Energy and IRA tax credits for homeowners: solar, heat pumps, EV chargers, and weatherization

The Inflation Reduction Act (IRA, 2022) supercharged the federal residential energy tax credits. Solar gets you 30% off your federal tax bill with no cap. Heat pumps: up to $2,000/yr. Insulation and air sealing: up to $1,200/yr. Most have no income limit and run through 2032, then phase down. Stack them with state and utility rebates and the math gets aggressive.

This guide covers what you can actually claim today, the limits, the forms, and how to plan multi-year projects to maximize the buckets.

This is a guide, not tax advice. The credits interact with rental classification, basis tracking, and your overall tax picture in specific ways — consult a CPA before a six-figure install.

The two main credit categories

Two separate credits, two separate structures, two separate sets of limits. Don’t conflate them.

• §25D Residential Clean Energy Credit: solar, geothermal, batteries, wind. 30%, no annual cap, runs through 2032 then phases down.
• §25C Energy Efficient Home Improvement Credit: heat pumps, insulation, windows, doors, audits, panels. 30% with annual per-bucket caps, resets every year.

Both are claimed on IRS Form 5695 with your 1040.

§25D Residential Clean Energy Credit (the big one)

The flagship. 30% of total installed cost (equipment + labor + permits) with no annual dollar cap for most categories. This is the credit that makes solar work financially in many markets.

Eligible improvements

• Solar PV systems (panels, inverters, racking, labor)
• Solar water heaters (must be SRCC-certified and serve the home)
• Geothermal heat pumps (ENERGY STAR-certified)
• Wind turbines
• Battery storage with capacity of 3 kWh or more (added by IRA; previously had to be solar-coupled)
• Fuel cells (capped at $500 per 0.5 kW capacity, $1,667/kW)

Phase-down schedule

• 30% through Dec 31, 2032
• 26% in 2033
• 22% in 2034
• 0% after 2034 (scheduled)

Refundability and carryforward

The credit is non-refundable — it can’t reduce your tax below zero. But the unused portion carries forward to subsequent tax years (§25D(c)) until used. If you owe $4,000 in tax and your credit is $11,000, you use $4,000 this year and carry $7,000 forward. Useful for households with low current liability and high future income. The statute permits carryforward “to the succeeding taxable year” recursively while the credit exists; treatment of unused credit after the §25D sunset (post-2034) is uncertain.

Eligible homes

• Primary residence: yes
• Second home: yes (one notable exception: fuel cells, primary only)
• Rental property: NO — these are personal residence credits. Rental owners may have separate options under the §48 commercial energy credit (totally different rules; talk to a CPA).
• Must be NEW equipment, not used.

Worked example

You install a $25,000 solar PV system and a $12,000 battery on your primary residence.

• Total eligible cost: $37,000
• §25D credit: $37,000 × 30% = $11,100
• If you owe $11,100+ in federal tax, you use the full credit this year. If less, the rest carries forward.

Stack with state and utility incentives separately, but watch the basis treatment carefully:

• Utility rebates that are characterized as “purchase price adjustments” (the typical case) DO reduce your §25D credit basis. If the utility rebates $3,000 on a $25,000 solar install, you compute the 30% credit on $22,000, not $25,000.
• State income tax credits generally do NOT reduce the federal basis — they’re separate tax benefits.
• State or non-utility cash rebates: facts and circumstances. IRS Notice 2013-70 (still the controlling authority) treats most subsidies as basis-reducing if they come from a utility or government program for the same equipment.
• HEEHRP rebates: Treasury guidance is still evolving. Conservative treatment: assume basis reduction. Aggressive treatment: argue HEEHRP is income-tested social-program assistance, not a rebate. Talk to a CPA before claiming the credit on the un-reduced cost.

§25C Energy Efficient Home Improvement Credit

The smaller-dollar credit but the one with the most planning leverage. 30% of cost with separate caps per category, resetting every year.

Annual caps (NOT lifetime)

The IRA replaced the old lifetime cap with annual caps. This is huge — you can max out the credit every single year by phasing projects across tax years.

