Documentation13 min read
What Should an Audit-Ready 179D File Contain?
A claim-to-evidence framework for building identity, engineering, cost, allocation, labor, and return records.
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Turn Energy-Efficient Projects Into Tax Incentives.
NABiTax helps building owners, designers, and organizations identify, document, and maximize federal energy tax incentives.
179D • Cost Segregation • ITC • Direct Pay
Who are you?
Choose your role to see the incentives that may apply to your project.
Commercial Building Owner
You may be eligible for Section 179D
Section 179D can provide a federal tax deduction for qualifying energy-efficient improvements to commercial buildings.
Eligibility and deduction amounts depend on the project, applicable tax year, building characteristics, and IRS requirements.
Potential qualifying areas include:
- HVAC
- Interior Lighting
- Building Envelope
- New Construction
- Major Renovations
Also available to owners
Cost Segregation
A cost segregation study reclassifies components of a building into shorter depreciation lives, which may accelerate depreciation deductions for qualifying owners.
It is generally considered for owners who purchased, built, or renovated a property and hold it in a taxable entity that can use the resulting depreciation.
Results depend on the property, placed-in-service date, ownership structure, and applicable IRS rules.
Potential qualifying areas include:
- Newly purchased or constructed buildings
- Renovations, expansions, and tenant improvements
- Interior finishes and specialty electrical
- Site work, landscaping, and parking areas
- Energy-efficient residential and dwelling-unit projects
Identify. Analyze. Confirm Benefit. Engagement.
From initial eligibility to final documentation, we help turn complex energy tax incentives into a clear process.
Identify
Find qualifying projects and the federal energy incentives that may apply.
Analyze
Evaluate the building, systems, project scope, and applicable requirements.
Confirm Benefit
Confirm the incentive can actually be used by the entity before moving forward.
Engagement
Engage with NABiTax for the study, certification, and delivery package.
Federal Energy Incentives
Explore All Incentives179D
Energy-efficient commercial buildings and qualifying designers.
Cost Segregation
Energy-efficient residential and dwelling-unit projects.
ITC
Investment tax credits for qualifying clean-energy projects.
Direct Pay
Elective Pay opportunities for qualifying tax-exempt and governmental entities.
Technical Expertise. Clear Process.
Energy + Tax Incentive Expertise
We combine building energy analysis with knowledge of federal energy incentives.
Practical Documentation
We focus on producing clear, defensible documentation for each project.
Built Around Your Project
Different buildings, entities, and technologies require different approaches.
Straightforward Process
No unnecessary complexity. We make the process easy to understand from start to finish.
Insights
Practical perspective for better planning.
Timely analysis of federal energy incentives, technical requirements, and project documentation.
View all news Tax Reporting12 min read
What Is Form 7205?
How Form 7205 organizes a supported claim—and why the underlying file must explain every reported number.
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Deduction Analysis12 min read
Base 179D vs. Increased 179D: A 100,000-Square-Foot Example
One hypothetical building shows how certified savings, published 2026 rates, PWA, cost, and prior claims interact.
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Labor Compliance16 min read
The 179D 5x Opportunity: Prevailing Wage and Apprenticeship Explained
A practical guide to the increased path, installation-start exception, wage records, apprenticeship tests, and correction rules.
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Technical Certification12 min read
Energy Model vs. Field Inspection: Why Does 179D Need Both?
Why calculations and observed installed conditions support different parts of an ordinary-route certification.
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Energy Performance12 min read
Why 25% Energy Savings Matters for Section 179D
The ordinary-route threshold and 2026 rate curves, explained without confusing modeled energy cost with utility savings.
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Reference Standards16 min read
ASHRAE 90.1 and 179D: Which Reference Standard Applies?
A date-based framework for the 2007, 2019, and 2022 federal tax baselines, including the pre-2023-start rule.
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Energy Modeling13 min read
How Does 179D Energy Modeling Actually Work?
Inside the proposed-building and reference-building comparison, covered annual costs, field reconciliation, and certification.
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Tax Coordination12 min read
179D vs. Cost Segregation: How Are They Different?
Why energy qualification and asset classification answer different questions while sharing selected building records.
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Deduction Analysis13 min read
How Much Could Your Building's 179D Deduction Be Worth?
How building area, certified savings, 2026 rates, eligible cost, and prior deductions shape a preliminary estimate.
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Existing Buildings14 min read
179D Is Not Just for New Buildings: Understanding the Retrofit Opportunity
How the alternative retrofit route uses measured energy-use intensity, a qualified plan, and a different certification clock.
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Project Pathways11 min read
New Construction vs. Renovation: Where Does Section 179D Apply?
Why building age, installed-property dates, and the selected technical pathway answer different questions.
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Building Systems10 min read
Building Envelope Improvements and 179D
How thermal assemblies, glazing, air leakage, modeling, and field evidence enter a whole-building 179D review.
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Building Systems10 min read
LED Lighting Upgrades and Section 179D
Why fixture wattage reductions are not the same as the current whole-building energy-cost test.
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Building Systems10 min read
HVAC Replacement and 179D: What Commercial Building Owners Should Know
How equipment, controls, schedules, and installed conditions affect a modeled 179D result.
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Owner Guidance11 min read
Does Your Commercial Building Qualify for Section 179D?
A practical review of ownership, systems, dates, modeling, certification, cost, and prior-deduction gates.
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Designer Workflow12 min read
From Design Contract to Tax Deduction: The Complete 179D Designer Journey
A coordinated path from technical authorship and project records through certification, allocation, Form 7205, and filing.
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Design Responsibility10 min read
Why Your Job Title Does Not Determine Whether You Are a 179D Designer
Why authored technical decisions—not a title, license, installation work, or project hierarchy—drive the designer review.
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Portfolio Screening12 min read
The 179D Project Audit Every Architecture and Engineering Firm Should Perform
A repeatable internal inventory that separates evidence-ready projects from solvable gaps and unsupported leads.
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Owner Verification11 min read
You Designed a School, Hospital, University or Nonprofit Building: Could 179D Apply?
Why the legal owner—not the building name, occupant, or public-facing mission—controls the allocation inquiry.
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Allocation Strategy10 min read
Can Multiple Designers Share a 179D Deduction?
How an owner-approved division and one reconciliation ledger can support multiple designers without duplicating the building deduction.
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Design Responsibility9 min read
Architect vs. Engineer vs. Contractor: Who Gets the 179D Allocation?
Why technical authorship—not project hierarchy or professional title—drives the designer responsibility review.
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Allocation Documentation10 min read
What Is a 179D Allocation Letter and Why Does a Designer Need One?
What the written allocation accomplishes, which information supports it, and how it connects to Form 7205.
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179D Planning15 min read
179D After the Sunset: Why Designers May Still Claim in Later Years
Why June 30, 2026 is a construction-start cutoff—not necessarily the final date for a potential Section 179D deduction.
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Designer Guidance12 min read
You Designed It: Can You Claim the 179D Deduction?
How architects, engineers, design-build contractors, and energy-service providers may qualify for an allocated Section 179D deduction.
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Legislative Update6 min read
H.R. 8477 Could Restore a Longer Future for Section 179D
What the proposal would change, what current law still requires, and how project teams can prepare documentation now.
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Have an Energy-Efficient Project?
Let's determine which federal incentives may be available to you.