EPAct 179D tax deduction support: independent PE certification and lookback documentation when records support evaluation. For manufacturers, building teams, and design partners working with tax counsel. Your CPA files the return—start with the free eligibility checklist for a go/no-go screen.
Facility owners, plant and facility engineers, design partners, and CFOs working with tax counsel on EPAct 179D eligibility and PE certification—not a tax-preparation product.
Includes
Eligibility screening based on available records and statute
Engineering modeling support where required
Documentation package for CPA or tax counsel
Notes on loads or inefficiencies observed during lookback (when present)
Not included
Tax preparation or filing
Guaranteed credit amounts
Full energy audit or ECM ranking unless scoped separately
How we think about this work
Section 179D (EPAct) is an energy-efficient commercial buildings tax deduction, not a PE productized tax service. When records and statute align, a 179D lookback builds an engineering picture of installed efficiency systems (HVAC, lighting, and envelope) against a reference baseline. That inventory and model work often surfaces under-documented loads—useful reconnaissance, not a substitute for a full industrial energy audit when capital decisions need ranked ECMs. SIEC provides PE engineering and certification documentation. Your CPA files the return.
Related services
Start with the constraint that is costing you most. These paths share measurement and uptime rules.
Conditions that drive calls from plant, EHS, and capital teams.
Lookback candidates
Past HVAC, lighting, or envelope work that may support evaluation.
Counsel needs models
Tax counsel needs engineering support alongside their opinion.
Efficiency signal from lookback
Site and model work reveals loads or gaps that may warrant a deeper energy path.
How the work runs
Each step ends with a decision gate before capital or install moves forward.
01
Phase 1 — No-cost eligibility review
Facility basics: square footage, systems upgraded, placed-in-service era, approximate cost, available documents, and PWA status for 2023+ work. Order-of-magnitude range and go/no-go. Typically 1–5 business days once complete information is received.
Gate · Gate: go / no-go before any certification engagement
02
Phase 2 — PE certification package
Modeling or measurement pathway as records support, site verification as required, IRS-aligned documentation for your tax advisor. Typically 2–3 weeks after engagement and receipt of supporting documentation.
Gate · Gate: package ready for tax advisor
03
Coordinate with tax counsel
Clear boundary: engineering certification versus tax opinion. Your CPA applies the deduction on the return.
Gate · Gate: counsel owns tax conclusions
FAQ
Questions we get
Do you file the tax return?
No. Your CPA files. We provide engineering support within our scope.
Is a 179D lookback the same as an energy audit?
No. Lookback work is built for eligibility documentation and PE modeling. It can still reveal loads and inefficiencies. A full energy audit ranks ECMs with uptime and ROI explicit when that is the decision you need.
Who is this for?
Plant and facility engineers, owner's engineers, design partners, and finance teams already working with tax counsel.
What records matter first?
What was installed, when, drawings or invoices if available, and building use. Weak records often stop eligibility screening early.
Can 179D replace a ventilation or capital project?
No. Capture, process, and capital engineering stay separate scopes. Lookback findings may inform those conversations when loads or systems show up in the model.
Do you guarantee a credit amount?
No. Outcomes depend on statute, rates, and documentation quality. Tax conclusions stay with counsel and your CPA.
Start a conversation
For: Plant and facility engineers, design partners, and finance teams working with tax counsel on EPAct 179D eligibility and PE certification.
What helps a first conversation
Facility type and building use
State / jurisdiction
Whether a CPA or tax counsel is already engaged
Install records or prior energy model notes if available
EPAct 179D PE certification when records support evaluation. Tax filing stays with your CPA. Not a tax product.
