Getting Paid to Make the House Cheaper to Run
Energy work on a home is one of the few large expenses that comes with a credit against tax rather than a deduction — a dollar of credit is a dollar off the bill. Two separate credits apply, with different rules, different caps and different lists of qualifying work. Knowing which one covers a project changes both the timing and the size of the benefit.
- A credit, not a deduction:: It reduces tax directly rather than reducing taxable income.
- Efficiency work has annual caps:: Per-item and overall annual limits apply, and they reset each year.
- Clean energy is a percentage:: Solar, geothermal and storage attract a percentage of the qualifying cost.
- Both go on one form:: Form 5695 carries both credits through to the return.
Where the AI summary above gets this wrong
"You can claim a tax deduction for making your home more energy efficient."
That's surface-true. Here's what it misses:
- These are credits, which are worth considerably more — A deduction reduces taxable income; a credit reduces the tax itself. For a retired household in a modest bracket the difference is large — a deduction might be worth twelve cents on the dollar where the credit is worth the full amount up to its cap.
- The efficiency caps reset every year — The credit for insulation, windows, doors and heat pumps carries both per-item limits and an overall annual limit. Splitting a large project across two calendar years can therefore claim the cap twice, which is a scheduling decision made before the contractor starts rather than after.
- One credit can be carried forward and the other generally cannot — The clean energy credit for solar and storage can generally be carried to a later year where it exceeds the tax due, which matters for a retired household with a small tax bill. The efficiency credit is not carried forward, so spending beyond the year's tax liability simply wastes it.
01 The efficiency credit
This one covers the unglamorous work: insulation and air sealing, exterior doors and windows, central air conditioners, water heaters, furnaces and boilers, heat pumps and biomass stoves, and a home energy audit.
It is subject to per-item limits and an overall annual limit, both of which reset each calendar year. Equipment must meet stated efficiency standards, and for some items the manufacturer must supply a product identification number.
Because the caps reset annually, a whole-house project is frequently worth splitting across a December and a January rather than running straight through. That single piece of scheduling can double the credit claimed on the same work.
Shows: the credit on a qualifying project at the percentage you enter, and the net cost after it. Ignores: the annual and per-item caps that apply to the efficiency credit, whether the credit can be carried forward, state and utility rebates, and whether the property qualifies.
02 The clean energy credit
This one covers generation and storage: solar panels, solar water heating, wind, geothermal heat pumps, fuel cells and battery storage. It is calculated as a percentage of the qualifying cost, including labour and installation.
There is no overall dollar cap in the way the efficiency credit has one, which is why a large installation produces a large credit. Where the credit exceeds the tax due it can generally be carried forward.
That carry-forward is what makes the credit usable for a retired household whose annual tax bill is small. It also interacts with a conversion, since a year with deliberately higher income has more tax for the credit to offset.
Source: Residential clean energy credit
03 Claiming it
Both credits are computed on Form 5695 and carried to the return. The form separates them, because the caps, the carry-forward treatment and the qualifying lists are different.
Keep the invoices, the manufacturer certifications and any product identification numbers. The credit is claimed by the homeowner, so the paperwork has to be in the household file rather than only with the contractor.
Utility and state rebates generally reduce the cost the credit is computed on, so the order in which those are applied changes the answer. Where a rebate is large, that reduction is worth calculating before committing.
04 Whether the work is worth doing anyway
A credit improves the return on the work; it does not by itself make a project sensible. The comparison is the net cost after the credit against the annual saving on the energy bill and the effect on the house's value.
For a household planning to stay put for a long retirement, a lower running cost every year is worth more than the same money invested at a modest return, because the saving is certain and untaxed.
For a household likely to move within a few years, the credit is still claimed but the running-cost saving mostly accrues to the buyer, which turns the decision into the same stay-or-move question every other housing choice runs into.
Ask the contractor to split the job across the new year. The efficiency credit's caps reset on 1 January, so windows in December and insulation in February claims the annual limit twice on work that would otherwise have claimed it once. Contractors will usually do it if you ask before scheduling and will not think of it themselves, because it is your tax return and not theirs.
FAQ
Is home energy work a deduction or a credit?
A credit. It reduces the tax owed directly rather than reducing taxable income, which makes it worth considerably more than a deduction of the same size.
Can I claim the credit two years running?
The efficiency credit's caps reset each calendar year, so splitting a large project across two years can claim it twice. The clean energy credit is a percentage of cost with no equivalent annual cap.
What if my tax bill is smaller than the credit?
The clean energy credit can generally be carried forward to a later year. The efficiency credit is not carried forward, so it is limited to the tax due that year.
Sources
Regulator references
- Energy efficient home improvement credit · Internal Revenue Service · 2026The credit for insulation, windows, doors, heat pumps and audits.Last verified: 2026-09-07
- Residential clean energy credit · Internal Revenue Service · 2026The credit for solar, wind, geothermal and battery storage.Last verified: 2026-09-07
- About Form 5695: Residential energy credits · Internal Revenue Service · 2026The form both credits are claimed on.Last verified: 2026-09-07
Calculator unit tests · the assertions this page's worked example is checked against, and their last result
Changelog
- 2026-09-07 — initial publish (new format)
Run this rule against your situation
See what this rule does to your own projection — month by month, to age 90.
Join the Waitlist
Jordan Reeves
Founder of Talk Through Wealth. A software engineer for over a decade before turning to retirement planning, Jordan built the projection engine after watching family members get fragmented, country-by-country advice that never reconciled. He writes about retirement the way the engine computes it: month-by-month, lifetime-long, and skeptical of any rule of thumb that hasn't been run through the math.