What Is the Federal IRA 25C Tax Credit? MA Homeowner Guide.

IRA 25C Defined

Section 25C of the Internal Revenue Code (Energy Efficient Home Improvement Credit), substantially revised by the 2022 Inflation Reduction Act, provides a federal income tax credit for qualifying residential energy efficiency improvements placed in service in the tax year. Replaced the prior 25C credit (which had a $500 lifetime cap) with a substantially expanded version: 30% of cost with annual caps and authorization through 2032.

Distinguishes from related credits:

• 25C: efficiency upgrades (envelope, heat pump, HPWH, induction range, panel) — annual caps
• 25D: clean energy (solar PV, geothermal, battery) — 30% with NO cap
• 30C: alternative fuel vehicle refueling property (EV charger) — 30% up to $1,000 residential

Qualifying Products

Comprehensive list with annual caps:

Building Envelope ($1,200/year cap)

• Insulation: 30% of cost. Most insulation Energy Star certified.
• Air sealing: 30% of cost. Bundled with insulation typically.
• Windows: 30% up to $600/year sub-cap. Energy Star certified.
• Exterior doors: 30% up to $250 each, $500/year sub-cap.
• Home energy audits: 30% up to $150 sub-cap. (Mass Save HEA is free, so this rarely matters.)

Heat Pumps + HPWH ($2,000/year cap)

• Air-source heat pumps: 30% of cost up to $2,000.
• Heat pump water heaters: 30% of cost up to $2,000 (combined cap with main heat pump if both same year).
• Geothermal heat pumps: claim under 25D (no cap), not 25C.
• Biomass stoves and boilers: 30% up to $2,000.

Other ($600/year cap)

• Electrical panel upgrades: 30% up to $600 IF needed to enable above electrification.

Stacking with Mass Save

Critical: 25C and Mass Save rebates stack independently. Both apply to the same project. Calculate Mass Save first; remaining cost basis is what 25C applies to.

Worked example for $22,000 heat pump install:

• Heat pump install: $22,000
• Mass Save standard rebate: -$10,000
• Cost basis after Mass Save: $12,000
• 25C credit: 30% × $12,000 = $3,600 — capped at $2,000
• 25C credit applied: $2,000
• Net cost: $22,000 - $10,000 - $2,000 = $10,000

Spread across tax years: install heat pump in Year 1 ($2,000 credit), HPWH in Year 2 ($2,000 credit) — captures $4,000 total vs $2,000 if both same year.

How to Claim via IRS Form 5695

3-step claim process:

1. Save receipts: contractor invoice showing equipment + install cost. Manufacturer Energy Star certification documentation.
2. Calculate eligible costs: subtract Mass Save rebate received from total cost. Apply 30% × remaining cost basis. Cap at the applicable annual cap.
3. File IRS Form 5695 with your annual tax return. Form 5695 is downloadable at irs.gov. Most tax software handles 25C automatically when you enter the costs.

Pro Build provides Mass Save filing receipts AND 25C-compatible invoice documentation on every project.