Heat pump bucket: $2,000/yr aggregate for:

• Heat pumps (air-source)
• Heat pump water heaters
• Biomass stoves and boilers (75%+ efficiency)

General improvements bucket: $1,200/yr aggregate, sub-broken into:

• Insulation and air sealing: no separate sub-cap (bounded by the $1,200 bucket; this single category can fill the bucket)
• Exterior windows / skylights: $600 max (TOTAL across all windows, not per window)
• Exterior doors: $250 per door AND $500 max total (the lower of the two governs)
• Home energy audit: $150 max
• Electrical panel upgrade: $600 max (only if upgrade enables another eligible improvement, e.g. a heat pump or EV charger)
• Central AC (high-efficiency split-system, NOT a heat pump): $600 max. Heat pump central AC falls in the $2,000 HEAT PUMP bucket, not here.
• Natural-gas / propane / oil furnaces and boilers (high-efficiency, ENERGY STAR-rated): $600 max
• Natural-gas / propane / oil water heaters (high-efficiency, non-heat-pump): $600 max

TOTAL annual cap: $3,200 ($1,200 general + $2,000 heat pump). This is the maximum any single household can claim from §25C in one year.

Equipment requirements

• Heat pumps: must meet CEE Tier 2 (or higher) efficiency standards
• Windows: ENERGY STAR Most Efficient (the higher tier)
• Doors: ENERGY STAR
• Insulation: meets prescriptive criteria (R-value depending on climate zone)
• Manufacturer’s ID: from 2025 onward, products must include a manufacturer-issued PIN. Save the documentation.

Eligibility

• Primary residence ONLY (no second home, no rentals)
• Must be a U.S. residence that you own and use
• Existing home — new construction generally doesn’t qualify

Worked example

You replace your old gas furnace with a heat pump (installed cost $4,500), add R-49 attic insulation ($1,800), and get a home energy audit ($400) all in the same calendar year.

• Heat pump: $4,500 × 30% = $1,350, capped at $2,000 → $1,350 (under the cap)
• Insulation: $1,800 × 30% = $540, capped at $1,200 → $540 (under the cap)
• Audit: $400 × 30% = $120, capped at $150 → $120 (under the cap)

Total year-1 credit: $2,010.

If you’d also added $2,000 of new ENERGY STAR windows ($600 cap hit), you’d add another $600. Stack patterns matter.

Multi-year stacking strategy

If you have a $10,000 insulation project that would max the bucket and then some, split it across two tax years — do half in December and half in January. That doubles your effective credit.

Same with mixing: heat pump in year 1, windows + insulation in year 2, panel upgrade + new doors in year 3.

§30C Alternative Fuel Vehicle Refueling

The EV charger credit, with a major IRA-introduced restriction.

• 30% of charger cost (equipment + install) up to $1,000 residential
• Geographic restriction: only chargers in low-income census tracts OR non-urban (rural) census tracts qualify

The restriction is the killer. Most suburban driveways are in ineligible census tracts. Check the DOE’s Alternative Fuel Stations eligibility map before spending. Tools like the IRS’s 30C census tract lookup also work.

Worked example

$1,500 Level 2 charger plus install in your garage.

• Eligible census tract: $1,500 × 30% = $450 credit
• Ineligible census tract: $0 — doesn’t matter how efficient or new the equipment is

Hard to swallow if your install is on the wrong side of a tract boundary. Check before you buy.

High-Efficiency Electric Home Rebate Program (HEEHRP)

This is not a tax credit — it’s a state-administered rebate program funded by the IRA. Up to $14,000 per household.

How it works

• Income-tested:
  • Household income ≤ 80% Area Median Income (AMI): up to 100% of project cost rebated, up to caps
  • Household income 80–150% AMI: 50% rebated, up to caps
  • Household income >150% AMI: NOT eligible
• Eligible improvements: heat pumps ($8,000 cap), heat pump water heaters ($1,750), heat pump clothes dryers ($840), electric stoves ($840), electrical panel ($4,000), wiring upgrades ($2,500), insulation / air sealing / ventilation ($1,600). All within the $14,000 total.
• Interaction with §25C: a HEEHRP rebate received generally reduces the cost basis used to compute the §25C credit (you take 30% of the cost AFTER the rebate, not before). You can technically claim both, but the §25C credit gets calculated on the post-rebate amount. Treasury guidance is still being clarified; verify with your installer and CPA.
• State rollout has been uneven: most states began disbursing in late 2024 / 2025. Check your state energy office for current status and waitlists.

If you qualify by income, this is potentially much bigger than the §25C tax credit. The combined HEEHRP + §25C + state utility incentives can cover essentially the full cost of an electrification project.

State and utility rebates

Don’t skip these. Often the difference between “deal” and “no deal.”

