The saving that is invisible because it never existed
Most states charge sales tax on solar equipment and then, in many cases, carve out an exemption for it. Massachusetts, Washington, Connecticut and New Mexico all do some version of that.
New Hampshire has no general sales tax, so there is nothing to charge and nothing to exempt. The equipment simply costs what it costs.
That is worth real money on a system in the twenty to thirty thousand dollar range, and it is a reason a New Hampshire quote can look competitive against a neighbouring state without the installer doing anything differently.
It also means a guide promising you a New Hampshire sales tax exemption is confused. There is no exemption because there is no tax, which is a better outcome but not the one being described.
And the reason there is no state credit
New Hampshire levies no personal income tax on wages. A state income tax credit works by reducing state income tax owed, so a state without the tax cannot offer that instrument.
This is structural rather than a policy gap someone might fill next session. It also means the familiar pattern of stacking a federal credit on a state credit has never applied here.
The state did have a cash rebate instead, at $0.20 per watt up to $1,000, which is how a state without an income tax delivers an incentive. SB 303 permanently repealed it in 2024.
So with the federal credit also gone after 2025, there is now no cash or tax incentive at either level for a New Hampshire cash or loan purchase.
What has to carry the case instead
The electricity price. New Hampshire residential power runs around 24 to 27 cents per kWh against a national average near 18.4, which makes every displaced kilowatt hour worth substantially more than it would be in most of the country.
Net Metering 2.0 credits exports at 100 percent of supply, 100 percent of transmission and 25 percent of distribution, roughly 75 to 95 percent of retail. Self-consumed electricity displaces the full retail price.
The RSA 72:62 property tax exemption, if your municipality has adopted it, which is a question for your own assessing office rather than for a statewide guide.
And the absence of sales tax, which is already in your quoted price rather than being something to claim. Ask for a projection built from those four things and nothing else.
The pieces that remain, kept separate
Strike the federal residential credit and any state rebate from a quote that shows either, since Section 25D expired for property placed in service after December 31, 2025 and SB 303 repealed the state rebate in 2024.
Do not expect a state tax credit or a sales tax exemption line, because New Hampshire has neither the income tax to credit against nor the sales tax to exempt.
Rebuild from Net Metering 2.0 at the partial credit rate, the property tax exemption if your town has adopted it, and any battery incentive you have confirmed directly with your utility.
Then add the electricity you stop buying at your actual rate. In New Hampshire that is nearly the entire case, which is why the rate and production assumptions deserve the scrutiny.