Energy Audit Tax Credit: What It Covers and How to Qualify

The federal Energy Efficient Home Improvement Credit (Section 25C) includes a component for home energy audits, but the amount and eligibility rules have conditions worth understanding before you assume a specific dollar outcome. This is general information, not tax advice — always confirm the current year's rules with the IRS or a tax professional before filing.

What the Credit Covers

Section 25C is a federal tax credit that has historically allowed homeowners to claim 30% of the cost of a qualifying home energy audit, up to a $150 cap, as one part of a broader credit for home efficiency improvements. The audit component is separate from — and smaller than — the credits available for things like insulation, windows, heat pumps, or electrical panel upgrades, which fall under the same law but have their own limits.

Because tax law changes and the IRS periodically updates guidance, do not rely on this article (or any other website) for the exact percentage, cap, or expiration date that applies to your filing year. Go directly to IRS guidance on energy efficient home improvements before you file, or ask a tax preparer to confirm what applies to your specific return.

Requirements That Commonly Apply

Historically, claiming the audit portion of the credit has required meeting conditions along these lines — but verify current specifics with the IRS, since requirements are subject to change:

• The audit must be conducted and documented by a qualified home energy auditor. A casual walkthrough or a DIY checklist typically does not qualify — the law has generally required a written report from a credentialed professional.
• The audit report must meet certain content standards, such as identifying the most significant energy efficiency improvements for the home, with estimated savings, and including certification language from the auditor.
• You generally need to keep the audit report and receipt as documentation in case of an IRS inquiry.
• The credit applies to your primary residence in most cases, with specific rules around rentals and second homes.

The DOE's home energy assessment guidance explains what a professional home energy audit typically includes — blower door testing, combustion safety checks, insulation and air sealing evaluation — which is useful context for understanding what "qualifying" work looks like, separate from the tax rules themselves.

Why "Qualified" Matters

The credit's audit provision is tied to using a qualified home energy auditor, which is a narrower category than "anyone who inspects your home." Two credentialing paths are widely recognized in the industry:

• BPI (Building Performance Institute) certification — BPI-certified professionals are trained in whole-house diagnostic testing and energy auditing standards. You can search a directory through the BPI contractor locator.
• RESNET HERS ratings — HERS raters are certified to produce a Home Energy Rating and often perform detailed energy audits as part of their scope. You can search a directory through the RESNET HERS rater directory.

Whether a specific certification satisfies the IRS's "qualified auditor" definition for a given tax year is a detail that can change, so this is another point to confirm with current IRS guidance rather than assuming.

What an Audit Typically Costs

A professional home energy audit commonly runs from a few hundred dollars up to $600 or more, depending on:

• Home size — larger homes take longer to test and inspect.
• Scope — a basic walkthrough audit costs less than a comprehensive audit with blower door testing, duct leakage testing, and combustion safety analysis.
• Local market rates — labor costs vary by region.
• Whether a utility rebate or program subsidizes part of the cost — some utilities offer discounted or free audits, which can also affect what you're eligible to claim.

Since the tax credit caps the audit portion, in many cases it will offset only part of the total cost, not all of it. Don't plan your budget around a specific dollar credit amount until you've confirmed the current-year cap and percentage with the IRS.

How to Choose and Verify a Qualified Auditor

Before booking an audit — especially if you intend to claim a tax credit for it — verify the auditor's credentials directly rather than taking a website's word for it:

1. Check BPI or RESNET credentials directly through the BPI locator or RESNET HERS rater directory — confirm the individual's certification is active, not just that a company employs certified staff.
2. Ask for a sample audit report so you understand what documentation you'll receive and whether it appears to meet the content requirements described in current IRS guidance.
3. Confirm licensing and insurance appropriate to your state, in addition to certification.
4. Get the audit cost in writing before scheduling, along with a written report at completion — you'll want both for your tax records.
5. Cross-check the current tax year's rules on irs.gov before assuming any specific dollar credit — the audit component, cap, and requirements are all subject to legislative change.

This site is an independent directory built from public, source-backed records. It does not certify, endorse, or vet home energy professionals — always verify credentials directly with BPI, RESNET, or the relevant credentialing body, and verify tax rules directly with the IRS.

Is a home energy audit tax deductible?

The federal provision is a tax credit, not a deduction — it reduces your tax liability rather than your taxable income, subject to the cap and requirements described above. Confirm current details with the IRS or a tax professional.

Do I need a HERS rating or BPI certification specifically to qualify?

The IRS's "qualified home energy auditor" definition has specific criteria that may reference recognized certification programs. Rather than assuming either credential automatically qualifies, confirm directly with current IRS guidance or ask the auditor how their certification aligns with the requirement.

Can I claim the credit for a DIY energy assessment?

Historically, the credit has required a written report from a qualified professional auditor, not a self-conducted assessment. Confirm current requirements before assuming a DIY check qualifies.