• California SGIP (Self-Generation Incentive Program): batteries, particularly generous for low-income, fire-prone-area, and equity customers
• California NEM 3.0: net metering for solar export (less generous than NEM 2.0; affects solar economics significantly)
• Massachusetts MassSave: heat pump rebates up to $10,000 state, plus 0% financing in many cases
• NY Clean Heat / NYSERDA: heat pump rebates and contractor network
• Maine Efficiency: heat pump rebates up to $8,000 for low/ moderate income
• Local utility rebates: most utilities offer heat pump, smart thermostat, and weatherization rebates

The single best resource: DSIRE (Database of State Incentives for Renewables and Efficiency, dsireusa.org). Search by ZIP code; it catalogs state, federal, and utility-level incentives.

Stack them: federal §25D + state rebate + utility rebate + (if qualifying) HEEHRP can routinely double the savings off published sticker prices.

IRS Form 5695

The form for both §25D and §25C. Filed with your Form 1040.

Two parts:

• Part I: Residential Clean Energy Credit (§25D — solar, battery, geothermal, etc.)
• Part II: Energy Efficient Home Improvement Credit (§25C — heat pump, insulation, etc.)

The form:

• Computes current-year credit
• Computes any §25D carryforward to next year
• Requires the Manufacturer’s ID (PIN) for §25C-eligible products from 2025 onward

What to keep for audit

• Manufacturer certification statements (the manufacturer attests the product meets the credit’s efficiency requirements)
• Itemized installer invoices breaking out equipment vs. labor
• Receipts for all materials
• Photos of installed equipment with model numbers visible
• Census tract documentation for §30C

Keep these for at least 3 years past the carryforward exhaustion year. For solar with a multi-year carryforward, that means a long time.

Strategy: how to actually plan

1. Get the energy audit FIRST. $150 credit, plus you get a prioritized list of what improvements actually move the needle on your specific home.
2. Stack everything. Federal §25D/§25C + state rebate + utility rebate + (if income-eligible) HEEHRP. Each stacking decision is program-specific; check terms.
3. Time multi-year projects. §25C resets annually. A $10k insulation project split across two Decembers + Januaries doubles your credit ($1,200 → $2,400).
4. Sequence smartly. If a panel upgrade enables a heat pump install, do the panel and heat pump in the same year so you can claim the panel-enabling credit.
5. Solar payback math: typically 6–9 years post-incentives in sunny states (CA, AZ, NM, TX); 12–15 years in less sunny / less expensive electricity markets.
6. Heat pump payback: highly state-dependent. Wins fastest in the Northeast where you’re displacing oil or propane (often 5–7 year payback). Slower in the South where you’re competing with already-cheap natural gas.

Common mistakes

• Assuming credits apply to rentals. §25D and §25C are personal residence credits. Rental owners need different rules (§48 for commercial).
• Buying used equipment. Not eligible. Must be new.
• Missing the §30C EV charger geographic restriction. A surprising number of suburban installs don’t qualify.
• Not stacking with state and utility rebates. You can leave thousands on the table by only chasing the federal credit.
• Forgetting to file Form 5695. No form, no credit. The installer doesn’t do this for you.
• Front-loading all §25C projects in one year when you’d benefit from spreading across years to use the annual reset.
• Throwing away manufacturer documentation. Without the cert statement and PIN, you can’t prove eligibility in audit.
• Forgetting that §25C is non-refundable with no carryforward. Unlike §25D, the §25C credit is use-it-or-lose-it in the year earned. If you have low tax liability, do §25D first.

TCJA / IRA sunset and modification risk

• §25D: scheduled 30% through 2032, 26% in 2033, 22% in 2034, expires after.
• §25C: annual caps in current form through 2032, then expires.
• §30C: through 2032.
• HEEHRP: funding through 2031 (or until disbursed).

These are subject to legislative change. The IRA-era credit structure could be modified or repealed by future Congresses. Verify current status before committing to a six-figure install schedule. As of April 2026 the credits remain in force as written above.

When to consult a CPA

• Complex stacking with rental property holdings (some structures can use §48 commercial credit)
• Carryforward optimization across multiple high-cost installs — e.g., spreading a large solar + battery install to maximize use given low current tax liability
• High income limiting credit utilization (the credits are useless if you have minimal tax liability and no carryforward room)
• Mixed-use property (home office, rented portion) — allocation rules
• HEEHRP rebate interaction with §25C basis (still evolving guidance)

Tools you’ll use

• Energy Tax Credits calculator — model your specific install across §25D, §25C, and state rebates
• Mortgage Calculator — if financing the install via a HELOC or cash-out refi (note: HELOC interest deductibility depends on substantial improvement — see mortgage interest deduction guide)

Related reading: property tax basics, mortgage interest deduction, homeowners insurance, escrow accounts.