties), and it stops accepting applications December 31, 2026. Anything you sign in 2026 is SMART 3.0.

Does the Massachusetts state tax credit work on a solar lease?

No. The credit is 15% of your net purchase expenditure; with a lease or PPA you have no purchase expenditure. It also requires the system to serve your principal residence.

Is the SMART rate fixed once I'm in?

Yes — the rate you qualify at is locked for the 20-year term. What changes is the rate offered to new applicants, which DOER resets each program year.

Get your Massachusetts solar quote checked, free

If you have a Massachusetts proposal in hand, send it over and we will check the SMART assumptions, the state credit, the net metering rate, and the federal line against the current rules — the review takes about 15 minutes and costs you nothing. Start a free quote review, or read how the review works first. Solarfying is an independent solar broker; if you go ahead with an installer we introduce, that installer may pay us a referral fee. Homeowners never pay for the review.

Program figures are from DOER's SMART 3.0 Program Year 2026 report and Program Details page (tariff status as of DOER's July 2026 update), MassCEC's SMART 3.0 guide (construction-date cutoffs), the DPU Net Metering Guide (220 CMR 18.00), and 830 CMR 62.6.1. Rates, capacity, and tariff status change; confirm current terms with DOER, your utility, and a tax professional before relying on them. This article is general information, not tax advice.